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Showing posts with label Environmental Geography. Show all posts
Showing posts with label Environmental Geography. Show all posts

Wednesday, February 19, 2014

California's Central Valley Drought: A Slow Moving Disaster Both Farmers and Conservationists Tried to Warn About (For Different Reasons) - Part 1

California's Central Valley is one of the world's most productive farmlands.  Eventhough it comprises less than one percent of America's agricultural farmland, it produces more than eight percent of all American agricultural output.  While that may sound small, if something bad were to happen in the valley American consumers would feel it in their pocket books. Sadly something bad is happening to the valley and its impact is coming.

There is a massive drought that is killing crops, running harvests, and destroying people's livelihoods.

The drought from space.  Click to enlarge.  From National Journal
Some people are blaming the poorly understood, even more poorly used catch-all "global warming" to explain what is happening.  The truth is more complex and much more tragic.  For different reasons both farmers and conservationists have warned about what was going to happen but only now are people noticing.  The drought and the valley are monuments, in both the good and bad sense, to man.

Working backwards from recent follies to first decisions, today's environmentalist movement has major blame in the drought.  The valley has a complex water infrastructure system dating back to the 1960s designed to withstand years of drought while keeping farming production at optimum levels.  However, since the 1990s and 2000s, environmentalists in government and judges have ordered water meant for the agricultural system be diverted to projects like keeping endangered species protected.

In 2009 farmers, conservatives, and even environmentalist-friendly Governor Arnold Schwarzenegger tried to warn that current policies were setting up the valley for failure.  The show, The Valley Hope Forgot, seemed conservative-alarmist in 2009 but seems prophetic now.











While farmers and conservatives do point out the recent causes of the drought, they ignore the longer term "ticking clock" that conservationists have been warning about for even longer.

Next post:  Part 2 - The Conservationists' Warning

Monday, January 06, 2014

2013 Second-Quietest Tornado Year since 2000

The Examiner has a blog post discussing the latest confusion in climate change: the lack of extreme weather.  2012 had extreme temperatures but 2013's weather moderated and there was a decline in extreme events like tornadoes.  The key take-away:

The problem is that 2013 is proving to be among the years with the fewest number of tornados on record, according to data compiled by the National Oceanic and Atmospheric Administration's Storm Prediction Center in Norman, Okla.  
There have been 940 tornadoes in the U.S. between Jan. 1 and Dec. 23. Since 2000, the only year with fewer tornados was 2002, with 938. The year with the highest number of tornados was 2011, with 1,894. There were 1,119 in 2012.  
 The May 20 tornado that destroyed much of Moore, Okla., was an EF5, according to NOAA, with winds around 300 mph. That's the deadliest kind of tornado. The Moore EF5 was the only one of its strength level anywhere in the U.S. in 2013. 
There were six EF5s in 2011, seven in 1974 and five in 1953, the first year for which NOAA has such records.
This just goes further to prove that climatology is a very hard science to master.

Tuesday, November 12, 2013

Poor Infrastructure Adds to Typhoon Haiyan Diaster, Political Geography Makes it Even Worse


Slate has a breakdown of why such horrible disasters in the Philippines are made worse by human issues.  Despite recent economic gains the Philippines suffers from poor infrastructure and many poor people forced to live in areas that are easily flooded, eroded, or at risk of earthquakes.  Because of the poor living conditions, the Philippines leads the world in disaster fatalities.

Meanwhile TDAXP pointed out that political tensions with China over rocks in the middle of the South China Sea has destroyed the feeling of sympathy Chinese may have for Filipinos and Chinese tourists in the Philippines.  A blog post about Chinese tourists stuck in the disaster area has lead many Chinese commentators on the ChinaSmack blog to call these tourists 'traitors" who deserve whatever happens to them.  I do not expect China to offer any aid to the Philippines because of their on-going dispute.  

Friday, September 13, 2013

Fall Foliage Map 2013


Stormfax has a great webpage and map of fall foliage color changes.  They also link to various states' tourism offices that handle foliage tourists.

Mid-Atlantic Region:
 PENNSYLVANIA  Fall Foliage/Events Hotline  1-800-FALL-INPA
 NEW JERSEY  Fall Foliage/Events  1-800-VISIT-NJ
 DELAWARE | (alt) Fall Foliage/Events  1-800-441-8846
 MARYLAND | (alt) Fall Foliage/Events  1-800-LEAVES-1
 VIRGINIA | (alt) Fall Foliage/Events  1-800-434-LEAF
 WEST VIRGINIA Fall Foliage/Events  1-800-CALL-WVA
 NORTH CAROLINA Fall Foliage/Events  1-800-VISIT-NC

New England Region:
 CONNECTICUT Fall Vacation Hotline  1-800-CT-BOUND
 MAINE Publicity Hotline  1-800-533-9595 or 1-888-MAINE-45
 MASSACHUSETTS | (alt) Fall Foliage Hotline  1-800-227-MASS (6277)
 NEW HAMPSHIRE | (alt) Fall Color Hotline  1-800-262-6660 or 1-800-258-3608
 NEW YORK | (alt) Fall Foliage Hotline  1-800-225-5697 or 1-800-CALL-NYS
 RHODE ISLAND | (alt) Fall Vacation Hotline  1-800-556-2484
 VERMONT | (alt) Fall Foliage Hotline  1-800-VERMONT or 1-800-828-3239

Midwest, West & South:

 ARKANSAS | (alt)  Fall Foliage  1-800-NATURAL
 CALIFORNIA | (alt)  Fall Foliage  1-800-354-4595
 COLORADO | (alt) Travel/Events Hotline  1-800-COLORADO
 GEORGIA Travel/Events Hotline  1-800-864-7275
 ILLINOIS | (alt) Travel/Events Hotline  1-800-2CONNECT
 INDIANA | (alt) Travel/Events Hotline  1-888-ENJOY-IN
 KENTUCKY Color Connection  1-800-225-8747
 MICHIGAN Foliage Hotline  1-800-644-3255
 MINNESOTA Foliage Hotline  1-800-657-3700
 MISSOURI Fall Report  1-800-NATURAL
 MONTANA | (alt) Travel/Events Hotline  1-800-847-4868
 OHIO Foliage & Travel Hotline  1-800-282-5393
 OREGON | (alt) Foliage Hotline  1-800-547-5445
 TENNESSEE Fall Color Hotline  1-800-697-4200
 TEXAS | (alt) State Park Hotline  1-800-792-1112
 WASHINGTON State Foliage Information  1-800-354-4595
 WISCONSIN Foliage Hotline  1-800-432-TRIP
 WYOMING | (alt) Travel Hotline  1-800-225-5996

Tuesday, September 10, 2013

Arctic Ocean Ice Cover Grows by 60% Compared to 2012, Still on Downward Trend

Climate science and politics has become a race to stupidity by both sides.  The loudest voices of doom dominate the environmentalists while the absolute deniers are the loudest voice on the skeptics side.

Today's example is Arctic Ocean ice cover growing by sixty percent compared to 2012.  Great news on the surface.  It certainly proves false doom sayers who claimed the Arctic Ocean would be ice free in 2013.

From Daily Mail
However, the Guardian (who has played fast and loose with climate science before but not this time) points out that this sixty percent still is part of an overall decline.

From The Guardian

Now there is an overall "pause" (or if you see it as a "cessation") in global warming that was not foreseen in modelling.  It remains to be seen whether or not this large growth in sea ice actually means something or is merely a short-term bounce.  While it cannot be simply dismissed it is foolish to declare the problem over.  Scientist will be trying to figure out exactly what and why is going for a long time.

Monday, August 26, 2013

Ten Myths (Eight Geographical) About Fracking

Pro-fracking activist, journalist, and filmmaker Phelim McAleer has created a list of the top ten myths about fracking.  Two of these myths are more about McAleer's disagreements with anti-fracking activists but the remaining eight are of an environmental-geographical nature.

Three of the myths I like to point out are

  • Fracking makes your water flammable - Flammable water in the region is due to natural causes and has been reported for over 100 years.
  • Fracking is new - Fracking has been around since 1947
  • Fracking in earthquakes - Fracking has indeed been tied to earthquakes, but less so than "green" geothermal energy and hydro-energy.

One of the biggest issues I have with the environmentalist establishment is how they always focus on the worse case scenario even when it is not warranted.  Anti-fracking environmentalists fall into this trap by using the movie Gasland to spread falsehoods that can be dismissed to the point rational people will doubt any possible problem caused by fracking.

Thursday, August 15, 2013

Heavy Water Consumption in Lower Ogallala Aquifer Heaviest in Dust Bowl Area

I love the Interior Plains of the United States.  I feel at home in the wide open land where the tall grass blows in the wind.  The way of life, the unique mix of cultures overlooked by those whose multiculturalism ends at the urban Ethiopian restaurant, and most of all the people make the area exceptionally rich.  Because of this love I have vehemently defended the region from those who view it as "backwards" or little more than flyover country.

However, the people in the southern Interior Plains nearly destroyed it by employing foreign (i.e. non-local) farming practices which resulted in the Dust Bowl of the 1930s. The Dust Bowl ended because 1) many farmers who were doing harmful agricultural practices left the region which allowed 2) the grassland to grow back and 3) the use of the Ogallala Aquifer to support agriculture.

The third point has allowed agriculture, both family and industrial, to expand in the southern Interior Plains.  However, the overuse of the aquifer risks another agricultural failure which when combined with a drought poses the risk of another Dust Bowl.  Take a look at the map of where the Dust Bowl was and where the worst depletion of the aquifer is.  This is a cause for worry in the long term.

Map from Dust Bowl Odyssey.
This Stratfor map (click to enlarge) shows the greatest depletion in the worst place possible.

Tuesday, June 25, 2013

Map of the Flow Size of United States Rivers

The Pacific Institute made the below map showing the size of American rivers' flow in cubic feet per second.  Two things are clear: a) yet again the great river dividing America really should be considered the Mississippi because of both length and flow and b) the Columbia River gets too little respect for its might.

Click to enlarge.

Thursday, June 20, 2013

Major Cities Ice Depth During the Ice Age

Internet cartoon and geography fan XKCD made a diagram showing how thick the ice sheet was over the spot of the city 21,000 years ago.



The depths are

  • Boston 4,100 feet (1250 meters)
  • Chicago 2,950 feet (900 meters)
  • Montreal 10,170 feet (1.9 miles! or 3,100 meters)
  • Toronto: 6,890 feet (2,100 meters)


My home region was once under over a mile of ice.  To think this and the radical changes between then and now are 100 percent natural.  Nature is violent and climate change can be world altering.

Tuesday, June 18, 2013

Scientists Continue to Discover Negative Side Effects of Human Consumption of Drugs in Wildlife

A year ago I was privileged enough to go on a private group tour of a waste water treatment plant for a significant American city.  After being showed facility after facility of filters I asked what the biggest problem was that still remained in the processed water.  I got a surprisingly intense answer: "Pills!  People dump their medicine down the toilet not knowing that it hurts the fish!  Even the pills people take hurts the fish!  Birth control medicine comes out of people's pee and no filter can take care of that.  Goes straight back into the water and into fish.  Now alot of poor fish are all screwed up and can't have kids of their own!"  The person was not joking.  He was very concerned for the fish and the environment he loved.  I felt the person pain as well because of my similar appreciation of the aquatic life and my stance as a fisherman/fish conservationist.

Now a new study shows a new disturbing side effect of human consumption of drugs in wildlife.  A new study by scientists at the University of Wisconsin-Milwaukee found that male fathead minnows became altered behaviorally after exposure to Zoloft and Prozac.  In some cases the minnows became super aggressive and killed female minnows.

Studying human-environment interaction is incredibly difficult.  There are just so many interrelationships we have no clue about.  In the case of medicine and negative side effects in wildlife we need to reevaluate the types of drugs and the amount consumption of said drugs at societal and individual levels if we desire to be better stewards of the environment.

Wednesday, May 22, 2013

Maps of Moore Oklahoma Tornado

Pray for Moore, Oklahoma.  The Knights of Columbus and the American Red Cross are accepting donations for disaster relief.

The National Weather Service created the below map showing the range and strength of the Moore, Oklahoma tornado.  For reference the Enhanced Fujita scale is EF 0 equals 65-85 miles per hour (104-137 kilometers per hour), EF 2 equals  111-135 mi/h (178-217 km/h), EF 4 equals 166-200 mi/h (267-322 km/h).

Click to Enlarge

The BBC has a large scale map showing the path of the tornado inside the town of Moore.  Two of the three schools suffered pretty much direct hits.

Click to Enlarge
The National Weather Service has another map comparing the path of the 2013 Moore tornado with the 1999 Moore tornado.

Click to enlarge

Finally NASA released a video of the storm's growth.




Wednesday, April 17, 2013

Virtual Geography Convention 2013: Measuring and Marketing Ecosystem Services, Functions, and Values in Oregon

Welcome to the Virtual Geography Convention 2013!

Eric Nost of the University of Kentucky shared his AAG presentation Measuring and Marketing Ecosystem Services, Functions, and Values in Oregon on his blog.  His slides and notes are below.  Be sure to check out his website for more insight to his work.

"I've linked to my presentation from the Blue/Green Economies session at the recent Association of American Geographers meeting in LA. The text of the talk is below and each paragraph corresponds to a slide. It's about how regulators, conservationists, and entrepreneurs in an ecosystem services market in Oregon are assessing the landscape ecological aspects of restoration sites. Similar to my talk on "Code/Nature," I argue that state environmental agencies like the Oregon Department of State Lands (DSL) and conservationists including the Willamette Partnership are pushing for stronger ways of planning for, choosing, and evaluating sites and that this may prove constraining to mitigation bankers."


"1. Today I want to tell you about the social relations and spatial logics motivating environmental regulators, conservationists, and eco-entrepreneurs in Oregon plan as they choose, and evaluate where in the landscape to do wetland and stream restoration for a cap and trade-type market. I’ll show how the state’s and conservationists’ efforts to map priority locations for restoration and to point out these places to entrepreneurs are market-constraining, but perhaps only in the short-term. The takeaway here is that many of the new or revamped markets in ecosystem services we are seeing may not be about ecosystem commodification and commercialization so much as they are about state formation, power, and legitimacy.


2. Let’s start here. Welcome to the Half Mile Lane site in exurban Portland, Oregon. It provides a number of ECS.
 
3. The wetland you see stores and delays water, which mitigates flood impacts for downstream homes. 


4. The stream provides habitat for salmon that migrate into the foothills of the Coast Range. 

5. A couple of years ago, state environmental agencies like the Oregon Department of State Lands (DSL) and conservationists including the Willamette Partnership undertook ecological restoration on the site, turning old farmland and a straightened ditch into a productive wetland and stream. This work was done for a market where developers purchase offsets for impacts to wetlands and streams. HML also serves a demonstration project for what regulators and conservationists see as stronger metrics for the market, both of what counts as successful restoration, as well as what locations in the watershed are worthwhile to do restoration projects.

6. As global ECS pundit Pavan Sukhdev explains to us, these markets are supposed to be about valuing nature. 

7. Well, what does that mean? For him – and we hear this quote a lot - “we cannot manage what we do not measure,” which means measuring the nature’s benefits and doing so as a $ price. 

8. Price itself, however, is not an ecological measure. Lest you think the focus on “value” is the domain solely of pundits like Sukhdev, consider what the Oregon DSL – one of the environmental agencies – has to say. For DSL, it means the opportunity to provide an ecological function. 

9. Importantly, this opportunity is location-based; it’s spatial, contextual, embedded. 

10. HML has the opportunity to mitigate flood impacts, because it is upstream of homes

11. and downstream of logging and mining operations that increase runoff.

12. So the question is: how do Oregon’s market actors measure the value of ecosystem services? Put more concretely - where in the landscape do they plan and choose to do restoration for the market and why? Sukhdev makes the challenge of resource protection sounds so easy when he says that all that needs to be done to prevent environmental degradation is to “put a value on” nature. But the task of valuation has not been so effortless in Oregon.

In the rest of this talk I want to walk you through the assessment of restoration sites in Oregon’s market, and how they become valued as places to do restoration. There are three moments to this, but they are moments that put the interests of regs and cons against the interests of entrepreneurs. I want to demonstrate an at least short-term strength of state agencies against entrepreneurs in constraining a kind of accumulation by restoration. New ventures in market governance may not deepen ecosystem commodification and commercialization as much as they throw up roadblocks. While these may only be short-term constraints, we should pay attention to them as potential moments where the market collapses under its own contradictions.

13. I first want to take a second to make sure we’re on the same page about how these markets work. In US markets for wetland and stream ecosystems, state and federal environmental regulatory agencies – ACOE, EPA, DSL - allow developers to make up for resource degradation by compensating entrepreneurs (or, “mitigation bankers”) who speculatively restore ecosystems. A good example: Early last year DSL authorized the trade of four salmon habitat credits to the Tualatin Hills Parks and Recreation Department (THPRD). 

14. DSL did not sell the Half Mile Lane (HML) property itself, where it had restored salmon habitat. Instead, it dealt THPRD ECS credits. These credits are a measure of both the quality and quantity of habitat functions “uplifted” after DSL replaced a culvert and performed other stream and wetland restoration work at HML. 

15. THPRD wanted these credits so it could tell environmental regulators that it had adequately compensated for a trail bridge it is building that will degrade habitat elsewhere in the watershed. Note that in this case a state agency, DSL, was the one selling credits, but more often it is a private entrepreneur.

16. Either way, the idea is to ensure some kind/degree of ecological equivalence, and this is the art and science of assessment. 

17. There is at once a strictly ecological assessment, which measures ecological functions on a site, but also these kinds of trade demand an assessment of the value of the ecosystem services in question. Value scores are 1-10 rankings of each function’s (e.g. water storage and delay) ability to provide some service (e.g. flood mitigation). 

18. In the assessment moment, restoration bankers hire ecologically-trained consultants to use several online mapping utilities to gage how ecological processes occur across the landscape and affect the site where bankers have chosen to do restoration. 

19. Here’s one of the key mapping utilities consultants use, called Oregon Explorer. It’s bringing a lot of data from beyond the boundaries of the site together, and showing it to the user in one frame. Hydric soils are the orange/yellow, but we also see the 100 year floodplain downstream of the site. Consultants have to answer questions about landscape context by using OE to, for instance, draw a 2 mile radius circle around the site to see how many other similar habitats the site is connected to in the area, or what sources of ecological stress are nearby, like the quarry. The key point here is that the value score of a banker’s site is relational to the site’s surroundings – but these are things which the banker has no or little control over.

20. Bankers and their consultants then have to take their scores to regulators. Agency staff judge the offsite stressors and risks consultants find in their assessment in the regulatory moment when they approve, deny, or modify a banker’s choice of where to do restoration. 

21. For instance, regulators often focus on reed canary grass, an invasive species that can spread rapidly on a restoration site from without and foil a project. They question whether a site and its landscape surroundings will, in the end, prove valuable if there is too much RCG around. Environmental agencies can in this moment modify a banker’s proposal to work on a certain piece of ground that is particularly susceptible to weeds by asking them to put more money into a long-term management.

22. Bankers then finally have to sell their credits. This is a market moment to value’s measure. What non-profit conservationists like WP want to see happen in the market is that when a banker brings a site to the market, to get their credits to sell, the amount they get depends in large part on the location of their project. 

23. These are “priority areas” - habitat sites mapped by state environmental agencies, and collated by TNC. 

24. The idea is that bankers would get the full amount of credits if they were doing restoration in a priority area and less if they were not. The problem is that if a banker had to do work in a priority area lest they not get as many credits as they expected, they’d be incentivized to work on land they might not normally restore. But being driven to work in priority areas would mean a narrower range of landowners they could work with. And all else equal, bankers want to work on sites where they can get the most credit bang for their restoration buck. This system means having to work on sites with higher costs of restoration and potentially higher land prices, both of which would cut into their profits.

To be clear: this isn’t how the market currently works, but regulators are using GIS to see/check whether bankers are siting in priority areas, and conservationists are pushing for this trading ratio protocol to be adopted. It is still part of the discussion on the ground in Oregon, about what the market should and will look like.

25.In general, then, through all three moments, how state agencies in Oregon - with help from the conservationists who have helped map priority areas and author market protocols - how they assess ecosystem service value in site selection proves constraining to entrepreneurs. 

26. Assessment – the landscape context they have to look at weighs bankers down

27. Regulatory – bankers have to put more capital into long-term management

28. Market – they will not get full credit, have to work in different places

29. Bankers are in fact rather unhappy about this way of valorizing restoration – and question regulators’ authority to do it. It’s come to the point where entrepreneurs may take state agencies to court on the issue and stop doing more restoration for the market. And so what we see here is not the state rolling out the conditions for market success, but genuine market constraints.

30. I do want to caution that this only holds for the current political moment. We know that every crisis can become an opportunity. In the long-term, what we might see is bankers getting used to regulators’ expectations about where it is valuable to do restoration. Indeed, the way state agencies have mapped out priorities might only serve as sort of visual aids to bankers, making it easier for them to find sites. This would facilitate the commodification and commercialization of ecosystem restoration and provide more opportunities for developers to just buy credits for their resource impacts.

31. And so, to wrap up, what I think this case does for us is two-fold. First, it reminds us to pay attention to the spatial logics of these markets, asking what sort of notions of spatial efficiency and prioritization constitute these markets, besides the idea that there is a difference in opportunity costs between global north and south. Karen McAfee has called efficiency “the holy grail of environmental economics.” I agree, but I’d add that spatial efficiency, which economists would think about as equimarginality, is a similar crusade.

32. Also, while the search for value might be what makes attempts at ecosystem markets and payments look similar across the globe (Robertson 2012), this case suggests a need to keep paying attention to change over time, within specific historical-geographical contexts to see the moments where neoliberal conservation confronts its own contradictions, and what happens. 

33. In the short-term, we might see moves by the state and conservationists to implement new measures of restoration success not as a deepening of commodification and commercialization, but as having the effect of slowing the market.

In the long-run, it might only enhance capitalist investment in restoration in particular places at the expense of others, in what several scholars have named as the variegation of neoliberal natures or conservation.Either way, demarcating the difference between the two can tell us a lot how about market-oriented conservation projects succeed and fail, and to what effect."

Monday, January 14, 2013

Current Hot and Cold Weather Extremes

2012 was the hottest year on record beating out the old recognized record setter 1998 (this title is disputed between 1998 and 1934), according to the National Oceanic and Atmospheric Administration.  The organization's press release stated "2012 marked the warmest year on record for the contiguous United States with the year consisting of a record warm spring, second warmest summer, fourth warmest winter and a warmer-than-average autumn. The average temperature for 2012 was 55.3°F, 3.2°F above the 20th century average, and 1.0°F above 1998, the previous warmest year."  Of interesting note there was a notable drop in the number of hurricanes.

NOAA's map below does a good job showing how new heat records, along with drought, was pretty much widespread over the United States.



Down under in Australia the Australian Bureau of Meteorology made a new color in order to display temperature forecasted between 54 and 56 degrees Celsius (129 to 133 Fahrenheit).

So hot it went from black death to somesort of deep cosmic purple
Meanwhile other places are experiencing extreme cold.  Asia is currently going through extreme winter weather.  The Levant saw a major snowstorm which brought up to eight inches of snow in Israel, covered Jerusalem, and froze Syrian refugees to death.  India and China's temperatures have broken or matched record cold.  Hundreds if not more have frozen to death in these populace lands.

Interestingly enough, despite record annual warm temperatures, the snow extent in North America for December was the largest ever recorded.  This despite global warming/climate change models which predicted less snow.


Thursday, August 16, 2012

America's Carbon Dioxide Output at Twenty Year Low Due to Natural Gas

The economic slow, conservation efforts, and most importantly cheap, domestically produced natural gas have reduced the United States' carbon dioxide (CO2) output levels to a twenty year low.  The drop is primarily due to the increase drilling and exploitation of shell gas, which has given North Dakota one of the strongest economies in the nation. 

The primary means of getting shell gas are horizontal drilling and fracking (post on this coming fairly soon).

The need for energy at a reasonable price will further drive shell natural gas drilling in the country.  Looking at a map of shell gas, it is clear there is plenty of room for gas-driven economic growth in the interior of the country.

Dark pink is areas currently being tapped while light pink are untapped basins.  Yellow is potential.  From the Energy Information Administration.  Click to enlarge.


Tuesday, July 17, 2012

Tree Ring Study Shows Overall Cooling Trend, Recent Temperature Spike

According to a new study by German scientists (in fact they are Geographers), an examination of tree rings has shown that the Roman and pre-Roman periods of Europe were actually warmer than the Medieval Warm Period.  The study shows how from 138 BC up to the 1900s experienced a very notable cooling trend.  This trend has, at least for now, been stopped by recent warming trends.

The wild, overall cooling trend of temperature.  Image from Institute of Geography, JGU
The tree rings challenge all sides of the global warming/climate change debate.  The rings show yet again that there is a warming trend.  However, it shows that the past was warmer and that climate change occurred naturally.  Yet again all scientists must wonder what temperature setting, if any, is optimal, and what forces are at work influencing climate change in all regards.  With any hopes this will help silence alarmists who only cloud the climate change debate.

Tuesday, July 03, 2012

NOAA on Derecho Storms

The news has been full of stories about the "Derecho" storm which slammed into the Eastern United States bringing death and destruction from Ohio to Delaware and Pennsylvania to South Carolina.  I was even caught in the initial blast of the storm due to poor analytic skills (note to self:  just because one measures lightning being three miles/five kilometers away does not mean the rain and wind are that far away as well).

Sadly, I never took a course in meteorology so I would be a horrible blogger if I tried to describe the science of a derecho.  However, NOAA has an excellent internet resource on the storms full of useful information including

A derecho (pronounced similar to "deh-REY-cho" in English, or pronounced phonetically as "") is a widespread, long-lived wind storm that is associated with a band of rapidly moving showers or thunderstorms. Although a derecho can produce destruction similar to that of tornadoes, the damage typically is directed in one direction along a relatively straight swath. As a result, the term "straight-line wind damage" sometimes is used to describe derecho damage. By definition, if the wind damage swath extends more than 240 miles (about 400 kilometers) and includes wind gusts of at least 58 mph (93 km/h) or greater along most of its length, then the event may be classified as a derecho.

A derecho may be associated with a single bow echo or with multiple bows. Bow echoes themselves may consist of an individual storm, or may be comprised of a series of adjacent storms (i.e., a "squall line" or "quasi-linear convective system") that together take on a larger scale bow shape. Bow echoes may dissipate and subsequently redevelop during the course of given derecho. Derecho winds occasionally are enhanced when a rotating band of storms called a "bookend vortex" develops on the poleward side of the bow echo storm system. Derecho winds also may be augmented on a smaller scale by the presence of embedded supercells in the derecho-producing convective system.

Derecho winds are the product of what meteorologists call "downbursts." A downburst is a concentrated area of strong wind produced by a convective downdraft. Downbursts have horizontal dimensions of about 4 to 6 miles (8 to 10 kilometers), and may last for several minutes. The convective downdrafts that comprise downbursts form when air is cooled by the evaporation, melting, and/or sublimation of precipitation in thunderstorms or other convective clouds. Because the chilled air is denser than its surroundings, it becomes negatively buoyant and accelerates down toward the ground. Derechos occur when meteorological conditions support the repeated production of downbursts within the same general area. The "downburst clusters" that arise in such situations may attain overall lengths of up to 50 or 60 miles (80 to 100 kilometers), and persist for several tens of minutes. Within individual downbursts there sometimes exist smaller pockets of intense winds called "microbursts." Microbursts occur on scales (approximately 2 1/2 miles or 4 km) that are very hazardous to aircraft; several notable airline mishaps in recent decades resulted from unfortunate encounters with microbursts. Still smaller areas of extreme wind within microbursts are called "burst swaths." Burst swaths range from about 50 to 150 yards (45 to 140 meters) in length. The damage they produce may resemble that caused by a tornado.

Be sure to read more about these storms on the website!   And remember, NOAA is a great resource for all weather related phenomenon.