Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.
By: Dr. Jeff Masters , 2:29 PM GMT on July 12, 2012
The U.S. isn't the only country suffering from a severe wildfire season. Russian firefighters have been battling huge blazes in Siberia for months. Central Russia experienced record warm temperatures 11 - 12°F (6 - 7°C) above average during June, feeding fires that have burned more area in 2012 than in 2010--the year of the unprecedented heat wave that killed over 55,000 people. Smoke from this summer's Russian fires rose high into the atmosphere last week, and got caught in the jet stream. As University of Washington professor Dr. Cliff Mass explained in this blog, the strong winds of the jet stream carried the smoke to western North America this week, where sinking air associated with a strong area of high pressure brought the smoke to the surface. On Wednesday, CBC reported that the smoke had settled over Vancouver, British Columbia, reducing visibility and increasing air pollution. Meteorologist Eric Taylor of the B.C. Ministry of Environment said he had never seen ozone pollution levels as high in B.C.'s central Interior as occurred over the past few days. The smoke has created colorful sunsets from Oregon to British Columbia, but a low pressure system is expected to flush most of the smoke out by Friday.
Figure 1. Thick smoke from forest fires burning in Siberia on July 5, 2012 (left) and July 9, 2012 (right.) Image credit: NASA.
Figure 2. The view from West Vancouver, British Columbia on Wednesday was obscured by thick smoke from forest fires burning in Siberia. Image credit: ThemeGreen's Webcam.
Colorado's most destructive wildfire in its history finally contained
It's been another severe year for wildfires in the U.S., with the National Interagency Fire Center reporting 4800 square miles of burned acreage thus far in 2012, an area about 87% of the size of Connecticut. This is pretty close to the 10-year average for this point in the year, and ranks as the fourth highest of the past ten years. However, with summer not yet half over, and more than 2/3 of the Western U.S. experiencing moderate to extreme drought, the Western U.S. fire season still has plenty of time to add significant acreage to its burn total. The hardest-hit state at present is Idaho, where one-third of the country's large fires (twelve) are burning. The worst fires of 2012 so far have been in Colorado, which had its hottest and driest June since record keeping began in 1895. Colorado's most destructive wildfire in its history, the 29-square mile Waldo Canyon fire, was finally 100% contained on Wednesday, aided by a week of relatively cool and wet weather. The fire killed two people and destroyed nearly 350 houses when it burned into northwestern Colorado Springs. Colorado's second most destructive and second largest fire in recorded history was the High Park Fire, fifteen miles northwest of Fort Collins. The fire was 100% contained on June 30. According to the Denver Post, the High Park Fire burned in an area where 70% of the trees that have been killed by mountain pine beetles; the insects have devastated forests in western North America in recent years. So did pine beetle damage contribute to this year's devastating Colorado fires? Using Landsat satellite data, a team of scientists led by University of Wisconsin forest ecologist Phil Townsend have discovered that pine beetle damage appears not to have a significant impact in the risk of large fires, and may reduce fire risk in some instances (Video 1.)
Video 1. Wildfire and Pine Beetles: NASA explains how recent devastation of forests in the Rocky Mountains by the mountain pine beetle may be affecting wildfire odds.
Links to follow
Our climate change blogger, Dr. Ricky Rood, has a post on mountain pine beetles and climate change.
I have a post on how climate change is expected to increase Western U.S. fires.
Welcome to the Rest of Our Lives, an 8-minute video put together by climate change videographer Peter SInclair, provides a dramatic look at the extreme weather that has hit the U.S. in June and July.
Our climate change blogger, Dr. Ricky Rood, is in Boulder, Colorado this summer, and had this to say in his June 27 post on the wildfires in Colorado: "The past few days have been relentless. Denver has seen temperatures above 100°F for 5 straight days, and it was 105° today. At the weather station closest to where I live, the thunderstorm that started today’s fire stopped the temperature rise at 97.5 F. The dew point was in the high 30s. The ground temperature in the garden was about 110°. Tonight it all smells of smoke again. It is hard to sleep when the house is 88 degrees and the air smells of smoke. You constantly think of fire."
Death Valley hits 128°: 10th hottest temperature in U.S. history
The high temperature in Death Valley, California hit 128°F (53.3°C) on Wednesday, the hottest temperature measured in the U.S. since July 18, 2009, when Death Valley recorded another 128° reading. Yesterday's 128° was the 10th hottest temperature in U.S. history. The only hotter temperatures were all measured at Death Valley, the most recent one being the 129° measured on July 6, 2007. The all-time high for Death Valley is the 134° reading of July 10, 1913. The forecast for Death Valley calls for a slow cool-down over the next few days, with highs reaching "only" 105° on Monday. That's the date of the start of the grueling Badwater Ultramarathon. Covering 135 miles (217km) non-stop from Death Valley to Mt. Whitney, CA, it is the most demanding and extreme running race offered anywhere on the planet. Lace up your running shoes (not!)
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