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What's happening now is "a really big kink in the jet stream, about as big as you can see anytime, covering the whole western U.S.," said heat wave expert Ken Kunkel, a professor of atmospheric sciences at North Carolina State University. To the west of the kink, in Arizona and Nevada, there's a high pressure system just parked there with stagnant heat, Kunkel said. And to its east are cool
-- even record cool -- temperatures in Texas, he said. Q: When will it end? A: The extreme heat should continue for about a week, but it won't set records, James said. Q: Is this related to the deadly Arizona fire? A: "There's most assuredly a link" between the heat wave and the fire, Jacks said. It gets hot with extremely dry air, and then a no-rain lightning strike ignites bone-dry fuel into a fire. Q: Is this global warming? A: No single event can be blamed solely on man-made global warming, scientists and meteorologists say. But this is the type of heat wave than scientists have long said will be more common as the world warms. Some, but not all, scientists also theorize that the jet stream is having more of these crazy kinks lately because of a warming Arctic and melting sea ice. Pennsylvania State University climate scientist Michael Mann said there's an element of randomness in the current weather. Yet with all-time heat records in the past few years being broken at three times the expected rate, he said, "there can be little doubt that climate change and global warming are playing a role." ___ Online: NOAA on heat waves: NOAA beating the heat tips: CDC on heat waves:
http://www.noaawatch.gov/themes/heat.php
http://www.noaa.gov/features/
earthobs_0508/heat.html
http://www.bt.cdc.gov/disasters/extremeheat/
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