. . WEATHER : SCIENCE : ENVIRONMENT: GLOBAL WARMING AND CLIMATE CHANGE: Weather Extremes Tied to Jet Stream Changes . . Weather Extremes Tied to Jet Stream Changes By: Seth Borenstein Published: June 25, 2013 Wunderground.com http://www.wunderground.com/news/ heat-wave-alaska-jet-stream-may-be-blame-20130625 . A shorter URL for the above link: . http://tinyurl.com/nuf6yan . .WASHINGTON -- The jet stream, the river of air high above Earth that generally dictates the weather, usually rushes rapidly from west to east in a mostly straight direction.
.But lately it seems to be wobbling and weaving like a drunken driver, wreaking havoc as it goes.
.The more the jet stream undulates north and south, the more changeable and extreme the weather.
.The most recent example occurred in mid-June when some towns in Alaska hit record highs. McGrath, Alaska, recorded an all-time high of 94 degrees on June 17. A few weeks earlier, the same spot was 15 degrees, the coldest recorded for so late in the year.
.You can blame the heat wave on a large northward bulge in the jet stream, Rutgers University climate scientist Jennifer Francis said.
.Several scientists are blaming weather whiplash - both high and low extremes - on a jet stream that's not quite playing by its old rules. It's a relatively new phenomenon that experts are still trying to understand.
. Some say it's related to global warming, but others say it's not. .Upside-down weather also happened in May: Early California wildfires fueled by heat contrasted with more than a foot of snow in Minnesota. Seattle was the hottest spot in the nation one day, and Maine and Edmonton, Canada, were warmer than Miami and Phoenix.
. Consider these unusual occurrences over the past few years: .- The winter of 2011-12 seemed to disappear, with little snow and record warmth in March. That was followed by the winter of 2012-13 when nor'easters seemed to queue up to strike the same coastal areas repeatedly.
.- Superstorm Sandy took an odd left turn in October from the Atlantic straight into New Jersey, something that happens once every 700 years or so.
.- One 12-month period had a record number of tornadoes. That was followed by 12 months that set a record for lack of tornadoes.
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