Although official numbers won’t be confirmed for a few weeks, experts say that this past winter is all but sure to rank among the 10 warmest on record. And warmer winters have real consequences.
Visitors walk beneath cherry trees at the Congressional Cemetery in Washington, D.C., in unseasonably warm weather on Feb. 23.Denise ChowThe end of February marked the close of “meteorological winter,” which spans December, January and February and is a designation separate from the astronomical seasons, capping a string of months when weather played out in unexpected ways.
“It has really been quite a roller coaster,” Bob Henson, a meteorologist and writer for Yale Climate Connections, an online news service, said of the winter extremes.blooming days and weeks ahead of schedule Henson pointed to “striking” temperature contrasts across the U.S. as one example of the season’s strange variability. Last week, temperatures dropped in California, producing rare snow even at low elevations, while much of the Northeast basked in balmier-than-usual conditions and got little to no snow over the winter months.Spencer Platt / Getty Images
The jet stream is powered by temperature differences between the colder polar region to the north and warmer air masses to the south. Ripples in the jet stream are what produce day-to-day weather, but deeper troughs and ridges can develop that contribute to extremes by blasting cold air in one region and heating up others.
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