From the ABC 7 Weather team

April Warm Spell Continues: Any Record Heat?

April 10, 2013 - 05:00 AM
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A quick jump in seasons with near summer-like heat in D.C.  Records possible before another big temperature swing.



It feels like we completely skipped the spring season with 50 degree high temperatures last week (average for late February) and 80 degree highs this week (average for early June).  Where's spring??

Spring is taking a little hiatus, but will return by the weekend.  In the mean time, high temperatures climbed to the 80 degree mark in Washington on Monday, which was the first 80 degree day, since October 24, 2012.  Yesterday, all of the region made it into the 80s with Reagan's high 86°.

Highs Tuesday April 9th

No records have been reached.... yet.  Today will be the hottest day this week and records are likely to be tied or broken.  In fact, I can almost guarantee Dulles will record a record.  The current record is 78° set back in 1992.  DCA and BWI's current record is 89° from 1922.

So how did it go from winter to summer in such a short period of time?  Well, it's all the position of the jet stream.  Last week, the polar jet was positioned very far south, which allowed cooler than average temperatures across much of the US.  This week, however, the jet stream is well north of Washington (over the Great Lakes and northern New England), but took a big dip in the west.  Check out the highs yesterday.  I drew a blue arrow to delineate the jet stream.

An area of high pressure off the Atlantic coast is bringing winds out of the southwest and pumping in the warm temperatures from the south.  The high has also kept the weather sunny.  A completely different story for folks out west. 

Surface Analysis for Wednesday, April 10

A strengthening area of low pressure over the south central Plains, in association with the diving jet stream is bringing a combination of snow and severe weather to the Plains.  The sharp contrast in temperatures along the front is causing very active weather.  In fact, some spots (Oklahoma City, for example) were under severe thunderstorm watches and winter weather advisories at the same time!  Check out the radar from yesterday evening.  Severe storms were firing up in parts of Oklahoma, Kansas, and Nebraska, but snow was falling in western parts of those states, too.

No sign of snow or wintry weather here, but the cooler weather will filter in for the weekend.  It won't be anywhere near the cold, single digit temperatures out west, but it will be a good 20 degrees cooler than temperatures today.  With highs in the middle 60s both Saturday and Sunday, it will be average April weather in Washington... go figure!



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