75°Mostly Cloudy

by Karen Goff July 10, 2014 at 4:00 pm 1,673 0

"Polar Vortex" type outlook for the week of July 14/Credit: NOAA

Northern Virginia residents who are sweating through a typical D.C.-area summer are about to get a visit from an old friend.

The Capital Weather Gang reports that the Polar Vortex, last winter’s frigid weather pattern that gripped much of the country with record cold temperatures, may be returning.

Says the Capital Weather Gang, who calls the pattern “A poor man’s Polar Vortex:

Call it the ghost of the polar vortex, the polar vortex sequel, or the polar vortex’s revenge. Meteorological purists may tell you it’s not a polar vortex at all. However you choose to refer to the looming weather pattern, unseasonably chilly air is headed for parts of the northern and northeastern U.S at the height of summer early next week.

Bearing a haunting resemblance to January’s brutally cold weather pattern, a deep pool of cool air from the Gulf of Alaska will plunge into the Great Lakes early next week and then ooze towards the East Coast.

Of course, this is July, not January, so temperatures forecast to be roughly 10 to as much as 30 degrees below average won’t have quite the same effect.

While the Midwest, particularly the upper Midwest, will see some fall-like weather, here in Reston it may just actually be really pleasant. The Capital Weather Gang says temperatures here are likely to be about 10 degrees below normal.  Highs may struggle to reach 80 in D.C. on Tuesday and Wednesday, with widespread lows in the 50s (even 40s in the mountains).

Meteorologists have been commenting on the rarity of a weather pattern that looks so similar hitting a region in both summer and winter: Low pressure over the Aleutians near Alaska, a large hit ridge over the Western U.S., and a huge cold low or vortex over the Great Lakes.

In any case, 80 in July sounds much more pleasant than 99. Or 5 below.

by Karen Goff January 27, 2014 at 4:15 pm 0

Ice covered trees/FIle photoBeware — sunny skies and mild temperatures Monday afternoon will give way to return of the Polar Vortex on Tuesday.

The National Weather Service has issued a Wind Chill Advisory for Tuesday.

After sundown on Monday, temperatures will fall rapidly, with strong winds adding to the chill. The NWS says wind chills will reach 5 to 10 degrees below zero. The good news? It is not expected to snow.

From the NWS:

WIND CHILL ADVISORY IN EFFECT FROM 1 AM TO 10 AM EST TUESDAY…

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS ISSUED A WIND CHILL ADVISORY…WHICH IS IN EFFECT FROM 1 AM TO 10 AM EST TUESDAY.

* WIND CHILLS…5 TO 10 BELOW ZERO.

* TEMPERATURES…SINGLE DIGITS TO LOWER TEENS LATE TONIGHT INTO EARLY TUESDAY MORNING.

* WINDS…NORTHWEST 10 TO 15 MPH WITH GUSTS UP TO 25 MPH.

* IMPACTS…LOW WIND CHILLS MAY LEAD TO HYPOTHERMIA OR FROST BITE ON EXPOSED SKIN.

Area school systems canceled classes when temperatures previously fell this low in early January. Reston Now will keep you updated if we hear of any closings, delays or cancelations.

On Friday, about 200 buses had trouble starting when morning temperatures reached the single digits.

FCPS has already had six weather closings this school year.

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