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Posted at 03:30 PM ET, 06/02/2011

PM Update: Delightful dry air to close out work week

Following three straight days of hot and humid 95+ degree weather, today’s (by comparison) arid 80s have been heavenly. And it gets better tomorrow. We enjoy a crisp fall-like evening tonight before a day replete with sunshine Friday and pleasantly warm temperatures.

Temperatures: Latest D.C. area temperature map powered by iMapWeather (base map by Google). Click and hold on map to pan. Double-click to zoom. Refresh page to update. See larger map on our Weather Wall.

Through Tonight: Your air conditioner, no doubt, has been working over time. Give it a break tonight! Under clear skies, temperatures drop into the upper 40s in the cooler suburbs to the mid-to-upper 50s downtown.

Tomorrow (Friday): Something tells me this day will earn a 10/10 on our daily digit (but Camden makes the final call). Under mostly sunny skies (some high clouds may roll in during the afternoon), highs rise up into the low 80s. The air remains dry and a breeze from the north at 10-15 mph refreshes.

See David Streit’s forecast through early next week. And if you haven’t already, join us on Facebook and follow us on Twitter

Pollen update: Walter Reed reports trees are in the MODERATE range at 20.45 gr/cubic meter, grasses are HIGH at 29.07 gr/cubic meter, weeds are LOW at 3.83 gr/cubic meter and mold spores are in the MODERATE range at 9493.19 spores/cubic meter.

Tropical update: CWG tropical weather expert Greg Postel chimes in with the latest on the tropical disturbance we wrote about yesterday:

The thunderstorm cluster over the Gulf of Mexico (also known as an MCC, or mesoscale convective cluster) never really had a chance to evolve into a tropical system, even though it was named 93L as an area to watch. Likely dominated by outflowing air near the surface (as midlatitude convective clusters typically are), this system never had the internal structure required to maintain a warm core. The gust fronts moving away from the thunderstorms were a sign that downward-flowing cool, dry air was a major component of the circulation.

Its setup was basically designed to create a clockwise turning high pressure system near the surface. This is exactly unlike a tropical system, which is required to have a warm interior that is dominated by upward motion near a counterclockwise rotating swirl. In addition, the difference between the winds blowing across this system at middle altitudes (say 10,000 ft.) were 30 miles an hour stonger than those near much closer to the ground. This vertical wind shear blew apart any thunderstrom group that dared to last longer than a few hours, and should ensure that 93L will remain nothing more than a dying MCC.

By  |  03:30 PM ET, 06/02/2011

Categories:  Forecasts

 
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