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Posted at 07:45 PM ET, 05/17/2011

PM Update: Quieter, but showers and storms still possible

* Flash flood watch for north/west area through 2 a.m. tonight; coastal flood warning for the District, Alexandria and western shore of Chesapeake Bay through noon Wednesday (then coastal flood advisory through 6 a.m. Thursday); coastal flood advisory for remainder of tidal Potomac through 6 a.m. Thursday *

7:45 p.m.:Despite afternoon and evening conditions remaining favorable for additional shower/storm activity, little has materialized. Right now only extremely spotty and very light showers remain over parts of the area, and we don’t seem to be in line for much more in the short term. Because of this, the National Weather Service has canceled much of the flood watch for the area, with places like Loudoun and Fauquier counties still included, mainly due to earlier rains.

3:45 p.m.: The periodic downpours expected so far today have mainly concentrated well southwest of the metro region. As a result, outside an isolated shower or two, it’s been an OK day, with mostly cloudy skies and temps climbing into the low 70s. Some scattered showers and storms are possible through this evening, and a few of them could be severe.

Through Tonight: Some showers and thunderstorms should develop in the muggy late afternoon and evening air - but the activity looks to be intermittent and may not affect everyone. Favored areas to see storms are south, west, and southwest of D.C (i.e generally west of I-95, with more isolated activity east). As the storms track toward the northwest, lookout for torrential rain and dangerous lightning where they occur, and possibly some strong winds and even small hail. Rain amounts may average around 0.25-0.5”, but with large variability. Some spots could exceed 1”, where others get very little. Temperature slowly fall through the 60s.

Monitor severe warnings issued by the National Weather Service and radar on our Severe Weather Tracking Station below. Also, comment below with conditions where you are.

Severe Weather Tracking Station
Warning Text: DC | MD | VA * NWS Local Storm Reports
Radar & Lightning: Movement of precipitation and lightning strikes over past two hours. Refresh page to update. Click here to see radar bigger.
    
LWX Warnings
Warnings: Severe alerts from National Weather Service. Updates w/o refresh (most browsers). Hint: Alert on map? Click matching label in key for details.

Tomorrow (Wednesday): Like today, skies are mostly cloudy and intermittent showers and storms likely develop. We may well see more rainfall than today, given closer proximity of the upper level disturbance. The heaviest, most concentrated rain is probably in the afternoon or evening. Heavy rainfall amounts of over 1” are possible in some areas, whereas other areas may see very little rain. It’s humid, with highs in the low 70s.

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

Walter Reed Pollen update:The last 24 hour count is incomplete due to heavy rain showers. Mold spores remain HIGH at 18,937.41 spores/cubic meter of air. Tree pollen is MODERATE at 67.73 gr/cubic meter, grass pollen is HIGH 17.89 gr/cubic meter and weed pollen is LOW at 0.64 gr/cubic meter of air.

Central Va. rain: Heavy rain and flash flooding have occurred over portions of central Virginia. Charlottesville, Va. has received 2.86” in the last 24 hours. Many reports of flooded highways have come out of Shenandoah, Rockingham, Albermarle, Culpeper, Orange, Madison, and Greene counties.

By  |  07:45 PM ET, 05/17/2011

Categories:  Forecasts

 
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