19:05 – Strong storm guard set; Shallow Storming Through Sunset
Most of the storm activity has left the region, but a few isolated storms south of Interstate 66 near Manassas and Burke continue to push southeast toward Interstate 95 south of the Beltway.
Most storms should leak from the region or disperse until sunset.
This is the last update in this post. Full prediction through Sunday can be found in our PM update.
17:20. – Storms, some heavy, south and east of Washington
Two storm zones in the region have triggered severe thunderstorm warnings.
The first is between Bowie and Annapolis, where there is a severe thunderstorm warning until 6pm. Storms in this area can cause heavy gusts of wind and light hail in addition to heavy rain and lightning.
A second area of storms is from Dale City and to the southeast. This area of storms will push through Charles County until 6:00 pm where there is also a severe thunderstorm warning.
Once these storms have disappeared, much of the region should take a breather before storms, though we can not do so to rule out one or two isolated storms at sunset or so completely.
16:13 – Serious storm warnings for eastern Montgomery, Howard and the southern counties of Prince George until 17:00.
A cell moves southeast through Montgomery and Howard County. This storm could hit the area east of Olney at 16:30 – 16:45. Colombia is on its way towards 17.00 or just before this storm.
A second strong cell, also under warning, approaches Fort Washington in southern Prince George's County and points at Brandywine and Waldorf over the next 45 minutes.
In addition to lightning and heavy rain, strong to noxious winds and small hail are possible in these cells.
As the storm swept through the area between Huntington and Mt. Vernon, we received several reports of mostly small hail but a few stones the size of a quarter:
Original mail from the afternoon
It's hot and awesome humid, and these conditions could fuel storms from the west and northwest into the evening.
A severe thunderstorm was issued to the region until 19:00. In addition to pouring rain and frequent lightning, storms can also produce harmful gusts of wind. Some storms can also cause hail (5% chance).
Keep in mind that although a watch can provide favorable conditions for storms, it does not guarantee that it will affect your location. However, if a severe thunderstorm is issued for your area it means that a dangerous storm is imminent and you should seek protection.
By the middle of the afternoon, a mass of thunderstorms had developed along a cold front in central Pennsylvania. The storms moved southeast, and there are some concerns that these storms could continue to spread into the very unstable air mass that is above the DC region in northern Maryland and northeast Maryland.
The timing of this series of battles, if that is the case in the Washington area, would be between 4pm and 7pm from northwest to southeast. However, there is a certain likelihood that these storms will remain mainly in the north of Maryland and threaten north-northeast of Interstate 70 from Frederick to Baltimore.
Occasional storms piled up in front of this line, mainly along and east of Interstate 95. Occasional storms have become heavier, with small accumulations of noxious gusts of wind (or microbursts).
We will update this post if organized heavy storms threaten the Washington area.