Severe Thunderstorms Tonight in the Mid-Atlantic; Tropical Storm Bertha in the Gulf

Scattered thunderstorms with severe gusts, hail and a tornado risk are possible near a cold front from the Ohio Valley to the Mid-Atlantic tonight. Tropical Storm Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the panhandle of Florida into Louisiana through Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Thunderstorm Light Rain

76°F

24°C

Humidity	91%
Wind Speed	S 5 mph
Barometer	29.76 in (1007.5 mb)
Dewpoint	73°F (23°C)
Visibility	8.00 mi
Heat Index	76°F (24°C)
Last update	21 Jul 7:52 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Chantilly VA

Severe T-storm Watch July 21, 08:39pm until July 21, 10:00pm

Click here for hazard details and duration

...

Severe T-storm Watch July 21, 08:39pm until July 21, 10:00pm
NOW until 10:00pm Tue
Severe T-storm Watch
Tonight
Low: 71 °F
Severe
Thunderstorms
and Patchy
Fog
Wednesday
High: 85 °F
Slight Chance
Showers then
Chance
T-storms
Wednesday Night
Low: 63 °F
Chance
T-storms then
Mostly Cloudy
Thursday
High: 80 °F
Mostly Sunny
Thursday Night
Low: 61 °F
Partly Cloudy
Friday
High: 81 °F
Sunny
Friday Night
Low: 63 °F
Mostly Cloudy
then Slight
Chance
Showers
Saturday
High: 81 °F
Slight Chance
Showers

Detailed Forecast

Tonight

Showers and thunderstorms before 2am, then scattered showers between 2am and 5am. Some of the storms could be severe. Patchy fog between 1am and 3am. Low around 71. Southwest wind around 9 mph, with gusts as high as 20 mph. Chance of precipitation is 100%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

A slight chance of showers between 11am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 85. West wind 7 to 10 mph. Chance of precipitation is 50%.

Wednesday Night

A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 9pm. Mostly cloudy, with a low around 63. North wind 7 to 9 mph. Chance of precipitation is 30%.

Thursday

Mostly sunny, with a high near 80. North wind 8 to 11 mph.

Thursday Night

Partly cloudy, with a low around 61. Northeast wind around 6 mph becoming calm in the evening.

Friday

Sunny, with a high near 81.

Friday Night

A slight chance of showers after 2am. Mostly cloudy, with a low around 63. Chance of precipitation is 20%.

Saturday

A slight chance of showers before 2pm. Partly sunny, with a high near 81. Chance of precipitation is 20%.

Saturday Night

Partly cloudy, with a low around 65.