Heavy Rainfall and Severe Thunderstorms in the Midwest and Ohio Valley Tuesday

Multiple rounds of severe thunderstorms appear likely Tuesday across the Midwest and Ohio Valley, with severe wind gusts in excess of 75 mph as the primary threat. Heavy to excessive rainfall may lead to considerable flash and urban flooding impacts Tuesday across portions of the Ohio Valley. A Moderate Risk (level 3 of 4) of excessive rainfall has been issued. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Overcast

72°F

22°C

Humidity	87%
Wind Speed	NW 6 mph
Barometer	29.98 in (1015.1 mb)
Dewpoint	68°F (20°C)
Visibility	10.00 mi
Last update	11 Aug 4:52 am EDT

More Information:

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

Extended Forecast for

2 Miles NNE Herndon VA

Overnight
Low: 73 °F
Chance
Showers
Tuesday
High: 89 °F
Chance
Showers then
Slight Chance
T-storms
Tuesday Night
Low: 69 °F
Chance
T-storms then
Chance
Showers
Wednesday
High: 86 °F
Chance
Showers
Wednesday Night
Low: 70 °F
Chance
Showers
Thursday
High: 88 °F
Mostly Sunny
then Slight
Chance
T-storms
Thursday Night
Low: 71 °F
Chance
Showers
Friday
High: 85 °F
Slight Chance
T-storms
Friday Night
Low: 64 °F
Partly Cloudy

Detailed Forecast

Overnight

A chance of showers. Mostly cloudy, with a low around 73. Light west wind. Chance of precipitation is 30%.

Tuesday

A chance of showers before 10am, then a slight chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 89. West wind 5 to 8 mph. Chance of precipitation is 30%.

Tuesday Night

A chance of showers and thunderstorms before 1am, then a chance of showers after 4am. Mostly cloudy, with a low around 69. Northwest wind 3 to 5 mph. Chance of precipitation is 30%.

Wednesday

A chance of showers, with thunderstorms also possible after 5pm. Partly sunny, with a high near 86. Northwest wind around 7 mph. Chance of precipitation is 30%.

Wednesday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Light and variable wind. Chance of precipitation is 30%.

Thursday

A slight chance of showers, with thunderstorms also possible after 5pm. Mostly sunny, with a high near 88. Chance of precipitation is 20%.

Thursday Night

A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am, then a chance of showers and thunderstorms after 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 30%.

Friday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 85. Chance of precipitation is 20%.

Friday Night

Partly cloudy, with a low around 64.

Saturday

Sunny, with a high near 81.

Saturday Night

Partly cloudy, with a low around 64.

Sunday

A chance of showers and thunderstorms. Mostly sunny, with a high near 86. Chance of precipitation is 30%.

Sunday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 50%.