Monitoring Tsunami Impacts Across the Pacific; Air Quality Concerns; Dangerous Heat; Critical Fire Weather for the West

Tsunami impacts continue for portions of the Pacific basin. Wildfire smoke causes unhealthy air in Midwest to Great Lakes. Heat dome spans Mississippi Valley to Mid-Atlantic with excessive heat warnings and advisories. Critical fire weather in Great Basin to Pacific Northwest (dry thunderstorms). Cold front spawns severe storms/heavy rain in Central U.S. today, shifts to East Coast Thursday. Read More >

Hazardous Weather Conditions

Current conditions at

Fort Belvoir (KDAA)

Lat: 38.72°NLon: 77.18°WElev: 69ft.

Fair

85°F

29°C

Humidity	77%
Wind Speed	E 5 mph
Barometer	29.92 in (1013.4 mb)
Dewpoint	77°F (25°C)
Visibility	10.00 mi
Heat Index	96°F (36°C)
Last update	30 Jul 7:55 pm EDT

More Information:

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

Extended Forecast for

2 Miles SW Fort Washington MD

Flood Watch July 31, 02:00pm until August 1, 02:00am

Click here for hazard details and duration

Flood Watch

Tonight
Low: 77 °F
Partly Cloudy
Thursday
High: 93 °F
Sunny then
Chance
T-storms
Thursday Night
Low: 71 °F
T-storms then
Showers
Friday
High: 78 °F
Chance
Showers then
Chance
T-storms
Friday Night
Low: 65 °F
Chance
T-storms then
Slight Chance
Showers
Saturday
High: 80 °F
Mostly Sunny
Saturday Night
Low: 63 °F
Mostly Clear
Sunday
High: 81 °F
Mostly Sunny
Sunday Night
Low: 63 °F
Partly Cloudy

Detailed Forecast

Tonight

Partly cloudy, with a low around 77. South wind around 5 mph becoming calm in the evening.

Thursday

A slight chance of showers between 1pm and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 93. Heat index values as high as 103. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 30%.

Thursday Night

Showers and thunderstorms likely before 8pm, then showers and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Low around 71. Southeast wind around 5 mph becoming light and variable in the evening. Chance of precipitation is 80%. New rainfall amounts between 1 and 2 inches possible.

Friday

A chance of showers and thunderstorms. Mostly cloudy, with a high near 78. North wind 6 to 9 mph. Chance of precipitation is 50%.

Friday Night

A chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. North wind around 8 mph, with gusts as high as 18 mph. Chance of precipitation is 30%.

Saturday

Mostly sunny, with a high near 80.

Saturday Night

Mostly clear, with a low around 63.

Sunday

Mostly sunny, with a high near 81.

Sunday Night

Partly cloudy, with a low around 63.

Monday

Mostly sunny, with a high near 82.

Monday Night

Partly cloudy, with a low around 66.