Heat Persists in the Southwest; Elevated to Critical Fire Weather in the Great Basin; Poor Air Quality in the West

Dangerous heat will persist across the Southwest U.S. through this week, easing by next week. The heat will focus further east in the Great Plains and Mississippi Valley beginning next week. Elevated to locally critical fire weather conditions will persist for the Great Basin today. Poor air quality lingers for the Northwest, Great Basin, Central Rockies into the Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Washington Manassas Airport (KHEF)

Lat: 38.72°NLon: 77.52°WElev: 194ft.

Fair

87°F

31°C

Humidity	55%
Wind Speed	SE 10 mph
Barometer	30.06 in (1018.2 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Heat Index	91°F (33°C)
Last update	4 Aug 3:56 pm EDT

More Information:

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

Extended Forecast for

5 Miles ESE Washington Manassas Airport VA

Flood Watch August 5, 04:00am until August 5, 11:00am

Click here for hazard details and duration

Flood Watch

Tonight
Low: 70 °F
Mostly Cloudy
then Showers
Wednesday
High: 87 °F
Showers
Likely and
Patchy Fog
then Chance
T-storms
Wednesday Night
Low: 72 °F
Chance
T-storms then
Chance
Showers
Thursday
High: 91 °F
Sunny then
Slight Chance
T-storms
Thursday Night
Low: 72 °F
Slight Chance
T-storms then
Slight Chance
Showers
Friday
High: 90 °F
Sunny then
Chance
T-storms
Friday Night
Low: 71 °F
Chance
T-storms
Saturday
High: 91 °F
Mostly Sunny
then Chance
T-storms
Saturday Night
Low: 70 °F
Chance
T-storms then
Chance
Showers

Detailed Forecast

Tonight

A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 70. East wind 5 to 7 mph becoming calm in the evening. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday

Showers likely and possibly a thunderstorm before 10am, then a chance of showers and thunderstorms after 10am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 87. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night

A chance of thunderstorms before midnight, then a chance of showers between midnight and 1am. Mostly cloudy, then gradually becoming clear, with a low around 72. South wind 3 to 5 mph. Chance of precipitation is 30%.

Thursday

A slight chance of showers and thunderstorms after 2pm. Sunny, with a high near 91. Heat index values as high as 102. Southwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

Thursday Night

A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 72. South wind around 6 mph. Chance of precipitation is 20%.

Friday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 90. Chance of precipitation is 40%.

Friday Night

A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 71. Chance of precipitation is 40%.

Saturday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 91. Chance of precipitation is 40%.

Saturday Night

A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.

Sunday

Mostly sunny, with a high near 90.

Sunday Night

Partly cloudy, with a low around 72.