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

Hazardous Weather Outlook

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	30.07 in (1018.6 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Heat Index	91°F (33°C)
Last update	4 Aug 4:56 pm EDT

More Information:

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

Extended Forecast for

Broad Run VA

Tonight
Low: 69 °F
Mostly Cloudy
then Showers
Likely
Wednesday
High: 84 °F
Showers
Likely and
Patchy Fog
then Chance
T-storms
Wednesday Night
Low: 71 °F
Chance
T-storms then
Chance
Showers
Thursday
High: 89 °F
Sunny then
Chance
T-storms
Thursday Night
Low: 71 °F
Chance
T-storms then
Slight Chance
Showers
Friday
High: 88 °F
Sunny then
Chance
T-storms
Friday Night
Low: 69 °F
Chance
T-storms
Saturday
High: 88 °F
Mostly Sunny
then Chance
T-storms
Saturday Night
Low: 69 °F
Chance
T-storms

Detailed Forecast

Tonight

A chance of showers before 2am, then a chance of showers and thunderstorms between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 69. East wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday

Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms after 11am. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 84. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Wednesday Night

A chance of showers and thunderstorms before midnight, then a chance of showers between midnight and 1am. Mostly cloudy, then gradually becoming clear, with a low around 71. Southeast wind 3 to 6 mph. Chance of precipitation is 30%.

Thursday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89. South wind 7 to 10 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Thursday Night

A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 71. Southwest wind 3 to 7 mph. Chance of precipitation is 30%.

Friday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 50%.

Friday Night

A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.

Saturday

A chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88. Chance of precipitation is 50%.

Saturday Night

A chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.

Sunday

Mostly sunny, with a high near 88.

Sunday Night

Partly cloudy, with a low around 70.