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Severe Thunderstorms With Heavy Rain Possible from the Upper Midwest to the Mid-Atlantic; Excessive Heat For Central U.S.

Storms will move from the Upper Great Lakes to the Ohio Valley/Lower Great Lakes into the northern Mid-Atlantic through the day. Damaging winds, large hail, and flooding will be the primary threats with these storms. Excessive heat warnings and heat advisories are in place for states in the Central Plains, the Southeast, and the Mid-Atlantic. Localized flash flooding may occur in the Southwest. Read More >

Hazardous Weather Conditions

Current conditions at

Washington/Dulles International Airport, DC (KIAD)

Lat: 38.93°NLon: 77.45°WElev: 312ft.

Mostly Cloudy

81°F

27°C

Humidity 67%
Wind Speed NW 6 mph
Barometer 29.92 in (1012.7 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 21 Jul 10:52 pm EDT
Extended Forecast for

Reston VA

  • Tonight

    Tonight: Isolated showers and thunderstorms before 3am.  Mostly cloudy, with a low around 73. Northwest wind 3 to 5 mph.  Chance of precipitation is 20%.

    Isolated
    T-storms

    Low: 73 °F

  • Saturday

    Saturday: A chance of showers and thunderstorms after 3pm.  Partly sunny, with a high near 93. Heat index values as high as 100. North wind 5 to 7 mph becoming west in the afternoon.  Chance of precipitation is 40%.

    Partly Sunny
    then Chance
    T-storms

    High: 93 °F

  • Saturday
    Night

    Saturday Night: Showers and thunderstorms likely, mainly between 9pm and 3am.  Mostly cloudy, with a low around 74. Southwest wind 5 to 8 mph.  Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    T-storms
    Likely

    Low: 74 °F

  • Sunday

    Sunday: A chance of showers and thunderstorms.  Mostly cloudy, with a high near 94. Heat index values as high as 103. West wind 5 to 9 mph.  Chance of precipitation is 50%.

    Chance
    T-storms

    High: 94 °F

  • Sunday
    Night

    Sunday Night: A chance of showers and thunderstorms before 3am, then a slight chance of showers.  Mostly cloudy, with a low around 74. West wind 5 to 7 mph becoming light and variable  after midnight.  Chance of precipitation is 50%.

    Chance
    T-storms

    Low: 74 °F

  • Monday

    Monday: A slight chance of showers, with thunderstorms also possible after 9am.  Mostly sunny, with a high near 92. Chance of precipitation is 20%.

    Slight Chance
    T-storms

    High: 92 °F

  • Monday
    Night

    Monday Night: Partly cloudy, with a low around 69.

    Partly Cloudy

    Low: 69 °F

  • Tuesday

    Tuesday: Mostly sunny, with a high near 85.

    Mostly Sunny

    High: 85 °F

  • Tuesday
    Night

    Tuesday Night: Mostly clear, with a low around 67.

    Mostly Clear

    Low: 67 °F

Detailed Forecast

Tonight
Isolated showers and thunderstorms before 3am. Mostly cloudy, with a low around 73. Northwest wind 3 to 5 mph. Chance of precipitation is 20%.
Saturday
A chance of showers and thunderstorms after 3pm. Partly sunny, with a high near 93. Heat index values as high as 100. North wind 5 to 7 mph becoming west in the afternoon. Chance of precipitation is 40%.
Saturday Night
Showers and thunderstorms likely, mainly between 9pm and 3am. Mostly cloudy, with a low around 74. Southwest wind 5 to 8 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday
A chance of showers and thunderstorms. Mostly cloudy, with a high near 94. Heat index values as high as 103. West wind 5 to 9 mph. Chance of precipitation is 50%.
Sunday Night
A chance of showers and thunderstorms before 3am, then a slight chance of showers. Mostly cloudy, with a low around 74. West wind 5 to 7 mph becoming light and variable after midnight. Chance of precipitation is 50%.
Monday
A slight chance of showers, with thunderstorms also possible after 9am. Mostly sunny, with a high near 92. Chance of precipitation is 20%.
Monday Night
Partly cloudy, with a low around 69.
Tuesday
Mostly sunny, with a high near 85.
Tuesday Night
Mostly clear, with a low around 67.
Wednesday
Mostly sunny, with a high near 85.
Wednesday Night
Partly cloudy, with a low around 70.
Thursday
A chance of showers and thunderstorms. Partly sunny, with a high near 87. Chance of precipitation is 30%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Friday
A chance of showers and thunderstorms. Partly sunny, with a high near 86. Chance of precipitation is 30%.
Click Map For Forecast
Point Forecast:
Reston VA
 38.95°N 77.36°W (Elev. 446 ft)
7:27 pm EDT Jul 21, 2017
11pm EDT Jul 21, 2017-6pm EDT Jul 28, 2017
 
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Additional Resources

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