Heat and Severe Thunderstorms in the Eastern U.S.

A widespread heat wave will peak over the South and East today, with several dozen temperature records expected along the East Coast. Heat should begin to ease this weekend in the Northeast, while hazardous heat continues over the South. Severe thunderstorms capable of damaging winds are possible across parts of the Appalachians, Mid Atlantic, and Northeast this afternoon and evening. Read More >

Hazardous Weather Conditions

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Fair

91°F

33°C

Humidity	52%
Wind Speed	NW 10 G 17 mph
Barometer	29.83 in (1011.1 mb)
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Heat Index	98°F (37°C)
Last update	12 Jun 12:56 pm EDT

More Information:

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

Extended Forecast for

Derwood MD

Heat Advisory until June 12, 08:00pm

Click here for hazard details and duration

Heat Advisory

Heat Advisory until June 12, 08:00pm
NOW until 8:00pm Fri
Heat Advisory
This Afternoon
High: 95 °F
Severe
Thunderstorms
Tonight
Low: 65 °F
Severe
Thunderstorms
then Partly
Cloudy
Saturday
High: 86 °F
Sunny
Saturday Night
Low: 66 °F
Partly Cloudy
Sunday
High: 90 °F
Slight Chance
Showers then
Showers
Likely
Sunday Night
Low: 63 °F
Showers
Likely then
Mostly Cloudy
Monday
High: 79 °F
Mostly Sunny
Monday Night
Low: 60 °F
Partly Cloudy
then Slight
Chance
Showers

Detailed Forecast

This Afternoon

A chance of showers and thunderstorms after 2pm. Some of the storms could be severe. Mostly sunny, with a high near 95. Heat index values as high as 105. West wind around 8 mph. Chance of precipitation is 40%.

Tonight

A chance of showers and thunderstorms before 8pm. Some of the storms could be severe. Cloudy, then gradually becoming partly cloudy, with a low around 65. Northwest wind 5 to 7 mph. Chance of precipitation is 30%.

Saturday

Sunny, with a high near 86. West wind 3 to 5 mph.

Saturday Night

Partly cloudy, with a low around 66. Calm wind.

Sunday

Showers likely and possibly a thunderstorm, mainly after 2pm. Partly sunny, with a high near 90. South wind 6 to 11 mph, with gusts as high as 22 mph. Chance of precipitation is 70%.

Sunday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm. Mostly cloudy, with a low around 63. Chance of precipitation is 60%.

Monday

Mostly sunny, with a high near 79.

Monday Night

A slight chance of showers after 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 20%.

Tuesday

A slight chance of showers. Partly sunny, with a high near 78. Chance of precipitation is 20%.

Tuesday Night

A slight chance of showers before 2am. Mostly cloudy, with a low around 60. Chance of precipitation is 20%.

Wednesday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 84. Chance of precipitation is 20%.

Wednesday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 64. Chance of precipitation is 20%.