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

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

A Few Clouds

94°F

34°C

Humidity	46%
Wind Speed	Vrbl 3 mph
Barometer	29.97 in (1015.7 mb)
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Heat Index	100°F (38°C)
Last update	30 Jul 4:56 pm EDT

More Information:

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

Extended Forecast for

Olney MD

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

Heat Advisory until July 30, 08:00pm

Click here for hazard details and duration

Flood Watch

Heat Advisory

Heat Advisory until July 30, 08:00pm
NOW until 8:00pm Wed
Heat Advisory
This Afternoon
High: 94 °F
Mostly Sunny
Tonight
Low: 75 °F
Partly Cloudy
Thursday
High: 92 °F
Slight Chance
T-storms then
T-storms
Likely
Thursday Night
Low: 67 °F
T-storms then
Showers
Friday
High: 74 °F
Chance
Showers then
Chance
T-storms
Friday Night
Low: 61 °F
Slight Chance
T-storms then
Slight Chance
Showers
Saturday
High: 79 °F
Sunny
Saturday Night
Low: 60 °F
Mostly Clear

Detailed Forecast

This Afternoon

Mostly sunny, with a high near 94. Heat index values as high as 100. South wind around 5 mph.

Tonight

Partly cloudy, with a low around 75. Light south wind.

Thursday

Showers and thunderstorms likely, mainly after 5pm. Increasing clouds, with a high near 92. Heat index values as high as 101. Calm wind becoming south around 6 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between 1 and 2 inches possible.

Thursday Night

Showers and possibly a thunderstorm before 2am, then a chance of showers and thunderstorms after 2am. Low around 67. Northeast wind around 6 mph. Chance of precipitation is 80%. New rainfall amounts between three quarters and one inch possible.

Friday

A chance of showers and thunderstorms before 8am, then a chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 74. North wind 7 to 10 mph, with gusts as high as 18 mph. Chance of precipitation is 50%.

Friday Night

A slight chance of showers and thunderstorms before 8pm, then a slight chance of showers between 8pm and 2am. Partly cloudy, with a low around 61. Chance of precipitation is 20%.

Saturday

Sunny, with a high near 79.

Saturday Night

Mostly clear, with a low around 60.

Sunday

Mostly sunny, with a high near 81.

Sunday Night

Partly cloudy, with a low around 61.

Monday

Mostly sunny, with a high near 82.

Monday Night

Partly cloudy, with a low around 64.