Thunderstorms and Heavy Rainfall from the Plains to the Mid-Atlantic

Severe thunderstorms producing damaging winds are most likely over parts of the Dakotas into Minnesota from this afternoon into the overnight, with other isolated storms producing hail or wind over the northern High Plains. In the Northern Plains into the Upper Great Lakes and Mid-Atlantic, heavy to excessive rain may bring flash and urban flooding through Wednesday. Read More >

Hazardous Weather Conditions

Hazardous Weather Outlook

Current conditions at

Gaithersburg - Montgomery County Airport (KGAI)

Lat: 39.17°NLon: 77.17°WElev: 495ft.

Overcast

78°F

26°C

Humidity	90%
Wind Speed	Vrbl 3 mph
Barometer	30.04 in (1018.0 mb)
Dewpoint	75°F (24°C)
Visibility	10.00 mi
Heat Index	80°F (27°C)
Last update	7 Jul 1:56 pm EDT

More Information:

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

Extended Forecast for

Olney MD

This Afternoon
High: 82 °F
Scattered
Showers
Tonight
Low: 68 °F
Showers
Likely then
Scattered
Showers and
Patchy Fog
Wednesday
High: 81 °F
Chance
Showers and
Patchy Fog
then Partly
Sunny
Wednesday Night
Low: 70 °F
Slight Chance
T-storms then
Showers
Likely
Thursday
High: 85 °F
Showers
Likely then
T-storms
Thursday Night
Low: 69 °F
Showers then
Slight Chance
Showers
Friday
High: 88 °F
Mostly Sunny
then Chance
T-storms
Friday Night
Low: 69 °F
Chance
T-storms
Saturday
High: 84 °F
Chance
Showers then
Chance
T-storms

Detailed Forecast

This Afternoon

Isolated showers, then scattered showers and thunderstorms after 3pm. Mostly cloudy, with a high near 82. Light east wind. Chance of precipitation is 30%.

Tonight

Showers and thunderstorms likely before 2am, then scattered showers. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 68. East wind 3 to 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday

A chance of showers, mainly before 8am. Patchy fog before 10am. Otherwise, mostly cloudy, with a high near 81. East wind 3 to 5 mph. Chance of precipitation is 30%.

Wednesday Night

A slight chance of showers and thunderstorms before 2am, then showers likely between 2am and 5am, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 70. Light south wind. Chance of precipitation is 70%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday

Showers likely and possibly a thunderstorm before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 85. South wind around 6 mph. Chance of precipitation is 90%.

Thursday Night

Showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Low around 69. Chance of precipitation is 80%.

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, then a slight chance of showers. Mostly cloudy, with a low around 69. Chance of precipitation is 30%.

Saturday

A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 40%.

Saturday Night

A chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 66. Chance of precipitation is 30%.

Sunday

A chance of showers and thunderstorms. Mostly sunny, with a high near 81. Chance of precipitation is 30%.

Sunday Night

A chance of showers and thunderstorms. Mostly cloudy, with a low around 65. Chance of precipitation is 30%.

Monday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 83. Chance of precipitation is 20%.