Heat Wave and Severe Thunderstorms this Independence Day

A prolonged, dangerous heat wave will persist through the Independence Day weekend across the Ohio Valley, Midwest, and Mid-Atlantic. Numerous temperature records are expected. Clusters of severe thunderstorms will move across parts of the Allegheny Plateau into Mid Atlantic this Independence Day, with potential for widespread damaging winds. Additional severe thunderstorms in the Great Plains. Read More >

Hazardous Weather Conditions

Current conditions at

Harford County Airport (K0W3)

Lat: 39.57°NLon: 76.2°WElev: 412ft.

Partly Cloudy

95°F

35°C

Humidity	44%
Wind Speed	SE 9 mph
Barometer	29.89 in
Dewpoint	70°F (21°C)
Visibility	10.00 mi
Heat Index	101°F (38°C)
Last update	4 Jul 5:15 pm EDT

More Information:

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

Extended Forecast for

Conowingo MD

Severe T-storm Watch until July 4, 10:00pm

Extreme Heat Warning July 4, 05:33pm until July 4, 09:00pm

Click here for hazard details and duration

Severe T-storm Watch

Extreme Heat Warning

Severe T-storm Watch until July 4, 10:00pm
Extreme Heat Warning July 4, 05:33pm until July 4, 09:00pm
NOW: Multiple hazards in effect
Click HERE for Details
Independence Day
High: 100 °F
Severe
Thunderstorms
Tonight
Low: 72 °F
Severe
Thunderstorms
and Patchy
Fog
Sunday
High: 92 °F
Mostly Sunny
then Chance
T-storms
Sunday Night
Low: 68 °F
Heavy Rain
Monday
High: 81 °F
Showers
Monday Night
Low: 66 °F
Showers
Tuesday
High: 80 °F
Showers
Likely then
Chance
T-storms
Tuesday Night
Low: 64 °F
Chance
T-storms

Detailed Forecast

Independence Day

Scattered showers and thunderstorms. Some of the storms could be severe. Mostly cloudy and hot, with a high near 100. Heat index values as high as 105. Southwest wind around 6 mph. Chance of precipitation is 50%.

Tonight

Showers and thunderstorms before 1am, then a chance of showers. Some of the storms could be severe. Patchy fog between 11pm and 1am. Low around 72. Light and variable wind. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 92. Heat index values as high as 102. Light and variable wind. Chance of precipitation is 30%.

Sunday Night

Showers and thunderstorms before 3am, then a chance of showers between 3am and 5am, then a slight chance of showers and thunderstorms after 5am. Some of the storms could produce heavy rainfall. Low around 68. Northeast wind around 6 mph becoming calm in the evening. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Monday

A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 81. Northeast wind 3 to 6 mph. Chance of precipitation is 100%.

Monday Night

Showers and possibly a thunderstorm before 5am, then showers likely. Low around 66. Chance of precipitation is 90%.

Tuesday

Showers likely, with thunderstorms also possible after 11am. Mostly cloudy, with a high near 80. Chance of precipitation is 60%.

Tuesday Night

A chance of showers and thunderstorms, mainly before 8pm. Mostly cloudy, with a low around 64. Chance of precipitation is 30%.

Wednesday

Mostly sunny, with a high near 84.

Wednesday Night

Partly cloudy, with a low around 67.

Thursday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 20%.