Dangerous Heat Wave Continues; Severe Thunderstorms and Heavy Rain from the Central Plains to the Midwest

A prolonged, dangerous heat wave will continue today in the Midwest and Mississippi Valley, and persist through the Independence Day weekend across the Ohio Valley, Mid-South, and East Coast. Severe thunderstorm are expected from the northern/central Plains to the Mid-Atlantic. Isolated slash flooding is possible from the central Plains to the Upper Midwest. Read More >

Hazardous Weather Conditions

Extreme Heat Warning in effect from July 4, 10:00 AM EDT until July 4, 09:00 PM EDT

Current conditions at

Frederick Municipal Airport (KFDK)

Lat: 39.42°NLon: 77.37°WElev: 269ft.

Fair

82°F

28°C

Humidity	83%
Wind Speed	S 3 mph
Barometer	30.02 in
Dewpoint	76°F (24°C)
Visibility	10.00 mi
Heat Index	90°F (32°C)
Last update	3 Jul 11:55 pm EDT

More Information:

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

Extended Forecast for

Frederick MD

Extreme Heat Warning July 4, 10:00am until July 4, 09:00pm

Click here for hazard details and duration

Extreme Heat Warning

Overnight
Low: 78 °F
Mostly Clear
Independence Day
High: 100 °F
Sunny then
Slight Chance
T-storms
Saturday Night
Low: 73 °F
Chance
T-storms
Sunday
High: 93 °F
Mostly Sunny
then Showers
Sunday Night
Low: 71 °F
Showers
Monday
High: 85 °F
Chance
Showers then
T-storms
Monday Night
Low: 70 °F
T-storms then
Showers
Likely
Tuesday
High: 86 °F
Slight Chance
T-storms then
Chance
T-storms
Tuesday Night
Low: 69 °F
Chance
T-storms then
Chance
Showers

Detailed Forecast

Overnight

Mostly clear, with a low around 78. Light and variable wind.

Independence Day

A slight chance of showers and thunderstorms between 2pm and 3pm. Sunny and hot, with a high near 100. Heat index values as high as 106. Calm wind becoming west 5 to 9 mph in the afternoon. Winds could gust as high as 18 mph. Chance of precipitation is 20%.

Saturday Night

A chance of showers and thunderstorms before 2am. Mostly cloudy, with a low around 73. Light and variable wind. Chance of precipitation is 40%.

Sunday

Showers and possibly a thunderstorm after 2pm. High near 93. Heat index values as high as 103. Light and variable wind. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Sunday Night

Showers and possibly a thunderstorm before 2am, then a chance of showers. Low around 71. Calm wind. Chance of precipitation is 80%.

Monday

A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers and possibly a thunderstorm after 2pm. High near 85. Chance of precipitation is 80%.

Monday Night

Showers and possibly a thunderstorm before 2am, then a slight chance of showers. Low around 70. Chance of precipitation is 80%.

Tuesday

A slight chance of showers, then a chance of showers and thunderstorms after 8am. Partly sunny, with a high near 86. Chance of precipitation is 50%.

Tuesday 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 40%.

Wednesday

A chance of showers, mainly after 8am. Partly sunny, with a high near 87. Chance of precipitation is 30%.

Wednesday Night

A slight chance of showers and thunderstorms. Partly cloudy, with a low around 70. Chance of precipitation is 20%.

Thursday

A slight chance of showers and thunderstorms. Mostly sunny, with a high near 91. Chance of precipitation is 20%.

Thursday Night

A chance of showers and thunderstorms. Partly cloudy, with a low around 71. Chance of precipitation is 30%.

Friday

A chance of showers and thunderstorms. Mostly sunny, with a high near 90. Chance of precipitation is 40%.