Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Hazardous Weather Conditions

Flood Watch in effect from August 20, 12:00 PM EDT until August 21, 02:00 AM EDT

Current conditions at

Chester County Airport (KMQS)

Lat: 39.98°NLon: 75.87°WElev: 659ft.

Fair

71°F

22°C

Humidity	91%
Wind Speed	NW 5 mph
Barometer	29.97 in
Dewpoint	68°F (20°C)
Visibility	10.00 mi
Last update	19 Aug 11:55 pm EDT

More Information:

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

Extended Forecast for

2 Miles ENE Parkesburg PA

Flood Watch August 20, 12:00pm until August 21, 02:00am

Click here for hazard details and duration

Flood Watch

Overnight
Low: 67 °F
Mostly Clear
Thursday
High: 77 °F
Chance
Showers then
Heavy Rain
Thursday Night
Low: 63 °F
Heavy Rain
then Mostly
Cloudy
Friday
High: 78 °F
Mostly Sunny
then Chance
Showers
Friday Night
Low: 64 °F
Chance
Showers
Saturday
High: 78 °F
Chance
Showers then
Showers
Likely
Saturday Night
Low: 65 °F
Showers
Likely
Sunday
High: 80 °F
Partly Sunny
then Chance
T-storms
Sunday Night
Low: 62 °F
Chance
T-storms then
Mostly Clear

Detailed Forecast

Overnight

Mostly clear, with a low around 67. Calm wind.

Thursday

A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. Some of the storms could produce heavy rainfall. High near 77. Calm wind becoming southeast around 5 mph in the afternoon. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night

Showers likely and possibly a thunderstorm before 8pm, then a slight chance of showers between 8pm and 10pm. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 63. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday

A chance of showers after 2pm. Partly sunny, with a high near 78. Northeast wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night

A chance of showers, mainly after 2am. Mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Saturday

A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 78. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night

Showers likely and possibly a thunderstorm before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 60%.

Sunday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Chance of precipitation is 40%.

Sunday Night

A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 62. Chance of precipitation is 30%.

Monday

Sunny, with a high near 78.

Monday Night

Mostly clear, with a low around 60.

Tuesday

Sunny, with a high near 78.

Tuesday Night

Partly cloudy, with a low around 62.