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

Pottstown, Pottstown Limerick Airport (KPTW)

Lat: 40.24°NLon: 75.55°WElev: 288ft.

Fog/Mist

64°F

18°C

Humidity	100%
Wind Speed	Calm
Barometer	29.98 in (1014.9 mb)
Dewpoint	64°F (18°C)
Visibility	5.00 mi
Last update	20 Aug 5:54 am EDT

More Information:

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

Extended Forecast for

2 Miles NW Malvern PA

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

Click here for hazard details and duration

Flood Watch

Today
High: 79 °F
Slight Chance
T-storms then
T-storms
Tonight
Low: 62 °F
T-storms
Likely then
Mostly Cloudy
Friday
High: 79 °F
Mostly Sunny
Friday Night
Low: 64 °F
Chance
Showers then
Showers
Likely
Saturday
High: 79 °F
Showers
Likely
Saturday Night
Low: 65 °F
Chance
T-storms then
Chance
Showers
Sunday
High: 82 °F
Partly Sunny
then Chance
Showers
Sunday Night
Low: 62 °F
Chance
Showers then
Mostly Clear
Monday
High: 79 °F
Sunny

Detailed Forecast

Today

Showers and thunderstorms, mainly after 2pm. High near 79. Calm wind becoming east around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Tonight

Showers and thunderstorms likely, mainly before 8pm. Mostly cloudy, with a low around 62. North wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Mostly sunny, with a high near 79. North wind around 5 mph.

Friday Night

A chance of showers before 11pm, then a chance of showers and thunderstorms between 11pm and 2am, then showers likely and possibly a thunderstorm after 2am. Increasing clouds, with a low around 64. East wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday

Showers likely and possibly a thunderstorm. Mostly cloudy, with a high near 79. East wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Saturday Night

A chance of showers and thunderstorms before 11pm, then a chance of showers between 11pm and 2am. Mostly cloudy, with a low around 65. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday

A chance of showers after 2pm. Partly sunny, with a high near 82. Chance of precipitation is 40%.

Sunday Night

A chance of showers before 8pm. Partly cloudy, with a low around 62. Chance of precipitation is 30%.

Monday

Sunny, with a high near 79.

Monday Night

Mostly clear, with a low around 60.

Tuesday

Sunny, with a high near 80.

Tuesday Night

Mostly clear, with a low around 61.