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.

Fair

81°F

27°C

Humidity	57%
Wind Speed	Calm
Barometer	29.94 in (1013.3 mb)
Dewpoint	64°F (18°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	19 Aug 6:54 pm EDT

More Information:

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

Extended Forecast for

4 Miles ENE Saint Peters PA

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

Click here for hazard details and duration

Flood Watch

Tonight
Low: 66 °F
Mostly Clear
Thursday
High: 78 °F
Chance
Showers then
Showers
Thursday Night
Low: 61 °F
Showers
Likely then
Mostly Cloudy
Friday
High: 80 °F
Mostly Sunny
then Chance
Showers
Friday Night
Low: 64 °F
Chance
Showers
Saturday
High: 80 °F
Slight Chance
Showers then
Showers
Likely
Saturday Night
Low: 65 °F
Showers
Likely
Sunday
High: 81 °F
Partly Sunny
then Chance
T-storms
Sunday Night
Low: 62 °F
Chance
T-storms then
Mostly Clear

Detailed Forecast

Tonight

Mostly clear, with a low around 66. West wind around 5 mph becoming calm.

Thursday

Showers and thunderstorms likely, then showers and possibly a thunderstorm after 3pm. High near 78. Calm wind becoming south 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 and thunderstorms likely before 8pm, then a slight chance of showers between 8pm and 9pm. Mostly cloudy, with a low around 61. North wind around 5 mph becoming calm. 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 80. 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 before 8pm. 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 slight chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 80. Chance of precipitation is 60%. New rainfall amounts of less than a tenth 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 81. 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 79.

Monday Night

Mostly clear, with a low around 60.

Tuesday

Sunny, with a high near 79.

Tuesday Night

Partly cloudy, with a low around 61.