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

Philadelphia - Wings Field Airport (KLOM)

Lat: 40.14°NLon: 75.27°WElev: 282ft.

Fog/Mist

65°F

18°C

Humidity	100%
Wind Speed	Calm
Barometer	29.97 in
Dewpoint	65°F (18°C)
Visibility	5.00 mi
Last update	20 Aug 4:55 am EDT

More Information:

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

Extended Forecast for

2 Miles SSE Montgomeryville PA

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

Click here for hazard details and duration

Flood Watch

Today
High: 80 °F
Slight Chance
T-storms then
T-storms
Tonight
Low: 62 °F
T-storms
Likely then
Patchy Fog
Friday
High: 78 °F
Patchy Fog
then Partly
Sunny
Friday Night
Low: 64 °F
Slight Chance
Showers then
Showers
Likely
Saturday
High: 78 °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 80. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

Tonight

Showers and thunderstorms likely, mainly before 9pm. Patchy fog between 1am and 2am. Otherwise, mostly cloudy, with a low around 62. Northeast wind 5 to 10 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Friday

Patchy fog between 7am and 8am. Otherwise, partly sunny, with a high near 78. Northeast wind around 5 mph.

Friday Night

A slight chance of showers, then showers likely and possibly a thunderstorm after 2am. Mostly cloudy, 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 78. 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 30%. New precipitation amounts of less than a tenth 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 79.

Tuesday Night

Mostly clear, with a low around 61.