Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, 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.

Fair

82°F

28°C

Humidity	52%
Wind Speed	W 3 mph
Barometer	29.92 in
Dewpoint	63°F (17°C)
Visibility	10.00 mi
Heat Index	83°F (28°C)
Last update	19 Aug 5:35 pm EDT

More Information:

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

Extended Forecast for

Horsham PA

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

Click here for hazard details and duration

Flood Watch

Tonight
Low: 68 °F
Mostly Clear
Thursday
High: 81 °F
Chance
Showers then
Showers
Thursday Night
Low: 64 °F
Showers then
Slight Chance
Showers
Friday
High: 81 °F
Partly Sunny
then Chance
Showers
Friday Night
Low: 65 °F
Chance
Showers
Saturday
High: 81 °F
Chance
Showers then
Showers
Likely
Saturday Night
Low: 67 °F
Showers
Likely
Sunday
High: 83 °F
Partly Sunny
then Chance
T-storms
Sunday Night
Low: 64 °F
Chance
T-storms then
Mostly Clear

Detailed Forecast

Tonight

Mostly clear, with a low around 68. West wind around 5 mph becoming calm in the evening.

Thursday

A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 2pm. High near 81. 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 and possibly a thunderstorm before 11pm, then a slight chance of showers between 11pm and 2am. Low around 64. Northeast wind around 5 mph becoming calm. Chance of precipitation is 80%. 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 81. 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. Mostly cloudy, with a low around 65. Northeast wind around 5 mph becoming calm. 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 81. Chance of precipitation is 70%. 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 67. Chance of precipitation is 60%.

Sunday

A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 83. Chance of precipitation is 40%.

Sunday Night

A chance of showers and thunderstorms before 8pm. Mostly clear, with a low around 64. Chance of precipitation is 30%.

Monday

Sunny, with a high near 81.

Monday Night

Mostly clear, with a low around 62.

Tuesday

Sunny, with a high near 81.

Tuesday Night

Partly cloudy, with a low around 63.