Heavy Rain in the Southern Appalachians; Heat Continues in the West; Monitoring Tropical Storm Erin

Heavy to excessive rain falling over the southern Appalachians may bring areas of flooding into Wednesday. Hot temperatures are in place through Wednesday across parts of the western U.S. and New England. Tropical Storm Erin is forecast to become a Hurricane by late this week as it moves westward across the central Atlantic Ocean. Monitor forecasts for any Puerto Rico or U.S. East Coast impacts. Read More >

Current conditions at

Philadelphia - Wings Field Airport (KLOM)

Lat: 40.14°NLon: 75.27°WElev: 282ft.

Fair

71°F

22°C

Humidity	98%
Wind Speed	SW 3 mph
Barometer	29.98 in
Dewpoint	71°F (22°C)
Visibility	10.00 mi
Last update	13 Aug 1:55 am EDT

More Information:

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

Extended Forecast for

Horsham PA

Overnight
Low: 70 °F
Patchy Fog
Wednesday
High: 91 °F
Patchy Fog
then Heavy
Rain
Wednesday Night
Low: 72 °F
Heavy Rain
then Chance
T-storms
Thursday
High: 87 °F
Chance
T-storms then
Showers
Likely
Thursday Night
Low: 69 °F
Showers
Likely then
Slight Chance
Showers
Friday
High: 88 °F
Sunny then
Slight Chance
Showers
Friday Night
Low: 67 °F
Partly Cloudy
Saturday
High: 88 °F
Sunny
Saturday Night
Low: 68 °F
Mostly Clear

Detailed Forecast

Overnight

Patchy fog after 5am. Otherwise, partly cloudy, with a low around 70. Calm wind.

Wednesday

A chance of showers before 2pm, then a chance of showers and thunderstorms between 2pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Some of the storms could produce heavy rainfall. Patchy fog before 8am. Otherwise, partly sunny, with a high near 91. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a half and three quarters of an inch possible.

Wednesday Night

Showers and thunderstorms likely before 5am, then a chance of showers. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 72. Southwest wind around 5 mph becoming calm. Chance of precipitation is 60%. New rainfall amounts between a quarter and half of an inch possible.

Thursday

A chance of showers before 8am, then a chance of showers and thunderstorms between 8am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 87. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday Night

Showers likely, mainly before 8pm. Partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday

A slight chance of showers after 2pm. Sunny, with a high near 88. Chance of precipitation is 20%.

Friday Night

Partly cloudy, with a low around 67.

Saturday

Sunny, with a high near 88.

Saturday Night

Mostly clear, with a low around 68.

Sunday

Sunny, with a high near 92.

Sunday Night

Partly cloudy, with a low around 71.