Thunderstorms and Heavy Rains in the Appalachians

Multiple rounds of moderate to locally heavy rain will impact portions of the Appalachians and Mid-Atlantic, which may lead to flash flooding concerns. Thunderstorms with isolated severe wind gusts will be possible this afternoon from parts of the Southeast into the southern and central Appalachians. A multi-day heavy rain will pose a flash flood threat in New Mexico beginning Tuesday. Read More >

Hazardous Weather Conditions

Current conditions at

Pittsburgh - Allegheny County Airport (KAGC)

Lat: 40.36°NLon: 79.92°WElev: 1237ft.

Overcast

56°F

13°C

Humidity	77%
Wind Speed	NE 6 mph
Barometer	30.07 in (1018.6 mb)
Dewpoint	49°F (9°C)
Visibility	10.00 mi
Last update	21 Sep 11:53 am EDT

More Information:

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

Extended Forecast for

Castle Shannon PA

Flood Watch September 21, 11:58am until September 23, 08:00am

Click here for hazard details and duration

Flood Watch

Flood Watch September 21, 11:58am until September 23, 08:00am
NOW until 8:00am Wed
Flood Watch
Today
High: 63 °F
Showers and
Patchy Fog
Tonight
Low: 57 °F
Showers
Likely
Tuesday
High: 64 °F
Showers
Likely
Tuesday Night
Low: 54 °F
Showers
Likely
Wednesday
High: 62 °F
Showers
Likely
Wednesday Night
Low: 52 °F
Chance
Showers
Thursday
High: 63 °F
Partly Sunny
Thursday Night
Low: 47 °F
Partly Cloudy

Detailed Forecast

Today

Showers and possibly a thunderstorm. Patchy fog. High near 63. Northeast wind around 14 mph, with gusts as high as 24 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight

Showers likely and possibly a thunderstorm. Cloudy, with a low around 57. East wind 13 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tuesday

Showers likely, mainly before 11am. Cloudy, with a high near 64. East wind 13 to 15 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Tuesday Night

Showers likely. Cloudy, with a low around 54. East wind 14 to 16 mph, with gusts as high as 28 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday

Showers likely, mainly before 2pm. Cloudy, with a high near 62. East wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Night

A chance of showers. Mostly cloudy, with a low around 52. Chance of precipitation is 50%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday

Partly sunny, with a high near 63.

Thursday Night

Partly cloudy, with a low around 47.

Friday

Mostly sunny, with a high near 66.

Friday Night

Partly cloudy, with a low around 48.

Saturday

Mostly sunny, with a high near 68.

Saturday Night

Partly cloudy, with a low around 50.