National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Severe Thunderstorm and Tropical Storm Bertha Impacts

Numerous severe thunderstorms are expected across a broad region from the Ohio Valley to the Mid-Atlantic and Northeast States today into tonight. Swaths of damaging wind gusts are expected and some tornadoes are possible. Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the Florida Panhandle westward to southeastern Louisiana later today and Wednesday. Read More >

Hazardous Weather Conditions

Current conditions at

Philadelphia, Philadelphia International Airport (KPHL)

Lat: 39.87°NLon: 75.23°WElev: 7ft.

Thunderstorm Light Rain and Breezy

80°F

27°C

Humidity 64%
Wind Speed NW 22 G 30 mph
Barometer 29.74 in (1006.9 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 21 Jul 4:54 pm EDT
Extended Forecast for

Colwyn PA

Flood Watch July 21, 05:03pm until July 22, 02:00am
Tornado Watch July 21, 05:03pm until July 21, 09:00pm
Flash Flood Warning until July 21, 08:45pm
Severe T-storm Warning until July 21, 05:30pm
Severe T-storm Warning July 21, 05:03pm until July 21, 05:15pm
Click here for hazard details and duration
Flood Watch
Tornado Watch
Flash Flood Warning
Severe T-storm Warning
Severe T-storm Warning
  •  
    Flood Watch July 21, 05:03pm until July 22, 02:00am
    Tornado Watch July 21, 05:03pm until July 21, 09:00pm
    Flash Flood Warning until July 21, 08:45pm
    Severe T-storm Warning until July 21, 05:30pm
    Severe T-storm Warning July 21, 05:03pm until July 21, 05:15pm

    NOW: Multiple hazards in effect

    Click HERE for Details

  • This Afternoon

    High: 86 °F

    Severe
    Thunderstorms

  • Tonight

    Tonight: Showers and thunderstorms, mainly before 10pm, then a chance of thunderstorms after 5am. Some of the storms could be severe. Low around 72. Southwest wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

    Low: 72 °F

    Severe
    Thunderstorms
    then Chance
    T-storms

  • Wednesday

    Wednesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. West wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 85 °F

    Mostly Sunny
    then Chance
    Showers

  • Wednesday Night

    Wednesday Night: A chance of showers, mainly between 10pm and midnight. Partly cloudy, with a low around 65. West wind around 5 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

    Low: 65 °F

    Chance
    Showers then
    Partly Cloudy

  • Thursday

    Thursday: Sunny, with a high near 81. North wind around 5 mph.

    High: 81 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 63.

    Low: 63 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 83.

    High: 83 °F

    Sunny

  • Friday Night

    Friday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

Detailed Forecast

This Afternoon
A chance of showers and thunderstorms. Some of the storms could be severe. Cloudy, with a high near 86. South wind around 10 mph. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
Showers and thunderstorms, mainly before 10pm, then a chance of thunderstorms after 5am. Some of the storms could be severe. Low around 72. Southwest wind around 10 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday
A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 85. West wind around 10 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday Night
A chance of showers, mainly between 10pm and midnight. Partly cloudy, with a low around 65. West wind around 5 mph becoming north after midnight. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.
Thursday
Sunny, with a high near 81. North wind around 5 mph.
Thursday Night
Clear, with a low around 63.
Friday
Sunny, with a high near 83.
Friday Night
Partly cloudy, with a low around 64.
Saturday
Mostly sunny, with a high near 82.
Saturday Night
Partly cloudy, with a low around 65.
Sunday
Mostly sunny, with a high near 85.
Sunday Night
A chance of showers. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Monday
A chance of showers and thunderstorms. Mostly sunny, with a high near 88. Chance of precipitation is 50%.
Monday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 30%.
Tuesday
A chance of showers. Mostly sunny, with a high near 86.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Colwyn PA
 39.92°N 75.25°W (Elev. 75 ft)
Last Update:
4:08 pm EDT Jul 21, 2026
Forecast Valid:
5pm EDT Jul 21, 2026-6pm EDT Jul 28, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation