Forecast Details for Berwyn, PA

Recent Locations: Reserve, LA Glade Valley, NC Berwyn, PA

Tonight: Mostly clear, with a low around 68. South wind 10 to 15 mph.

Saturday: Showers and thunderstorms likely, mainly after 4pm. Partly sunny, with a high near 85. Southwest wind 5 to 15 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: Showers and thunderstorms likely before 8pm, then showers likely and possibly a thunderstorm between 8pm and 2am, then a chance of showers and thunderstorms after 2am. Some of the storms could be severe. Cloudy, with a low around 59. Northwest wind 5 to 10 mph becoming light north. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Sunday: A chance of showers, mainly before 8am. Cloudy, then gradually becoming mostly sunny, with a high near 72. Northwest wind around 5 mph. Chance of precipitation is 30%. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday Night: Mostly clear, with a low around 52. Northwest wind around 5 mph.

Monday: Sunny, with a high near 73.

Monday Night: Mostly clear, with a low around 52.

Tuesday: Sunny, with a high near 75.

Tuesday Night: Partly cloudy, with a low around 55.

Wednesday: Mostly cloudy, with a high near 73.

Wednesday Night: Mostly cloudy, with a low around 55.

Thursday: Sunny, with a high near 80.

Thursday Night: Mostly clear, with a low around 54.

Friday: Sunny, with a high near 73.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds