Forecast Details for Williamstown, PA

Recent Locations: New Canaan, CT Allen, MD Williamstown, PA

Overnight: A chance of rain. Cloudy, with a low around 59. West wind around 10 mph. Chance of precipitation is 50%. New precipitation amounts of less than a tenth of an inch possible.

Wednesday: Rain and thunderstorms likely before 2pm, then showers and possibly a thunderstorm between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. High near 71. West wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Showers and thunderstorms before 2am, then showers likely. Patchy fog after 2am. Low around 51. Northeast wind around 6 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers, mainly before 2pm. Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 53. Southeast wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Night: A slight chance of showers before 2am. Cloudy, with a low around 45. Southeast wind 8 to 10 mph, with gusts as high as 24 mph. Chance of precipitation is 20%.

Friday: A chance of showers between 2pm and 5pm, then a chance of showers and thunderstorms after 5pm. Mostly cloudy, with a high near 75. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Friday Night: A chance of showers before 8pm. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.

Saturday: A chance of showers after 2pm. Partly sunny, with a high near 79. Chance of precipitation is 40%.

Saturday Night: A chance of showers. Mostly cloudy, with a low around 56. Chance of precipitation is 50%.

Sunday: Showers. High near 66. Chance of precipitation is 80%.

Sunday Night: Showers likely. Mostly cloudy, with a low around 36. Chance of precipitation is 60%.

Monday: Mostly sunny, with a high near 53.

Monday Night: Partly cloudy, with a low around 35.

Tuesday: A chance of showers. Partly sunny, with a high near 53. Chance of precipitation is 30%.

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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)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Cirrocumulus Clouds?

Home - Education - Cloud Types - Cirrocumulus Clouds

Next Topic: Cirrostratus Clouds

Cirrocumulus clouds form at high altitudes (usually around 5 km) and have distinguishing characteristics displayed in a fine layer of small cloud patches. These small cloud patches are sometimes referred to as "cloudlets" in relation to the whole cloud formation.

Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the water droplets in the cloud freeze into ice crystals and the cloud becomes a cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud formations generally pass rapidly.

Next Topic: Cirrostratus Clouds

Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation