Forecast Details for Williamsport, PA

Recent Locations: Lyons, NE Canaseraga, NY Williamsport, PA

Overnight: A chance of showers, mainly before 5am. Cloudy, with a low around 37. Breezy, with a west wind 17 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Thursday: A chance of rain and snow showers before 10am, then a slight chance of snow showers between 10am and 11am. Cloudy, then gradually becoming mostly sunny, with a high near 42. Breezy, with a northwest wind 16 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Night: Mostly clear, with a low around 27. West wind 8 to 13 mph becoming light after midnight. Winds could gust as high as 22 mph.

Friday: A chance of snow showers before 11am, then a chance of rain and snow showers between 11am and 5pm, then a chance of rain showers after 5pm. Mostly cloudy, with a high near 48. Breezy, with a south wind 5 to 10 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 40%. New precipitation amounts of less than a tenth of an inch possible.

Friday Night: A chance of rain showers, possibly mixing with snow after 11pm, then gradually ending. Mostly cloudy, with a low around 32. Breezy, with a west wind 14 to 20 mph, with gusts as high as 36 mph. Chance of precipitation is 30%. New precipitation amounts of less than a tenth of an inch possible.

Saturday: Mostly sunny, with a high near 47.

Saturday Night: A chance of snow showers after 2am. Mostly cloudy, with a low around 30. Chance of precipitation is 30%.

Sunday: A chance of snow showers before 8am. Cloudy, with a high near 50. Chance of precipitation is 30%.

Sunday Night: Showers likely, mainly after 2am. Cloudy, with a low around 45. Chance of precipitation is 70%.

Monday: Showers. High near 61. Breezy. Chance of precipitation is 80%.

Monday Night: Rain and snow showers likely. Mostly cloudy, with a low around 24. Chance of precipitation is 60%.

Tuesday: Partly sunny, with a high near 34.

Tuesday Night: Mostly cloudy, with a low around 19.

Wednesday: Mostly sunny, with a high near 38.

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Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain