Forecast Details for New Derry, PA

Recent Locations: Hamilton, VA Buckingham, IL New Derry, PA

This Afternoon: Mostly sunny, with a high near 83. Southwest wind 13 to 15 mph.

Tonight: Showers and thunderstorms likely before 2am, then a slight chance of showers. Mostly cloudy, with a low around 58. Southwest wind 3 to 8 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: Mostly cloudy, then gradually becoming sunny, with a high near 75. Northwest wind around 6 mph.

Friday Night: Partly cloudy, with a low around 56. Calm wind.

Saturday: Showers likely, with thunderstorms also possible after 5pm. Partly sunny, with a high near 83. Southwest wind 6 to 14 mph, with gusts as high as 24 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night: Showers and possibly a thunderstorm before 2am, then showers likely. Low around 42. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Sunday: Showers likely, mainly before 8am. Mostly cloudy, with a high near 53. Chance of precipitation is 60%.

Sunday Night: Mostly cloudy, with a low around 31.

Monday: Mostly sunny, with a high near 48.

Monday Night: Mostly clear, with a low around 29.

Tuesday: Mostly sunny, with a high near 68.

Tuesday Night: A chance of showers. Mostly cloudy, with a low around 49. Chance of precipitation is 30%.

Wednesday: A chance of showers. Partly sunny, with a high near 68. 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)

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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