Forecast Details for New Derry, PA

Recent Locations: Fulton, KY Coplay, PA New Derry, PA

Today: Scattered showers and thunderstorms, mainly between 4pm and 5pm. Mostly sunny, with a high near 83. Southwest wind 8 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Tonight: Scattered showers and thunderstorms, then showers and possibly a thunderstorm after 2am. Low around 48. South wind 7 to 11 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.

Sunday: Showers, mainly before 7am. High near 57. West wind 10 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Sunday Night: Mostly cloudy, with a low around 35. West wind 9 to 14 mph.

Monday: A chance of showers after 2pm. Partly sunny, with a high near 52. West wind 9 to 17 mph. Chance of precipitation is 40%.

Monday Night: A chance of rain showers, possibly mixing with snow after 11pm, then gradually ending. Mostly cloudy, with a low around 32. Chance of precipitation is 30%.

Tuesday: Partly sunny, with a high near 44.

Tuesday Night: Mostly clear, with a low around 24.

Wednesday: Sunny, with a high near 60.

Wednesday Night: Partly cloudy, with a low around 38.

Thursday: Sunny, with a high near 70.

Thursday Night: Partly cloudy, with a low around 46.

Friday: Mostly 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 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