Forecast Details for Grantham, PA

Recent Locations: Taylor, MI Arab, AL Grantham, PA

Today: A slight chance of showers before 1pm, then a slight chance of showers after 5pm. Cloudy, with a high near 54. East wind 5 to 9 mph. Chance of precipitation is 20%.

Tonight: A slight chance of showers between 10pm and 11pm. Cloudy, with a low around 46. East wind 6 to 10 mph. Chance of precipitation is 20%.

Friday: A slight chance of showers between 2pm and 5pm, then a slight chance of showers and thunderstorms after 5pm. Partly sunny, with a high near 79. South wind 5 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 20%.

Friday Night: A slight chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Mostly cloudy, with a low around 60. Southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 20%.

Saturday: A slight chance of showers between 8am and 2pm, then a chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 80. Light and variable wind becoming south 5 to 10 mph in the afternoon. Chance of precipitation is 50%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Saturday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am, then rain likely after 2am. Mostly cloudy, with a low around 58. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Sunday: Rain likely before 2pm. Mostly cloudy, with a high near 64. Chance of precipitation is 70%.

Sunday Night: Partly cloudy, with a low around 37.

Monday: Mostly sunny, with a high near 56.

Monday Night: Partly cloudy, with a low around 36.

Tuesday: Partly sunny, with a high near 52.

Tuesday Night: Mostly clear, with a low around 28.

Wednesday: Sunny, with a high near 53.

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Current U.S. National Radar--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 Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds