Forecast Details for Mount Gretna, PA

Recent Locations: Mount Gretna, PA  
Tonight: Showers and thunderstorms, mainly before 2am. Low around 53. East wind 7 to 13 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday: Mostly cloudy, with a high near 61. Northeast wind 7 to 9 mph.
Thursday Night: Mostly cloudy, with a low around 44. East wind 9 to 11 mph.
Friday: Showers likely, mainly after 2pm. Mostly cloudy, with a high near 62. Southeast wind around 11 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Friday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 48. South wind around 9 mph becoming west after midnight. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Saturday: Partly sunny, with a high near 61.
Saturday Night: Partly cloudy, with a low around 40.
Sunday: Partly sunny, with a high near 58.
Sunday Night: Partly cloudy, with a low around 40.
Monday: Sunny, with a high near 62.
Monday Night: Partly cloudy, with a low around 42.
Tuesday: Partly sunny, with a high near 65.
Tuesday Night: A chance of showers. Mostly cloudy, with a low around 48. Chance of precipitation is 40%.
Wednesday: A chance of showers. Partly sunny, with a high near 63. Chance of precipitation is 30%.

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Current U.S. National Radar--Current

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Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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North America Water Vapor (Moisture)

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North American Water Vapor Map

Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

Graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail

Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds