Forecast Details for Keystone, SD

Recent Locations: Keystone, SD

Today: Mostly cloudy through mid morning, then gradual clearing, with a high near 53. Northwest wind 10 to 14 mph, with gusts as high as 34 mph.

Tonight: Partly cloudy, with a low around 31. Northwest wind 5 to 9 mph becoming calm in the evening. Winds could gust as high as 25 mph.

Thursday: Mostly sunny, with a high near 55. Calm wind becoming northeast 5 to 8 mph in the morning. Winds could gust as high as 23 mph.

Thursday Night: Mostly clear, with a low around 30. Northeast wind 5 to 7 mph becoming calm in the evening. Winds could gust as high as 22 mph.

Friday: Mostly sunny, with a high near 56. Light south wind increasing to 5 to 10 mph in the morning. Winds could gust as high as 31 mph.

Friday Night: Mostly cloudy, with a low around 45. South wind 7 to 10 mph, with gusts as high as 30 mph.

Saturday: A 20 percent chance of showers after noon. Partly sunny, with a high near 76. Southwest wind around 9 mph, with gusts as high as 29 mph.

Saturday Night: A chance of showers before midnight. Mostly cloudy, with a low around 51. West wind 6 to 8 mph, with gusts as high as 23 mph.

Sunday: A chance of showers, mainly after noon. Partly sunny, with a high near 72.

Sunday Night: A chance of showers. Partly cloudy, with a low around 44.

Monday: Showers likely. Partly sunny, with a high near 57.

Monday Night: Rain and snow showers likely. Mostly cloudy, with a low around 29.

Tuesday: A chance of rain and snow showers. Partly sunny, with a high near 47.

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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 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