Forecast Details for Keystone, SD

Recent Locations: Addison, TX Reading, MA Keystone, SD

Tonight: Partly cloudy, with a low around 31. Northwest wind 5 to 8 mph becoming calm in the evening. Winds could gust as high as 24 mph.

Thursday: Mostly sunny, with a high near 54. Calm wind becoming northeast 5 to 9 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 8 mph becoming calm in the evening. Winds could gust as high as 21 mph.

Friday: Mostly sunny, with a high near 55. Light south wind increasing to 6 to 11 mph in the morning. Winds could gust as high as 33 mph.

Friday Night: Mostly cloudy, with a low around 45. South wind around 10 mph, with gusts as high as 31 mph.

Saturday: A 20 percent chance of showers after noon. Partly sunny, with a high near 77. Southwest wind 8 to 10 mph, with gusts as high as 29 mph.

Saturday Night: A 40 percent chance of showers before midnight. Mostly cloudy, with a low around 51. South wind 6 to 10 mph becoming west after midnight. Winds could gust as high as 25 mph.

Sunday: A chance of showers, mainly after noon. Mostly sunny, with a high near 71. West wind 9 to 11 mph, with gusts as high as 31 mph.

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

Monday: Showers likely, mainly after noon. Partly sunny, with a high near 59.

Monday Night: Rain and snow showers likely. Mostly cloudy, with a low around 32.

Tuesday: Rain and snow showers likely. Mostly cloudy, with a high near 45.

Tuesday Night: A slight chance of rain and snow showers. Mostly cloudy, with a low around 30.

Wednesday: A slight chance of showers. Mostly sunny, with a high near 61.

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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