Forecast Details for Long Valley, SD

Recent Locations: Union, MI Samson, AL Long Valley, SD

Tonight: Rain likely before 1am, then rain and snow likely between 1am and 2am, then rain likely after 2am. Patchy fog after 11pm. Otherwise, cloudy, with a low around 32. East wind 9 to 16 mph, with gusts as high as 25 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

Thursday: A chance of rain and snow before noon, then a slight chance of rain after 3pm. Patchy fog before 10am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 51. North wind 8 to 16 mph becoming southeast in the afternoon. Winds could gust as high as 23 mph. Chance of precipitation is 40%. Little or no snow accumulation expected.

Thursday Night: Rain. Low around 31. East wind 13 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 90%.

Friday: Rain and snow, becoming all snow after 4pm. Steady temperature around 36. Breezy, with a northeast wind 13 to 18 mph becoming north 20 to 25 mph in the afternoon. Winds could gust as high as 33 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

Friday Night: Snow, mainly before midnight. Low around 26. Blustery, with a northwest wind around 26 mph, with gusts as high as 36 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 46. Breezy, with a northwest wind 20 to 29 mph, with gusts as high as 38 mph.

Saturday Night: Mostly clear, with a low around 29. Northwest wind 8 to 16 mph becoming west after midnight. Winds could gust as high as 22 mph.

Sunday: Sunny, with a high near 60. West wind 11 to 14 mph becoming north in the afternoon. Winds could gust as high as 20 mph.

Sunday Night: Mostly cloudy, with a low around 31.

Monday: Partly sunny, with a high near 48. Breezy.

Monday Night: A slight chance of snow. Mostly cloudy, with a low around 27. Breezy.

Tuesday: A slight chance of rain and snow. Mostly sunny, with a high near 60. Windy.

Tuesday Night: Partly cloudy, with a low around 39. Breezy.

Wednesday: A slight chance of rain. Mostly sunny, with a high near 66. Breezy.

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North America Water Vapor (Moisture)

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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

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow