Forecast Details for Boulder, WY

Recent Locations: Darien, IL Gray, ME Boulder, WY

This Afternoon: Scattered showers, with thunderstorms also possible after 3pm. Mostly cloudy, with a high near 51. Southwest wind 11 to 13 mph, with gusts as high as 20 mph. Chance of precipitation is 40%.

Tonight: Rain showers likely before 2am, then rain and snow showers likely between 2am and 3am, then rain showers after 3am. Some thunder is also possible. Low around 31. Southwest wind 5 to 10 mph becoming light and variable in the evening. Chance of precipitation is 80%. Little or no snow accumulation expected.

Wednesday: Rain likely, possibly mixed with snow showers before 10am, then scattered rain showers. Some thunder is also possible. Cloudy, then gradually becoming mostly sunny, with a high near 52. Breezy, with a light northwest wind becoming west northwest 12 to 17 mph in the morning. Winds could gust as high as 24 mph. Chance of precipitation is 70%. Little or no snow accumulation expected.

Wednesday Night: A chance of rain and snow showers after midnight. Mostly cloudy, with a low around 29. West northwest wind 6 to 14 mph becoming south southeast in the evening. Winds could gust as high as 23 mph. Chance of precipitation is 50%. Little or no snow accumulation expected.

Thursday: Rain and snow showers, becoming all snow after 9am. Some thunder is also possible. High near 43. Breezy, with a south wind 8 to 13 mph becoming west 19 to 24 mph in the afternoon. Winds could gust as high as 34 mph. Chance of precipitation is 90%. New snow accumulation of less than a half inch possible.

Thursday Night: Mostly cloudy, with a low around 18. Breezy, with a west wind 17 to 22 mph decreasing to 9 to 14 mph after midnight. Winds could gust as high as 32 mph.

Friday: A 20 percent chance of snow showers after noon. Partly sunny, with a high near 42. Breezy, with a northwest wind 9 to 14 mph increasing to 17 to 22 mph in the afternoon. Winds could gust as high as 32 mph.

Friday Night: Partly cloudy, with a low around 17. Blustery.

Saturday: Sunny, with a high near 52.

Saturday Night: Clear, with a low around 21.

Sunday: Sunny, with a high near 57.

Sunday Night: Partly cloudy, with a low around 24.

Monday: Mostly sunny, with a high near 61.

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North America Water Vapor (Moisture)

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Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet