Forecast Details for Westby, MT

Recent Locations: West Liberty, KY Macks Creek, MO Westby, MT

Tonight: Increasing clouds, with a low around 39. Southwest wind 10 to 15 mph, with gusts as high as 21 mph.

Wednesday: Mostly sunny, with a high near 61. West southwest wind 10 to 15 mph increasing to 16 to 21 mph in the afternoon. Winds could gust as high as 28 mph.

Wednesday Night: Showers likely, mainly after midnight. Mostly cloudy, with a low around 31. West wind 8 to 15 mph becoming northeast after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 70%.

Thursday: Rain showers likely before 9am, then snow showers likely. Mostly cloudy, with a high near 40. Breezy, with a northeast wind 23 to 28 mph, with gusts as high as 36 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Thursday Night: A 30 percent chance of snow showers, mainly before midnight. Patchy fog before 7pm. Patchy freezing fog after 7pm. Otherwise, mostly cloudy, with a low around 19. Blustery, with a north northwest wind 16 to 24 mph, with gusts as high as 36 mph. New snow accumulation of less than a half inch possible.

Friday: A 20 percent chance of snow showers before noon. Patchy freezing fog before noon. Partly sunny, with a high near 31. Blustery, with a northwest wind 16 to 23 mph, with gusts as high as 31 mph.

Friday Night: Mostly cloudy, with a low around 17. Blustery, with a north northwest wind 14 to 24 mph, with gusts as high as 31 mph.

Saturday: Mostly sunny, with a high near 41. Northwest wind 14 to 16 mph, with gusts as high as 22 mph.

Saturday Night: Partly cloudy, with a low around 20. Northwest wind 8 to 13 mph becoming south southeast after midnight. Winds could gust as high as 20 mph.

Sunday: Mostly sunny, with a high near 54. South southeast wind 8 to 15 mph, with gusts as high as 21 mph.

Sunday Night: Partly cloudy, with a low around 32. Southeast wind around 14 mph, with gusts as high as 20 mph.

Monday: Mostly sunny, with a high near 65.

Monday Night: Partly cloudy, with a low around 38.

Tuesday: Mostly sunny, with a high near 67.

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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 are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

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