Forecast Details for Helena, MT

Recent Locations: Glencoe, IL Lisman, AL Helena, MT

Tonight: A chance of snow before 2am, then a chance of snow after 3am. Mostly cloudy, with a low around 27. West wind 7 to 16 mph, with gusts as high as 31 mph. Chance of precipitation is 50%. Total nighttime snow accumulation of less than a half inch possible.

Thursday: Snow showers likely, mainly after 2pm. Partly sunny, with a high near 41. West northwest wind 6 to 15 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.

Thursday Night: A chance of snow showers before midnight, then a slight chance of snow after midnight. Mostly cloudy, with a low around 26. West wind 6 to 14 mph, with gusts as high as 28 mph. Chance of precipitation is 40%. New snow accumulation of less than a half inch possible.

Friday: Snow likely, mainly between noon and 3pm, then snow showers likely after 3pm. Some thunder is also possible. Mostly cloudy, with a high near 44. West wind 6 to 11 mph, with gusts as high as 24 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Friday Night: Partly cloudy, with a low around 26. Northwest wind 6 to 11 mph becoming southwest after midnight. Winds could gust as high as 22 mph.

Saturday: Sunny, with a high near 56. Southwest wind 5 to 9 mph, with gusts as high as 20 mph.

Saturday Night: Partly cloudy, with a low around 32. South southwest wind 5 to 9 mph, with gusts as high as 20 mph.

Sunday: Sunny, with a high near 66. Light south wind becoming southwest 5 to 9 mph in the afternoon. Winds could gust as high as 20 mph.

Sunday Night: Partly cloudy, with a low around 39.

Monday: Mostly sunny, with a high near 72.

Monday Night: Partly cloudy, with a low around 43.

Tuesday: Mostly sunny, with a high near 73.

Tuesday Night: A slight chance of rain. Mostly cloudy, with a low around 44.

Wednesday: A chance of rain. Partly 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)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

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