Forecast Details for Great Falls, MT

Recent Locations: Wasco, CA Isom, KY Great Falls, MT

Tonight: A 20 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 50. East northeast wind 6 to 10 mph becoming south southwest after midnight.

Wednesday: A chance of rain before 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly sunny, with a high near 72. Breezy, with a south southwest wind 6 to 11 mph increasing to 19 to 24 mph in the morning. Winds could gust as high as 37 mph. Chance of precipitation is 60%.

Wednesday Night: Rain before 3am, then rain, possibly mixed with snow. Low around 30. Breezy, with a west southwest wind around 22 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. Little or no snow accumulation expected.

Thursday: Rain and snow, becoming all snow after 9am. High near 42. Northwest wind around 18 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.

Thursday Night: A 40 percent chance of snow. Mostly cloudy, with a low around 26. Northwest wind 9 to 14 mph, with gusts as high as 23 mph. New snow accumulation of less than a half inch possible.

Friday: A 50 percent chance of snow. Mostly cloudy, with a high near 40. North northwest wind 10 to 15 mph, with gusts as high as 24 mph. New snow accumulation of less than a half inch possible.

Friday Night: A 30 percent chance of snow, mainly before midnight. Mostly cloudy, with a low around 24. North northwest wind 5 to 14 mph becoming west after midnight. Winds could gust as high as 21 mph. Little or no snow accumulation expected.

Saturday: A slight chance of snow. Mostly cloudy, with a high near 42. Light and variable wind becoming northwest 5 to 8 mph in the morning.

Saturday Night: A slight chance of snow before midnight. Mostly cloudy, with a low around 22.

Sunday: A slight chance of snow. Partly sunny, with a high near 44.

Sunday Night: Mostly cloudy, with a low around 26.

Monday: Mostly sunny, with a high near 53.

Monday Night: Partly cloudy, with a low around 31.

Tuesday: Mostly sunny, with a high near 61.

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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 Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle