Forecast Details for Ann Arbor, MI

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Today: Snow likely, mainly after 4pm. Mostly cloudy, with a high near 23. Light southwest wind becoming south southwest 5 to 9 mph in the morning. Chance of precipitation is 60%. Total daytime snow accumulation of less than a half inch possible.

Tonight: Snow, mainly after 4am. Low around 19. Southwest wind around 7 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

Friday: Snow before 10am, then scattered snow showers after 10am. High near 33. Southwest wind 6 to 14 mph becoming northwest in the afternoon. Winds could gust as high as 28 mph. Chance of precipitation is 80%. New snow accumulation of less than one inch possible.

Friday Night: Partly cloudy, with a low around 0. Wind chill values as low as -13. North northwest wind 11 to 17 mph, with gusts as high as 34 mph.

Saturday: Sunny, with a high near 15. North northwest wind 7 to 10 mph, with gusts as high as 20 mph.

Saturday Night: A chance of snow after 1am. Increasing clouds, with a low around 2. Chance of precipitation is 30%.

Sunday: Mostly cloudy, with a high near 21.

Sunday Night: Mostly cloudy, with a low around 9.

Monday: Mostly cloudy, with a high near 31.

Monday Night: Mostly cloudy, with a low around 20.

Tuesday: Partly sunny, with a high near 35.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 20.

Wednesday: A chance of rain and snow. Cloudy, with a high near 31.

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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 Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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