Forecast Details for Ann Arbor, MI

Recent Locations: West Jordan, UT Victorville, CA Ann Arbor, MI

Today: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 72. West southwest wind 11 to 15 mph, with gusts as high as 26 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Tonight: Rain and thunderstorms before 4am, then a chance of rain after 5am. Some of the storms could produce heavy rainfall. Low around 37. West northwest wind around 10 mph becoming north after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 90%. New precipitation amounts between three quarters and one inch possible.

Wednesday: Rain likely, mainly between 8am and 2pm. Mostly cloudy, with a steady temperature around 41. Northeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 60%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday Night: Rain, mainly after 2am. Low around 35. East northeast wind 8 to 10 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday: Rain. High near 70. South southeast wind around 11 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night: Rain before 8pm, then rain and possibly a thunderstorm between 8pm and 2am, then rain likely after 2am. Low around 58. Chance of precipitation is 90%.

Friday: Rain likely before 8am, then a chance of rain after 2pm. Mostly cloudy, with a high near 71. Chance of precipitation is 60%.

Friday Night: A chance of rain. Mostly cloudy, with a low around 49.

Saturday: Rain and possibly a thunderstorm. Mostly cloudy, with a high near 72.

Saturday Night: Rain, mainly before 2am. Mostly cloudy, with a low around 40.

Sunday: A chance of rain. Mostly cloudy, with a high near 51.

Sunday Night: Mostly cloudy, with a low around 30.

Monday: Partly sunny, with a high near 51.

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North America Water Vapor (Moisture)

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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

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow