Forecast Details for Chicago O'Hare International Airport, IL

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Overnight: Cloudy, with a low around 16. Southwest wind around 5 mph, with gusts as high as 10 mph.

Thursday: Scattered snow showers between 9am and 3pm. Cloudy, with a high near 32. South southwest wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

Thursday Night: Freezing rain and sleet likely between 3am and 4am, then snow showers likely, possibly mixed with freezing rain and sleet after 4am. Mostly cloudy, with a low around 29. West wind around 10 mph, with gusts as high as 15 mph. Chance of precipitation is 70%. Little or no ice accumulation expected. Little or no snow and sleet accumulation expected.

Friday: Snow showers, freezing rain, and sleet likely before 9am, then scattered snow showers after noon. Mostly cloudy, with a high near 37. Breezy, with a north northwest wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow and sleet accumulation of less than a half inch possible.

Friday Night: Partly cloudy, with a low around 10. Blustery, with a north wind 10 to 20 mph, with gusts as high as 30 mph.

Saturday: Mostly sunny, with a high near 25.

Saturday Night: A 20 percent chance of snow after midnight. Cloudy, with a low around 18.

Sunday: Mostly cloudy, with a high near 34.

Sunday Night: Partly cloudy, with a low around 23.

Monday: Mostly sunny, with a high near 43.

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

Tuesday: Partly sunny, with a high near 43.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 32.

Wednesday: A chance of rain. Cloudy, with a high near 38.

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Current U.S. National Radar--Current

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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