Forecast Details for Chicago O'Hare International Airport, IL

Recent Locations: Hong Kong International Airport, Shanghai Pudong International Airport, 23 Chicago O'Hare International Airport, IL

Current Alerts for Chicago O'Hare International Airport, IL: Special Weather Statement

Tonight: Snow, mainly after 2am. Low around 28. South southwest wind around 10 mph becoming west after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 80%. Total nighttime snow accumulation of around an inch possible.

Friday: Snow likely before 9am, then scattered snow showers after 3pm. Cloudy, with a high near 37. Breezy, with a north northwest wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 35 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible.

Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Wind chill values as low as -2. North wind 10 to 15 mph, with gusts as high as 25 mph.

Saturday: Mostly sunny, with a high near 23. Wind chill values as low as -2. North northwest wind 5 to 10 mph becoming east southeast in the afternoon.

Saturday Night: Mostly cloudy, with a low around 18. South southeast wind around 5 mph, with gusts as high as 15 mph.

Sunday: Mostly cloudy, with a high near 32.

Sunday Night: Mostly cloudy, with a low around 21.

Monday: Partly sunny, with a high near 40.

Monday Night: Partly cloudy, with a low around 30.

Tuesday: Mostly sunny, with a high near 48.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 34.

Wednesday: A chance of rain. Mostly cloudy, with a high near 42.

Wednesday Night: A chance of rain. Cloudy, with a low around 29.

Thursday: A chance of rain and snow. Mostly cloudy, with a high near 38.

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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 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