Forecast Details for Chicago, IL

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Current Alerts for Chicago, IL: Air Quality Alert
Tonight: Mostly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm in the evening.
Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 92. Heat index values as high as 97. South wind 5 to 10 mph, with gusts as high as 15 mph.
Thursday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, with a low around 74. South southwest wind 5 to 10 mph. Chance of precipitation is 70%. New rainfall amounts between a half and three quarters of an inch possible.
Friday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 87. Southwest wind 5 to 10 mph becoming north northwest in the morning. Winds could gust as high as 15 mph.
Friday Night: Mostly clear, with a low around 72. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Saturday: Sunny, with a high near 85.
Saturday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Partly cloudy, with a low around 72.
Sunday: A chance of showers and thunderstorms. Mostly sunny, with a high near 85.
Sunday Night: Partly cloudy, with a low around 70.
Monday: Mostly sunny, with a high near 79.
Monday Night: Mostly clear, with a low around 69.
Tuesday: Mostly sunny, with a high near 93.
Tuesday Night: A slight chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Wednesday: A slight chance of showers and thunderstorms. Mostly sunny, with a high near 94.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Altostratus Clouds Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds