Forecast Details for Chicago, IL

Recent Locations: Chicago, IL  
Today: Mostly cloudy, then gradually becoming sunny, with a high near 51. West southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tonight: Partly cloudy, with a low around 35. West northwest wind around 5 mph becoming east in the evening.
Friday: Mostly sunny, with a high near 47. East wind 5 to 10 mph.
Friday Night: Showers, with thunderstorms also possible after 10pm. Low around 43. East northeast wind around 10 mph becoming south after midnight. Chance of precipitation is 80%.
Saturday: A slight chance of thunderstorms before 7am. Partly sunny, with a high near 58. West wind around 10 mph becoming north northwest in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 10%.
Saturday Night: Mostly cloudy, with a low around 39.
Sunday: A 40 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 44.
Sunday Night: Showers. Mostly cloudy, with a low around 43.
Monday: Showers. Mostly cloudy, with a high near 47.
Monday Night: Showers. Mostly cloudy, with a low around 41. Breezy.
Tuesday: A chance of showers. Mostly cloudy, with a high near 45. Breezy.
Tuesday Night: Partly cloudy, with a low around 36.
Wednesday: Mostly sunny, with a high near 49.

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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

The Current National Weather Forecast and National Weather Map are shown below.

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 Contrails?

Home - Education - Cloud Types - Contrails

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

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle