Forecast Details for Great Lakes, IL

Recent Locations: Institute, WV Marion, IL Great Lakes, IL

This Afternoon: A 20 percent chance of showers after 4pm. Cloudy, with a high near 39. Breezy, with a southwest wind 15 to 20 mph, with gusts as high as 35 mph.

Tonight: A 20 percent chance of showers before 7pm. Cloudy during the early evening, then gradual clearing, with a low around 22. West northwest wind 10 to 15 mph.

Wednesday: Sunny, with a high near 32. West northwest wind 10 to 15 mph, with gusts as high as 25 mph.

Wednesday Night: Partly cloudy, with a low around 19. Northwest wind around 5 mph.

Thursday: Mostly sunny, with a high near 38. West wind 5 to 10 mph becoming south in the morning.

Thursday Night: Mostly clear, with a low around 29.

Friday: Sunny, with a high near 56.

Friday Night: Partly cloudy, with a low around 31.

Saturday: A chance of snow after noon. Mostly cloudy, with a high near 36.

Saturday Night: Mostly cloudy, with a low around 22.

Sunday: Partly sunny, with a high near 30.

Sunday Night: A chance of snow. Mostly cloudy, with a low around 22.

Monday: Partly sunny, with a high near 33.

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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

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 Contrails?

Home - Education - Cloud Types - 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

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