Forecast Details for Rockford, IL

Recent Locations: Killeen, TX Naperville, IL Rockford, IL

Overnight: Partly cloudy, with a low around 12. Wind chill values as low as -3. North northwest wind around 15 mph, with gusts as high as 30 mph.

Monday: Sunny, with a high near 28. Wind chill values as low as -4. North wind 10 to 15 mph, with gusts as high as 30 mph.

Monday Night: Increasing clouds, with a low around 17. Light and variable wind becoming south 5 to 10 mph after midnight. Winds could gust as high as 20 mph.

Tuesday: A slight chance of snow before 3pm, then a slight chance of rain and snow. Mostly cloudy, with a high near 41. Breezy, with a south wind 15 to 20 mph, with gusts as high as 40 mph. Chance of precipitation is 20%.

Tuesday Night: Mostly cloudy, with a low around 20. West northwest wind around 15 mph, with gusts as high as 30 mph.

Wednesday: Mostly sunny, with a high near 34.

Wednesday Night: A 50 percent chance of snow. Mostly cloudy, with a low around 20.

Thursday: A chance of snow before noon. Partly sunny, with a high near 35.

Thursday Night: Partly cloudy, with a low around 19.

Friday: Mostly sunny, with a high near 50.

Friday Night: Partly cloudy, with a low around 28.

Saturday: Partly sunny, with a high near 43.

Saturday Night: Partly cloudy, with a low around 17.

Sunday: Mostly sunny, with a high near 33.

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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)

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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