Forecast Details for Naperville, IL

Recent Locations: Denton, TX Lafayette, LA Naperville, IL

Today: Scattered snow showers between 9am and 3pm. Cloudy, with a high near 32. South southwest wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 50%.

Tonight: Freezing rain and sleet likely before 4am, then snow showers likely, possibly mixed with freezing rain and sleet. Mostly cloudy, with a low around 29. South southwest wind around 10 mph becoming west after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. Little or no snow and sleet accumulation expected.

Friday: Freezing rain and sleet likely, possibly mixed with snow showers before 9am, then a slight chance of snow showers after noon. Mostly cloudy, with a high near 37. Breezy, with a north northwest wind 5 to 10 mph increasing to 15 to 20 mph in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 60%. Little or no ice accumulation expected. New snow and sleet accumulation of less than a half inch possible.

Friday Night: Mostly cloudy during the early evening, then gradual clearing, with a low around 10. Wind chill values as low as -1. North wind 10 to 15 mph, with gusts as high as 30 mph.

Saturday: Mostly sunny, with a high near 25. North wind around 5 mph becoming calm.

Saturday Night: Cloudy, with a low around 18.

Sunday: Mostly cloudy, with a high near 35.

Sunday Night: Partly cloudy, with a low around 23.

Monday: Mostly sunny, with a high near 46.

Monday Night: Mostly cloudy, with a low around 32.

Tuesday: Mostly sunny, with a high near 45.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 32.

Wednesday: A chance of rain. Cloudy, with a high near 39.

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North America Water Vapor (Moisture)

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Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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