Forecast Details for Naperville, IL

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Current Alerts for Naperville, IL: Special Weather Statement

Tonight: A slight chance of snow between 1am and 2am, then snow and freezing rain likely. Cloudy, with a low around 28. South southwest wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%. Total nighttime ice accumulation of less than a 0.1 of an inch possible. Total nighttime snow accumulation of less than a half inch possible.

Friday: Drizzle, snow, and freezing rain likely before 9am, then a slight chance of snow showers after 3pm. Cloudy, with a high near 38. Breezy, with a north northwest wind 10 to 20 mph, with gusts as high as 35 mph. Chance of precipitation is 70%. Little or no ice accumulation expected. Little or no snow accumulation expected.

Friday Night: Mostly cloudy, then gradually becoming mostly clear, with a low around 10. Wind chill values as low as -2. North wind 10 to 15 mph, with gusts as high as 25 mph.

Saturday: Increasing clouds, with a high near 24. Wind chill values as low as -1. North wind around 5 mph becoming southeast in the afternoon. Winds could gust as high as 15 mph.

Saturday Night: Mostly cloudy, with a low around 18. South southeast wind around 5 mph, with gusts as high as 15 mph.

Sunday: Mostly cloudy, with a high near 33.

Sunday Night: Mostly cloudy, with a low around 21.

Monday: Partly sunny, with a high near 42.

Monday Night: Partly cloudy, with a low around 30.

Tuesday: Mostly sunny, with a high near 51.

Tuesday Night: A chance of rain. Mostly cloudy, with a low around 35.

Wednesday: A chance of rain. Cloudy, with a high near 43.

Wednesday Night: A chance of rain. Cloudy, with a low around 29.

Thursday: A chance of rain and snow. Mostly cloudy, with a high near 39.

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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 Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain