Forecast Details for Spring Valley, IL

Recent Locations: Axson, GA Springtown, TX Spring Valley, IL

Tonight: Showers and possibly a thunderstorm. Low around 41. East wind around 15 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Thursday: Showers and thunderstorms, mainly before 4pm. High near 73. Breezy, with a southeast wind 15 to 20 mph becoming south 20 to 25 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Thursday Night: Showers and thunderstorms likely before 10pm, then showers likely and possibly a thunderstorm between 10pm and 1am. Partly cloudy, with a low around 48. Breezy, with a south wind 20 to 25 mph becoming west 10 to 15 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Friday: A chance of showers between 1pm and 4pm, then a chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 74. West wind 5 to 10 mph becoming southeast in the afternoon. Chance of precipitation is 40%.

Friday Night: Showers before 7pm, then showers and possibly a thunderstorm between 7pm and 4am, then showers after 4am. Low around 50. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: A 50 percent chance of showers before 1pm. Mostly cloudy, with a high near 60.

Saturday Night: Mostly cloudy, with a low around 35. Breezy.

Sunday: Mostly sunny, with a high near 53.

Sunday Night: Mostly clear, with a low around 35.

Monday: Mostly sunny, with a high near 57.

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

Tuesday: Sunny, with a high near 51.

Tuesday Night: Partly cloudy, with a low around 33.

Wednesday: Partly sunny, with a high near 62.

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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