Forecast Details for Saint Peter, IL

Recent Locations: Vida, OR Gustine, CA Saint Peter, IL

Tonight: A 30 percent chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 62. South wind 11 to 14 mph, with gusts as high as 21 mph.

Friday: Showers and thunderstorms, mainly before noon, then showers likely and possibly a thunderstorm after 1pm. High near 73. Southwest wind 9 to 14 mph, with gusts as high as 21 mph. Chance of precipitation is 90%.

Friday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 52. West wind around 6 mph becoming north after midnight.

Saturday: Sunny, with a high near 75. Northeast wind around 7 mph.

Saturday Night: Partly cloudy, with a low around 52. Northeast wind around 7 mph.

Sunday: A 20 percent chance of showers after 1pm. Partly sunny, with a high near 73.

Sunday Night: A slight chance of showers, then a chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 59. Chance of precipitation is 40%.

Monday: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1pm. High near 78. Breezy. Chance of precipitation is 80%.

Monday Night: Showers likely and possibly a thunderstorm before 1am, then a slight chance of showers. Partly cloudy, with a low around 55. Chance of precipitation is 70%.

Tuesday: Sunny, with a high near 70.

Tuesday Night: A 20 percent chance of showers. Mostly clear, with a low around 49.

Wednesday: Mostly sunny, with a high near 69.

Wednesday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 48.

Thursday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 64.

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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