Forecast Details for Saint Peter, IL

Recent Locations: Moira, NY Amherst Junction, WI Saint Peter, IL

Tonight: A 40 percent chance of showers and thunderstorms, mainly before 2am. Mostly cloudy, with a temperature rising to around 62 by 5am. East wind 8 to 13 mph becoming south after midnight. Winds could gust as high as 22 mph.

Thursday: A chance of showers before 1pm, then a chance of showers and thunderstorms between 1pm and 3pm, then showers likely and possibly a thunderstorm after 3pm. Mostly cloudy, with a high near 76. Breezy, with a south wind 18 to 23 mph increasing to 24 to 29 mph in the afternoon. Winds could gust as high as 37 mph. Chance of precipitation is 70%.

Thursday Night: Showers and thunderstorms likely, mainly before 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 63. Breezy, with a south wind 17 to 22 mph decreasing to 11 to 16 mph after midnight. Winds could gust as high as 32 mph. Chance of precipitation is 70%.

Friday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 78. South wind 10 to 17 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 57. South wind around 14 mph, with gusts as high as 23 mph. Chance of precipitation is 80%.

Saturday: Showers and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. High near 64. Chance of precipitation is 80%.

Saturday Night: A 20 percent chance of showers before 1am. Mostly cloudy, with a low around 39.

Sunday: Sunny, with a high near 55.

Sunday Night: Clear, with a low around 36.

Monday: Sunny, with a high near 62.

Monday Night: Partly cloudy, with a low around 38.

Tuesday: Mostly sunny, with a high near 56.

Tuesday Night: Partly cloudy, with a low around 35.

Wednesday: Mostly sunny, with a high near 64.

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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