Forecast Details for Posen, IL

Recent Locations: Posen, IL

This Afternoon: A 50 percent chance of showers and thunderstorms, mainly between 3pm and 5pm. Mostly cloudy, with a high near 81. South southwest wind around 15 mph, with gusts as high as 25 mph.

Tonight: Showers and thunderstorms likely, mainly between 11pm and 1am, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 62. South wind 5 to 10 mph becoming west after midnight. Winds could gust as high as 15 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

Friday: Scattered showers, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 65. Northwest wind 5 to 10 mph becoming northeast in the afternoon. Winds could gust as high as 15 mph. Chance of precipitation is 30%.

Friday Night: Mostly clear, with a low around 50. Northeast wind 5 to 10 mph.

Saturday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 76. Northeast wind around 5 mph becoming south southeast in the afternoon. Winds could gust as high as 10 mph.

Saturday Night: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 54.

Sunday: Mostly sunny, with a high near 65.

Sunday Night: Mostly cloudy, with a low around 50.

Monday: A chance of showers. Mostly sunny, with a high near 72.

Monday Night: A chance of showers, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 60.

Tuesday: Showers and thunderstorms. Partly sunny, with a high near 79. Breezy.

Tuesday Night: Showers and thunderstorms likely. Partly cloudy, with a low around 59.

Wednesday: A chance of showers. Mostly sunny, with a high near 79.

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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 Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

Shelf Clouds Next Topic: Sleet

A shelf cloud is similar to a wall cloud, but forms at the front of a storm cloud, instead of at the rear, where wall clouds form.

A shelf cloud is caused by a series of events set into motion by the advancing storm; first, cool air settles along the ground where precipitation has just fallen. As the cool air is brought in, the warmer air is displaced, and rises above it, because it is less dense. When the warmer air reaches the bottom of the storm cloud, it begins to cool again, and the resulting condensation is a visible shelf cloud.

Next Topic: Sleet

Weather Topic: What is Snow?

Home - Education - Precipitation - Snow

Snow Next Topic: Stratocumulus Clouds

Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake, has unique characteristics, but all of them grow in a hexagonal structure. Snowfall can last for sustained periods of time and result in significant buildup of snow on the ground.

On the earth's surface, snow starts out light and powdery, but as it begins to melt it tends to become more granular, producing small bits of ice which have the consistency of sand. After several cycles of melting and freezing, snow can become very dense and ice-like, commonly known as snow pack.

Next Topic: Stratocumulus Clouds