Forecast Details for Waterloo, IL

Recent Locations: Pendleton, SC Hot Springs, MT Waterloo, IL

Overnight: Showers and possibly a thunderstorm. Steady temperature around 68. Southwest wind around 13 mph, with gusts as high as 23 mph. Chance of precipitation is 100%.

Saturday: Showers and possibly a thunderstorm before 1pm, then a slight chance of showers between 1pm and 2pm. Temperature falling to around 54 by 2pm. West wind 11 to 14 mph, with gusts as high as 23 mph. Chance of precipitation is 90%.

Saturday Night: Mostly cloudy, then gradually becoming clear, with a low around 39. Northwest wind 8 to 14 mph, with gusts as high as 22 mph.

Sunday: Sunny, with a high near 57. Northwest wind 7 to 11 mph.

Sunday Night: Clear, with a low around 39. West wind 3 to 6 mph.

Monday: Sunny, with a high near 62.

Monday Night: Mostly cloudy, with a low around 37.

Tuesday: Partly sunny, with a high near 53.

Tuesday Night: Mostly cloudy, with a low around 39.

Wednesday: Mostly sunny, with a high near 71.

Wednesday Night: Partly cloudy, with a low around 52.

Thursday: Mostly sunny, with a high near 75.

Thursday Night: Partly cloudy, with a low around 54.

Friday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 77.

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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 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

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