Forecast Details for Granite City, IL

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Today: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. Northeast wind 5 to 7 mph.
Tonight: Mostly clear, with a low around 73. Northeast wind around 6 mph becoming calm in the evening.
Monday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Calm wind.
Monday Night: Partly cloudy, with a low around 74. Calm wind.
Tuesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92. Calm wind.
Tuesday Night: Partly cloudy, with a low around 74.
Wednesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Wednesday Night: Mostly clear, with a low around 75.
Thursday: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 94.
Thursday Night: A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Friday: A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Friday Night: A 20 percent chance of showers and thunderstorms. Mostly clear, with a low around 74.
Saturday: A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.

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Current U.S. National Radar--Current

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Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

North America Water Vapor (Moisture)

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North American Water Vapor Map

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow