Forecast Details for Port Byron, IL

Recent Locations: Port Byron, IL

Today: Sunny, with a high near 74. North wind 5 to 10 mph becoming east in the afternoon.

Tonight: Clear, with a low around 50. East wind 5 to 10 mph.

Saturday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Increasing clouds, with a high near 76. Southeast wind 5 to 10 mph becoming west in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Mostly cloudy, then gradually becoming mostly clear, with a low around 47. North wind 10 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.

Sunday: Sunny, with a high near 70.

Sunday Night: Partly cloudy, with a low around 51.

Monday: A 30 percent chance of showers after 1pm. Mostly sunny, with a high near 75.

Monday Night: A chance of showers, then showers and possibly a thunderstorm after 1am. Low around 63. Chance of precipitation is 80%.

Tuesday: Showers likely and possibly a thunderstorm. Mostly sunny, with a high near 78. Breezy. Chance of precipitation is 70%.

Tuesday Night: A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 57.

Wednesday: A 40 percent chance of showers. Mostly sunny, with a high near 76.

Wednesday Night: Mostly clear, with a low around 54.

Thursday: Mostly sunny, with a high near 73.

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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 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