Forecast Details for Markham, IL

Recent Locations: Markham, IL  
This Afternoon: Mostly sunny, with a high near 51. West wind 10 to 15 mph, with gusts as high as 20 mph.
Tonight: Partly cloudy, with a low around 34. Northwest wind around 5 mph becoming calm in the evening.
Friday: Mostly sunny, with a high near 58. Light northeast wind becoming east 5 to 10 mph in the morning.
Friday Night: A chance of showers before 10pm, then showers and possibly a thunderstorm between 10pm and 4am, then a chance of showers and thunderstorms after 4am. Low around 48. East northeast wind 10 to 15 mph becoming south southwest after midnight. Winds could gust as high as 20 mph. Chance of precipitation is 90%.
Saturday: A chance of showers and thunderstorms before 7am, then a slight chance of showers between 7am and 10am. Mostly cloudy, with a high near 62. Southwest wind 10 to 15 mph becoming northwest in the afternoon. Chance of precipitation is 30%.
Saturday Night: Mostly cloudy, with a low around 39.
Sunday: A 50 percent chance of showers, mainly after 1pm. Mostly cloudy, with a high near 52.
Sunday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 43.
Monday: Showers likely, then showers and possibly a thunderstorm after 1pm. Mostly cloudy, with a high near 54.
Monday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Mostly cloudy, with a low around 41.
Tuesday: A chance of showers. Mostly cloudy, with a high near 50.
Tuesday Night: A chance of showers. Mostly cloudy, with a low around 34.
Wednesday: Mostly sunny, with a high near 49.

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

National Weather Forecast--Current

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Today's National Weather Map

National Weather Forecast for Tomorrow

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Tomorrows National Weather Map

North America Water Vapor (Moisture)

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North American Water Vapor Map

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

Weather Topic: What are Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Stratocumulus Clouds Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds