Forecast Details for Markham, IL

Recent Locations: Netawaka, KS Gamaliel, KY Markham, IL

Today: A slight chance of showers before 3pm, then a chance of showers and thunderstorms between 3pm and 5pm, then showers likely and possibly a thunderstorm after 5pm. Mostly cloudy, with a high near 55. East wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers and possibly a thunderstorm before 3am, then a chance of showers. Low around 35. Breezy, with an east northeast wind 10 to 15 mph becoming west southwest 15 to 20 mph after midnight. Winds could gust as high as 35 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: A chance of rain and snow before 9am, then a chance of snow between 9am and noon. Mostly cloudy, with a steady temperature around 38. Breezy, with a west wind 20 to 25 mph decreasing to 15 to 20 mph in the afternoon. Winds could gust as high as 40 mph. Chance of precipitation is 30%.

Friday Night: Partly cloudy, with a low around 28. West wind 5 to 15 mph, with gusts as high as 20 mph.

Saturday: Partly sunny, with a high near 39. West northwest wind 5 to 10 mph, with gusts as high as 15 mph.

Saturday Night: A 20 percent chance of snow after midnight. Mostly cloudy, with a low around 26.

Sunday: A 20 percent chance of snow. Mostly cloudy, with a high near 34.

Sunday Night: Mostly cloudy, with a low around 22.

Monday: Partly sunny, with a high near 32.

Monday Night: Partly cloudy, with a low around 21.

Tuesday: Mostly sunny, with a high near 40.

Tuesday Night: Mostly cloudy, with a low around 33.

Wednesday: Partly sunny, with a high near 50.

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Current U.S. National Radar--Current

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North America Water Vapor (Moisture)

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Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation

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