Forecast Details for McHenry, IL

Recent Locations: McHenry, IL  
This Afternoon: Sunny, with a high near 57. East wind 5 to 10 mph.
Tonight: Mostly clear, with a low around 38. East wind 5 to 10 mph, with gusts as high as 15 mph.
Friday: Showers after 1pm. High near 59. East southeast wind 10 to 15 mph, with gusts as high as 30 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.
Friday Night: Showers and possibly a thunderstorm. Low around 54. Breezy, with a south wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 90%.
Saturday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 78. Breezy, with a south southwest wind 20 to 25 mph, with gusts as high as 40 mph.
Saturday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 1am. Low around 63. Breezy. Chance of precipitation is 80%.
Sunday: Showers and possibly a thunderstorm. High near 75. Breezy. Chance of precipitation is 80%.
Sunday Night: Showers and possibly a thunderstorm. Mostly cloudy, with a low around 59. Breezy.
Monday: A chance of showers. Mostly cloudy, with a high near 69. Breezy.
Monday Night: Partly cloudy, with a low around 49.
Tuesday: Mostly sunny, with a high near 70.
Tuesday Night: A chance of showers. Partly cloudy, with a low around 55.
Wednesday: Mostly sunny, with a high near 75.

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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

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

Tomorrows National Weather Map

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

North American Water Vapor Map

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Condensation Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails

Weather Topic: What are Cumulonimbus Clouds?

Home - Education - Cloud Types - Cumulonimbus Clouds

Cumulonimbus Clouds Next Topic: Cumulus Clouds

The final form taken by a growing cumulus cloud is the cumulonimbus cloud, which is very tall and dense. The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although most commonly they stop growing at an altitude of 6 km.

Even small cumulonimbus clouds appear very large in comparison to other cloud types. They can signal the approach of stormy weather, such as thunderstorms or blizzards.

Next Topic: Cumulus Clouds