Forecast Details for Merna, IL

Recent Locations: Appleton, WI Spring Branch, TX Merna, IL

Current Alerts for Merna, IL: Wind Advisory

Tonight: Showers and thunderstorms likely before midnight, then a slight chance of showers between midnight and 1am. Some of the storms could be severe. Mostly cloudy, with a low around 52. Breezy, with a west southwest wind 23 to 28 mph decreasing to 10 to 15 mph after midnight. Winds could gust as high as 43 mph. Chance of precipitation is 70%. New precipitation amounts between a quarter and half of an inch possible.

Friday: A slight chance of showers between 2pm and 4pm, then a chance of showers and thunderstorms after 4pm. Mostly cloudy, with a high near 74. West southwest wind 6 to 14 mph becoming south southeast in the morning. Winds could gust as high as 20 mph. Chance of precipitation is 30%.

Friday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 52. South southeast wind 13 to 18 mph, with gusts as high as 29 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

Saturday: Showers likely, mainly before 1pm. Mostly cloudy, with a high near 63. Breezy, with a west wind 16 to 23 mph, with gusts as high as 29 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night: Partly cloudy, with a low around 35. Breezy, with a west wind 15 to 20 mph, with gusts as high as 26 mph.

Sunday: Mostly sunny, with a high near 51. West northwest wind 15 to 18 mph, with gusts as high as 25 mph.

Sunday Night: Mostly clear, with a low around 36. West wind 9 to 11 mph, with gusts as high as 18 mph.

Monday: Mostly sunny, with a high near 54.

Monday Night: Partly cloudy, with a low around 29.

Tuesday: Mostly sunny, with a high near 49.

Tuesday Night: Mostly cloudy, with a low around 34.

Wednesday: Partly sunny, with a high near 64. Breezy.

Wednesday Night: A chance of showers. Mostly cloudy, with a low around 49.

Thursday: A chance of showers. Partly sunny, with a high near 70. Breezy.

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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

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

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.

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds

Weather Topic: What are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds