Forecast Details for Onalaska, WI

Recent Locations: Randolph Center, VT Chilmark, MA Onalaska, WI

Current Alerts for Onalaska, WI: Winter Weather Advisory

Overnight: Showers. Low around 33. East wind around 9 mph, with gusts as high as 22 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday: Showers, mainly before 3pm. High near 45. East wind 8 to 13 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Thursday Night: Showers likely, mainly before 8pm. Mostly cloudy, with a low around 33. West wind 6 to 8 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday: Showers likely and possibly a thunderstorm, mainly after 4pm. Partly sunny, with a high near 50. Light and variable wind becoming east 5 to 7 mph in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday Night: Showers and possibly a thunderstorm before 1am, then showers likely. Low around 38. East wind 8 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: A 20 percent chance of showers. Mostly cloudy, with a high near 46. West wind 8 to 15 mph, with gusts as high as 26 mph.

Saturday Night: Mostly cloudy, with a low around 31. West wind 11 to 14 mph, with gusts as high as 25 mph.

Sunday: Mostly sunny, with a high near 52. Northwest wind around 10 mph, with gusts as high as 20 mph.

Sunday Night: Partly cloudy, with a low around 35. West wind around 7 mph.

Monday: Partly sunny, with a high near 48. Northwest wind 7 to 11 mph, with gusts as high as 20 mph.

Monday Night: Partly cloudy, with a low around 27. Northwest wind 5 to 9 mph, with gusts as high as 18 mph.

Tuesday: Mostly sunny, with a high near 48. Northeast wind 5 to 9 mph becoming southeast in the afternoon.

Tuesday Night: A chance of rain and snow showers. Mostly cloudy, with a low around 35. Southeast wind 7 to 11 mph, with gusts as high as 21 mph. Chance of precipitation is 30%.

Wednesday: A 30 percent chance of showers. Partly sunny, with a high near 61. Breezy, with a south wind 10 to 16 mph, with gusts as high as 26 mph.

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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 are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle