Forecast Details for Grafton, WI

Recent Locations: Gallman, MS Little Chute, WI Grafton, WI

Current Alerts for Grafton, WI: Winter Weather Advisory

Overnight: Rain or freezing rain, mainly after 1am. Low around 32. Breezy, with an east wind 15 to 20 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. Total nighttime ice accumulation of around a 0.1 of an inch possible.

Thursday: Rain before 10am, then showers and possibly a thunderstorm between 10am and 5pm, then a chance of showers and thunderstorms after 5pm. High near 59. Breezy, with an east wind 15 to 20 mph becoming south in the afternoon. Winds could gust as high as 30 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Thursday Night: Rain and thunderstorms before 11pm, then a slight chance of rain between 11pm and midnight. Low around 38. South wind around 15 mph becoming west after midnight. Winds could gust as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Friday: Partly sunny, with a high near 50. West wind 5 to 10 mph becoming east in the afternoon.

Friday Night: Showers and possibly a thunderstorm. Low around 37. Northeast wind around 10 mph. Chance of precipitation is 100%. New rainfall amounts between a quarter and half of an inch possible.

Saturday: Showers likely, mainly before 7am. Mostly cloudy, with a high near 56. Southeast wind 10 to 15 mph becoming west in the afternoon. Winds could gust as high as 25 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Saturday Night: Mostly cloudy, with a low around 33. West wind around 15 mph.

Sunday: Partly sunny, with a high near 49. Northwest wind around 15 mph, with gusts as high as 25 mph.

Sunday Night: Partly cloudy, with a low around 33.

Monday: A 20 percent chance of showers. Partly sunny, with a high near 49.

Monday Night: A slight chance of rain and snow showers. Mostly cloudy, with a low around 27. Chance of precipitation is 20%.

Tuesday: Mostly sunny, with a high near 41.

Tuesday Night: Mostly clear, with a low around 29.

Wednesday: A slight chance of rain and snow showers. Mostly sunny, with a high near 52. Chance of precipitation is 20%.

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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 Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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