Forecast Details for Janesville, WI

Recent Locations: Clay, NY Stevinson, CA Janesville, WI

Today: Showers and possibly a thunderstorm before 9am, then showers and thunderstorms likely, mainly after 4pm. High near 72. Southwest wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tonight: Showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 1am, then a chance of showers and thunderstorms after 1am. Patchy fog after 9pm. Low around 56. South wind 5 to 10 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Patchy fog before 9am. Otherwise, cloudy, then gradually becoming mostly sunny, with a high near 69. West wind 5 to 10 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday Night: Partly cloudy, with a low around 51. Northwest wind around 5 mph becoming calm.

Friday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Partly sunny, with a high near 77. South wind 5 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

Friday Night: Showers and possibly a thunderstorm. Low around 44. South wind 10 to 15 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.

Saturday: A chance of showers and thunderstorms. Partly sunny, with a high near 55. West wind 10 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 40%.

Saturday Night: A slight chance of rain showers, mixing with snow after 10pm, then gradually ending. Partly cloudy, with a low around 31. West wind 10 to 15 mph. Chance of precipitation is 20%.

Sunday: Mostly sunny, with a high near 49.

Sunday Night: Partly cloudy, with a low around 30.

Monday: Sunny, with a high near 59.

Monday Night: Partly cloudy, with a low around 45.

Tuesday: Mostly sunny, with a high near 69.

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Weather Topic: What is Hail?

Home - Education - Precipitation - Hail

Hail Next Topic: Hole Punch Clouds

Hail is a form of precipitation which is recognized by large solid balls or clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind. As the hailstones remain in the updraft, ice is deposited onto them until their weight becomes heavy enough for them to fall to the earth's surface.

Hail storms can cause significant damage to crops, aircrafts, and man-made structures, despite the fact that the duration is usually less than ten minutes.

Next Topic: Hole Punch Clouds

Weather Topic: What are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds