Forecast Details for Grinnell, IA

Recent Locations: Grinnell, IA

This Afternoon: Mostly cloudy, with a high near 74. Breezy, with a southeast wind around 20 mph, with gusts as high as 24 mph.

Tonight: Showers and thunderstorms. Some of the storms could produce heavy rainfall. Low around 56. Windy, with a southeast wind 11 to 21 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New rainfall amounts between three quarters and one inch possible.

Tuesday: A 30 percent chance of showers and thunderstorms, mainly before 7am. Cloudy through mid morning, then gradual clearing, with a high near 73. Breezy, with a southwest wind 9 to 17 mph, with gusts as high as 26 mph. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Tuesday Night: Partly cloudy, with a low around 52. South southwest wind 7 to 13 mph, with gusts as high as 22 mph.

Wednesday: A 50 percent chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 73. East southeast wind 8 to 11 mph, with gusts as high as 18 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Wednesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 50. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

Thursday: A chance of showers and thunderstorms. Partly sunny, with a high near 62. Breezy. Chance of precipitation is 50%.

Thursday Night: Mostly clear, with a low around 41. Breezy.

Friday: Sunny, with a high near 68.

Friday Night: A 30 percent chance of showers before 1am. Partly cloudy, with a low around 47.

Saturday: A 30 percent chance of showers. Mostly sunny, with a high near 67. Breezy.

Saturday Night: Mostly clear, with a low around 45.

Sunday: Mostly sunny, with a high near 73.

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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 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