Forecast Details for Decorah, IA

Recent Locations: Lucas, IA Rosepine, LA Decorah, IA

Current Alerts for Decorah, IA: Wind Advisory

Overnight: A 30 percent chance of showers. Mostly cloudy, with a low around 37. Southeast wind around 14 mph, with gusts as high as 30 mph.

Wednesday: A chance of showers before 4pm, then showers likely and possibly a thunderstorm between 4pm and 5pm, then a chance of showers and thunderstorms after 5pm. Increasing clouds, with a high near 67. Breezy, with a south wind 17 to 24 mph, with gusts as high as 41 mph. Chance of precipitation is 60%. 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 9pm, then a slight chance of showers between 9pm and 10pm. Cloudy during the early evening, then gradual clearing, with a low around 33. West wind 5 to 9 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

Thursday: A 20 percent chance of showers after 1pm. Increasing clouds, with a high near 55. Northwest wind around 6 mph.

Thursday Night: Showers likely, mainly before 1am. Mostly cloudy, with a low around 36. Calm wind. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday: Sunny, with a high near 56. Calm wind becoming north around 6 mph in the afternoon.

Friday Night: Mostly clear, with a low around 34. Calm wind.

Saturday: A 30 percent chance of showers after 1pm. Partly sunny, with a high near 60. Light east wind becoming southeast 5 to 10 mph in the morning. Winds could gust as high as 18 mph.

Saturday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 51. Southeast wind around 11 mph, with gusts as high as 21 mph. Chance of precipitation is 70%.

Sunday: Showers likely, with thunderstorms also possible after 1pm. Mostly cloudy, with a high near 72. Breezy, with a south wind 11 to 18 mph, with gusts as high as 28 mph. Chance of precipitation is 70%.

Sunday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 61. Breezy, with a south wind around 16 mph, with gusts as high as 28 mph. Chance of precipitation is 60%.

Monday: Showers likely and possibly a thunderstorm. Partly sunny, with a high near 75. Breezy, with a southwest wind 13 to 16 mph, with gusts as high as 24 mph. Chance of precipitation is 60%.

Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 43. Southwest wind around 11 mph becoming northwest after midnight. Winds could gust as high as 21 mph. Chance of precipitation is 60%.

Tuesday: A 40 percent chance of showers. Partly sunny, with a high near 54. North wind 10 to 13 mph.

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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North America Water Vapor (Moisture)

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Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

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