Weather Alert in Iowa
Special Weather Statement issued March 3 at 10:20PM CST by NWS Sioux Falls SD
AREAS AFFECTED: Lyon; Osceola; Dickinson; Sioux; O'Brien; Clay; Lincoln; Lyon; Murray; Cottonwood; Nobles; Jackson; Pipestone; Rock; Kingsbury; Brookings; Sanborn; Miner; Lake; Moody; Aurora; Davison; Hanson; McCook; Minnehaha; Charles Mix; Douglas; Hutchinson; Turner; Lincoln; Bon Homme; Yankton; Clay; Union
DESCRIPTION: Visibilities have begun to fall across portions of southeast South Dakota, southwest Minnesota, and northwest Iowa late this evening as fog begins to develop. Visibilities down to a mile or less have been reported in various locations. If you will be on the road tonight, please remember to use caution as quickly dropping visibilities will result in impacted travel. Make sure to reduce your speed, increase your following distance, and use your low- beam lights if you encounter fog on the road.
INSTRUCTION: N/A
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
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