Weather Alert in Iowa
Special Weather Statement issued February 16 at 3:22AM CST by NWS Quad Cities IA IL
AREAS AFFECTED: Des Moines; Lee; Henry; Bureau; Putnam; Mercer; Henderson; Warren; Hancock; McDonough; Clark
DESCRIPTION: Patchy dense fog, reducing visibility to around a quarter of a mile or less, will be found across the area mainly from along the Mississippi River between Keokuk to Burlington on eastward to around Monmouth, Kewanee, Sheffield and Princeton. If driving be prepared for some travel impacts for the early morning commute. Visibility could change rapidly over short distances. When encountering fog reduce your speed, use low beam headlights, and also increase your following distance.
INSTRUCTION: N/A
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
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
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