Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 3:15PM CST until February 20 at 9:00AM CST by NWS La Crosse WI
AREAS AFFECTED: Howard; Winneshiek; Floyd; Chickasaw; Houston; La Crosse; Vernon
DESCRIPTION: ...BAND OF MODERATE TO HEAVY SNOW EXPECTED TONIGHT... .A band of snow develops across northeast Iowa into southwest Wisconsin this evening and lasts through the overnight, departing between sunrise and mid-morning. The snow will be heavy at times with rates exceeding 1" per hour, quickly leading to snow-covered and slippery roads. The heaviest snow is forecast to fall in a relatively narrow band with amounts quickly decreasing on either side of the band. Any small changes to the placement of the snow band could change forecast snow amounts at a given location very quickly. Confidence in heavy amounts is highest in far southwest Wisconsin into Juneau and Adams Counties and adjacent areas of northeast Iowa. Areas to the northwest from Charles City to Tomah may see a few inches of accumulation, but amounts will drop off quickly in some cases within a few miles. * WHAT...Snow expected. Total snow accumulations between 2 and 5 inches. Winds gusting as high as 35 mph. * WHERE...In northeast Iowa, Floyd, Chickasaw, Howard, and Winneshiek Counties. In southeast Minnesota, Houston County. In west central Wisconsin, La Crosse and Vernon Counties. * WHEN...From 8 PM this evening to 9 AM CST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Friday morning commute.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, visit 511ia.org for road conditions. In Minnesota, visit 511mn.org for road conditions. In Wisconsin, visit 511wi.gov for road conditions.
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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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