Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 3:24AM CST until February 20 at 6:00AM CST by NWS Des Moines IA
AREAS AFFECTED: Pocahontas; Humboldt; Sac; Calhoun; Webster; Crawford; Carroll
DESCRIPTION: ...ACCUMULATING SNOWFALL WILL IMPACT TRAVEL FROM LATE THURSDAY INTO FRIDAY... .Precipitation will spread from western into central Iowa on Thursday afternoon and evening. Initially, it may begin as rain or a rain/snow mix before changing to snow. Light to moderate snow accumulations are expected by Friday morning, but a narrow band of heavier snowfall is expected with amounts quickly decreasing on either side of the band. Snow rates may near or exceed 1" per hour at times leading to quickly accumulating snow on roads and slick travel conditions. A small change in the location of the band could alter forecast snow amounts. * WHAT...Snow expected. Total snow accumulations between 1 and 4 inches. * WHERE...Portions of north and west central Iowa. * WHEN...From 3 PM this afternoon to 6 AM CST Friday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Thursday evening commute. * ADDITIONAL DETAILS...Snow amounts may vary significantly within any one county.
INSTRUCTION: Slow down and use caution while traveling. For the latest travel conditions, check the Iowa 511 app, www.511ia.org, or dial 511.
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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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