Weather Alert in Iowa
Winter Storm Watch issued March 14 at 6:11AM CDT until March 16 at 1:00PM CDT by NWS La Crosse WI
AREAS AFFECTED: Mitchell; Howard; Winneshiek; Allamakee; Crawford; Richland
DESCRIPTION: ...MAJOR WINTER STORM TONIGHT INTO MONDAY MORNING... .A prolonged, high-impact winter storm affects the region tonight through Monday morning. Highest snow totals in excess of 12 to 18 inches are favored north of Interstate 90 with some locales north of Highway 10 approaching 24 inches. Along Interstate 90, a wintry mix of snow, freezing rain, and sleet makes it difficult to pin down exact snow and ice amounts, but impacts do warrant a Winter Storm Warning. Across northeast Iowa and southwest Wisconsin, snow does not look to arrive until Sunday afternoon, so the Winter Storm Watch is maintained for now. Increasing winds Sunday afternoon and night should result in whiteout conditions for exposed locales and an upgrade to a Blizzard Warning is likely once the exact threat area is determined. Regardless of exact snow amounts, expect major travel impacts regionwide with some roads possibly impassable, especially in wind-prone areas. * WHAT...For the Winter Weather Advisory tonight into early Sunday afternoon, mixed precipitation expected. Total snow accumulations up to one inch and ice accumulations around one tenth of an inch. Winds gusting as high as 40 mph. For the Winter Storm Watch Sunday afternoon into Sunday night, heavy mixed precipitation possible. Total snow and sleet accumulations between 4 and 9 inches and ice accumulations around a light glaze possible. Winds could gust as high as 50 mph leading to potential blizzard conditions. * WHERE...Portions of north central and northeast Iowa and southwest Wisconsin. * WHEN...For the Winter Weather Advisory, from 1 AM to 1 PM CDT Sunday. For the Winter Storm Watch, from Sunday afternoon through Monday afternoon. * IMPACTS...Travel could be very difficult. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning commute. Gusty winds could bring down tree branches.
INSTRUCTION: Slow down and use caution while traveling. In Iowa, visit 511ia.org for road conditions. In Wisconsin, visit 511wi.gov for road conditions. Monitor the latest forecasts for updates on this situation.
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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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