Weather Alert in Iowa
Blizzard Warning issued March 15 at 1:34AM CDT until March 16 at 7:00AM CDT by NWS La Crosse WI
AREAS AFFECTED: Floyd; Chickasaw
DESCRIPTION: ...DANGEROUS WINTER STORM TO IMPACT THE REGION THROUGH MONDAY MORNING... .A dangerous and potentially historic winter storm will impact the region through Monday morning. Snow rates north of Interstate 90 will increase throughout the overnight. By early Sunday morning snowfall rates of 2 to 4 inches per hour are likely across portions of northern Clark and Taylor Counties. Mixed precipitation is likely near I-90 Sunday morning where freezing rain accumulations of one to three tenths of an inch of ice is likely. By Sunday afternoon, much of the area will switchover to snow with wind gusts increasing to 35 to 55 mph. This will result in widespread visibilities reductions to 1/4 mile or less at times where the Blizzard Warning is in effect. Storm total snow accumulations will likely approach all-time records in north-central Wisconsin with 18 to 36 inches of snow expected north of Interstate 94. Travel will be impossible for much of the area throughout the storm. Any travel should be reserved for emergencies only. Power outages and tree damage will be possible with the combination of heavy snow, ice, and increasing winds on Sunday. * WHAT...For the Winter Weather Advisory, mixed precipitation. Additional snow and sleet accumulations up to one inch and ice accumulations around two tenths of an inch. Winds gusting as high as 35 mph. For the Blizzard Warning, blizzard conditions expected. Total snow accumulations between 4 and 6 inches and ice accumulations around one tenth of an inch. Winds gusting as high as 55 mph. * WHERE...In northeast Iowa, Floyd and Chickasaw Counties. * WHEN...For the Winter Weather Advisory, until 10 AM CDT this morning. For the Blizzard Warning, from 10 AM this morning to 7 AM CDT Monday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact the Monday morning commute. Strong winds could cause tree damage.
INSTRUCTION: Slow down and use caution while traveling. Visit 511ia.org for road conditions. Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. Visit 511ia.org for road conditions.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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