Weather Alert in Iowa
Winter Weather Advisory issued February 19 at 2:49AM CST until February 20 at 6:00AM CST by NWS Quad Cities IA IL
AREAS AFFECTED: Buchanan; Delaware; Dubuque; Benton; Linn; Jones
DESCRIPTION: * WHAT...Snow, blowing snow and some drifting is expected. Total snow accumulations between 3 and 5 inches. Localized totals up to 6 inches are possible. Winds gusting as high as 35 mph. * WHERE...Portions of east central and northeast Iowa. * WHEN...From 6 PM this evening to 6 AM CST Friday. * IMPACTS...Plan on slippery road conditions, blowing snow and minor drifting of snow. * ADDITIONAL DETAILS...There remains the potential for higher snowfall totals in this advisory. Uncertainty in where the snow band may set up remains and a last minute upgrade to a Winter Storm Warning cannot be ruled out. Snow will initially melt on area roadways before accumulating. The highest snowfall totals will be on grassy surfaces.
INSTRUCTION: Slow down and use caution while traveling. the latest road conditions are available at 511ia.org or by calling 511.
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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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