Weather Alert in Iowa
Winter Storm Watch issued March 13 at 5:44AM CDT until March 16 at 1:00PM CDT by NWS La Crosse WI
AREAS AFFECTED: Mitchell; Howard; Winneshiek; Allamakee; Floyd; Chickasaw; Fayette; Clayton; Wabasha; Dodge; Olmsted; Winona; Mower; Fillmore; Houston
DESCRIPTION: ...BLOWING SNOW POSSIBLE THIS MORNING WITH A MAJOR WINTER STORM FOR LATER THIS WEEKEND... .Light snow, combined with increasing winds, could lead to blowing snow and travel impacts across northern into central Wisconsin this morning. These impacts lessen during the afternoon. A second winter storm could approach historic levels as a large band of 12 to 18 inches of snow falls across the region with localized amounts up to 24 inches. The main uncertainty in the forecast is exactly where this band sets up with the highest confidence currently between the Twin Cities and Rochester in southeast Minnesota and along and north of the I-94 corridor in western Wisconsin. There will be a relatively sharp gradient in snow amounts on the southern side of the snow band over northeast Iowa and southwest Wisconsin. In addition to the heavy snow, winds increase Sunday afternoon into Monday morning, with gusts of 35 to 50 mph. These winds could lead to widespread blowing and drifting of snow and blizzard conditions, especially west of the Mississippi River. Regardless of exact snow amounts, expect widespread major travel impacts regionwide with some roads possibly becoming impassable. * WHAT...Blizzard conditions possible. Highest total snow accumulations between 12 and 18 inches with localized amounts approaching 24 inches possible. Lesser amounts of 6 to 12 inches of snow possible outside of this band. Winds could gust as high as 40 to 50 mph. A glaze of ice is also possible if the storm trends further north. * WHERE...Portions of north central and northeast Iowa and southeast Minnesota. * WHEN...From Saturday evening through Monday afternoon. * IMPACTS...Travel could be very difficult to impossible. Widespread blowing snow could significantly reduce visibility. The hazardous conditions could impact the Monday morning commute. Gusty winds could bring down tree branches.
INSTRUCTION: Prepare for possible blizzard conditions. Continue to monitor the latest forecasts for updates on this situation.
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North America Water Vapor (Moisture)
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Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
Weather Topic: What is Condensation?
Home - Education - Precipitation - Condensation
Next Topic: Contrails
Condensation is the process which creates clouds, and therefore
it is a crucial process in the water cycle.
Condensation is the change of matter from a state of gas into a state of liquid,
and it happens because water molecules release heat into the atmosphere and
become organized into a more closely packed structure, what we might see as
water droplets.
Water is always present in the air around us as a vapor, but it's too small for
us to see. When water undergoes the process of condensation it becomes organized
into visible water droplets. You've probably seen condensation happen before on the
surface of a cold drink!
Next Topic: Contrails
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