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: Wright; Franklin; Butler; Bremer; Hamilton; Hardin; Grundy; Black Hawk; Story; Marshall; Tama; Polk; Jasper; Warren; Marion
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 2 and 5 inches. A narrow corridor of 6 inches is possible within the advisory, but confidence in its placement is low at this time. * WHERE...Portions of central Iowa. * WHEN...From 6 PM this evening 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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North America Water Vapor (Moisture)
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Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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