Weather Alert in Iowa
Winter Storm Watch issued March 13 at 3:28AM CDT until March 16 at 10:00AM CDT by NWS Des Moines IA
AREAS AFFECTED: Emmet; Kossuth; Winnebago; Worth; Palo Alto; Hancock; Cerro Gordo; Pocahontas; Humboldt; Wright; Franklin; Butler; Bremer
DESCRIPTION: ...POTENTIAL WINTER STORM PRODUCING BLIZZARD CONDITIONS SATURDAY NIGHT THROUGH SUNDAY NIGHT... .A potentially significant winter storm will impact parts of the Upper Midwest this weekend, mainly from Saturday night through Sunday night, with lingering impacts due to blowing snow through Monday morning. A swath of heavy snowfall and strong winds may result in blizzard conditions and significant impacts during this time. There is still some uncertainty in how far south into Iowa the heaviest snowfall may occur, but the most likely areas to see the higher snowfall amounts is over northern Iowa, though blizzard conditions with lesser snow as far south as along the I-80 corridor is possible. * WHAT...Heavy snow and blizzard conditions are possible. Total snow accumulations may exceed 6 inches. Winds could gust to 50 mph or higher. * WHERE...Far northern Iowa. * WHEN...From Saturday evening through Monday morning. * 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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Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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