Weather Alert in Wisconsin
Frost Advisory issued August 28 at 2:28AM CDT until August 29 at 8:00AM CDT by NWS Duluth MN
AREAS AFFECTED: Ashland; Iron
DESCRIPTION: * WHAT...For the Dense Fog Advisory, visibility one quarter to one half mile in dense fog. For the Frost Advisory, temperatures as low as 35 will result in frost formation. * WHERE...Ashland and Iron Counties. This includes the Tribal Lands of the northwestern area of the Lac du Flambeau Band and the Bad River Reservation. Other locations including Madeline Island. * WHEN...For the Dense Fog Advisory, until 9 AM CDT this morning. For the Frost Advisory, from 1 AM to 8 AM CDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. Low visibility could make driving conditions hazardous.
INSTRUCTION: Take steps now to protect tender plants from the cold. If driving, slow down, use your low-beam headlights and fog lights, and leave plenty of distance ahead of you.
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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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