Weather Alert in Alaska
High Wind Warning issued February 19 at 10:22AM AKST until February 20 at 7:00PM AKST by NWS Anchorage AK
AREAS AFFECTED: Thompson Pass
DESCRIPTION: * WHAT...North winds 45 to 60 mph with gusts up to 75 mph. Wind chill readings dropping as low as 30 below zero Friday afternoon. * WHERE...Thompson Pass. * WHEN...From 11 PM this evening to 7 PM AKST Friday. * IMPACTS...Travel could be difficult. The dangerously cold wind chills as low as 30 below zero could cause frostbite on exposed skin in as little as 10 minutes. Blowing snow due to high winds may reduce visibility to as low as one half mile at times tonight through Friday morning. * ADDITIONAL DETAILS...Winds will strengthen through the day today, then peak tonight through Friday. Winds will be slow to diminish Friday night through Saturday.
INSTRUCTION: People are urged to secure loose objects that could be blown around or damaged by the wind. Prepare for the possibility of widespread power outages. Use caution if you must drive.
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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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