Weather Alert in Alaska
Winter Weather Advisory issued February 23 at 3:39PM AKST until February 24 at 4:00PM AKST by NWS Anchorage AK
AREAS AFFECTED: Central Copper Valley; Tok Cutoff
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations between 2 and 6 inches from Glennallen to Gakona and 6 to 12 inches along the Tok Cutoff. * WHERE...Central Copper Valley and Tok Cutoff, including Glennallen, Gakona, Chistochina, and Slana. * WHEN...Until 4 PM AKST Tuesday. * IMPACTS...Travel could be very difficult. Visibility reduced to one half mile or less at times. * ADDITIONAL DETAILS...The heaviest snow will be this evening through the overnight hours. The area of highest accumulation is expected along the Tok Cutoff from around Chistochina to Slana. Much less snow is expected as you head south from Glennallen down to Chitina. Snow will gradually taper off during the day Tuesday. However, gusty northwest to northeast winds will develop and lead to reduced visibilities as the freshly fallen snow is lofted and blown around. The gusty winds and blowing snow will likely continue through Tuesday night and perhaps beyond.
INSTRUCTION: Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov.
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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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