Weather Alert in Alaska
Flood Advisory issued June 19 at 10:48AM AKDT until June 20 at 4:00PM AKDT by NWS Fairbanks AK
AREAS AFFECTED: Central Beaufort Sea Coast; Western Arctic Plains; Central Arctic Plains
DESCRIPTION: * WHAT...Flooding caused by snowmelt and ice jams is expected. * WHERE...Colville near Umiat To The Mouth Of The River. * WHEN...Until 400 PM AKDT Friday. * IMPACTS...High water from rapid snow melt and recent ice jams is leading to significant flooding along the Colville River. * ADDITIONAL DETAILS... - At 1044 AM AKDT, high water extends downstream to the Colville River Delta, leading to flooding of the eastern floodplain. Water levels are expected to continue to level off through the end of the week as additional high elevation snow melt is expected to make its way downstream. - http://www.weather.gov/aprfc
INSTRUCTION: Stay tuned to further developments by listening to your local radio, television, or NOAA Weather Radio for further information.
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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
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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