Weather Alert in Alaska
Winter Weather Advisory issued February 28 at 10:51PM AKST until March 2 at 6:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Prince of Wales Island; City and Borough of Wrangell
DESCRIPTION: ...CENTRAL AND SOUTHERN PANHANDLE SNOW SATURDAY WITH POTENTIAL FOR MORE SNOW SUNDAY... Steady snowfall continues across a majority of the panhandle and will continue as the low moves into the eastern gulf through Saturday night before beginning to diminish. South to southwest winds are causing temperatures to warm over the southern outer coast with precipitation becoming a mix or changing to all rain. Through Saturday night, snow will end on the NW side of the low, from Sitka to Juneau and northward. Moisture will decrease overnight Saturday across the south, but then redevelop on Sunday as another system moves in. The rain/snow line will likely hover in vicinity of Sumner Strait Sunday into Monday with additional heavy snow expected for the Petersburg and Wrangell areas and lighter snow northward. A separate low pressure system looks to affect the region on Tuesday with potential for snow to push northward once again. * WHAT...Snow expected. Total snow accumulations of up to 9 inches. * WHERE...Prince of Wales Island and City and Borough of Wrangell. * WHEN...From 6 AM Sunday to 6 AM AKST Monday. * IMPACTS...Travel could be very difficult and is discouraged. * ADDITIONAL DETAILS...Another surge of moisture will bring higher snowfall rates by late Sunday morning. A warm push is expected to lower snowfall ratios and cause a transition to mixed precipitation by Monday morning.
INSTRUCTION: Slow down and use caution while traveling. People are urged to prepare their property before the onset of winter weather. For the latest road conditions, where available, call 5 1 1 or visit 511.alaska.gov.
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Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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