Weather Alert in Alaska
Winter Weather Advisory issued February 28 at 1:51PM AKST until March 2 at 9:00AM AKST by NWS Juneau AK
AREAS AFFECTED: City and Borough of Sitka
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 to pick up as the low moves into the eastern gulf through Saturday afternoon. Later in the afternoon and evening, south to southwest wind are expected to cause temperatures to warm over the southern outer coast with precipitation becoming a mix or changing to all rain. Around the same time, 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...For the first Winter Weather Advisory, snow. Additional snow accumulations of 2 to 4 inches. Winds gusting as high as 35 mph. For the second Winter Weather Advisory, snow expected. Total snow accumulations of 5 to 7 inches. * WHERE...City and Borough of Sitka. * WHEN...For the first Winter Weather Advisory, until 6 PM AKST this evening. For the second Winter Weather Advisory, from noon Sunday to 9 AM AKST Monday. * IMPACTS...Travel will be difficult. The hazardous conditions could impact the morning or evening commute. * ADDITIONAL DETAILS...Heaviest snowfall rates expected Saturday mid day. Mixing with rain is likely later this afternoon once rates begin decreasing. After a lull overnight Saturday into Sunday, another band of snow is expected to develop and push northward by Sunday afternoon.
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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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