Weather Alert in Alaska
Winter Storm Watch issued February 27 at 11:40AM AKST until March 1 at 6:00AM AKST by NWS Juneau AK
AREAS AFFECTED: Glacier Bay; Eastern Chichagof Island; Cape Fairweather to Lisianski Strait; City and Borough of Juneau; Petersburg Borough
DESCRIPTION: ...POTENTIAL OVERRUNNING SNOW EVENT FOR SUNDAY INTO MONDAY... .Snow showers continue to diminish over the southern and central outer coast into Friday afternoon. Main winter story will be this weekend as cold arctic air is expected to move into the panhandle for the end of the week into next week. With the cold air in place, moisture associated with a low over the Gulf into the Bering Sea is expected to move over the area. With the increased dewpoints approaching and colder air at the surface, snow is expected to fall across the Panhandle. Guidance continues to trend toward the most significant snow falling over the parts of the Central Panhandle that hold onto the cold air longer. There is the potential that this overrunning snow event lasts into the middle to end of next week. This will depend on how long the cold air persists through the Inner Channels. * WHAT...Heavy snow possible. Total snow accumulations of 6 to 12 inches possible. * WHERE...Glacier Bay, Eastern Chichagof Island, Cape Fairweather to Lisianski Strait, City and Borough of Juneau and Petersburg Borough. * WHEN...From Saturday morning through late Saturday night. * IMPACTS...Travel could be very difficult and is discouraged. * ADDITIONAL DETAILS...Another round of snowfall is expected to start Saturday, and could potentially last into the start of next week in some areas, with cold Arctic air in place and warm, moisture rich air moving over.
INSTRUCTION: Monitor the latest forecasts for updates on this situation.
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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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