Weather Alert in Alaska
Special Weather Statement issued August 23 at 11:17PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Kuskokwim Delta Coast and Nunivak Island
DESCRIPTION: A deepening low pressure system will move northeastward through the Bering Sea to between the Pribilof Islands and Saint Matthew Island through Monday morning and into the vicinity of Norton Sound by Monday afternoon/evening. Strong gusty southerly winds of 40 to 50 mph are likely along the northern Kuskokwim Delta Coast including the communities of Kongiganak, Kwigillingok, and Kipnuk. Peak winds will occur between mid-morning Monday and early Monday evening before slowly diminishing Monday night into Tuesday morning. High surf will accompany the strong winds with wave heights between 4 to 8 feet in the coastal waters along the Kuskokwim Delta Coast. Higher wave heights of 9 to 12 feet are likely at the southern end of Etolin Strait. Peak wave heights occur mid- Monday morning through Monday night before slowly subsiding through Tuesday morning. In addition, periods of heavy rain are also likely Sunday night through Tuesday with 2 to 3 inches of precipitation possible through the duration.
INSTRUCTION: N/A
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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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