Weather Alert in Alaska
Special Weather Statement issued August 25 at 5:41PM AKDT by NWS Anchorage AK
AREAS AFFECTED: Bristol Bay Borough (Naknek and King Salmon); Lake Iliamna / Nila Vena / Nanvarpak
DESCRIPTION: Strong southeasterly winds up to 45 mph have resulted in the resuspension of ash from the 1912 Katmai-Novarupta eruption across central Lake and Peninsula Borough and could work into eastern Bristol Bay Borough. Communities in central Lake and Peninsula Borough, including Igiugig, may observe reduced visibility as a result of the ash. Resuspended ash may work into eastern Bristol Bay Borough, and the communities of King Salmon and Naknek may see hazy conditions. Those with respiratory ailments in these areas are encouraged to avoid or reduce outdoor activity to avoid inhaling the ash. Rain begins to move into the region Tuesday which should allow ash impacts to cease by Tuesday night.
INSTRUCTION: N/A
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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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