Weather Alert in Washington
Special Weather Statement issued July 30 at 10:40AM PDT by NWS Seattle WA
AREAS AFFECTED: San Juan County; Lowlands of Western Whatcom County; Lowlands of Western Skagit and Northwestern Snohomish Counties; Port Townsend Area; Eastern Strait of Juan de Fuca; Western Strait of Juan de Fuca; Northern Washington Coast; Grays Harbor County Coast; Island County
DESCRIPTION: ...TSUNAMI ADVISORY HAS BEEN CANCELED FOR THE WASHINGTON COAST AND STRAIT OF JUAN DE FUCA... The tsunami advisory for the Washington Coast and the Strait of Juan de Fuca coast has been canceled. No tsunami danger presently exists for this area. Local impacts may still be ongoing/possible. Please follow the instructions of local officials who have the authority to determine if it is safe to return to the affected areas. This will be the final statement issued for the local area for this event.
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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