Weather Alert in Washington
Winter Storm Warning issued March 9 at 1:42PM PDT until March 10 at 5:00AM PDT by NWS Seattle WA
AREAS AFFECTED: Cascades of Whatcom and Skagit Counties; Cascades of Snohomish and Northern King Counties
DESCRIPTION: * WHAT...For the Winter Storm Warning, heavy snow. Additional snow accumulations between 6 and 11 inches. For the Winter Weather Advisory, snow expected. Total snow accumulations between 2 and 4 inches. For the Blizzard Warning, blizzard conditions expected primarily Wednesday afternoon and evening. Winds gusting as high as 40 mph. Total snow accumulations between 2 and 4 feet possible. For the Winter Storm Watch, continued heavy snow is possible. * WHERE...Cascades of Snohomish and Northern King Counties and Cascades of Whatcom and Skagit Counties. * WHEN...For the Winter Storm Warning, until 5 AM PDT Tuesday. For the Winter Weather Advisory, from 5 AM to 5 PM PDT Tuesday. For the Blizzard Warning, from 5 PM Tuesday to 11 PM PDT Wednesday. The strongest winds will peak Wednesday evening into late Wednesday night. For the Winter Storm Watch, from Wednesday evening through Friday morning. * IMPACTS...Visibilities may drop below 1/4 mile due to falling and blowing snow. Travel could be very difficult to impossible. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...The strongest winds will occur over the passes on Wednesday evening into late Wednesday night.
INSTRUCTION: Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. Prepare for possible power outages. Slow down and use caution while traveling. Prepare for possible power outages. Monitor the latest forecasts for updates on this situation. If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages.
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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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