Weather Alert in Washington
Winter Storm Warning issued March 9 at 1:58PM PDT until March 13 at 5:00AM PDT by NWS Pendleton OR
AREAS AFFECTED: Upper Slopes of the Eastern Washington Cascades Crest
DESCRIPTION: * WHAT...Winter Weather Advisory, snow. Additional snow accumulations between 2 and 6 inches. Winds gusting as high as 30 mph rest of today. Winter Storm Warning, heavy snow expected. Total snow accumulations between 1 and 3 feet. Winds gusting as high as 35 mph 11 pm Wednesday to 5 pm Thursday. * WHERE...Upper Slopes of the Eastern Washington Cascades Crest. * WHEN...For the Winter Weather Advisory, until 8 AM PDT Tuesday. For the Winter Storm Warning, from 5 PM Tuesday to 5 AM PDT Friday. * IMPACTS...Heavy snowfall and very low visibility will create extremely dangerous driving conditions. Gusty winds could bring down tree branches. * ADDITIONAL DETAILS...A strong winter storm will bring heavy mountain snow Tuesday night through Friday morning. There is a lull expected which will occur late Wednesday morning through early Thursday morning as snow levels rise bringing a wintery mix or rain before decreasing Thursday returning heavy snow to pass-level.
INSTRUCTION: Persons should consider delaying all travel. If travel is absolutely necessary, drive with extreme caution. Consider taking a winter storm kit along with you, including such items as tire chains, booster cables, flashlight, shovel, blankets and extra clothing. Also take water, a first aid kit, and anything else that would help you survive in case you become stranded. Do not touch downed lines and report any power outages to your electric company. Travel is highly discouraged due to slick roadways and the possibility of downed trees and power lines. Slow down and use caution while traveling. The latest road conditions can be obtained by visiting the website wsdot.wa.gov/travel.
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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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