Weather Alert in Washington
Winter Storm Watch issued March 9 at 5:35AM PDT until March 13 at 11:00AM 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 expected. Additional accumulations of 6 to 12 inches. Total new snow accumulations between 12 and 18 inches. Winds gusting as high as 35 mph. For the Winter Storm Watch, heavy snow possible. Total snow accumulations between 2 and 4 feet possible. Winds could gust as high as 45 mph on Wednesday. * 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 Storm Watch, from late Tuesday night through Friday morning. * IMPACTS...Snow-covered roads may make travel conditions difficult to impossible at times through the mountains and cause delays. Temporary road closures possible. Gusty winds may limit visibility at times and down tree branches. * ADDITIONAL DETAILS...Lower elevations up to and including Snoqualmie Pass may transition over to rain late Wednesday as snow levels briefly rise before lowering again Thursday.
INSTRUCTION: If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Prepare for possible power outages. Monitor the latest forecasts for updates on this situation.
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Weather Topic: What is Graupel?
Home - Education - Precipitation - Graupel
Next Topic: Hail
Graupel is a form of precipitation that is created by atmospheric conditions
which cause supercooled water droplets to contact snow crystals and freeze to
their surface.
Sometimes known as soft hail or snow pellets, graupel is delicate and easily
destroyed by touch. Whereas hail usually falls during severe weather, graupel
doesn't require such conditions to form, and can form in mild precipitation
similar to situations which produce snowfall.
Next Topic: Hail
Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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