Weather Alert in Oregon
Winter Weather Advisory issued February 15 at 9:16PM PST until February 19 at 4:00AM PST by NWS Portland OR
AREAS AFFECTED: North Oregon Coast Range; Central Oregon Coast Range; Clackamas County Cascade Foothills; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills; Willapa Hills; South Washington Cascade Foothills
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations of 2 to 5 inches from Monday morning through Monday night. Another 0.5 to 2 inches of snow is expected from Tuesday morning through Tuesday night, then another 2 to 5 inches of snow is expected from Wednesday morning through Wednesday night. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Mountains of Oregon, Willapa Hills, and South Washington Cascade Foothills. * WHEN...From 4 AM Monday to 4 AM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...The reason that forecast snow amounts are lowest on Tuesday is because precipitation will become light and more isolated. However, precipitation becomes relatively heavier and more widespread again on Wednesday.
INSTRUCTION: Have a winter emergency driving kit readily available. Common items to include: flashlight, batteries, blankets, a shovel, water, non-perishable food items, tire chains, etc. Be aware that walking surfaces may be slick. Walk with extra care. For the latest road conditions and chain restrictions in Oregon, call 5 1 1, or visit: www.tripcheck.com. For the latest road conditions and chain restrictions in Washington, visit: wsdot.com/travel/real-time/map
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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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