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 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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