Weather Alert in Oregon
Winter Weather Advisory issued February 18 at 4:27PM PST until February 19 at 12:00PM PST by NWS Portland OR
AREAS AFFECTED: North Oregon Coast Range Lowlands; North Oregon Coast Range; Central Oregon Coast Range; West Hills and Chehalem Mountains; Clackamas County Cascade Foothills; Cascade Foothills of Marion and Linn Counties; Lane County Cascade Foothills; Willapa Hills; South Washington Cascade Foothills
DESCRIPTION: ...ACCUMULATING SNOW IS EXPECTED TO CONTINUE THROUGH AT LEAST THURSDAY MORNING IN THE COAST RANGE, CASCADES, CASCADE FOOTHILLS, AND ELEVATIONS ABOVE 500 TO 1000 FEET WITHIN THE PORTLAND METRO AND WILLAMETTE VALLEY... * WHAT...Snow. Additional snow accumulations of 1 to 6 inches, with the lowest amounts between 500-1000 feet in elevation and the highest amounts above 1000-1500 feet in elevation. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Mountains of Oregon, North Oregon Coast Range Lowlands, Portland West Hills and Chehalem Mountain, Willapa Hills, and South Washington Cascade Foothills. * WHEN...Until noon PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...A renewed band of snow showers is expected to move over the Coast Range between 6pm PST Wednesday and 12am PST Thursday. Some of these showers may be heavy.
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 Evaporation?
Home - Education - Precipitation - Evaporation
Next Topic: Fog
Evaporation is the process which returns water from the earth
back to the atmosphere, and is another crucial process in the water cycle.
Evaporation is the transformation of liquid into gas, and it happens because
molecules are excited by the application of energy and turn into vapor.
In order for water to evaporate it has to be on the surface of a body of water.
Next Topic: Fog
Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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