Weather Alert in Oregon
Winter Weather Advisory issued February 18 at 10:00AM PST until February 20 at 4:00AM PST by NWS Portland OR
AREAS AFFECTED: North Oregon Coast Range Lowlands; 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: ...A SERIES OF WEAK SYSTEMS WILL BRING WIDESPREAD SNOW TO THE NORTHERN OREGON AND SOUTHERN WASHINGTON COAST AND CASCADE RANGES THROUGH AT LEAST THURSDAY NIGHT... .A broad area of low pressure will continue to bring widespread snow showers to elevations above 1000 ft through at least Thursday night. Given the showery nature of the precipitation and uncertainty as to the track of tonight's system, there is some variability in forecast total snow fall accumulations through Thursday night. While the forecast remains on track for overall snowfall totals, where exactly the highest snow accumulations occur remain in flux. * WHAT...Snow. Additional snow accumulations of 2 to 7 inches through tonight and another 1 to 3 inches of snow Thursday morning through Thursday night. * WHERE...Foothills of the Northern and Central Oregon Cascades, North and Central Coast Range Mountains of Oregon, North Oregon Coast Range Lowlands, Willapa Hills, and South Washington Cascade Foothills. * WHEN...Until 4 AM PST Friday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous.
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 Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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