Weather Alert in Oregon
Winter Weather Advisory issued March 3 at 8:57PM PST until March 5 at 4:00AM PST by NWS Portland OR
AREAS AFFECTED: Cascades of Marion and Linn Counties; Cascades of Lane County
DESCRIPTION: * WHAT...Wet snow expected. Total snow accumulations of 6 to 11 inches. Highest accumulations within Willamette Pass and the Lane County Cascades. * WHERE...Cascades of Lane County and Cascades of Marion and Linn Counties. * WHEN...From 4 AM Wednesday to 4 AM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. * ADDITIONAL DETAILS...Snow will transition to a showery pattern in the afternoon which will lead to less uniform accumulation. There is a 50-60% chance of more than 12 inches of snow during this time frame within Willamette Pass, and a 30% chance within Santiam Pass. Highest snowfall rates may occur between 4 AM to 4 PM 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 Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
Weather Topic: What is Condensation?
Home - Education - Precipitation - Condensation
Next Topic: Contrails
Condensation is the process which creates clouds, and therefore
it is a crucial process in the water cycle.
Condensation is the change of matter from a state of gas into a state of liquid,
and it happens because water molecules release heat into the atmosphere and
become organized into a more closely packed structure, what we might see as
water droplets.
Water is always present in the air around us as a vapor, but it's too small for
us to see. When water undergoes the process of condensation it becomes organized
into visible water droplets. You've probably seen condensation happen before on the
surface of a cold drink!
Next Topic: Contrails
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