Weather Alert in Oregon
Winter Weather Advisory issued March 4 at 9:33AM 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...Snow above 4000 ft. Additional snow accumulations up to 9 to 11 inches at Santiam and Willamette Passes. Winds gusting as high as 35 mph. * WHERE...Cascades of Lane County and Cascades of Marion and Linn Counties. * WHEN...Until 4 AM PST Thursday. * IMPACTS...Roads, and especially bridges and overpasses, will likely become slick and hazardous. Periods of moderate to heavy snowfall combined with low visibilities may create difficult driving conditions. * ADDITIONAL DETAILS...Fairly uniform snow late Wednesday morning will transition to showers in the afternoon. Heaviest snowfall rates are expected between now and 6 PM Wednesday.
INSTRUCTION: Be prepared for slippery roads. Slow down and use caution while driving. If you are going outside, watch your first few steps taken on stairs, sidewalks, and driveways. These surfaces could be slippery, increasing your risk of a fall and injury. 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. 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 Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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