Weather Alert in Oregon
Winter Weather Advisory issued February 15 at 1:38PM PST until February 18 at 3:00PM PST by NWS Pendleton OR
AREAS AFFECTED: Northern Blue Mountains of Oregon; Northwest Blue Mountains
DESCRIPTION: * WHAT...Snow expected. Total snow accumulations between 5 and 11 inches. * WHERE...In Oregon, Northern Blue Mountains above 3000 feet. In Washington, Northwest Blue Mountains above 3000 ft. * WHEN...From 4 AM Monday to 3 PM PST Wednesday. * IMPACTS...Periods of moderate and heavy snow will combine with low visibilities to create difficult driving conditions.
INSTRUCTION: Slow down and use caution while traveling. In Oregon, the latest road conditions can be obtained by visiting tripcheck.com online, or by calling 5 1 1. In Washington, the latest road conditions can be obtained by visiting the website wsdot.wa.gov/travel.
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Current U.S. National Radar--Current
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National Weather Forecast--Current
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North America Water Vapor (Moisture)
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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