Weather Alert in Oregon
Fire Weather Watch issued September 4 at 1:41PM PDT until September 5 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: John Day Valley; Central Blue Mountains; Southern Blue Mountains; Western Forested Blue Mountains; Warm Springs Reservation
DESCRIPTION: ...HOT, DRY, AND UNSTABLE CONDITIONS ALONG THE WASHINGTON CASCADES TODAY... ...ISOLATED TO SCATTERED THUNDERSTORMS IN CENTRAL AND EASTERN OREGON FRIDAY... .Hot, dry, and unstable conditions will lead to the potential for rapid fire growth on new and existing fires along the Washington Cascades this afternoon and evening. Farther south, isolated to scattered thunderstorms capable of producing abundant cloud-to- ground lightning are forecast Friday for much of central and eastern Oregon. The National Weather Service in Pendleton has issued a Fire Weather Watch for abundant lightning, which is in effect from Friday afternoon through Friday evening. * AFFECTED AREA...Fire Weather Zones 696 John Day Valley, 697 Central Blue Mountains, 698 Southern Blue Mountains, 699 Western Forested Blue Mountains and 703 Warm Springs Reservation. * TIMING...From Friday afternoon through Friday evening. * IMPACTS...Any fire that develops will catch and spread quickly. Outdoor burning is not recommended. * THUNDERSTORMS...Isolated to scattered thunderstorms capable of producing abundant cloud-to-ground lightning and gusty outflow winds. * OUTFLOW WINDS...Gusts up to 50 mph.
INSTRUCTION: A Fire Weather Watch means that critical fire weather conditions are forecast to occur. Listen for later forecasts and possible Red Flag Warnings.
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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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