Weather Alert in Oregon
Flood Warning issued March 14 at 6:07AM PDT until March 15 at 2:02AM PDT by NWS Pendleton OR
AREAS AFFECTED: Umatilla, OR
DESCRIPTION: ...The Flood Warning is extended for the following rivers in Oregon... Umatilla River near Gibbon affecting Umatilla County. For the Umatilla River...including Pendleton, Gibbon...Minor flooding is forecast. * WHAT...Minor flooding is forecast. * WHERE...Umatilla River near Gibbon. * WHEN...Until just after midnight tonight. * IMPACTS...At 7.0 feet, flooding of pastures and outbuildings close to the river from around the Bar M Ranch downstream through the Cayuse area. * ADDITIONAL DETAILS... - At 5:15 AM PDT Saturday the stage was 6.7 feet. - Bankfull stage is 6.0 feet. - Forecast...The river is expected to rise above flood stage this morning to a crest of 8.6 feet late this morning. It will then fall below flood stage this evening. - Flood stage is 7.0 feet. - Flood History...This crest compares to a previous crest of 8.8 feet on 01/01/1997. - http://www.weather.gov/safety/flood
INSTRUCTION: Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov/pdt.
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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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