Weather Alert in Oregon
Flood Warning issued March 14 at 2:33AM PDT by NWS Portland OR
AREAS AFFECTED: Tillamook, OR
DESCRIPTION: ...The Flood Warning is extended for the following rivers in Oregon...Washington... Nehalem River near Foss affecting Clatsop and Tillamook Counties. Wilson River near Tillamook affecting Tillamook County. Cowlitz River at Kelso affecting Cowlitz County. Grays River at Covered Bridge near Rosburg affecting Wahkiakum County. Johnson Creek at Sycamore affecting Clackamas and Multnomah Counties. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Wilson River near Tillamook. * WHEN...Until further notice. * IMPACTS...Above 12.0 feet, minor flooding of low lying dairy and pasture land north and east of Tillamook can be expected, particularly during high tides. * ADDITIONAL DETAILS... - At 1:30 AM PDT Saturday the stage was 12.7 feet. - Bankfull stage is 10.5 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 1:30 AM PDT Saturday was 12.7 feet. - Forecast...The river has reached minor flood stage of 12.2 ft. It will then fall below flood stage Saturday morning. - Flood stage is 12.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Motorists should not attempt to drive around barricades or drive through flooded areas. Be especially cautious at night when it is harder to recognize the dangers of flooding. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued early Saturday morning at 600 AM PDT.this morning at 600 AM 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.
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