Weather Alert in Oregon
Special Weather Statement issued April 1 at 4:40PM PDT by NWS Pendleton OR
AREAS AFFECTED: Lower Columbia Basin of Oregon; Foothills of the Northern Blue Mountains of Oregon; Foothills of the Southern Blue Mountains of Oregon; Lower Columbia Basin of Washington
DESCRIPTION: At 440 PM PDT, Doppler radar was tracking strong thunderstorms along a line extending from 10 miles south of Irrigon to 18 miles south of Echo. Movement was northeast at 40 mph. HAZARD...Wind gusts of 50 to 55 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possible. Locations impacted include... Hermiston, Pendleton, Umatilla, Stanfield, Echo, Holdman, Rieth, Plymouth, Cayuse, Mission, and northwestern Umatilla Reservation. This includes the following highways... Highway 11 between mile markers 1 and 8. Highway 395 between mile markers 1 and 24, between mile markers 12 and 14, and between mile markers 1 and 12. Interstate 82 between mile markers 115 and 131. Interstate 84 between mile markers 174 and 223.
INSTRUCTION: If outdoors, consider seeking shelter inside a building. These storms may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. To report severe weather, contact your nearest law enforcement agency. They will relay your report to the National Weather Service office in Pendleton Oregon.
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Weather Topic: What are Hole Punch Clouds?
Home - Education - Cloud Types - Hole Punch Clouds
Next Topic: Mammatus Clouds
A hole punch cloud is an unusual occurrence when a disk-shaped
hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.
When part of the cloud forms ice crystals, water droplets in the surrounding area
of the cloud evaporate. The effect of this process produces a large elliptical
gap in the cloud. The hole punch cloud formation is rare, but it is not specific
to any geographic area.
Other names which have been used to describe this phenomena include fallstreak hole,
skypunch, and cloud hole.
Next Topic: Mammatus Clouds
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
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