Weather Alert in Oregon
Flash Flood Watch issued July 4 at 8:10AM PDT until July 4 at 8:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Ochoco-John Day Highlands
DESCRIPTION: Thunderstorms will be capable of producing locally heavy rainfall today, especially this afternoon and evening, over last year's burn scars in the Ochoco-John Day Highlands. * WHAT...Flash flooding and debris flows caused by excessive rainfall are possible over the Falls, Crazy Creek, Rail Ridge, and Wiley Flat burn scars. * WHERE...A portion of central Oregon, including the following area, Ochoco-John Day Highlands. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Moderate to heavy rainfall over the Falls, Crazy Creek, Rail Ridge, and Wiley Flat burn scars is expected during the period of the watch. Anyone in or near the Falls, Crazy Creek, Rail Ridge, and Wiley Flat burn scars should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. Heavy rainfall could trigger flash flooding and debris flows in and near recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the burn scars, which may lead to flash flooding and debris flows. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued.
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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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