Weather Alert in Oregon
Flash Flood Watch issued September 11 at 6:29AM PDT until September 11 at 11:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Southern Blue Mountains of Oregon; John Day Basin; Ochoco-John Day Highlands
DESCRIPTION: * WHAT...Flash flooding and debris flows caused by excessive rainfall is possible over recent burn scars. * WHERE...Portions of central and northeast Oregon, including the following areas, in central Oregon, John Day Basin and Ochoco-John Day Highlands. In northeast Oregon, Southern Blue Mountains of Oregon. * WHEN...Through this evening. * IMPACTS...Heavy rainfall of 1 to 1.5 inches could trigger flash flooding of low-lying areas, and debris flows in and near numerous recent wildfire burn scars. * ADDITIONAL DETAILS... - National Weather Service Meteorologists are forecasting heavy rainfall over the burn scar, 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 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
Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds
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