Weather Alert in Oregon
Flash Flood Watch issued September 10 at 12:42PM 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 Thursday 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 Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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