Weather Alert in Oregon
Flood Watch issued March 12 at 12:42AM PDT until March 16 at 10:49PM PDT by NWS Portland OR
AREAS AFFECTED: East Central Willamette Valley
DESCRIPTION: ...The Flood Watch continues for the following rivers in Oregon... Wilson River near Tillamook affecting Tillamook County Coast and North Oregon Coast Range Lowlands zones. Trask River near Tillamook affecting Tillamook County Coast and North Oregon Coast Range Lowlands zones. Johnson Creek at Sycamore affecting Inner Portland Metro zone. Pudding River at Aurora affecting East Central Willamette Valley zone. * WHAT...Flooding is possible. * WHERE...Pudding River at Aurora. * WHEN...From Saturday evening to late Monday evening. * IMPACTS...Above 22.0 feet, expect minor flooding of low-lying agricultural lands and access roads along the river. * ADDITIONAL DETAILS... - At 12:00 AM PDT Thursday the stage was 10.1 feet. - Forecast...Flood stage may be reached based on the latest forecast information. - Flood stage is 22.0 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely. If you are in the watch area, remain alert to possible flooding. Additional information is available at www.weather.gov. The next statement will be issued this morning at 900 AM PDT.
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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.
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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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