Weather Alert in Oregon
Flood Watch issued March 12 at 12:42AM PDT until March 14 at 5:39AM PDT by NWS Portland OR
AREAS AFFECTED: Inner Portland Metro
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...Johnson Creek at Sycamore. * WHEN...From this morning to early Saturday morning. * IMPACTS...Above 11.0 feet, minor flooding begins along Johnson Creek between SE 92nd Street to SE 122nd Street and between Johnson Creek and SE Harold Street. * ADDITIONAL DETAILS... - At 12:30 AM PDT Thursday the stage was 4.6 feet. - Forecast...Flood stage may be reached this morning. - Flood stage is 11.0 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 is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
Weather Topic: What are Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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