Weather Alert in Washington
Flood Watch issued March 18 at 3:23PM PDT until March 22 at 2:11PM PDT by NWS Pendleton OR
AREAS AFFECTED: Yakima Valley
DESCRIPTION: ...The Flood Watch continues for the following rivers in Washington... Naches River near Naches affecting Yakima Valley zone. .Heavy rain along the Cascade crest and warm temperatures leading to increased snow melt will lead to rising water levels on the Naches River. Flows in rivers may increase quickly and reach critical levels. For the Naches River...including Cliffdell, Naches...flooding is possible. * WHAT...Flooding is possible. * WHERE...Naches River near Naches. * WHEN...From Friday afternoon to early Sunday afternoon. * IMPACTS...At 18.6 feet, Minor flooding is possible from Cliffdell downstream to Yakima. * ADDITIONAL DETAILS... - At 1:45 PM PDT Wednesday the stage was 17.4 feet. - Forecast...Flood stage may be reached Friday afternoon. - Flood stage is 17.8 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: If you are in the watch area, remain alert to possible flooding. Additional information is available at www.weather.gov/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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