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 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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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