Weather Alert in Washington
Flood Warning issued March 24 at 1:33PM PDT until March 28 at 8:30AM PDT by NWS Spokane WA
AREAS AFFECTED: Chelan, WA
DESCRIPTION: * WHAT...Flooding caused by rain and snowmelt is expected for the lower Stehekin Valley. * WHERE...A portion of North Central Washington, including the following county, Chelan. * WHEN...Until 830 AM PDT Saturday. * IMPACTS...When the Stehekin River gauge hits 19.3 feet, water breaches the river bank. At 20 feet, water inundates some properties and overtops the temporary corduroy bridge. Company Creek Road begins to flood in places at the northern end and Battalion Creek culverts are beginning to be overtopped. At 20.5 feet, water begins to damage Wood Road. * ADDITIONAL DETAILS... - At 122 PM PDT, the Stehekin River was at 21.2 feet and will see an additional rise up to 21.8 feet by Wednesday morning. The river will then recede down to around 20.4 feet at the end of the week. It is forecasted to stay above 20 feet through at least Saturday, March 28th. - Gauge reports of between 0.25 and 1.25 inches of rain have fallen in the headwaters of the Stehekin River over a 24 hour period through 100 PM Tuesday. Snow melt is also occurring and contributing to rises. - http://www.weather.gov/safety/flood
INSTRUCTION: Those living in areas prone to flooding should be prepared to take action should flooding develop.
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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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