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 Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
Weather Topic: What is Sleet?
Home - Education - Precipitation - Sleet
Next Topic: Snow
Sleet is a form of precipitation in which small ice pellets are the primary
components. These ice pellets are smaller and more translucent than hailstones,
and harder than graupel. Sleet is caused by specific atmospheric conditions and
therefore typically doesn't last for extended periods of time.
The condition which leads to sleet formation requires a warmer body of air to be
wedged in between two sub-freezing bodies of air. When snow falls through a warmer
layer of air it melts, and as it falls through the next sub-freezing body of air
it freezes again, forming ice pellets known as sleet. In some cases, water
droplets don't have time to freeze before reaching the surface and the result is
freezing rain.
Next Topic: Snow
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