Weather Alert in Washington
Flood Warning issued March 14 at 8:16PM PDT until March 15 at 1:22PM PDT by NWS Pendleton OR
AREAS AFFECTED: Walla Walla, WA
DESCRIPTION: ...Forecast flooding changed from Minor to Moderate severity for the following rivers in Washington... Walla Walla River near Touchet affecting Walla Walla County. For the Walla Walla River...including Touchet...Moderate flooding is forecast. * WHAT...Minor flooding is occurring and moderate flooding is forecast. * WHERE...Walla Walla River near Touchet. * WHEN...Until early tomorrow afternoon. * IMPACTS...At 15.0 feet, Moderate flooding of areas along the river. * ADDITIONAL DETAILS... - At 7:30 PM PDT Saturday the stage was 14.6 feet. - Bankfull stage is 10.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 7:30 PM PDT Saturday was 14.6 feet. - Forecast...The river is expected to rise to a crest of 15.3 feet later this evening. It is then expected to fall below flood stage tomorrow afternoon. - Flood stage is 13.0 feet. - Flood History...This crest compares to a previous crest of 15.5 feet on 02/12/1985. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. 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. Additional information is available at www.weather.gov/pdt.
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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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