Weather Alert in Washington
Flood Warning issued March 14 at 1:16PM PDT until March 15 at 6:00AM PDT by NWS Portland OR
AREAS AFFECTED: Cowlitz, WA
DESCRIPTION: ...The Flood Warning continues for the following rivers in Washington... Cowlitz River at Kelso affecting Cowlitz County. ...The Flood Warning is cancelled for the following rivers in Washington...Oregon... Cowlitz River at Castle Rock affecting Cowlitz County. Wilson River near Tillamook affecting Tillamook County. * WHAT...Minor flooding is occurring and minor flooding is forecast. * WHERE...Cowlitz River at Kelso. * WHEN...Until tomorrow morning. * IMPACTS...Above 21.5 feet, flooding of several low lying and secondary roads begins, including the Cowlitz Gardens neighborhood, along with flooding of pasture and lowland upstream of Kelso. * ADDITIONAL DETAILS... - At 12:58 PM PDT Saturday the stage was 22.4 feet. - Bankfull stage is 18.0 feet. - Recent Activity...The maximum river stage in the 24 hours ending at 12:58 PM PDT Saturday was 23.5 feet. - Forecast...The river will oscillate above flood stage with a maximum value of 22.3 feet this afternoon. It will fall below flood stage late this evening. - Flood stage is 21.5 feet. - http://www.weather.gov/safety/flood
INSTRUCTION: Be especially cautious at night when it is harder to recognize the dangers of flooding. Motorists should not attempt to drive around barricades or drive through flooded areas. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Additional information is available at www.weather.gov. The next statement will be issued this afternoon at 230 PM 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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