Weather Alert in Oregon
Flood Advisory issued March 13 at 2:45PM PDT until March 14 at 3:00PM PDT by NWS Pendleton OR
AREAS AFFECTED: Umatilla, OR; Union, OR; Wallowa, OR; Columbia, WA; Walla Walla, WA
DESCRIPTION: * WHAT...Flooding caused by rain and snowmelt is expected. * WHERE...Portions of northeast Oregon, including the following counties, Umatilla, Union and Wallowa and southeast Washington, including the following counties, Columbia and Walla Walla. * WHEN...Until 300 PM PDT Saturday. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Rises in small streams and normally dry arroyos. Overflowing poor drainage areas. River or stream flows are elevated. * ADDITIONAL DETAILS... - At 238 PM PDT, rain and snowmelt is occurring, and will cause minor flooding. - At 2:40 PM, rain is falling over the Blue Mountains and the Blue Mountain Foothills and is expected to increase tonight. Additional rainfall amounts of 1 to 3 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Walla Walla, Pendleton, La Grande, Dayton, Meacham, College Place, Milton-Freewater, Waitsburg, Athena, Weston, Adams, Prescott, Helix, Starbuck, Bingham Springs, Tollgate, Spout Springs, Garrett, Gibbon and Dixie. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be aware of your surroundings and do not drive on flooded roads. In hilly terrain there are hundreds of low water crossings which are potentially dangerous in heavy rain. Do not attempt to cross flooded roads. Find an alternate route.
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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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