Weather Alert in Oregon
Flash Flood Warning issued August 29 at 5:08PM PDT until August 29 at 6:30PM PDT by NWS Pendleton OR
AREAS AFFECTED: Grant, OR; Morrow, OR; Umatilla, OR
DESCRIPTION: FFWPDT The National Weather Service in Pendleton has issued a * Flash Flood Warning for... The Battle Mountain Complex burn scar in... Northern Grant County in central Oregon... Southeastern Morrow County in northeastern Oregon... Southwestern Umatilla County in northeastern Oregon... * Until 630 PM PDT. * At 508 PM PDT, Doppler radar indicated thunderstorms producing heavy rain over the Battle Mountain Complex burn scar. Between 0.5 and 1 inch of rain has fallen. Additional rainfall amounts up to 0.5 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms in and around the Battle Mountain Complex Burn Scar. SOURCE...Radar. IMPACT...Flooding of areas in and around the Battle Mountain Complex Burn Scar. * Some locations that will experience flash flooding include... mainly rural areas of Northern Grant, Southeastern Morrow and Southwestern Umatilla Counties
INSTRUCTION: Move away from recently burned areas. Life-threatening flooding of creeks, roads and normally dry arroyos is likely. The heavy rains will likely trigger rockslides, mudslides and debris flows in steep terrain, especially in and around these areas. Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Flooding is occurring or is imminent. It is important to know where you are relative to streams, rivers, or creeks which can become killers in heavy rains. Campers and hikers should avoid streams or creeks.
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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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