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 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
Weather Topic: What are Stratocumulus Clouds?
Home - Education - Cloud Types - Stratocumulus Clouds
Next Topic: Stratus Clouds
Stratocumulus clouds are similar to altocumulus clouds in their
fluffy appearance, but have a slightly darker shade due to their additional mass.
A good way to distinguish the two cloud types is to hold your hand out and measure
the size of an individual cloud; if it is the size of your thumb it is generally
an altocumulus cloud, if it is the size of your hand it is generally a
stratocumulus cloud.
It is uncommon for stratocumulus clouds to produce precipitation, but if they do
it is usually a light rain or snow.
Next Topic: Stratus Clouds
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