Weather Alert in Oregon
Flash Flood Warning issued August 3 at 4:37PM PDT until August 3 at 7:45PM PDT by NWS Boise ID
AREAS AFFECTED: Baker, OR; Malheur, OR
DESCRIPTION: FFWBOI The National Weather Service in Boise has issued a * Flash Flood Warning for... The Cow Valley and Durkee Burn Scar in... South Central Baker County in northeastern Oregon... North Central Malheur County in southeastern Oregon... * Until 745 PM PDT /845 PM MDT/. * At 437 PM PDT /537 PM MDT/, Doppler radar indicated thunderstorms producing heavy rain over the Cow Valley and Durkee Burn Scars. Between 0.5 and 1 inch of rain has fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding in and around the Cow Valley and Durkee Burn Scars. SOURCE...Radar. IMPACT...Life threatening flash flooding of areas in and around the Cow Valley and Durkee Burn Scar. * Some locations that will experience flash flooding include... Brogan, Huntington, California Mountain, Brogan Hill Summit, Rye Valley, Malheur Reservoir, Brosman Mountain, Lime, Malheur City, Weatherby and Sugarloaf Butte.
INSTRUCTION: This is a life threatening situation. Heavy rainfall will cause extensive and severe flash flooding of creeks...streams...and ditches in the Cow Valley and Durkee Burn Scar. Severe debris flows can also be anticipated across roads. Roads and driveways may be washed away in places. If you encounter flood waters...climb to safety. Move away from recently burned areas. Life-threatening flooding of creeks, roads and normally dry washes is likely. The heavy rains will likely trigger rockslides, mudslides and debris flows in steep terrain, especially in and around these areas. 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.
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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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