Weather Alert in California
Flood Advisory issued August 27 at 2:52PM PDT until August 27 at 4:45PM PDT by NWS Reno NV
AREAS AFFECTED: Sierra, CA
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of northeast California, including the Bear burn scar. * WHEN...Until 445 PM PDT. * IMPACTS...Flash flooding and debris flows possible in the area of Bear burn scar. * ADDITIONAL DETAILS... - At 249 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Some locations that will experience flooding include... The Bear burn scar area near Sierra Brooks. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Recent burn areas are more prone to flooding, debris flows, and rock falls. Plugged culverts, rocks and debris on roads, and water and mud over roads are common during moderate to heavy rains. Increased sediment and debris can lead to impacts in areas typically not prone to flooding. Use extra caution when traveling in or below recent burn areas. Impactful flooding and debris flows may be generated by 15 minutes or less of heavy rainfall.
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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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