Weather Alert in California
Flood Advisory issued September 2 at 4:22AM PDT until September 2 at 7:30AM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: San Luis Obispo, CA
DESCRIPTION: * WHAT...Minor mud and debris flows caused by excessive rainfall are possible. * WHERE...The Madre Burn Area in San Luis Obispo County. * WHEN...Until 730 AM PDT. * IMPACTS...Minor mud and debris flow may occur from the Madre burn scar. Rises in small streams and normally dry arroyos. * ADDITIONAL DETAILS... - At 418 AM PDT, Doppler radar indicated heavy rain due to showers and thunderstorms moving over the Madre burn scar. Minor flooding and mud and debris flows are possible in the advisory area early this morning. - Some locations that will experience flooding include... Carrizo Plain. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Be aware of your surroundings and do not drive on flooded roads. 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 are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds
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
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