Weather Alert in California
Flood Watch issued September 1 at 12:24PM PDT until September 3 at 11:00PM PDT by NWS Los Angeles/Oxnard CA
AREAS AFFECTED: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...Northeastern Los Angeles County, including the following areas, Bridge Fire Burn Scar, Antelope Valley, Antelope Valley Foothills, San Gabriel Mountains, and Highway 14 Corridor. * WHEN...From late Tuesday morning through Wednesday evening. * IMPACTS...Flooding from thunderstorms and showers may occur in poor drainage and urban areas. Peak rain rates may reach 0.5 to 1.0 inch per hour. * ADDITIONAL DETAILS... - Increasing moisture and instability combined with slow moving storms will pose an increased risk of flash flooding. Strong outflow winds will be possible with thunderstorms, with locally damaging gusts to 60 mph possible. - http://www.weather.gov/safety/flood
INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.
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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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