Weather Alert in California
Winter Weather Advisory issued February 7 at 11:36AM PST until February 11 at 4:00PM PST by NWS Sacramento CA
AREAS AFFECTED: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
DESCRIPTION: * WHAT...Total snow accumulations 10 to 18 inches above 6000 feet, locally higher over peaks. Snow accumulations 4 to 10 inches above 5000 feet. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park above 5000 feet. * WHEN...From 10 PM Monday to 4 PM PST Wednesday. * IMPACTS...Mountain travel could be very difficult Tuesday into Wednesday. Plan for delays and chain controls. * ADDITIONAL DETAILS...Heaviest snow expected Tuesday into Tuesday evening.
INSTRUCTION: Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1. Be prepared for slippery roads. Slow down and use caution while driving. The hazardous conditions could make travel difficult with delays and chain controls.
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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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