Weather Alert in California
Winter Storm Watch issued February 13 at 11:02PM PST until February 18 at 10:00AM PST by NWS Eureka CA
AREAS AFFECTED: Northern Trinity; Southern Trinity
DESCRIPTION: * WHAT...Heavy snow possible. Total snow accumulation between 6 to 10 inches possible above 2000 feet. Total snow accumulations between 1 and 2.5 feet possible for elevations above 3000 feet. * WHERE...Trinity County. * WHEN...From Sunday morning through Wednesday morning. * IMPACTS...Travel could be very difficult to impossible. Tire chains may be necessary if travelling through mountain passes. * ADDITIONAL DETAILS...Snow levels will remain above 4500 feet Sunday through Monday, dropping to 2000 feet Monday night into Tuesday. There is a potential for snow levels as low as 1500 feet with the heaviest snowfall. The heaviest snowfall rates are expected late Monday through Tuesday morning.
INSTRUCTION: Monitor the latest forecasts for updates on this situation.
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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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