Weather Alert in California
Cold Weather Advisory issued February 20 at 12:00PM PST until February 21 at 9:00AM PST by NWS San Francisco CA
AREAS AFFECTED: North Bay Interior Mountains; North Bay Interior Valleys; East Bay Interior Valleys; Santa Clara Valley Including San Jose; Northern Salinas Valley/Hollister Valley and Carmel Valley
DESCRIPTION: * WHAT...Cold conditions with temperatures as low as 33 expected. Slightly warmer conditions will be found across portions of the northern Salinas Valley and Carmel Valley where low temperatures range from 36 to 40 degrees. * WHERE...The Santa Clara Valley, North Bay Interior Valleys and Mountains, East Bay Interior Valleys, and Northern Salinas Valley and Hollister Valley. * WHEN...From 1 AM to 9 AM PST Saturday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Prolonged exposure to the cold conditions will lead to hypothermia for people, pets, and livestock. Cold conditions may damage or kill sensitive crops, plants, and vegetation if appropriate precautions are not taken.
INSTRUCTION: Make frequent checks on older family, friends, and neighbors and ensure that they have adequate shelter and/or warmth. Check with your local, city, or county officials for information on available warming centers. Be sure to dress in layers if outdoors. Make sure that pets and livestock have adequate food, unfrozen water, and warmth. Cover or tend to sensitive crops, plants, and vegetation.
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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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