Weather Alert in California
Cold Weather Advisory issued February 21 at 1:25AM PST until February 21 at 10:00AM PST by NWS Hanford CA
AREAS AFFECTED: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra; Yosemite NP outside of the valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra
DESCRIPTION: * WHAT...Low temperatures from zero to ten degrees with isolated locations reaching 5 degrees below zero above 6,000 feet of the Sierra Nevada. Low temperatures of 10 to 20 degrees in the Sierra Nevada below 6,000 feet into the adjacent foothills. * WHERE...Sierra Nevada and adjacent foothills. * WHEN...Until 10 AM PST this morning. * IMPACTS...Dangerous frostbite possible on unprotected skin, and hypothermia may result if precautions are not taken. Wind chills reaching below zero degrees this morning.
INSTRUCTION: Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves.
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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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