Weather Alert in California
Winter Weather Advisory issued April 26 at 1:37PM PDT until April 27 at 11:00AM PDT by NWS Sacramento CA
AREAS AFFECTED: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
DESCRIPTION: * WHAT...Moderate snow expected above 6000 feet. Additional snow accumulations of 5 to 10 inches. Winds gusting up to 35 mph. * WHERE...West Slope Northern Sierra Nevada and Western Plumas County/Lassen Park Counties. * WHEN...Until 11 AM PDT Sunday. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact weekend travel. * ADDITIONAL DETAILS...Snow levels around 5000-6000 feet. Light snowfall accumulations possible down to around 5500 feet.
INSTRUCTION: Check the latest road conditions from Caltrans online at quickmap.dot.ca.gov or dial 5 1 1.
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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
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
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