Weather Alert in California
Red Flag Warning issued June 29 at 12:26PM PDT until July 1 at 8:00PM PDT by NWS Sacramento CA
AREAS AFFECTED: Northern Sierra Foothills from 1000 to 3000 Ft. Includes Nevada-Yuba-Placer RU and Anador-Eldorado RU; Northern Sierra Including Lassen NP and Plumas and Lassen NF/S West of the Sierra Crest - West of Evans Peak/Grizzly Peak/Beckworth Peak
DESCRIPTION: The National Weather Service in Sacramento has issued a Red Flag Warning for thunderstorms and strong outflow winds, which is in effect from 11 AM Monday to 8 PM PDT Tuesday. * Affected Area...Fire Zone 266 Northern Sierra Foothills from 1000 to 3000 Ft. Includes portions of Shasta-Trinity and Butte Units and Fire Zone 268 Northern Sierra Including Lassen NP and Plumas and Lassen NF/S West of the Sierra Crest (West of Evans Peak-Grizzly Peak-Beckworth Peak). * Thunderstorms...Isolated to scattered coverage of a mix of wet and dry thunderstorms expected. Lightning strikes may also occur outside of main precipitation cores. Highest chances for thunderstorms in the afternoon and evening hours. * Outflow Winds...Gusty and erratic outflow winds could occur near any thunderstorm development. * Impacts...Lightning can create new fire starts and may combine with gusty outflow winds to cause a fire to rapidly grow in size and intensity.
INSTRUCTION: A Red Flag Warning means that critical fire weather conditions are either occurring now, or will shortly. A combination of lightning from dry thunderstorms on dry fuels can contribute to new fire starts.
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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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