Weather Alert in California
Winter Weather Advisory issued February 19 at 12:25AM PST until February 19 at 10:00AM PST by NWS Medford OR
AREAS AFFECTED: Northeast Siskiyou and Northwest Modoc Counties; Klamath Basin
DESCRIPTION: * WHAT...Snow. Additional snow accumulations 2 to 4 inches. A majority of the snow is expected from 3 AM PST to 9 AM PST on Thursday morning, with light snow showers then tapering off through the rest of the morning. * WHERE...In California, Northeast Siskiyou and Northwest Modoc Counties. In Oregon, the Klamath Basin. Including the locations of...Dorris, Macdoel, Newell, Tulelake, Altamont, Klamath Falls, Midland, and Olene. This also includes the following passes or notable locations... Cedar Pass on state highway 239 at 6323 ft. Warner Mountain Summit on state highway 140 at 5850 ft. * WHEN...Until 10 AM PST this morning. * IMPACTS...Plan on slippery road conditions and delays in your morning commute. * ADDITIONAL DETAILS...Visit weather.gov/mfr/winter for additional snow probabilities
INSTRUCTION: Slow down and use caution while traveling. In California, call 511 or visit quickmap.dot.ca.gov for road information. In Oregon, call 511 or visit tripcheck.com for road information.
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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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