Weather Alert in California
Frost Advisory issued March 9 at 9:50PM PDT until March 10 at 9:00AM PDT by NWS Eureka CA
AREAS AFFECTED: Coastal Del Norte; Northern Humboldt Coast; Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southwestern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County
DESCRIPTION: * WHAT...Temperatures as low as 33 will result in frost formation. * WHERE...Mendocino County, Lake County, and Del Norte and Northern Humboldt Coast. * WHEN...From 3 AM to 9 AM PDT Tuesday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered. * ADDITIONAL DETAILS...*Frost formation is most likely to occur for NE Mendocino County, including: Legget, Laytonville, Covelo, Willits, and Potter Valley. Other areas in Mendocino county include: Philo and Calpella. *Frost may occur in areas of Lake (Upper Lake), Humboldt (McKinleyville, Blue Lake, and Fieldbrook), and Del Norte (Hiouchi)
INSTRUCTION: Take steps now to protect tender plants from the cold.
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Altocumulus Clouds
A wall cloud forms underneath the base of a cumulonimbus cloud,
and can be a hotbed for deadly tornadoes.
Wall clouds are formed by air flowing into the cumulonimbus clouds, which can
result in the wall cloud descending from the base of the cumulonimbus cloud, or
rising fractus clouds which join to the base of the storm cloud as the wall cloud
takes shape.
Wall clouds can be very large, and in the Northern Hemisphere they generally
form at the southern edge of cumulonimbus clouds.
Next Topic: Altocumulus Clouds
Weather Topic: What are Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
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