Weather Alerts for California
1. Red Flag Warning for: Interior Mendocino; W Mendocino NF, E Mendocino Unit
2. Red Flag Warning for: North Bay Mountains
3. Red Flag Warning for: East Bay Hills and the Diablo Range
4. Red Flag Warning for: Central Sacramento Valley including Glenn, Colusa, Yuba, Northern Sutter, Butte County Below 1000 Ft; E Mendocino NF; Eastern Delta; Eastern Portion of Shasta, Trinity NF; Lake County Portion of Lake-Nappa-Sonoma RU; Northern Motherlode From 1000 to 3000 Ft. From Yuba To Amador Counties; Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft; 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; Southern Motherlode From 1000 to 3000 Ft, Calaveras and Toulumne Counties; Southern Sacramento Valley In Yolo, Sacramento, Far Western Placer, Southern Sutter and Solano County Below 1000 Ft - Excludes the Delta; Southern and Eastern Mendocino NF, Southeast Edge Shasta, Trinity NF and Western Portions of Tahima, Glenn RU; Stanislaus National Forest; Tahoe - Eldorado National Forest
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North America Water Vapor (Moisture)
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Weather Topic: What are Wall Clouds?
Home - Education - Cloud Types - Wall Clouds
Next Topic: Condensation
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: Condensation
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not impact human habitation in a
negative way. The exception to this is freezing drizzle, a condition where drizzle freezes immediately
upon reaching earth's surface. Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
