Weather Alerts for California
1. Air Quality Alert for: Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley
2. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire; Riverside County Mountains; Coachella Valley; San Gorgonio Pass Near Banning
3. Frost Advisory for: Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County
4. High Wind Warning for: Malibu Coast; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area
5. High Wind Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
6. High Wind Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
7. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
8. Wind Advisory for: Catalina and Santa Barbara Islands; Los Angeles County Beaches; Palos Verdes Hills
9. Wind Advisory for: Eastern Sierra Slopes of Inyo County
10. Wind Advisory for: Joshua Tree NP West; Joshua Tree NP East; Chuckwalla Mountains; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley
11. Wind Advisory for: Mono
12. Wind Advisory for: Owens Valley; White Mountains of Inyo County; Death Valley National Park; Morongo Basin; Lincoln County; Western Clark and Southern Nye County
13. Wind Advisory for: Piute Walker Basin; Tehachapi; Mojave Desert Slopes
14. Wind Advisory for: Riverside County Mountains; San Gorgonio Pass Near Banning
15. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
16. Wind Advisory for: San Diego County Mountains; San Diego County Deserts
17. Wind Advisory for: Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast
18. Wind Advisory for: Santa Barbara County Southeastern Coast; Lake Casitas; Ojai Valley
19. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range
20. Wind Advisory for: Santa Clarita Valley; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains
21. Wind Advisory for: Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
22. Wind Advisory for: Western Mojave Desert
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North America Water Vapor (Moisture)
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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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