Weather Alerts for California
1. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
2. Coastal Flood Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
3. Coastal Flood Advisory for: Ventura County Beaches
4. High Surf Advisory for: Malibu Coast; Los Angeles County Beaches
5. High Surf Advisory for: San Diego County Coastal Areas; Orange County Coastal
6. High Surf Advisory for: San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
7. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
8. High Surf Advisory for: Ventura County Beaches
9. Wind Advisory for: Apple and Lucerne Valleys
10. Wind Advisory for: Coachella Valley
11. Wind Advisory for: Imperial County Southwest
12. Wind Advisory for: Joshua Tree NP West; Joshua Tree NP East; Salton Sea; Chuckwalla Mountains; Imperial County West; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley
13. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley
14. Wind Advisory for: San Diego County Deserts
15. Wind Advisory for: San Gorgonio Pass Near Banning
16. Wind Advisory for: Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin
17. Winter Storm Warning for: Grapevine
18. Winter Storm Warning for: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra; Yosemite NP outside of the valley; Yosemite Valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra
19. Winter Storm Warning for: Northern Ventura County Mountains; Eastern San Gabriel Mountains
20. Winter Storm Warning for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities
21. Winter Storm Warning for: Riverside County Mountains
22. Winter Storm Warning for: San Bernardino County Mountains
23. Winter Storm Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Interstate 5 Corridor
24. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Northern Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
25. Winter Storm Warning for: South Central Siskiyou County; North Central and Southeast Siskiyou County
26. Winter Storm Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills
27. Winter Storm Warning for: Western Siskiyou County
28. Winter Weather Advisory for: Central Siskiyou County
29. Winter Weather Advisory for: Eastern Santa Clara Hills
30. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
31. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
32. Winter Weather Advisory for: Mono
33. Winter Weather Advisory for: Northeast Siskiyou and Northwest Modoc Counties; Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
34. Winter Weather Advisory for: San Diego County Mountains
35. Winter Weather Advisory for: Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
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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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