Weather Alerts for California
1. Air Quality Alert for: Coachella Valley
2. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
3. Beach Hazards Statement for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast
4. Cold Weather Advisory for: Marin Coastal Range; Sonoma Coastal Range; Coastal North Bay Including Point Reyes National Seashore; San Francisco Bay Shoreline; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay
5. Cold Weather Advisory for: Southwestern Humboldt; Mendocino Coast; Southwestern Mendocino Interior; Southeastern Mendocino Interior; Southern Lake County
6. Extreme Cold Warning for: North Bay Interior Mountains; North Bay Interior Valleys; East Bay Interior Valleys; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
7. Freeze Watch for: Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley
8. High Surf Advisory for: Malibu Coast; Los Angeles County Beaches
9. High Surf Advisory for: San Diego County Coastal Areas; Orange County Coastal
10. 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
11. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
12. High Surf Advisory for: Ventura County Beaches
13. High Wind Warning for: Cuyama Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains; Antelope Valley
14. Wind Advisory for: Apple and Lucerne Valleys
15. Wind Advisory for: Catalina and Santa Barbara Islands; Santa Clarita Valley; San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Ventura County Beaches; Ventura County Inland Coast; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Southern Ventura County Mountains; Los Angeles County San Gabriel Valley
16. Wind Advisory for: Coachella Valley
17. Wind Advisory for: Imperial County Southwest
18. Wind Advisory for: Indian Wells Valley; Mojave Desert
19. Wind Advisory for: Joshua Tree NP West; Chuckwalla Mountains; Chiriaco Summit
20. Wind Advisory for: Mojave Desert Slopes
21. Wind Advisory for: Morongo Basin
22. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley
23. Wind Advisory for: San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Santa Ana Mountains and Foothills; Orange County Coastal; Orange County Inland
24. Wind Advisory for: San Diego County Deserts
25. Wind Advisory for: San Gorgonio Pass Near Banning
26. Wind Advisory for: Western Mojave Desert
27. Winter Storm Warning for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior
28. Winter Storm Warning for: Grapevine
29. 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
30. Winter Storm Warning for: Northern Trinity; Southern Trinity
31. Winter Storm Warning for: Northern Ventura County Mountains; Eastern San Gabriel Mountains
32. Winter Storm Warning for: Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County
33. Winter Storm Warning for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities
34. Winter Storm Warning for: Riverside County Mountains
35. Winter Storm Warning for: San Bernardino County Mountains
36. Winter Storm Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Interstate 5 Corridor
37. 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
38. Winter Storm Warning for: South Central Siskiyou County; North Central and Southeast Siskiyou County
39. Winter Storm Warning for: Southwestern Humboldt
40. Winter Storm Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills
41. Winter Storm Warning for: Western Siskiyou County
42. Winter Weather Advisory for: Central Siskiyou County
43. Winter Weather Advisory for: Coastal Del Norte; Northern Humboldt Coast
44. Winter Weather Advisory for: Eastern Mojave Desert, Including the Mojave National Preserve
45. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County
46. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
47. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
48. Winter Weather Advisory for: Modoc County; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County
49. Winter Weather Advisory for: Mono
50. Winter Weather Advisory for: Northeast Siskiyou and Northwest Modoc Counties; Klamath Basin
51. Winter Weather Advisory for: San Diego County Mountains
52. 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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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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