Weather Alerts for California
1. Avalanche Watch for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
2. Avalanche Watch for: Mono
3. Beach Hazards Statement for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast
4. Coastal Flood Advisory for: Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
5. Coastal Flood Advisory for: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline
6. Flood Watch for: Catalina and Santa Barbara Islands; Santa Clarita Valley; Santa Ynez Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; 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; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley; San Miguel and Santa Rosa Islands; Santa Cruz and Anacapa Islands
7. High Surf Advisory for: San Diego County Coastal Areas; Orange County Coastal
8. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches; Malibu Coast; Los Angeles County Beaches
9. High Surf Advisory for: Ventura County Beaches
10. Wind Advisory for: Apple and Lucerne Valleys
11. Wind Advisory for: Apple and Lucerne Valleys
12. Wind Advisory for: Imperial County Southwest
13. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley
14. Wind Advisory for: Owens Valley; Death Valley National Park
15. 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
16. Wind Advisory for: San Diego County Deserts
17. Wind Advisory for: San Diego County Deserts
18. Wind Advisory for: San Diego County Mountains
19. Wind Advisory for: San Diego County Mountains
20. Wind Advisory for: San Gorgonio Pass Near Banning
21. Wind Advisory for: San Gorgonio Pass Near Banning
22. Wind Advisory for: West Side Mountains north of 198; West Side Mountains South of 198; Buena Vista; Indian Wells Valley; Mojave Desert Slopes; Mojave Desert
23. Winter Storm Warning for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior
24. Winter Storm Warning for: Eastern Sierra Slopes of Inyo County
25. Winter Storm Warning for: Grapevine
26. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
27. Winter Storm Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties
28. 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
29. Winter Storm Warning for: Mono
30. Winter Storm Warning for: Northern Sacramento Valley
31. Winter Storm Warning for: Northern Trinity; Southern Trinity
32. Winter Storm Warning for: Northern Ventura County Mountains; Eastern San Gabriel Mountains
33. Winter Storm Warning for: Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County
34. Winter Storm Warning for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities
35. Winter Storm Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Interstate 5 Corridor
36. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
37. Winter Storm Warning for: South Central Siskiyou County; North Central and Southeast Siskiyou County
38. Winter Storm Warning for: Southwestern Humboldt
39. Winter Storm Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills
40. Winter Storm Warning for: Western Siskiyou County
41. Winter Storm Warning for: White Mountains of Inyo County
42. Winter Storm Watch for: Owens Valley
43. Winter Weather Advisory for: Central Siskiyou County
44. Winter Weather Advisory for: Coastal Del Norte; Northern Humboldt Coast
45. Winter Weather Advisory for: Eastern Santa Clara Hills
46. 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
47. 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
48. Winter Weather Advisory for: Surprise Valley California
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North America Water Vapor (Moisture)
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Weather Topic: What is Precipitation?
Home - Education - Precipitation - Precipitation
Next Topic: Rain
Precipitation can refer to many different forms of water that
may fall from clouds. Precipitation occurs after a cloud has become saturated to
the point where its water particles are more dense than the air below the cloud.
In most cases, precipitation will reach the ground, but it is not uncommon for
precipitation to evaporate before it reaches the earth's surface.
When precipitation evaporates before it contacts the ground it is called Virga.
Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog
and mist are not considered precipitation because the water vapor which
constitutes them isn't dense enough to fall to the ground.
Next Topic: Rain
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
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