Weather Alerts for California

Recent Locations: Moonachie, NJ   Jericho, NY   Empire, CA  

1. Avalanche Warning for: Eastern Sierra Slopes of Inyo County

2. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

3. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

4. Avalanche Warning for: Mono

5. Beach Hazards Statement for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast

6. Coastal Flood Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

7. Coastal Flood Advisory for: Ventura County Beaches

8. Cold Weather Advisory for: North Bay Interior Mountains; North Bay Interior Valleys; Southern Salinas Valley/Arroyo Seco and Lake San Antonio

9. Cold Weather Advisory for: Santa Cruz Mountains; Santa Clara Valley Including San Jose

10. Cold Weather Advisory for: Southeastern Mendocino Interior; Southern Lake County

11. Extreme Cold Warning for: Eastern Santa Clara Hills

12. Extreme Cold Warning for: Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park

13. Flood Advisory for: Los Angeles, CA

14. Flood Advisory for: Los Angeles, CA; Ventura, CA

15. Flood Advisory for: San Luis Obispo, CA; Santa Barbara, CA

16. Flood Watch for: Santa Clarita Valley; 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; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley; Los Angeles County San Gabriel Valley

17. High Surf Advisory for: Malibu Coast; Los Angeles County Beaches

18. High Surf Advisory for: San Diego County Coastal Areas; Orange County Coastal

19. 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

20. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

21. High Surf Advisory for: Ventura County Beaches

22. High Wind Warning for: Antelope Valley

23. Severe Thunderstorm Warning for: Orange, CA; Riverside, CA; San Bernardino, CA; San Diego, CA

24. Special Weather Statement for: Southwestern Humboldt

25. Wind Advisory for: Apple and Lucerne Valleys

26. Wind Advisory for: Coachella Valley

27. Wind Advisory for: Imperial County Southwest

28. 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

29. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley

30. 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

31. Wind Advisory for: San Diego County Deserts

32. Wind Advisory for: San Gorgonio Pass Near Banning

33. Wind Advisory for: Santa Clarita Valley; Santa Barbara County Southeastern Coast; 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; Los Angeles County San Gabriel Valley

34. 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

35. Wind Advisory for: Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin

36. Winter Storm Warning for: Eastern Sierra Slopes of Inyo County

37. Winter Storm Warning for: Grapevine

38. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

39. Winter Storm Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties

40. 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

41. Winter Storm Warning for: Mono

42. Winter Storm Warning for: Northern Ventura County Mountains; Eastern San Gabriel Mountains

43. Winter Storm Warning for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities

44. Winter Storm Warning for: Riverside County Mountains

45. Winter Storm Warning for: San Bernardino County Mountains

46. Winter Storm Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Interstate 5 Corridor

47. 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

48. Winter Storm Warning for: South Central Siskiyou County; North Central and Southeast Siskiyou County

49. Winter Storm Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills

50. Winter Storm Warning for: Western Siskiyou County

51. Winter Storm Warning for: White Mountains of Inyo County

52. Winter Weather Advisory for: Central Siskiyou County

53. Winter Weather Advisory for: Eastern Mojave Desert, Including the Mojave National Preserve

54. Winter Weather Advisory for: Eastern Santa Clara Hills

55. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

56. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties

57. Winter Weather Advisory for: Mono

58. 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

59. Winter Weather Advisory for: Owens Valley

60. Winter Weather Advisory for: San Diego County Mountains

61. 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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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

Current U.S. National Radar

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Today's National Weather Map

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North America Water Vapor (Moisture)

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North American Water Vapor Map

Weather Topic: What is Precipitation?

Home - Education - Precipitation - 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

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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