Weather Alerts for California

Recent Locations: Vallejo, CA  

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

2. Flood Advisory for: San Bernardino, CA

3. Flood Watch for: Catalina and Santa Barbara Islands; Santa Clarita 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; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley

4. Flood Watch for: San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Coastal; Orange County Inland

5. Frost Advisory for: 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

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

7. High Surf Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Ventura County Beaches; Malibu Coast; Los Angeles County Beaches

8. High Wind Warning for: Mojave Desert Slopes

9. High Wind Watch for: Coastal Del Norte

10. Special Weather Statement for: Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter

11. Special Weather Statement for: Cuyama Valley; 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; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; 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; 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; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley; Los Angeles County San Gabriel Valley; San Miguel and Santa Rosa Islands; Santa Cruz and Anacapa Islands

12. Special Weather Statement for: Planada - Le Grand - Snelling; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra

13. Special Weather Statement for: San Diego County Coastal Areas; San Diego County Inland Valleys

14. Special Weather Statement for: West Side of Fresno and Kings Counties; Hanford - Corcoran - Lemoore

15. Wind Advisory for: Apple and Lucerne Valleys

16. Wind Advisory for: Central Siskiyou County

17. Wind Advisory for: Imperial County Southwest

18. Wind Advisory for: Indian Wells Valley; Mojave Desert

19. Wind Advisory for: Morongo Basin

20. Wind Advisory for: Northern Humboldt Coast; Southwestern Humboldt; Southern Humboldt Interior

21. Wind Advisory for: Owens Valley; Death Valley National Park

22. 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

23. Wind Advisory for: San Diego County Deserts

24. Wind Advisory for: San Gorgonio Pass Near Banning

25. Wind Advisory for: Western Mojave Desert

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

27. Winter Storm Warning for: Northern Trinity; Southern Trinity

28. Winter Storm Warning for: San Bernardino County Mountains; Riverside County Mountains

29. Winter Storm Warning for: Santa Barbara County Interior 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

30. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Mountains Southwestern Shasta County to Western Colusa County

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

32. Winter Storm Warning for: West Slope Northern Sierra Nevada

33. Winter Storm Warning for: Western Plumas County/Lassen Park

34. Winter Storm Warning for: Western Siskiyou County

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

36. Winter Storm Warning for: 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

37. Winter Storm Watch for: Northeast Foothills/Sacramento Valley

38. Winter Storm Watch for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Mountains Southwestern Shasta County to Western Colusa County

39. Winter Storm Watch for: West Slope Northern Sierra Nevada

40. Winter Storm Watch for: Western Plumas County/Lassen Park

41. Winter Weather Advisory for: Central Siskiyou County

42. Winter Weather Advisory for: Del Norte Interior; Northern Humboldt Interior

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

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

45. Winter Weather Advisory for: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra

46. Winter Weather Advisory for: Mono

47. Winter Weather Advisory for: Northeastern Mendocino Interior; Northern Lake County

48. Winter Weather Advisory for: Northwestern Mendocino Interior; Southern Lake County

49. Winter Weather Advisory for: Piute Walker Basin; Tehachapi; Grapevine; Frazier Mountain Communities

50. Winter Weather Advisory for: San Diego County Mountains

51. Winter Weather Advisory for: San Luis Obispo County Mountains

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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

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

North America Water Vapor (Moisture)

This map shows recent moisture content over North America. Bright and colored areas show high moisture (ie, clouds); brown indicates very little moisture present; black indicates no moisture.

North American Water Vapor Map

Weather Topic: What is Rain?

Home - Education - Precipitation - Rain

Rain Next Topic: Shelf Clouds

Precipitation in the form of water droplets is called rain. Rain generally has a tendency to fall with less intensity over a greater period of time, and when rainfall is more severe it is usually less sustained.

Rain is the most common form of precipitation and happens with greater frequency depending on the season and regional influences. Cities have been shown to have an observable effect on rainfall, due to an effect called the urban heat island. Compared to upwind, monthly rainfall between twenty and forty miles downwind of cities is 30% greater.

Next Topic: Shelf Clouds

Weather Topic: What is Sleet?

Home - Education - Precipitation - Sleet

Sleet Next Topic: Snow

Sleet is a form of precipitation in which small ice pellets are the primary components. These ice pellets are smaller and more translucent than hailstones, and harder than graupel. Sleet is caused by specific atmospheric conditions and therefore typically doesn't last for extended periods of time.

The condition which leads to sleet formation requires a warmer body of air to be wedged in between two sub-freezing bodies of air. When snow falls through a warmer layer of air it melts, and as it falls through the next sub-freezing body of air it freezes again, forming ice pellets known as sleet. In some cases, water droplets don't have time to freeze before reaching the surface and the result is freezing rain.

Next Topic: Snow