Weather Alerts for California

Recent Locations: San Francisco, CA  
Current Alerts for San Francisco, CA: Coastal Flood Warning High Surf Advisory
High Surf Warning

1. Air Quality Alert for: Catalina and Santa Barbara Islands; Santa Clarita Valley; 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; Santa Susana Mountains; Los Angeles County San Gabriel Valley

2. Air Quality Alert for: Catalina and Santa Barbara Islands; Santa Clarita Valley; 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; Santa Susana Mountains; Los Angeles County San Gabriel Valley

3. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire; Riverside County Mountains; San Gorgonio Pass Near Banning; Orange County Coastal; Orange County Inland

4. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire; Riverside County Mountains; San Gorgonio Pass Near Banning; Orange County Coastal; Orange County Inland

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

6. Coastal Flood Advisory for: Ventura County Beaches

7. Coastal Flood Warning 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

8. High Surf Advisory for: Catalina and Santa Barbara Islands; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; 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 Warning 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

12. High Surf Warning for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

13. High Surf Warning for: Ventura County Beaches

14. High Wind Warning for: Central Siskiyou County

15. Wind Advisory for: Central Siskiyou County

16. Wind Advisory for: Coastal Del Norte

17. Wind Advisory for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior

18. Wind Advisory for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior

19. Wind Advisory for: Modoc County; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

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

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

22. Winter Weather Advisory for: Mono

23. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

24. Winter Weather Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP

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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 are Cirrostratus Clouds?

Home - Education - Cloud Types - Cirrostratus Clouds

Cirrostratus Clouds Next Topic: Cirrus Clouds

Cirrostratus clouds are high, thin clouds that form above 20,000 feet and are made mostly of ice crystals. They sometimes look like giant feathers, horse tails, or curls of hair in the sky. These clouds are pushed by the jet stream and can move at high speeds reaching 100 mph.

What do they indicate?
They indicate that a precipitation is likely within 24 hours.

Next Topic: Cirrus Clouds

Weather Topic: What is Condensation?

Home - Education - Precipitation - Condensation

Condensation Next Topic: Contrails

Condensation is the process which creates clouds, and therefore it is a crucial process in the water cycle. Condensation is the change of matter from a state of gas into a state of liquid, and it happens because water molecules release heat into the atmosphere and become organized into a more closely packed structure, what we might see as water droplets.

Water is always present in the air around us as a vapor, but it's too small for us to see. When water undergoes the process of condensation it becomes organized into visible water droplets. You've probably seen condensation happen before on the surface of a cold drink!

Next Topic: Contrails