Weather Alerts for California

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

1. Coastal Flood Advisory for: Coastal North Bay Including Point Reyes National Seashore; North Bay Interior Valleys; San Francisco; San Francisco Bay Shoreline

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

3. Coastal Flood Advisory for: Santa Barbara County Southeastern Coast; Santa Barbara County Southwestern Coast

4. Coastal Flood Advisory for: Ventura County Beaches

5. Flood Advisory for: Fresno; Madera

6. Flood Advisory for: Fresno; Merced

7. Flood Advisory for: Monterey

8. Flood Advisory for: Riverside

9. Flood Advisory for: Santa Clara

10. Flood Advisory for: Santa Clara; Santa Cruz

11. Flood Warning for: Merced

12. Flood Warning for: San Joaquin

13. Flood Watch for: Bakersfield; Buena Vista; Buttonwillow - Lost Hills - I5; Caruthers - San Joaquin - Selma; Coalinga - Avenal; Delano-Wasco-Shafter; Fresno-Clovis; Hanford - Corcoran - Lemoore; Los Banos - Dos Palos; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Merced - Madera - Mendota; Planada - Le Grand - Snelling; South End San Joaquin Valley; Southeast San Joaquin Valley; Visalia - Porterville - Reedley; West Side Mountains South of 198; West Side Mountains north of 198; West Side of Fresno and Kings Counties

14. Flood Watch for: Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; Kern River Valley; South End Sierra Foothills; South End of the Lower Sierra

15. Freeze Watch for: Northeastern Mendocino Interior; Northern Lake County; Northwestern Mendocino Interior; Southern Lake County

16. Frost Advisory for: Carquinez Strait and Delta; Central Sacramento Valley; Motherlode; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills, Sacramento Valley; Northern Sacramento Valley; Northern San Joaquin Valley; Shasta Lake Area, Northern Shasta County; Southern Sacramento Valley

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

18. High Surf Advisory for: Orange County Coastal

19. High Surf Advisory for: San Diego County Coastal Areas

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

21. High Surf Advisory for: Santa Barbara County Southeastern Coast; Santa Barbara County Southwestern Coast

22. High Surf Advisory for: Ventura County Beaches

23. Winter Storm Warning for: Eastern San Gabriel Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor

24. Winter Storm Warning for: Fresno-Tulare Lower Sierra; Grant Grove Area; Kaiser to Rodgers Ridge; Kings Canyon NP; Mariposa-Madera Lower Sierra; San Joaquin River Canyon; Sequoia NP; South End of the Lower Sierra; South End of the Upper Sierra; Upper San Joaquin River; Yosemite NP outside of the valley; Yosemite Valley

25. Winter Storm Warning for: Northern Ventura County Mountains; Southern Ventura County Mountains

26. Winter Storm Warning for: Riverside County Mountains

27. Winter Storm Warning for: San Bernardino County Mountains

28. Winter Storm Warning for: Santa Barbara County Interior Mountains

29. Winter Weather Advisory for: Burney Basin, Eastern Shasta County; West Slope Northern Sierra Nevada; Western Plumas County, Lassen Park

30. Winter Weather Advisory for: Del Norte Interior

31. Winter Weather Advisory for: Northern Humboldt Interior; Southern Humboldt Interior

32. Winter Weather Advisory for: San Diego County Mountains

33. Winter Weather Advisory for: Western Siskiyou County

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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 Stratocumulus Clouds?

Home - Education - Cloud Types - Stratocumulus Clouds

Stratocumulus Clouds Next Topic: Stratus Clouds

Stratocumulus clouds are similar to altocumulus clouds in their fluffy appearance, but have a slightly darker shade due to their additional mass.

A good way to distinguish the two cloud types is to hold your hand out and measure the size of an individual cloud; if it is the size of your thumb it is generally an altocumulus cloud, if it is the size of your hand it is generally a stratocumulus cloud.

It is uncommon for stratocumulus clouds to produce precipitation, but if they do it is usually a light rain or snow.

Next Topic: Stratus Clouds

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds