Weather Alerts for California

Recent Locations: Colchester, VT Star, MS San Bruno, CA

1. Dense Fog Advisory for: Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Bakersfield; Southeast San Joaquin Valley

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

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

4. Winter Storm Watch for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior

5. Winter Storm Watch for: Eastern Sierra Slopes of Inyo County

6. Winter Storm Watch for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

7. Winter Storm Watch for: Lassen-Eastern Plumas-Eastern Sierra Counties

8. Winter Storm Watch 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; Piute Walker Basin

9. Winter Storm Watch for: Mono

10. Winter Storm Watch for: Northern Trinity; Southern Trinity

11. Winter Storm Watch for: Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County

12. Winter Storm Watch 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

13. Winter Storm Watch for: South Central Siskiyou County; North Central and Southeast Siskiyou County

14. Winter Storm Watch for: South Central Siskiyou County; North Central and Southeast Siskiyou County

15. Winter Storm Watch for: Western Siskiyou County

16. Winter Storm Watch for: Western Siskiyou County

17. Winter Storm Watch for: White Mountains of Inyo County

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Current U.S. National Radar--Current

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National Weather Forecast--Current

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National Weather Forecast for Tomorrow

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

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.

Weather Topic: What are Altocumulus Clouds?

Home - Education - Cloud Types - Altocumulus Clouds

Next Topic: Altostratus Clouds

Similar to cirrocumulus clouds, altocumulus clouds are characterized by cloud patches. They are distinguished by larger cloudlets than cirrocumulus clouds but are still smaller than stratocumulus clouds.

Altocumulus clouds most commonly form in middle altitudes (between 2 and 5 km) and may resemble, at times, the shape of a flying saucer. These uncommon formations, called altocumulus lenticularis, are created by uplift in the atmosphere and are most often seen in close proximity to mountains.

Next Topic: Altostratus Clouds

Weather Topic: What are Cirrocumulus Clouds?

Home - Education - Cloud Types - Cirrocumulus Clouds

Next Topic: Cirrostratus Clouds

Cirrocumulus clouds form at high altitudes (usually around 5 km) and have distinguishing characteristics displayed in a fine layer of small cloud patches. These small cloud patches are sometimes referred to as "cloudlets" in relation to the whole cloud formation.

Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the water droplets in the cloud freeze into ice crystals and the cloud becomes a cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud formations generally pass rapidly.

Next Topic: Cirrostratus Clouds