Weather Alerts for California

Recent Locations: Valley, NE Grayson, KY Coloma, CA

1. Air Quality Alert for: Imperial County Southwest; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley

2. Freeze Warning for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County

3. Freeze Warning for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County; Southern Lake County

4. Freeze Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties

5. Freeze Warning for: Southeastern Mendocino Interior

6. Freeze Warning for: Surprise Valley California; Northern Washoe County

7. Freeze Warning for: Western Siskiyou County; Eastern Curry County and Josephine County; Jackson County

8. Frost Advisory for: Coastal Del Norte; Northern Humboldt Coast; Southwestern Humboldt; Mendocino Coast

9. Frost Advisory for: Coastal Del Norte; Northern Humboldt Coast; Southwestern Humboldt; Mendocino Coast

10. Frost Advisory for: Southwestern Mendocino Interior

11. Frost Advisory for: Southwestern Mendocino Interior

12. Frost Advisory for: Western Siskiyou County; Eastern Curry County and Josephine County; Jackson County

13. Wind Advisory for: Apple and Lucerne Valleys

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

15. Wind Advisory for: Interstate 5 Corridor; Western Antelope Valley Foothills

16. Wind Advisory for: Mojave Desert Slopes

17. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta

18. Wind Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

19. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range

20. Wind Advisory for: Santa Lucia Mountains

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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

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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