Weather Alerts for California

Recent Locations: Dyke, VA Idalou, TX Sierra City, CA

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

2. Coastal Flood Advisory for: Northern Humboldt Coast

3. Flood Watch for: Coastal Del Norte; Del Norte Interior; Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior

4. Flood Watch for: Southeastern Mendocino Interior

5. Flood Watch for: Southwestern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County

6. Flood Watch for: Western Siskiyou County; Central Siskiyou County; South Central Oregon Coast; Curry County Coast; Central Douglas County; Eastern Curry County and Josephine County; Jackson County

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

8. Hydrologic Outlook for: Siskiyou, CA; Coos, OR; Curry, OR; Douglas, OR; Jackson, OR; Josephine, OR

9. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

10. Wind Advisory for: Central Siskiyou County

11. Wind Advisory for: Coastal Del Norte; Northern Humboldt Interior

12. Wind Advisory for: Del Norte Interior

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

14. Wind Advisory for: Southwestern Humboldt; Southern Humboldt Interior

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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 Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation