Weather Alerts for California

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Current Alerts for Los Angeles, CA: High Surf Advisory

1. High Surf Advisory for: Catalina and Santa Barbara Islands; Los Angeles County Coast including Downtown Los Angeles; Ventura County Coast

2. High Surf Advisory for: Coastal Del Norte; Northern Humboldt Coast

3. High Surf Advisory for: Coastal North Bay Including Point Reyes National Seashore; Northern Monterey Bay; San Francisco; San Francisco Peninsula Coast; Southern Monterey Bay and Big Sur Coast

4. High Surf Advisory for: Orange County Coastal; San Diego County Coastal Areas

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

6. High Surf Advisory for: Santa Barbara County South Coast

7. Lake Wind Advisory for: Greater Lake Tahoe Area

8. Special Weather Statement for: Greater Lake Tahoe Area; Lassen-Eastern Plumas-Eastern Sierra Counties; Mono; Surprise Valley California

9. Wind Advisory for: Apple and Lucerne Valleys; Coachella Valley; Riverside County Mountains; San Bernardino County Mountains; San Diego County Deserts; San Diego County Mountains; San Gorgonio Pass Near Banning

10. Wind Advisory for: Eastern Mojave Desert, Including the Mojave National Preserve; Western Mojave Desert

11. Wind Advisory for: Eastern Sierra Slopes of Inyo County; Owens Valley

12. Wind Advisory for: Imperial County Southwest

13. Winter Weather Advisory for: Central Sierra

14. Winter Weather Advisory for: Greater Lake Tahoe Area

15. Winter Weather Advisory for: Modoc County

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

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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 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