Weather Alerts for California

Recent Locations: Irvine, CA  
Current Alerts for Irvine, CA: High Surf Advisory

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

2. Winter Storm Watch for: Greater Lake Tahoe Area

3. Winter Storm Watch for: Mono

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

5. Wind Advisory for: Central Siskiyou County

6. Winter Weather Advisory for: South Central Siskiyou County

7. Winter Weather Advisory for: North Central and Southeast Siskiyou County

8. Winter Storm Warning for: Western Siskiyou County

9. Winter Storm Warning for: South Central Siskiyou County

10. Winter Storm Warning for: North Central and Southeast Siskiyou County

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

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

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

14. Winter Storm Warning for: Western Plumas County, Lassen Park

15. Winter Storm Warning for: West Slope Northern Sierra Nevada

16. Lake Wind Advisory for: Greater Lake Tahoe Area

17. Winter Storm Watch for: Sierra Nevada from Yosemite to Kings Canyon; Tulare County Mountains

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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

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Todays National Weather Map

National Weather Forecast for Tomorrow

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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

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Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

precipitation Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain