Weather Alerts for California

Recent Locations: Homestead, IA Sumner, GA Tujunga, CA

1. Air Quality Alert for: Coachella Valley

2. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley

3. Freeze Warning for: Western Siskiyou County

4. Frost Advisory for: Del Norte Interior; Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior; Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Southwestern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County

5. High Wind Warning for: Mojave Desert Slopes

6. High Wind Warning for: Santa Susana Mountains

7. High Wind Warning for: Western Santa Monica Mountains Recreational Area; Western San Gabriel Mountains and Highway 14 Corridor

8. Lake Wind Advisory for: Kern River Valley

9. Wind Advisory for: Eastern San Gabriel Mountains

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

11. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Apple and Lucerne Valleys; Coachella Valley; San Diego County Deserts

12. Wind Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire; Santa Ana Mountains and Foothills; Orange County Inland

13. Wind Advisory for: San Bernardino County Mountains; San Gorgonio Pass Near Banning

14. Wind Advisory for: San Bernardino County Mountains; San Gorgonio Pass Near Banning

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

16. Wind Advisory for: Santa Clarita Valley; Ventura County Beaches; Ventura County Inland Coast; Central Ventura County Valleys; Calabasas and Agoura Hills; Western San Fernando Valley; Southeastern Ventura County Valleys

17. Wind Advisory for: Santa Susana Mountains

18. Wind Advisory for: Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains

19. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor

20. Wind Advisory for: Western Antelope Valley Foothills; Antelope Valley

21. Wind Advisory for: Western Mojave Desert

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Current U.S. National Radar--Current

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National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

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 Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

Weather Topic: What are Contrails?

Home - Education - Cloud Types - Contrails

Next Topic: Cumulonimbus Clouds

A contrail is an artificial cloud, created by the passing of an aircraft.

Contrails form because water vapor in the exhaust of aircraft engines is suspended in the air under certain temperatures and humidity conditions. These contrails are called exhaust contrails.

Another type of contrail can form due to a temporary reduction in air pressure moving over the plane's surface, causing condensation. These are called aerodynamic contrails.

When you can see your breath on a cold day, it is also because of condensation. The reason contrails last longer than the condensation from your breath is because the water in contrails freezes into ice particles.

Next Topic: Cumulonimbus Clouds