Weather Alerts for California

Recent Locations: Aliso Viejo, CA  

1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning

2. Freeze Warning for: Western Siskiyou County; Central Siskiyou County

3. Freeze Watch for: Northern Trinity

4. Freeze Watch for: Southern Trinity

5. Freeze Watch for: Western Siskiyou County; Central Siskiyou County

6. Frost Advisory for: Northeastern Mendocino Interior

7. Frost Advisory for: Northwestern Mendocino Interior

8. Frost Advisory for: Southeastern Mendocino Interior

9. Frost Advisory for: Southern Lake County

10. High Wind Warning for: Mojave Desert Slopes

11. Wind Advisory for: Catalina and Santa Barbara Islands; San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches

12. Wind Advisory for: Imperial County Southwest

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

14. Wind Advisory for: Joshua Tree NP West

15. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts

16. Wind Advisory for: Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley

17. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys

18. Wind Advisory for: San Gorgonio Pass Near Banning

19. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor

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

21. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

22. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

23. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP

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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 Contrails?

Home - Education - Cloud Types - Contrails

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

Weather Topic: What are Cumulus Clouds?

Home - Education - Cloud Types - Cumulus Clouds

Cumulus Clouds Next Topic: Drizzle

Cumulus clouds are fluffy and textured with rounded tops, and may have flat bottoms. The border of a cumulus cloud is clearly defined, and can have the appearance of cotton or cauliflower.

Cumulus clouds form at low altitudes (rarely above 2 km) but can grow very tall, becoming cumulus congestus and possibly the even taller cumulonimbus clouds. When cumulus clouds become taller, they have a greater chance of producing precipitation.

Next Topic: Drizzle