Weather Alerts for California

Recent Locations: Los Angeles, CA  

1. Air Quality Alert for: Fresno; Kings; Madera; Merced; San Joaquin; Stanislaus; Tulare

2. Air Quality Alert for: Kern

3. Air Quality Alert for: Mariposa; Tuolumne

4. Air Quality Alert for: San Luis Obispo County Central Coast; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains

5. Air Quality Alert for: Ventura County Coast; Ventura County Coastal Valleys; Ventura County Interior Valleys; Ventura County Mountains

6. Dense Smoke Advisory for: Greater Lake Tahoe Area

7. Dense Smoke Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties; Mono; Surprise Valley California

8. Lake Wind Advisory for: Greater Lake Tahoe Area

9. Red Flag Warning for: Eastern Lassen County; Surprise Valley California

10. Red Flag Warning for: Greater Lake Tahoe; Western Lassen, Eastern Plumas, Eastern Sierra, Eastern Nevada Counties

11. Red Flag Warning for: Southern Mono County

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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 Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

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

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