Weather Alerts for California

Recent Locations: Decatur, AL Monee, IL Snelling, 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

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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 Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

Mammatus Clouds Next Topic: Nimbostratus Clouds

A mammatus cloud is a cloud with a unique feature which resembles a web of pouches hanging along the base of the cloud.

In the United States, mammatus clouds tend to form in the warmer months, commonly in the Midwest and eastern regions.

While they usually form at the bottom of a cumulonimbis cloud, they can also form under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds warn that severe weather is close.

Next Topic: Nimbostratus Clouds

Weather Topic: What is Precipitation?

Home - Education - 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