Weather Alerts for California

Recent Locations: Staten Island, NY San Fernando, CA

1. Air Quality Alert for: Coachella Valley

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

3. High Wind Warning for: Mojave Desert Slopes

4. Wind Advisory for: Apple and Lucerne Valleys; San Diego County Deserts; San Gorgonio Pass Near Banning

5. Wind Advisory for: Death Valley National Park; Western Mojave Desert; Morongo Basin

6. Wind Advisory for: Imperial County Southwest

7. Wind Advisory for: Imperial County West

8. Wind Advisory for: Imperial Valley

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

10. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County

11. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

12. Winter Weather Advisory for: Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains

13. Winter Weather Advisory for: Mono

14. Winter Weather Advisory for: San Bernardino County Mountains

15. Winter Weather Advisory for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains

16. Winter Weather Advisory for: South End of the Upper Sierra; Piute Walker Basin; Tehachapi; Grapevine; Frazier Mountain Communities

17. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

18. Winter Weather Advisory for: Yosemite NP outside of the valley; San Joaquin River Canyon; 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).

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 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