Weather Alerts for California

Recent Locations: Limon, CO Novi, MI Sheridan, CA

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

2. Air Quality Alert for: Los Angeles County San Gabriel Valley

3. Freeze Watch for: Western Siskiyou County

4. High Wind Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties

5. High Wind Warning for: Mojave Desert Slopes

7. High Wind Watch for: Santa Susana Mountains

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

9. Wind Advisory for: Central Siskiyou County

10. Wind Advisory for: Coastal Del Norte; Del Norte Interior

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

12. Wind Advisory for: Modoc County

13. Wind Advisory for: San Bernardino County Mountains; Riverside County Mountains; San Diego County Mountains; Apple and Lucerne Valleys; Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning

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

15. Wind Advisory for: Santa Susana Mountains

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

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

18. Wind Advisory for: Surprise Valley California; Northern Washoe County

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

20. Wind Advisory for: Western Mojave Desert

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

22. Winter Weather Advisory for: Modoc County

23. Winter Weather Advisory for: Northern Trinity

24. Winter Weather Advisory for: West Slope Northern Sierra Nevada

25. Winter Weather Advisory for: Western Siskiyou County

26. Winter Weather Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River

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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