Weather Alerts for California

Recent Locations: Point Arena, CA Commack, NY Rowland, PA

1. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

2. Coastal Flood Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

3. Coastal Flood Advisory for: Ventura County Beaches

4. High Surf Advisory for: Malibu Coast; Los Angeles County Beaches

5. High Surf Advisory for: San Diego County Coastal Areas; Orange County Coastal

6. High Surf Advisory for: San Francisco; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast

7. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

8. High Surf Advisory for: Ventura County Beaches

9. Wind Advisory for: Apple and Lucerne Valleys

10. Wind Advisory for: Coachella Valley

11. Wind Advisory for: Imperial County Southwest

12. Wind Advisory for: Joshua Tree NP West; Joshua Tree NP East; Salton Sea; Chuckwalla Mountains; Imperial County West; Chiriaco Summit; Palo Verde Valley; Chuckwalla Valley

13. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley

14. Wind Advisory for: San Diego County Deserts

15. Wind Advisory for: San Gorgonio Pass Near Banning

16. Wind Advisory for: West Side Mountains north of 198; West Side Mountains South of 198; Buena Vista; Indian Wells Valley; Mojave Desert Slopes; Mojave Desert

17. Wind Advisory for: Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin

18. Winter Storm Warning for: Grapevine

19. Winter Storm Warning for: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra; Yosemite NP outside of the valley; Yosemite Valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra

20. Winter Storm Warning for: Northern Ventura County Mountains; Eastern San Gabriel Mountains

21. Winter Storm Warning for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities

22. Winter Storm Warning for: Riverside County Mountains

23. Winter Storm Warning for: San Bernardino County Mountains

24. Winter Storm Warning for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Interstate 5 Corridor

25. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Northern Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

26. Winter Storm Warning for: South Central Siskiyou County; North Central and Southeast Siskiyou County

27. Winter Storm Warning for: Western San Gabriel Mountains and Highway 14 Corridor; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills

28. Winter Storm Warning for: Western Siskiyou County

29. Winter Weather Advisory for: Central Siskiyou County

30. Winter Weather Advisory for: Eastern Santa Clara Hills

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

32. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties

33. Winter Weather Advisory for: Mono

34. Winter Weather Advisory for: Northeast Siskiyou and Northwest Modoc Counties; Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

35. Winter Weather Advisory for: San Diego County Mountains

36. Winter Weather Advisory for: Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park

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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