Weather Alerts for California

Recent Locations: Hydesville, CA Niantic, IL Levant, ME

1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning

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

3. Flood Advisory for: Amador, CA; Calaveras, CA; El Dorado, CA; Nevada, CA; Placer, CA; Sacramento, CA; San Joaquin, CA; Stanislaus, CA; Sutter, CA; Tuolumne, CA; Yolo, CA

4. High Wind Warning for: Death Valley National Park; Esmeralda and Central Nye County

5. Severe Thunderstorm Warning for: Butte, CA; Glenn, CA; Tehama, CA

6. Severe Thunderstorm Warning for: Fresno, CA; Madera, CA

7. Severe Thunderstorm Warning for: Fresno, CA; Madera, CA

8. Severe Thunderstorm Warning for: Madera, CA

9. Special Weather Statement for: Merced - Madera - Mendota; Planada - Le Grand - Snelling; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra

10. Wind Advisory for: Apple and Lucerne Valleys; San Diego County Deserts

11. Wind Advisory for: Eastern Sierra Slopes of Inyo County; White Mountains of Inyo County; Owens Valley South; Owens Valley North; Lincoln County

12. Wind Advisory for: Imperial County Southwest

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

14. Wind Advisory for: Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley

15. Wind Advisory for: Joshua Tree NP West

16. Wind Advisory for: Mojave Desert Slopes

17. Wind Advisory for: Riverside County Mountains; San Diego County Mountains

18. Wind Advisory for: San Bernardino County Mountains

19. Wind Advisory for: San Gorgonio Pass Near Banning

20. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains

21. Winter Storm Warning for: Lassen Volcanic National Park; Sierra Nevada of Tehama-Butte-Plumas Counties Above 3000 ft; Sierra Nevada of Sierra-Nevada-Placer Counties Above 5000 ft Including Interstate 80; Sierra Nevada of El Dorado-Amador-Northern Alpine Counties Above 5000 ft Including Highway 50; Sierra Nevada of Calaveras-Tuolumne-Southern Alpine Counties Above 5000 ft

22. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Sequoia NP

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

24. Winter Weather Advisory for: Mono

Want more detail? Get the Complete 7 Day and Night Detailed Forecast!

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