Weather Alerts for California
1. Avalanche Warning for: Eastern Sierra Slopes of Inyo County
2. Avalanche Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
3. Avalanche Warning for: Mono
4. Flood Warning for: Butte, CA; Glenn, CA
5. Flood Warning for: Mendocino, CA
6. Flood Warning for: Solano, CA; Yolo, CA
7. Flood Warning for: Sonoma, CA
8. Flood Warning for: Tehama, CA
9. Flood Watch for: Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; South End of the Lower Sierra; Kern River Valley; Piute Walker Basin
10. Flood Watch for: San Joaquin River Canyon
11. Flood Watch for: Shasta Lake Area / Northern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
12. Flood Watch for: Yosemite Valley
13. Frost Advisory for: North Bay Interior Valleys; Eastern Santa Clara Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
14. High Surf Advisory for: Coastal Del Norte; Northern Humboldt Coast; Southwestern Humboldt; Mendocino Coast
15. High Surf Advisory for: Malibu Coast; Los Angeles County Beaches
16. High Surf Advisory for: Orange County Coastal
17. High Surf Advisory for: San Diego County Coastal Areas
18. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
19. High Surf Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast
20. High Surf Advisory for: Ventura County Beaches
21. High Surf Warning 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
22. High Wind Warning for: San Bernardino County Mountains
23. Wind Advisory for: Apple and Lucerne Valleys
24. Wind Advisory for: Imperial County Southwest
25. Wind Advisory for: North Bay Interior Mountains; San Francisco Bay Shoreline; East Bay Interior Valleys; Santa Clara Valley Including San Jose; East Bay Hills; Northern Salinas Valley/Hollister Valley and Carmel Valley
26. Wind Advisory for: North Bay Interior Valleys; Eastern Santa Clara Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park
27. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Northern San Joaquin Valley
28. Wind Advisory for: Riverside County Mountains; San Diego County Mountains
29. Wind Advisory for: San Diego County Deserts
30. Wind Advisory for: San Francisco; Marin Coastal Range; Sonoma Coastal Range; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Santa Cruz Mountains; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast
31. Wind Advisory for: San Gorgonio Pass Near Banning
32. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
33. Wind Advisory for: Southern Lake County
34. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
35. Wind Advisory for: Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
36. Wind Advisory for: Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin
37. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
38. Winter Storm Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties
39. Winter Storm Warning for: Mono
40. Winter Storm Warning for: Northern Trinity; Southern Trinity
41. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Mountains Southwestern Shasta County to Western Colusa County
42. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
43. Winter Storm Warning for: Western Siskiyou County; South Central Siskiyou County; North Central and Southeast Siskiyou County
44. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra
45. Winter Weather Advisory for: San Bernardino County Mountains
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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 Altostratus Clouds?
Home - Education - Cloud Types - Altostratus Clouds
Next Topic: Cirrocumulus Clouds
Altostratus clouds form at mid to high-level altitudes
(between 2 and 7 km) and are created by a warm, stable air mass which causes
water vapor
to condense as it rise through the atmosphere. Usually altostratus clouds are
featureless sheets characterized by a uniform color.
In some cases, wind punching through the cloud formation may give it a waved
appearance, called altostratus undulatus. Altostratus clouds
are commonly seen with other cloud formations accompanying them.
Next Topic: Cirrocumulus Clouds
Weather Topic: What are Cirrostratus Clouds?
Home - Education - Cloud Types - Cirrostratus Clouds
Next Topic: Cirrus Clouds
Cirrostratus clouds are high, thin clouds that form above
20,000 feet and are made mostly of ice crystals. They sometimes look like giant
feathers, horse tails, or curls of hair in the sky.
These clouds are pushed by the jet stream and can move at high speeds reaching
100 mph.
What do they indicate?
They indicate that a precipitation is likely within 24 hours.
Next Topic: Cirrus Clouds