Weather Alerts for California

Recent Locations: Darien, WI Buckeye, IA Ben Lomond, CA

1. Cold Weather Advisory for: Mariposa-Madera Lower Sierra; Fresno-Tulare Lower Sierra; South End of the Lower Sierra; 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; South End of the Upper Sierra

2. Cold Weather Advisory for: North Bay Interior Mountains; North Bay Interior Valleys; East Bay Interior Valleys; Santa Clara Valley Including San Jose; East Bay Hills; Northern Salinas Valley/Hollister Valley and Carmel Valley

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

4. Cold Weather Advisory for: Yosemite Valley

5. Extreme Cold Warning for: 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

6. Freeze Warning for: Cuyama Valley; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills

7. Freeze Warning for: Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley

8. Frost Advisory for: Santa Barbara County Inland Central Coast; Santa Ynez Valley

9. Frost Advisory for: Santa Clarita Valley; Ojai Valley; Central Ventura County Valleys; Calabasas and Agoura Hills; Western San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains

10. High Wind Warning for: Coastal Del Norte

11. High Wind Warning for: Del Norte Interior; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior

12. Hydrologic Outlook for: Siskiyou, CA; Coos, OR; Curry, OR; Josephine, OR

13. Wind Advisory for: Central Siskiyou County

14. Wind Advisory for: Mendocino Coast; Northwestern Mendocino Interior; Southwestern Mendocino Interior

15. Wind Advisory for: Northern Humboldt Coast

16. Winter Storm Warning for: Northern Trinity

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

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

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 Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

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