Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Freeze Warning for: Western Siskiyou County; Central Siskiyou County
3. High Wind Warning for: Eastern Sierra Slopes of Inyo County; Owens Valley; White Mountains of Inyo County; Death Valley National Park; Esmeralda and Central Nye County; Western Clark and Southern Nye County
4. High Wind Warning for: Mojave Desert Slopes
5. Wind Advisory for: Catalina and Santa Barbara Islands; San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches
6. Wind Advisory for: Imperial County Southwest
7. Wind Advisory for: Indian Wells Valley; Mojave Desert
8. Wind Advisory for: Joshua Tree NP West
9. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Northeast Foothills/Sacramento Valley
10. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
11. Wind Advisory for: Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley
12. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
13. Wind Advisory for: San Gorgonio Pass Near Banning
14. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
15. Wind Advisory for: Surprise Valley California; Northern Washoe County
16. Wind Advisory for: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
17. Winter Storm Warning for: Greater Lake Tahoe Area; Mono; Greater Lake Tahoe Area
18. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
19. 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
20. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
21. Winter Weather Advisory for: Western Siskiyou County
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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 Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
Weather Topic: What is Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds