Weather Alerts for California
1. Flood Watch for: Cuyama Valley; Santa Clarita Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Ventura County Beaches; Ventura County Inland Coast; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; 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; Los Angeles County San Gabriel Valley
2. Flood Watch for: San Diego County Coastal Areas; San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Coastal; Orange County Inland
3. Flood Watch for: San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; 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
4. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
5. High Wind Watch for: Santa Lucia Mountains; San Luis Obispo County Mountains
6. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area; Western Nevada Basin and Range including Pyramid Lake
7. Wind Advisory for: Apple and Lucerne Valleys; Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
8. Wind Advisory for: Death Valley National Park; Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Western Clark and Southern Nye County; Spring Mountains-Red Rock Canyon; Las Vegas Valley; Southern Clark County
9. Wind Advisory for: Eastern Sierra Slopes of Inyo County; Owens Valley
10. Wind Advisory for: Imperial County Southwest
11. Wind Advisory for: Indian Wells Valley; Mojave Desert Slopes; Mojave Desert
12. Wind Advisory for: Morongo Basin; Cadiz Basin
13. Wind Advisory for: Salton Sea; Imperial County West; Imperial Valley
14. Wind Advisory for: Salton Sea; Imperial County West; Imperial Valley
15. Wind Advisory for: San Francisco Peninsula Coast; Santa Cruz Mountains; East Bay Hills; Northern Monterey Bay
16. Wind Advisory for: San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast
17. Wind Advisory for: Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; Southern Monterey Bay and Big Sur Coast
18. Wind Advisory for: Southern Salinas Valley; San Luis Obispo County Interior Valleys
19. Wind Advisory for: West Side Mountains north of 198; West Side Mountains South of 198; Buena Vista
20. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
21. Winter Storm Warning for: Mono
22. Winter Storm Warning for: Shasta Lake Area / Northern Shasta County; Mountains Southwestern Shasta County to Western Colusa County
23. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
24. 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
25. Winter Storm Watch for: Piute Walker Basin; Tehachapi; Frazier Mountain Communities
26. Winter Storm Watch for: San Bernardino County Mountains; Riverside County Mountains
27. Winter Storm Watch for: San Diego County Mountains
28. Winter Storm Watch for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
29. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
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Current U.S. National Radar--Current
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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 Cirrus Clouds?
Home - Education - Cloud Types - Cirrus Clouds
Next Topic: Condensation
Cirrus clouds are high-level clouds that occur above 20,000 feet
and are composed mainly of ice crystals.
They are thin and wispy in appearance.
What do they indicate?
They are often the first sign of an approaching storm.
Next Topic: Condensation
Weather Topic: What are Contrails?
Home - Education - Cloud Types - Contrails
Next Topic: Cumulonimbus Clouds
A contrail is an artificial cloud, created by the passing of an
aircraft.
Contrails form because water vapor in the exhaust of aircraft engines is suspended
in the air under certain temperatures and humidity conditions. These contrails
are called exhaust contrails.
Another type of contrail can form due to a temporary reduction in air pressure
moving over the plane's surface, causing condensation.
These are called aerodynamic contrails.
When you can see your breath on a cold day, it is also because of condensation.
The reason contrails last longer than the condensation from your breath is
because the water in contrails freezes into ice particles.
Next Topic: Cumulonimbus Clouds