Weather Alerts for California
Red Flag Warning Winter Storm Watch
1. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire; Santa Ana Mountains and Foothills; Orange County Inland
2. Air Quality Alert for: Santa Clarita Valley; Malibu Coast; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor
3. Air Quality Alert for: Ventura County Beaches; Ventura County Inland Coast; Central Ventura County Valleys; Southeastern Ventura County Valleys; Santa Susana Mountains
4. Cold Weather Advisory for: North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Modoc County; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
5. Freeze Warning for: Antelope Valley
6. Freeze Warning for: Ojai Valley
7. Freeze Warning for: Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast
8. Frost Advisory for: San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast
9. Frost Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast
10. Frost Advisory for: Southern Salinas Valley/Arroyo Seco and Lake San Antonio
11. High Wind Warning for: 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; San Gorgonio Pass Near Banning; Orange County Inland
12. Red Flag Warning for: San Bernardino and Riverside County Valleys - The Inland Empire; San Diego County Inland Valleys; San Bernardino County Mountains-Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest; Riverside County Mountains-Including The San Jacinto Ranger District Of The San Bernardino National Forest; Santa Ana Mountains-Including The Trabuco Ranger District of the Cleveland National Forest; San Diego County Mountains-Including The Palomar And Descanso Ranger Districts of the Cleveland National Forest; San Gorgonio Pass Near Banning; Orange County Inland
13. Red Flag Warning for: Santa Clarita Valley; Ventura County Beaches; Ventura County Inland Coast; Central Ventura County Valleys; Malibu Coast; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys
14. Red Flag Warning for: Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Santa Susana Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
15. Wind Advisory for: North Bay Interior Mountains
16. Wind Advisory for: North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Modoc County; South Central Oregon Cascades; Siskiyou Mountains and Southern Oregon Cascades
17. Wind Advisory for: Santa Clarita Valley
18. Wind Advisory for: Shasta Lake Area / Northern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
19. Wind Advisory for: Ventura County Beaches; Ventura County Inland Coast; Central Ventura County Valleys; Malibu Coast; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Southeastern Ventura County Valleys
20. Wind Advisory for: Western Siskiyou County; Central Siskiyou County; South Central Siskiyou County; Curry County Coast
21. Winter Storm Watch for: Riverside County Mountains
22. Winter Storm Watch for: San Bernardino County Mountains
23. Winter Storm Watch for: San Diego County Mountains
24. Winter Weather Advisory for: Mariposa-Madera Lower Sierra; Yosemite NP outside of the valley; Yosemite 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
25. Winter Weather Advisory for: Piute Walker Basin; Tehachapi; Grapevine; Frazier Mountain Communities
26. Winter Weather Advisory 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
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Current U.S. National Radar--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 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
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
