Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley
3. Beach Hazards Statement for: San Diego County Coastal Areas; Orange County Coastal
4. Frost Advisory for: Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County
5. High Surf Advisory for: Catalina and Santa Barbara Islands
6. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
7. High Surf Advisory for: Ventura County Beaches; Malibu Coast; Los Angeles County Beaches
8. High Wind Warning for: Antelope Valley
9. High Wind Warning for: Interstate 5 Corridor
10. High Wind Warning for: Mojave Desert Slopes
11. High Wind Warning for: Western Antelope Valley Foothills
12. Wind Advisory for: Antelope Valley
13. Wind Advisory for: Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin
14. Wind Advisory for: Eastern San Gabriel Mountains
15. Wind Advisory for: Eastern Sierra Slopes of Inyo County; Owens Valley
16. Wind Advisory for: Imperial County Southwest
17. Wind Advisory for: Joshua Tree NP West; Salton Sea; Imperial County Southeast; Imperial County West; Imperial Valley
18. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
19. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
20. Wind Advisory for: San Gorgonio Pass Near Banning
21. Wind Advisory for: San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley
22. Wind Advisory for: Santa Barbara County Interior Mountains
23. Wind Advisory for: Santa Barbara County Southeastern Coast; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches; Palos Verdes Hills; Los Angeles County Inland Coast including Downtown Los Angeles
24. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
25. Wind Advisory for: Santa Clarita Valley; Santa Susana Mountains
26. Wind Advisory for: Santa Ynez Mountains Eastern Range
27. Wind Advisory for: South End of the Upper Sierra; Piute Walker Basin; Tehachapi; Indian Wells Valley; Mojave Desert
28. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains
29. Wind Advisory for: Western Mojave Desert
30. Wind Advisory for: Western San Gabriel Mountains and Highway 14 Corridor
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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
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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 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