Weather Alerts for California
1. Air Quality Alert for: Coachella Valley
2. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley
3. Beach Hazards Statement for: Southern Monterey Bay and Big Sur Coast
4. Frost Advisory for: Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County
5. High Surf Advisory for: San Diego County Coastal Areas
6. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
7. High Surf Advisory for: Ventura County Beaches
8. Wind Advisory for: Imperial County Southwest
9. Wind Advisory for: Imperial County West; Imperial Valley
10. Wind Advisory for: Indian Wells Valley; Mojave Desert
11. Wind Advisory for: Mojave Desert Slopes
12. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta
13. Wind Advisory for: San Diego County Deserts; San Gorgonio Pass Near Banning
14. Wind Advisory for: San Francisco; Marin Coastal Range; Coastal North Bay Including Point Reyes National Seashore; San Francisco Peninsula Coast; Northern Salinas Valley/Hollister Valley and Carmel Valley; Southern Monterey Bay and Big Sur Coast
15. Wind Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast
16. Wind Advisory for: San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; Santa Ynez Valley
17. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
18. Wind Advisory for: Western Mojave Desert
19. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County
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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 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
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