Weather Alerts for California
1. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire
2. Frost Advisory for: Northwestern Mendocino Interior; Northeastern Mendocino Interior
3. High Wind Warning for: Santa Susana Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
4. High Wind Watch for: Piute Walker Basin; Tehachapi; Indian Wells Valley; Mojave Desert Slopes; Mojave Desert
5. High Wind Watch for: San Bernardino and Riverside County Valleys-The Inland Empire; San Bernardino County Mountains
6. Wind Advisory for: Eastern Santa Monica Mountains Recreational Area; Interstate 5 Corridor
7. Wind Advisory for: Eastern Sierra Slopes of Inyo County
8. Wind Advisory for: Owens Valley; White Mountains of Inyo County; Death Valley National Park; Morongo Basin; Lincoln County; Western Clark and Southern Nye County
9. Wind Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire; San Bernardino County Mountains
10. Wind Advisory for: Santa Ana Mountains and Foothills; Orange County Inland
11. Wind Advisory for: Santa Clarita Valley; Malibu Coast; Western Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Southern Ventura County Mountains; Northern Ventura County Mountains
12. Wind Advisory for: Santa Susana Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
13. Wind Advisory for: Santa Ynez Mountains Eastern Range; Lake Casitas
14. Wind Advisory for: Ventura County Beaches; Ventura County Inland Coast; Central Ventura County Valleys
15. Wind Advisory for: Western Mojave Desert
16. Wind Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River; Kings Canyon NP; Sequoia NP; South End of the Upper Sierra
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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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