Weather Alerts for California
1. Air Quality Alert for: Eastern San Fernando Valley; Eastern Santa Monica Mountains Recreational Area; Los Angeles County Beaches; Los Angeles County Inland Coast including Downtown Los Angeles; Los Angeles County San Gabriel Valley; Malibu Coast; Palos Verdes Hills; Santa Clarita Valley; Santa Susana Mountains; Western San Fernando Valley; Western Santa Monica Mountains Recreational Area
2. Air Quality Alert for: San Bernardino and Riverside County Valleys-The Inland Empire; Santa Ana Mountains and Foothills; San Gorgonio Pass Near Banning; Orange County Coastal; Orange County Inland
3. Beach Hazards Statement for: Catalina and Santa Barbara Islands; Ventura County Beaches; Malibu Coast; Los Angeles County Beaches
4. Beach Hazards Statement for: San Diego County Coastal Areas; Orange County Coastal
5. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
6. Lake Wind Advisory for: Mono; Greater Reno-Carson City-Minden Area; Western Nevada Basin and Range including Pyramid Lake
7. Red Flag Warning for: Eastern Lassen County; Northern Sierra Front - Carson City/Douglas/Storey/Southern Washoe/Eastern Lyon/Far Southern Lassen Counties; Southern Sierra Front - Alpine/Northern Mono/Southern Lyon/Western Mineral Counties; West Humboldt Basin - Pershing County; Lahontan Basin - Churchill and Eastern Mineral Counties; Northern Washoe County
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Current U.S. National Radar--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
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