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. Air Quality Alert for: Los Angeles County San Gabriel Valley
4. Freeze Watch for: Western Siskiyou County
5. High Wind Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties
6. High Wind Warning for: Mojave Desert Slopes
7. High Wind Warning for: Mono
8. High Wind Watch for: Santa Susana Mountains
9. High Wind Watch for: Western Santa Monica Mountains Recreational Area; Western San Gabriel Mountains and Highway 14 Corridor
10. Wind Advisory for: Central Siskiyou County
11. Wind Advisory for: Indian Wells Valley; Mojave Desert
12. Wind Advisory for: Modoc County
13. Wind Advisory for: San Bernardino County Mountains; Riverside County Mountains; San Diego County Mountains; Apple and Lucerne Valleys; Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
14. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
15. Wind Advisory for: Santa Susana Mountains
16. Wind Advisory for: Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains
17. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
18. Wind Advisory for: Surprise Valley California; Northern Washoe County
19. Wind Advisory for: Western Antelope Valley Foothills; Antelope Valley
20. Wind Advisory for: Western Mojave Desert
21. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
22. Winter Weather Advisory for: Modoc County
23. Winter Weather Advisory for: Northern Trinity
24. Winter Weather Advisory for: West Slope Northern Sierra Nevada
25. Winter Weather Advisory for: Western Siskiyou County
26. Winter Weather Advisory for: Yosemite NP outside of the valley; Upper San Joaquin River
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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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