Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Freeze Warning for: Western Siskiyou County; Central Siskiyou County
3. High Wind Warning for: Eastern Sierra Slopes of Inyo County; Owens Valley; White Mountains of Inyo County; Death Valley National Park; Esmeralda and Central Nye County; Western Clark and Southern Nye County
4. High Wind Warning for: Mojave Desert Slopes
5. Special Weather Statement for: Burney Basin / Eastern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park
6. Special Weather Statement for: San Francisco; San Francisco Bay Shoreline; San Francisco Peninsula Coast; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills
7. Wind Advisory for: Catalina and Santa Barbara Islands; San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; Ventura County Beaches; Ventura County Inland Coast; Malibu Coast; Los Angeles County Beaches
8. Wind Advisory for: Imperial County Southwest
9. Wind Advisory for: Indian Wells Valley; Mojave Desert
10. Wind Advisory for: Joshua Tree NP West
11. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Northeast Foothills/Sacramento Valley
12. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
13. Wind Advisory for: Salton Sea; Chuckwalla Mountains; Imperial County Southeast; Imperial County West; Imperial Valley
14. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
15. Wind Advisory for: San Gorgonio Pass Near Banning
16. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
17. Wind Advisory for: Surprise Valley California; Northern Washoe County
18. Wind Advisory for: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley
19. Winter Storm Warning for: Greater Lake Tahoe Area; Mono; Greater Lake Tahoe Area
20. Winter Storm Warning for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
21. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP
22. Winter Weather Advisory for: Del Norte Interior; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Northeastern Mendocino Interior
23. Winter Weather Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
24. Winter Weather Advisory for: Western Siskiyou County
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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 are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
