Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Air Quality Alert for: Imperial Valley
3. Beach Hazards Statement for: Catalina and Santa Barbara Islands; Malibu Coast; Los Angeles County Beaches
4. Beach Hazards Statement for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
5. Excessive Heat Warning for: Coachella Valley; San Diego County Deserts
6. Excessive Heat Warning for: Imperial County Southwest; Salton Sea; Imperial County West; Imperial Valley; Chuckwalla Valley
7. Excessive Heat Warning for: San Gorgonio Pass Near Banning
8. Fire Weather Watch for: Lake County Portion of Lake-Napa-Sonoma Unit
9. Heat Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire
10. Heat Advisory for: Santa Barbara County Southeastern Coast; Santa Ynez Mountains Eastern Range
11. Heat Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
12. High Surf Advisory for: Ventura County Beaches
13. High Wind Warning for: Interstate 5 Corridor; Western Antelope Valley Foothills
14. High Wind Warning for: Mojave Desert Slopes
15. High Wind Warning for: Northern Ventura County Mountains
16. High Wind Warning for: Santa Barbara County Interior Mountains
17. High Wind Warning for: Santa Barbara County Southeastern Coast; Santa Ynez Mountains Eastern Range
18. High Wind Warning for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
19. High Wind Watch for: Mojave Desert Slopes
20. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
21. Lake Wind Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties
22. Red Flag Warning for: Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft; Central Sacramento Valley including Glenn/Colusa/Yuba/Northern Sutter/Butte County Below 1000 Ft; Southern Sacramento Valley In Yolo/Sacramento/Far Western Placer/Southern Sutter and Solano County Below 1000 Ft - Excludes the Delta; Southeast Edge Shasta/Trinity NF and Western Portions of Tehama/Glenn RU; Northern Sierra Foothills from 1000 to 3000 Ft. Includes Nevada-Yuba-Placer RU and Anador-Eldorado RU; Eastern Mendocino NF
23. Wind Advisory for: Interstate 5 Corridor; Western Antelope Valley Foothills
24. Wind Advisory for: Northern Ventura County Mountains
25. Wind Advisory for: Santa Barbara County Interior Mountains
26. Wind Advisory for: Santa Barbara County Southeastern Coast; Santa Ynez Mountains Eastern Range
27. Wind Advisory for: Santa Clarita Valley
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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
