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. High Wind Warning for: Mojave Desert Slopes
4. Wind Advisory for: Apple and Lucerne Valleys; San Diego County Deserts; San Gorgonio Pass Near Banning
5. Wind Advisory for: Death Valley National Park; Western Mojave Desert; Morongo Basin
6. Wind Advisory for: Imperial County Southwest
7. Wind Advisory for: Imperial County West
8. Wind Advisory for: Imperial Valley
9. Wind Advisory for: Indian Wells Valley; Mojave Desert
10. Winter Weather Advisory for: Eastern Sierra Slopes of Inyo County
11. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
12. Winter Weather Advisory for: Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains
13. Winter Weather Advisory for: Mono
14. Winter Weather Advisory for: San Bernardino County Mountains
15. Winter Weather Advisory for: Santa Barbara County Interior Mountains; Southern Ventura County Mountains; Northern Ventura County Mountains
16. Winter Weather Advisory for: South End of the Upper Sierra; Piute Walker Basin; Tehachapi; Grapevine; Frazier Mountain Communities
17. Winter Weather Advisory for: Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada
18. Winter Weather Advisory for: Yosemite NP outside of the valley; San Joaquin River Canyon; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP
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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 Cumulonimbus Clouds?
Home - Education - Cloud Types - Cumulonimbus Clouds
Next Topic: Cumulus Clouds
The final form taken by a growing cumulus cloud is the
cumulonimbus cloud, which is very tall and dense.
The tower of a cumulonimbus cloud can soar 23 km into the atmosphere, although
most commonly they stop growing at an altitude of 6 km.
Even small cumulonimbus clouds appear very large in comparison to other cloud types.
They can signal the approach of stormy weather, such as thunderstorms or blizzards.
Next Topic: Cumulus Clouds
Weather Topic: What is Drizzle?
Home - Education - Precipitation - Drizzle
Next Topic: Evaporation
Drizzle is precipitation in the form of water droplets which are
smaller than raindrops.
Drizzle is characterized by fine, gently falling droplets and typically does not
impact human habitation in a negative way. The exception to this is freezing drizzle,
a condition where drizzle freezes immediately upon reaching earth's surface.
Freezing drizzle is still less dangerous than freezing rain, but can
potentially result in hazardous road conditions.
Next Topic: Evaporation
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