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: Coastal Del Norte; Del Norte Interior
12. Wind Advisory for: Indian Wells Valley; Mojave Desert
13. Wind Advisory for: Modoc County
14. 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
15. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
16. Wind Advisory for: Santa Susana Mountains
17. Wind Advisory for: Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains
18. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor
19. Wind Advisory for: Surprise Valley California; Northern Washoe County
20. Wind Advisory for: Western Antelope Valley Foothills; Antelope Valley
21. Wind Advisory for: Western Mojave Desert
22. Winter Weather Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area
23. Winter Weather Advisory for: Modoc County
24. Winter Weather Advisory for: Northern Trinity
25. Winter Weather Advisory for: West Slope Northern Sierra Nevada
26. Winter Weather Advisory for: Western Siskiyou County
27. 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--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 Snow?
Home - Education - Precipitation - Snow
Next Topic: Stratocumulus Clouds
Snow is precipitation taking the form of ice crystals. Each ice crystal, or snowflake,
has unique characteristics, but all of them grow in a hexagonal structure.
Snowfall can last for sustained periods of time and result in significant buildup
of snow on the ground.
On the earth's surface, snow starts out light and powdery, but as it begins to melt
it tends to become more granular, producing small bits of ice which have the consistency of
sand. After several cycles of melting and freezing, snow can become very dense
and ice-like, commonly known as snow pack.
Next Topic: Stratocumulus Clouds
Weather Topic: What are Stratus Clouds?
Home - Education - Cloud Types - Stratus Clouds
Next Topic: Wall Clouds
Stratus clouds are similar to altostratus clouds, but form at a
lower altitude and are identified by their fog-like appearance, lacking the
distinguishing features of most clouds.
Stratus clouds are wider than most clouds, and their base has a smooth, uniform
look which is lighter in color than a nimbostratus cloud.
The presence of a stratus cloud indicates the possibility of minor precipitation,
such as drizzle, but heavier precipitation does not typically arrive in the form
of a stratus cloud.
Next Topic: Wall Clouds
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