Weather Alerts for California
1. Air Quality Alert for: Coachella Valley; San Gorgonio Pass Near Banning
2. Air Quality Alert for: Imperial County Southwest; Imperial County West; Imperial Valley
3. Beach Hazards Statement for: San Diego County Coastal Areas; Orange County Coastal
4. High Wind Warning for: Interstate 5 Corridor
5. High Wind Warning for: Mojave Desert Slopes
6. High Wind Warning for: Western Antelope Valley Foothills
7. High Wind Watch for: Antelope Valley
8. High Wind Watch for: Southern Ventura County Mountains; Northern Ventura County Mountains
9. Wind Advisory for: Antelope Valley
10. Wind Advisory for: Eastern San Gabriel Mountains
11. Wind Advisory for: Imperial County Southwest
12. Wind Advisory for: Joshua Tree NP West; Salton Sea; Imperial County Southeast; Imperial County West; Imperial Valley
13. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
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 Interior Mountains
17. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
18. Wind Advisory for: South End of the Upper Sierra; Piute Walker Basin; Tehachapi; Indian Wells Valley; Mojave Desert
19. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains
20. Wind Advisory for: Western Mojave Desert
21. Wind Advisory for: Western San Gabriel Mountains and Highway 14 Corridor
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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 Hail?
Home - Education - Precipitation - Hail
Next Topic: Hole Punch Clouds
Hail is a form of precipitation which is recognized by large solid balls or
clumps of ice. Hail is created by thunderstorm clouds with strong updrafts of wind.
As the hailstones remain in the updraft, ice is deposited onto them until their
weight becomes heavy enough for them to fall to the earth's surface.
Hail storms can cause significant damage to crops, aircrafts, and man-made structures,
despite the fact that the duration is usually less than ten minutes.
Next Topic: Hole Punch Clouds
Weather Topic: What are Mammatus Clouds?
Home - Education - Cloud Types - Mammatus Clouds
Next Topic: Nimbostratus Clouds
A mammatus cloud is a cloud with a unique feature which resembles
a web of pouches hanging along the base of the cloud.
In the United States, mammatus clouds tend to form in the warmer months, commonly
in the Midwest and eastern regions.
While they usually form at the bottom of a cumulonimbis cloud, they can also form
under altostratus, altocumulus, stratocumulus, and cirrus clouds. Mammatus clouds
warn that severe weather is close.
Next Topic: Nimbostratus Clouds