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. High Surf Advisory for: Ventura County Beaches; Malibu Coast; Los Angeles County Beaches
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; Imperial County Southeast
13. Wind Advisory for: Riverside County Mountains; San Diego County Mountains; Coachella Valley; San Diego County Deserts
14. Wind Advisory for: Salton Sea; Imperial County West; Imperial Valley
15. Wind Advisory for: Salton Sea; Imperial County West; Imperial Valley
16. Wind Advisory for: San Bernardino County Mountains; Apple and Lucerne Valleys
17. Wind Advisory for: San Gorgonio Pass Near Banning
18. Wind Advisory for: Santa Barbara County Interior Mountains
19. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
20. Wind Advisory for: South End of the Upper Sierra; Piute Walker Basin; Tehachapi; Indian Wells Valley; Mojave Desert
21. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains
22. Wind Advisory for: Western Mojave Desert
23. 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
The Current National Weather Forecast and National Weather Map are shown below.
National Weather Forecast for Tomorrow
Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.
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 Shelf Clouds?
Home - Education - Cloud Types - Shelf Clouds
Next Topic: Sleet
A shelf cloud is similar to a wall cloud, but forms at the front
of a storm cloud, instead of at the rear, where wall clouds form.
A shelf cloud is caused by a series of events set into motion by the advancing
storm; first, cool air settles along the ground where precipitation has just fallen.
As the cool air is brought in, the warmer air is displaced, and rises above it,
because it is less dense. When the warmer air reaches the bottom of the storm cloud,
it begins to cool again, and the resulting condensation is a visible shelf cloud.
Next Topic: Sleet
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
