Weather Alerts for California
1. Beach Hazards Statement for: San Diego County Coastal Areas; Orange County Coastal
2. Frost Advisory for: Northern Trinity; Southern Trinity; Northwestern Mendocino Interior; Northeastern Mendocino Interior; Northern Lake County
3. High Surf Advisory for: Catalina and Santa Barbara Islands; Ventura County Beaches; Malibu Coast; Los Angeles County Beaches
4. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches
5. High Wind Warning for: Antelope Valley
6. High Wind Warning for: Interstate 5 Corridor
7. High Wind Warning for: San Miguel and Santa Rosa Islands; Santa Cruz and Anacapa Islands
8. High Wind Warning for: Western Antelope Valley Foothills
9. Wind Advisory for: Catalina and Santa Barbara Islands
10. Wind Advisory for: Eastern San Gabriel Mountains
11. Wind Advisory for: Imperial County Southwest
12. Wind Advisory for: Lake Casitas
13. Wind Advisory for: Santa Barbara County Interior Mountains
14. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
15. Wind Advisory for: Santa Clarita Valley; Santa Susana Mountains
16. Wind Advisory for: Santa Ynez Mountains Eastern Range
17. Wind Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains
18. 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
