Weather Alerts for California
1. Freeze Warning for: Western Siskiyou County; Central Siskiyou County; Eastern Curry County and Josephine County; Jackson County
2. High Wind Warning for: Mojave Desert Slopes
3. Wind Advisory for: Antelope Valley
4. Wind Advisory for: Interstate 5 Corridor
5. Wind Advisory for: Mojave Desert Slopes
6. Wind Advisory for: North Bay Interior Mountains; North Bay Interior Valleys
7. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Mountains Southwestern Shasta County to Western Colusa County
8. Wind Advisory for: Northern Ventura County Mountains
9. Wind Advisory for: Santa Barbara County Southeastern Coast; Santa Ynez Mountains Eastern Range
10. Wind Advisory for: Santa Barbara County Southwestern Coast; Santa Ynez Mountains Western Range
11. Wind Advisory for: Santa Clarita Valley; Santa Barbara County Interior Mountains; Southern Ventura County Mountains
12. Wind Advisory for: Western Antelope Valley Foothills
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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