Weather Alerts for California

Recent Locations: San Diego, CA

1. Extreme Heat Warning for: Del Norte Interior; Northern Humboldt Interior

2. Extreme Heat Warning for: Northern Trinity; Southern Trinity

3. Extreme Heat Warning for: Western Siskiyou County; Central Siskiyou County; Eastern Curry County and Josephine County; Jackson County

4. Heat Advisory for: Lassen-Eastern Plumas-Eastern Sierra Counties

5. Heat Advisory for: Northeastern Mendocino Interior; Northern Lake County; Southern Lake County

6. Heat Advisory for: Northwestern Mendocino Interior; Southeastern Mendocino Interior

7. Heat Advisory for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Northern Sacramento Valley; Central Sacramento Valley; Mountains Southwestern Shasta County to Western Colusa County; Northeast Foothills/Sacramento Valley; Western Plumas County/Lassen Park

8. Heat Advisory for: South Central Siskiyou County; North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Modoc County; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

9. Heat Advisory for: Southern Humboldt Interior

10. Heat Advisory for: Surprise Valley California; Mineral and Southern Lyon Counties; Greater Reno-Carson City-Minden Area; Western Nevada Basin and Range including Pyramid Lake; Northern Washoe County

11. Heat Advisory for: West Side Mountains north of 198; Los Banos - Dos Palos; Merced - Madera - Mendota; Planada - Le Grand - Snelling; Coalinga - Avenal; West Side of Fresno and Kings Counties; Caruthers - San Joaquin - Selma; Fresno-Clovis; West Side Mountains South of 198; Buttonwillow - Lost Hills - I5; Delano-Wasco-Shafter; Hanford - Corcoran - Lemoore; Visalia - Porterville - Reedley; Buena Vista; Bakersfield; Southeast San Joaquin Valley; South End San Joaquin Valley; Mariposa Madera Foothills; Mariposa-Madera Lower Sierra; Fresno-Tulare Foothills; Fresno-Tulare Lower Sierra; South End Sierra Foothills; South End of the Lower Sierra; Yosemite Valley; San Joaquin River Canyon; Kern River Valley

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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

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 is Snow?

Home - Education - Precipitation - Snow

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