Weather Alerts for California

Recent Locations: Montpelier, ID Wiggins, MS Rutherford, CA

1. Flood Watch for: Death Valley National Park; Western Mojave Desert; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin

2. Flood Watch for: Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area; Sequoia NP; South End of the Upper Sierra; Kern River Valley; Piute Walker Basin; Tehachapi; Indian Wells Valley; Mojave Desert Slopes; Mojave Desert

3. Flood Watch for: Mono; Mineral and Southern Lyon Counties

4. Flood Watch for: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills; Antelope Valley

5. Heat Advisory for: Cuyama Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains

6. Heat Advisory for: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Santa Ana Mountains and Foothills; Orange County Inland

7. Heat Advisory for: Santa Clarita Valley; Lake Casitas; Ojai Valley; Central Ventura County Valleys; Los Angeles County Inland Coast including Downtown Los Angeles; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Southeastern Ventura County Valleys; Santa Susana Mountains; Los Angeles County San Gabriel Valley

8. Heat Advisory for: Santa Ynez Mountains Eastern Range

9. Heat Advisory for: Southern Ventura County Mountains; Northern Ventura County Mountains; Interstate 5 Corridor; Western San Gabriel Mountains and Highway 14 Corridor

10. Heat Advisory for: Ventura County Inland Coast

11. Red Flag Warning for: Lower Middle Klamath; Trinity

12. Red Flag Warning for: Modoc County Except for the Surprise Valley; Umpqua National Forest; Southern Oregon Cascades; Klamath Basin and the Fremont-Winema National Forest; South Central Oregon Desert including the BLM Land in Eastern Lake and Western Harney Counties

13. Red Flag Warning for: Siskiyou County from the Cascade Mountains East and South to Mt Shasta

14. Red Flag Warning for: Surprise Valley California; Eastern Lassen County; Northern Washoe County

15. Red Flag Warning for: Western Klamath National Forest; Central Siskiyou County Including Shasta Valley; Siskiyou Mountains

16. Special Weather Statement for: Kaiser to Rodgers Ridge; Kings Canyon NP; Grant Grove Area

17. Special Weather Statement for: South End of the Lower Sierra; Kings Canyon NP; Grant Grove Area; Sequoia NP

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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 are Mammatus Clouds?

Home - Education - Cloud Types - Mammatus Clouds

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

Weather Topic: What is Precipitation?

Home - Education - Precipitation - Precipitation

Next Topic: Rain

Precipitation can refer to many different forms of water that may fall from clouds. Precipitation occurs after a cloud has become saturated to the point where its water particles are more dense than the air below the cloud.

In most cases, precipitation will reach the ground, but it is not uncommon for precipitation to evaporate before it reaches the earth's surface. When precipitation evaporates before it contacts the ground it is called Virga. Graupel, hail, sleet, rain, drizzle, and snow are forms of precipitation, but fog and mist are not considered precipitation because the water vapor which constitutes them isn't dense enough to fall to the ground.

Next Topic: Rain