Weather Alerts for California

Recent Locations: Dunnigan, CA

1. Avalanche Watch for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

2. Coastal Flood Advisory for: Northern Humboldt Coast

3. Flood Watch for: Coastal Del Norte; Del Norte Interior; Northern Humboldt Coast; Southwestern Humboldt; Northern Humboldt Interior; Southern Humboldt Interior; Northern Trinity; Southern Trinity; Mendocino Coast; Northwestern Mendocino Interior; Northeastern Mendocino Interior

4. Flood Watch for: Southwestern Mendocino Interior; Southeastern Mendocino Interior; Northern Lake County; Southern Lake County

5. Flood Watch for: Western Siskiyou County; Central Siskiyou County; South Central Oregon Coast; Curry County Coast; Central Douglas County; Eastern Curry County and Josephine County; Jackson County

6. High Surf Advisory for: San Luis Obispo County Beaches; Santa Barbara County Central Coast Beaches

7. Hydrologic Outlook for: Siskiyou, CA; Coos, OR; Curry, OR; Douglas, OR; Jackson, OR; Josephine, OR

8. Lake Wind Advisory for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

9. Wind Advisory for: Central Siskiyou County

10. Wind Advisory for: Coastal Del Norte; Northern Humboldt Interior

11. Wind Advisory for: Del Norte Interior

12. Wind Advisory for: Modoc County; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

13. Wind Advisory for: Southwestern Humboldt; Southern Humboldt Interior

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Current U.S. National Radar--Current

The Current National Weather Radar is shown below with a UTC Time (subtract 5 hours from UTC to get Eastern Time).

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 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