Weather Alerts for California

Recent Locations: San Francisco, CA  

1. Red Flag Warning for: Central Sacramento Valley including Glenn, Colusa, Yuba, Northern Sutter, Butte County Below 1000 Ft; Eastern Delta; Eastern Mendocino NF; Eastern Portion of Shasta, Trinity NF; Northern Motherlode From 1000 to 3000 Ft. From Yuba To Amador Counties; Northern Sacramento Valley to Southern Tehama County Line Below 1000 Ft; Northern San Joaquin Valley in San Joaquin and Stanislaus Counties Below 1000 ft - Excludes the Delta; Northern Sierra Foothills from 1000 to 3000 Ft. Includes Nevada-Yuba-Placer RU and Anador-Eldorado RU; Southeast Edge Shasta, Trinity NF and Western Portions of Tehama, Glenn RU; Southern Motherlode From 1000 to 3000 Ft, Calaveras and Toulumne Counties; Southern Sacramento Valley In Yolo, Sacramento, Far Western Placer, Southern Sutter and Solano County Below 1000 Ft - Excludes the Delta

2. Red Flag Warning for: East Bay Hills and the Diablo Range; East Bay Interior Valleys; North Bay Mountains

3. Wind Advisory for: Indian Wells Valley; Kern County Desert; Tehachapi Area

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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).

Current U.S. National Radar

National Weather Forecast--Current

The Current National Weather Forecast and National Weather Map are shown below.

Today's National Weather Map

National Weather Forecast for Tomorrow

Tomorrow National Weather Forecast and Tomorrow National Weather Map are show below.

Tomorrows National Weather Map

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.

North American Water Vapor Map

Weather Topic: What are Wall Clouds?

Home - Education - Cloud Types - Wall Clouds

Wall Clouds Next Topic: Altocumulus Clouds

A wall cloud forms underneath the base of a cumulonimbus cloud, and can be a hotbed for deadly tornadoes.

Wall clouds are formed by air flowing into the cumulonimbus clouds, which can result in the wall cloud descending from the base of the cumulonimbus cloud, or rising fractus clouds which join to the base of the storm cloud as the wall cloud takes shape.

Wall clouds can be very large, and in the Northern Hemisphere they generally form at the southern edge of cumulonimbus clouds.

Next Topic: Altocumulus Clouds

Weather Topic: What are Altostratus Clouds?

Home - Education - Cloud Types - Altostratus Clouds

Altostratus Clouds Next Topic: Cirrocumulus Clouds

Altostratus clouds form at mid to high-level altitudes (between 2 and 7 km) and are created by a warm, stable air mass which causes water vapor to condense as it rise through the atmosphere. Usually altostratus clouds are featureless sheets characterized by a uniform color.

In some cases, wind punching through the cloud formation may give it a waved appearance, called altostratus undulatus. Altostratus clouds are commonly seen with other cloud formations accompanying them.

Next Topic: Cirrocumulus Clouds