Weather Alerts for California

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 is Precipitation?

Home - Education - Precipitation - 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

Weather Topic: What are Shelf Clouds?

Home - Education - Cloud Types - Shelf Clouds

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