Weather Alert in California

Recent Locations: Plumsteadville, PA   San Marcos, CA   Roscoe, NY  
Current Alerts for San Marcos, CA: High Surf Advisory Wind Advisory
Winter Weather Advisory

Flood Watch issued February 17 at 2:42AM PST until February 18 at 3:00AM PST by NWS Los Angeles/Oxnard CA

AREAS AFFECTED: Cuyama Valley; San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Santa Lucia Mountains; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast; Santa Ynez Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Santa Barbara County Interior Mountains

DESCRIPTION: * WHAT...Flooding caused by excessive rainfall is possible. Rock and mud slides are possible near steep terrain and along canyon roads. Debris flows are possible on recent burn scars. * WHERE...A portion of southwest California, including the following counties, San Luis Obispo and Santa Barbara Counties. * WHEN...From this afternoon through late tonight. * IMPACTS...Flash flooding is possible. Excessive runoff may result in flooding of low-lying and flood-prone locations, including creeks and streams. Flooding may occur in poor drainage and urban areas. Low-water crossings may be flooded. Extensive street flooding is possible. * ADDITIONAL DETAILS... - A line of heavy showers and thunderstorms will sweep across the region this afternoon into evening, bringing the risk for flash flooding, rock and mud slides, and burn-scar debris flows across the Flood Watch area. After the passage of the line, scattered heavy showers and thunderstorms will continue into late tonight, prolonging the flooding risk in isolated locations. Flooding and burn-scar debris flows are not expected for areas above the snow level, of approximately 4500 feet elevation, where snow will fall instead of rain. - http://www.weather.gov/safety/flood

INSTRUCTION: You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding and near recent burn scars should be prepared to take action should flooding develop. Travel through passes and canyons could become dangerous, and be alert for rock slides and mud slides. Follow the direction of Emergency Management and Law Enforcement officials.

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Weather Topic: What are Cirrocumulus Clouds?

Home - Education - Cloud Types - Cirrocumulus Clouds

Cirrocumulus Clouds Next Topic: Cirrostratus Clouds

Cirrocumulus clouds form at high altitudes (usually around 5 km) and have distinguishing characteristics displayed in a fine layer of small cloud patches. These small cloud patches are sometimes referred to as "cloudlets" in relation to the whole cloud formation.

Cirrocumulus clouds are formed from ice crystals and water droplets. Often, the water droplets in the cloud freeze into ice crystals and the cloud becomes a cirrostratus cloud. Because of this common occurrence, cirrocumulus cloud formations generally pass rapidly.

Next Topic: Cirrostratus Clouds

Weather Topic: What are Cirrus Clouds?

Home - Education - Cloud Types - Cirrus Clouds

Cirrus Clouds Next Topic: Condensation

Cirrus clouds are high-level clouds that occur above 20,000 feet and are composed mainly of ice crystals. They are thin and wispy in appearance.

What do they indicate?
They are often the first sign of an approaching storm.

Next Topic: Condensation

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