Weather Alert in California

Recent Locations: Acampo, CA  

Coastal Flood Advisory issued June 22 at 11:54PM PDT until June 24 at 1:00AM PDT by NWS San Francisco CA

AREAS AFFECTED: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline

DESCRIPTION: * WHAT...Minor coastal flooding expected during nocturnal high tide. * WHERE...Bayshore locations along the San Francisco Bay and San Pablo Bay. * WHEN...From 8 PM Monday to 1 AM PDT Tuesday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Low lying areas within the San Francisco Bay Area may see minor coastal flooding as a result during nocturnal high tide. San Francisco high tide is 7.03 ft at 10:08 PM Monday.

INSTRUCTION: If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property.

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Weather Topic: What is Graupel?

Home - Education - Precipitation - Graupel

Graupel Next Topic: Hail

Graupel is a form of precipitation that is created by atmospheric conditions which cause supercooled water droplets to contact snow crystals and freeze to their surface.

Sometimes known as soft hail or snow pellets, graupel is delicate and easily destroyed by touch. Whereas hail usually falls during severe weather, graupel doesn't require such conditions to form, and can form in mild precipitation similar to situations which produce snowfall.

Next Topic: Hail

Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

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