Weather Alert in California
Coastal Flood Advisory issued July 21 at 9:52AM PDT until July 22 at 12:00AM PDT by NWS San Francisco CA
AREAS AFFECTED: San Francisco; North Bay Interior Valleys; San Francisco Bay Shoreline
DESCRIPTION: * WHAT...Minor coastal flooding expected. * WHERE...San Francisco, North Bay Interior Valleys and San Francisco Bay Shoreline Counties. * WHEN...From 7 PM this evening to midnight PDT tonight. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Up to one foot inundation above ground level is possible in low lying areas near shorelines and tidal waterways. At the San Francisco tidal gauge high tide is expected to be 1.04 feet above normal (6.88 ft MLLW) at 9:02 PM PDT Monday. High tide timing varies up to 2 hours earlier or later along the coast and throughout the Bay.
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
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
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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