Weather Alert in California
Beach Hazards Statement issued August 11 at 9:07PM PDT until August 12 at 9:00PM PDT by NWS San Francisco CA
AREAS AFFECTED: Coastal North Bay Including Point Reyes National Seashore; Northern Monterey Bay
DESCRIPTION: * WHAT...A long period southwesterly swell will result in an increased risk for sneaker waves and rip currents.. * WHERE...Coastal North Bay Including Point Reyes National Seashore and Northern Monterey Bay Counties. * WHEN...Through Tuesday evening. * IMPACTS...Sneaker waves can unexpectedly run significantly farther up the beach than normal, including over rocks and jetties. Rip current conditions are present. Rip currents are typically more frequent and stronger in the vicinity of jetties, inlets, and piers. Swimmers should always swim near a lifeguard. * ADDITIONAL DETAILS...Greatest risk will be along southwest facing beaches. Coastal sections of Marin and Santa Cruz counties. In particular southwest facing beaches, including but not limited to Stinson Beach, Santa Cruz Boardwalk Beach, and Twin Lakes Beach.
INSTRUCTION: Remain out of the water to avoid hazardous swimming conditions.
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Weather Topic: What is Precipitation?
Home - Education - 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
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
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