Weather Alert in California
Flood Advisory issued February 17 at 2:34PM PST until February 17 at 5:00PM PST by NWS San Francisco CA
AREAS AFFECTED: Alameda, CA; Contra Costa, CA; San Francisco, CA; San Mateo, CA; Santa Clara, CA; Santa Cruz, CA
DESCRIPTION: * WHAT...Flooding caused by excessive rainfall continues. * WHERE...Alameda County in northern California... Contra Costa County in northern California... San Francisco County in northern California... San Mateo County in northern California... Santa Clara County in northern California... Santa Cruz County in northern California... * Until 500 PM PST. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Overflowing poor drainage areas. Ponding of water in urban or other areas is occurring or is imminent. * ADDITIONAL DETAILS... - At 234 PM PST, Doppler radar and automated rain gauges indicated heavy rain due to thunderstorms. Overflowing poor drainage areas have already caused minor flooding in the advisory area. Between 0.5 and 2 inches of rain have fallen. - Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... San Jose, San Francisco, Oakland, Fremont, Hayward, Sunnyvale, Concord, Santa Clara, Berkeley, Richmond, Antioch, Daly City, San Mateo, San Leandro, Livermore, Redwood City, Mountain View, Alameda, San Ramon and Pleasanton. - http://www.weather.gov/safety/flood
INSTRUCTION: Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles.
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Weather Topic: What are Fractus Clouds?
Home - Education - Cloud Types - Fractus Clouds
Next Topic: Freezing Rain
A fractus cloud (scud) is a fragmented, tattered cloud which has
likely been sheared off of another cloud. They are accessory clouds, meaning they
develop from parent clouds, and are named in a way which describes the original
cloud which contained them.
Fractus clouds which have originated from cumulus clouds are referred to as
cumulus fractus, while fractus clouds which have originated from stratus clouds
are referred to as stratus fractus. Under certain conditions a fractus cloud might
merge with another cloud, or develop into a cumulus cloud, but usually a
fractus cloud seen by itself will dissipate rapidly.
They are often observed on the leading and trailing edges of storm clouds,
and are a display of wind activity.
Next Topic: Freezing Rain
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
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