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California, East Bay Interior Valleys

Public Information Statement

Statement as of 7:16 AM PDT on October 21, 2014


... Public information statement...

October 20th through 24th is California flood preparedness week!
The National Weather Service forecast office for the San Francisco
and Monterey Bay areas will feature a different educational topic
each day during the preparedness week.

Today's topic: types of floods local to the California central coast

A flood is defined as any high flow, overflow, or inundation by
water which causes or threatens damage. This usually occurs with
prolonged rainfall over several days, intense rainfall over a
short period of time, or when a debris jam causes a river or
stream to overflow and flood the surrounding area. Other factors
that can cause or worsen flooding in our area include levee or dam
failure .

Flash flooding
a flash flood is defined as a rapid water level rise in a stream,
creek, or river above a predetermined flood level, or a rapid and
extreme flow of water into a normally dry area. Flash floods can
occur within hours in local streams, or in minutes on dry ground
prone to ponding, after heavy rainfall begins. Flash flooding is
the dominant type of flooding that occurs in the California
central coast, and indeed much of California-small creeks and
rivers typically respond quickly and rise rapidly during heavy
rainfall events. Flash floods may also occur in minutes after a
dam or levee fails, or following a sudden release of water held by
a debris jam. Flash floods can even occur in areas away from the
causative event. For example, an otherwise tranquil stream channel
can fill quickly from an upstream rainfall event. Flash floods can
catch people off guard and unprepared. You may only have a few
minutes warning that these deadly, sudden floods are coming. If
you live in areas prone to flash floods plan now to protect your
family and property.

Dam break or levee failure flooding
flooding due to failure of engineered structures, especially
during the dry season is rare, but can be catastrophic and
extremely dangerous. Information on dam failure or overtopping, or
levee failure or seepage, is closely monitored by the Weather
Service, and by federal, state, and local operators and emergency
managers. In the event of potential, imminent, or occurring
failure, the Weather Service works quickly to inform the public,
emergency personnel, and the media of such situations and the
threat they may pose. It is important to note that such failures
can occur in the dry season, especially because earthquakes can
happen year round. It is also important to know your risk, know
where local levees, dams, or other impoundment structures are
located relative to your community.

Join US tomorrow for information on debris flows and the hydrology
of land burned by wildfires.

&&

Important flood websites
local NWS office:
http://www.Weather.Gov/mtr

Local river forecast center:
http://www.Cnrfc.NOAA.Gov

Nws:
http://www.Weather.Gov/

NWS mobile:
http://Mobile.Weather.Gov

California flood preparedness:
http://www.Water.CA.Gov/floodsafe/CA-flood-preparedness/fpw_home.Cfm

Fema:
http://www.Fema.Gov/fema/

Map service center:
https://MSC.Fema.Gov

US Army corps of engineers:
http://www.Usace.Army.Mil/


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Washington - Areal Flood Watch , Wind Advisory , High Wind Warning , Special Statement , Record Report
West Virginia - Public Information Statement
Wyoming - Record Report
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