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California, Northern Salinas Valley/Hollister Valley and Carmel Valley

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:

Local river forecast center:


NWS mobile:

California flood preparedness:


Map service center:

US Army corps of engineers:

Weather Severe Map
Arizona - Record Report , Public Information Statement
Arkansas - Flood Warning , Dense Fog Advisory
California - High Surf Advisory , Beach Hazard Statement , Record Report , Public Information Statement
Colorado - Dense Fog Advisory , Public Information Statement
Connecticut - Public Information Statement
Idaho - Wind Advisory , Winter Weather Advisory , Record Report
Indiana - Public Information Statement
Kansas - Dense Fog Advisory , Public Information Statement
Kentucky - Public Information Statement
Massachusetts - Public Information Statement
Minnesota - Public Information Statement
Missouri - Public Information Statement
Montana - Winter Weather Advisory , Record Report
Nebraska - Public Information Statement
Nevada - Record Report
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North Dakota - Record Report , Public Information Statement
Oklahoma - Dense Fog Advisory
Oregon - High Wind Warning , Special Statement , Record Report
South Carolina - Public Information Statement
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Tennessee - Public Information Statement
Texas - Record Report
Utah - Public Information Statement
Vermont - Public Information Statement
Virginia - Public Information Statement
Washington - Areal Flood Watch , High Wind Warning , Wind Advisory , Dense Fog Advisory , Special Statement , Record Report
Wisconsin - Public Information Statement
Wyoming - Record Report