San Francisco, CA

72.0°F / 22.2°C
Mostly Cloudy
Heat Index: 74°F / 24°C
Humidity: 71%
Dew Point: 62°F / 17°C
Wind: North at 2.0 mph / 3.2 km/h
Wind Gust: 0.0 mph / 0.0 km/h
Pressure: 30.05 in / 1018 hPa (Falling)
Visibility: 10.0 miles / 16.1 kilometers
Clouds: (FEW) : 2000 ft / 609 m
Mostly Cloudy (BKN) : 18000 ft / 5486 m
Yesterday's Maximum: 74°F / 23°C
Yesterday's Minimum: 57°F / 14°C
UV: 3 out of 16
Sunrise:7:25 AM PDT
Sunset:6:21 PM PDT
Moon Rise:7:11 AM PDT
Moon Set:6:26 PM PDT
Moon Phase Waning Crescent
Marine Forecast & Tides
NOAA Weather Radio
METAR KSFO 231956Z 06005KT 10SM FEW020 BKN180 22/16 A3005 RMK AO2 SLP176 T02170161
As of: 1:34 PM PDT on October 23, 2014
Observed at: SOMA - Near Van Ness, San Francisco, CA

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Forecast

Today
partlycloudy
73° | 63°F
23° | 17°C
Friday
partlycloudy
75° | 61°F
24° | 16°C
Saturday
chancerain
72° | 57°F
22° | 14°C
Today is forecast to be
nearly the same temperature as yesterday.
Thursday
Partly cloudy with a chance of rain. High of 73F. Winds from the SSW at 5 to 10 mph shifting to the West in the afternoon. Chance of rain 20%.
Thursday Night
Partly cloudy. Low of 63F. Winds less than 5 mph.
Friday
Partly cloudy in the morning, then clear. High of 75F. Winds from the SSE at 5 to 10 mph.
Friday Night
Partly cloudy with a chance of rain after midnight. Low of 61F. Winds from the SSW at 5 to 15 mph.
Saturday
Partly cloudy with a chance of rain, then rain showers in the afternoon. High of 72F. Breezy. Winds from the South at 15 to 20 mph. Chance of rain 60%.
Saturday Night
Partly cloudy with a chance of rain in the evening, then overcast with a chance of rain. Low of 57F. Winds from the SSW at 5 to 20 mph shifting to the West after midnight. Chance of rain 50%.
Sunday
Partly cloudy in the morning, then clear. High of 66F. Winds from the NW at 10 to 15 mph.
Sunday Night
Clear in the evening, then overcast. Low of 55F. Winds from the NW at 10 to 15 mph.
Monday
Partly cloudy in the morning, then clear. High of 66F. Winds from the NW at 5 to 15 mph.
Monday Night
Clear. Low of 55F. Winds from the NW at 5 to 10 mph.
Tuesday
Clear. High of 68F. Winds from the WNW at 5 to 15 mph.
Tuesday Night
Clear. Low of 59F. Winds from the NW at 5 to 10 mph.
Wednesday
Mostly cloudy. High of 73F. Winds from the NW at 5 to 10 mph.
Wednesday Night
Partly cloudy. Low of 59F. Winds from the NW at 5 to 10 mph shifting to the NNE after midnight.
Thursday
Mostly cloudy. High of 77F. Winds from the North at 5 to 10 mph.
Thursday Night
Partly cloudy. Low of 57F. Winds from the NNE at 5 to 10 mph.
Friday
Clear. High of 77F. Winds less than 5 mph.
Friday Night
Clear. Low of 55F. Winds less than 5 mph.
Saturday
Partly cloudy. High of 66F. Winds less than 5 mph.
Saturday Night
Partly cloudy. Fog overnight. Low of 55F. Winds less than 5 mph.
Sunday
Clear. High of 66F. Winds less than 5 mph.
Sunday Night
Clear. Fog overnight. Low of 57F. Winds less than 5 mph.
Monday
Clear. High of 66F. Winds less than 5 mph.

As of: 2:00 PM PDT on October 23, 2014 from station KCASANFR231
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Scientific Forecaster Discussion

Warnings & Notices

Public Information Statement

Statement as of 8:00 am PDT on October 23, 2014

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: coastal flooding

Californias coastline is approximately 850 miles long, making it
one of the longest state coastlines in America (only Alaska's and
Florida's coastlines are longer). When tidal areas, estuaries,
and deltas are included, californias coastline grows to
approximately 3,425 miles.

When most people think about coastal hazards, it is most likely
that tides, waves, and rip currents come to mind or maybe even
tsunamis. While these are important coastal hazards to be aware
of, coastal flooding is typically a result of how rivers interact
with the estuaries and lagoons that they fill at the coast. As
such, coastal flooding is an ever-present hazard that can occur
year-round and can extend well inland. Rivers along the often
mountainous, terraced coastline of California may be entrenched in
canyons for much of their length, limiting flood threat during
winter storms to only roadways and structures in the valley floor.
But they often open into floodplains before entering the sea,
distributing flood threat across a more expansive area.
Floodplains in these coastal settings can be inundated with
variable frequency by riverine and estuarine waters. Particularly
important and common along the California coast are river mouths
that are controlled, in part, by beach-barrier bars that form
seasonally. Beach-barrier bars episodically and naturally close
river mouths, typically during the Spring, Summer, and fall when
river flows are insufficient to keep the river mouth clear of
alongshore sediment delivery and accumulation from the ocean. When
river flows wane and beach bars block the surface connection of
the river with the ocean, estuaries can fill up with river waters
that continue to trickle in, creating backwater coastal lagoons
that can extend miles inland, depending on the configuration of
the valley. Reconnection and draining of these lagoons occurs
naturally, although in many locations drainage occurs at a stage
above low-elevation infrastructure. Artificial drainage of these
lagoons below critical flood levels is the primary and historical
tactic employed by local water management agencies; however, this
practice has fallen out of favor because of the threat this
imposes on environmental resources and habitat. Much research and
planning is currently being directed towards developing strategies
to manage water levels in estuaries and lagoons that reduce flood
threat while simultaneously managing the ecosystem in a
sustainable, healthy manner.

Most large and small creeks/rivers that meet the coastline in
California exhibit beach-barrier bars and seasonally-impounded
lagoons. Examples in our area include the Russian River estuary
at Jenner, the San Lorenzo river at the beach boardwalk, the
Pajaro river and the Pajaro dunes area, and the Carmel river and
its associated lagoon.

Tsunamis

A tsunami is a series of long-period waves (on the order
of tens of minutes) that are usually generated by an impulsive
disturbance that displaces massive amounts of water, such as an
earthquake occurring on or near the sea floor. Underwater volcanic
eruptions and landslides can also cause tsunami. The resultant
waves are much the same as waves propagating in a calm pond after
a rock is tossed. While traveling in the deep oceans, tsunami have
extremely long wavelengths, often exceeding 50 nm, with small
amplitudes (a few tens of centimeters) and negligible wave
steepness, which in the open ocean would cause nothing more than a
gentle rise and fall for most vessels, and possibly go unnoticed.
Tsunami travel at very high speeds, sometimes in excess of 400
knots. Across the open oceans, these high-speed waves lose very
little energy. As tsunami reach the shallow waters near the coast,
they begin to slow down while gradually growing steeper, due to
the decreasing water depth. The building walls of water can become
extremely large in height, reaching tens of meters (30 feet or
more) as they reach the shoreline. The effects can be further
amplified where a Bay, Harbor, or lagoon funnels the waves as they
move inland. Large tsunami have been known to rise to over 100
feet! The amount of water and energy contained in tsunami can have
devastating effects on coastal areas.

Coastal floodplains and estuaries are commonly used for
residential and Industrial development and/or recreational
activities. People inhabiting these areas, as well as those
conducting business or recreational pursuits there should be
vigilant of The Hazards that may develop. Stay alert, and listen
for warnings and other notifications of coastal flooding other
hazards along the coast from your local Weather Service office and
local emergency management personnel.

Join US tomorrow for information on flood safety and flood
information tools.

&&

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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