Flood Watch 2, NWS San Francisco Bay Area, CA

406 
WGUS66 KMTR 191323
FFAMTR

Flood Watch
National Weather Service San Francisco Bay Area
523 AM PST Sun Feb 19 2017

...INCREASED FLOOD RISK AS AN ATMOSPHERIC RIVER IMPACTS THE
REGION THROUGH LATE MONDAY...

.A potent storm will bring another round of heavy rainfall to the
greater San Franciso and Monterey Bay areas beginning by late
this afternoon into late Monday. Additional rainfall on already
saturated soils will increase the threat for flash flooding,
flooding of area creeks, streams and low lying, poorly drained
areas across the region. The threat for rock/mud slides and
shallow landslides also exists as well as increased likelihood for
downed trees, power lines and damage to or washed out roadways.

CAZ006-505>513-516>518-528>530-192300-
/O.CON.KMTR.FA.A.0002.170220T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
523 AM PST Sun Feb 19 2017

...FLOOD WATCH REMAINS IN EFFECT FROM 4 PM PST THIS AFTERNOON
THROUGH LATE MONDAY NIGHT...

The Flood Watch continues for

* A portion of western California...including the following 
  areas...Coastal North Bay Including Point Reyes National 
  Seashore...East Bay Hills and the Diablo Range...East Bay 
  Interior Valleys...Mountains Of San Benito County And Interior 
  Monterey County Including Pinnacles National Park...North Bay 
  Interior Valleys...North Bay Mountains...Northern Monterey 
  Bay...Northern Salinas Valley/Hollister Valley and Carmel 
  Valley...San Francisco...San Francisco Bay Shoreline...San 
  Francisco Peninsula Coast...Santa Clara Valley Including San 
  Jose...Santa Cruz Mountains...Santa Lucia Mountains and Los 
  Padres National Forest...Southern Monterey Bay and Big Sur 
  Coast and Southern Salinas Valley/Arroyo Seco and Lake San 
  Antonio. 

* From 4 PM PST this afternoon through late Monday night

* Heavy rainfall is anticipated to fall on already saturated
  soils, elevated streams and filling reservoirs.

* Impacts include enhanced runoff/flooding in low lying areas and
  waterways, rising water levels/flooding in area streams, creeks
  and rivers. Increased risk of rock/mud slides in steep terrain,
  downed trees, power lines and damaged to or washed out
  roadways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$

778 
WGUS66 KMTR 192018
FFAMTR

Flood Watch
National Weather Service San Francisco Bay Area
1218 PM PST Sun Feb 19 2017

...INCREASED FLOOD RISK AS AN ATMOSPHERIC RIVER IMPACTS THE
REGION THROUGH LATE MONDAY...

.A potent storm will bring another round of heavy rainfall to the
greater San Franciso and Monterey Bay areas beginning by late
this afternoon into late Monday. Additional rainfall on already
saturated soils will increase the threat for flash flooding...
flooding of area creeks... streams and low lying... poorly
drained areas across the region. The threat for rock/mud slides
and shallow landslides also exists as well as increased
likelihood for downed trees... power lines and damage to or
washed out roadways.

CAZ006-505>513-516>518-528>530-201500-
/O.CON.KMTR.FA.A.0002.170220T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
1218 PM PST Sun Feb 19 2017

...FLOOD WATCH REMAINS IN EFFECT FROM 4 PM PST THIS AFTERNOON
THROUGH LATE MONDAY NIGHT...

The Flood Watch continues for

* A portion of western California...including the following 
  areas...Coastal North Bay Including Point Reyes National 
  Seashore...East Bay Hills and the Diablo Range...East Bay 
  Interior Valleys...Mountains Of San Benito County And Interior 
  Monterey County Including Pinnacles National Park...North Bay 
  Interior Valleys...North Bay Mountains...Northern Monterey 
  Bay...Northern Salinas Valley/Hollister Valley and Carmel 
  Valley...San Francisco...San Francisco Bay Shoreline...San 
  Francisco Peninsula Coast...Santa Clara Valley Including San 
  Jose...Santa Cruz Mountains...Santa Lucia Mountains and Los 
  Padres National Forest...Southern Monterey Bay and Big Sur 
  Coast and Southern Salinas Valley/Arroyo Seco and Lake San 
  Antonio. 

* From 4 PM PST this afternoon through late Monday night

* Heavy rainfall is anticipated to fall on already saturated 
  soils... elevated streams and filling reservoirs. 

* Impacts include enhanced runoff/flooding in low lying areas 
  and waterways...ising water levels/flooding in area streams... 
  creeks and rivers. Increased risk of rock/mud slides in steep 
  terrain... downed trees... power lines and damaged to or 
  washed out roadways. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$

452 
WGUS66 KMTR 200022
FFAMTR

Flood Watch
National Weather Service San Francisco Bay Area
422 PM PST Sun Feb 19 2017

...INCREASED FLOOD RISK AS AN ATMOSPHERIC RIVER IMPACTS THE
REGION THROUGH MONDAY NIGHT...

.A potent storm will bring another round of heavy rainfall to the
greater San Franciso Bay Area and Monterey Bay Area beginning late
Sunday and continuing through Monday Night. A prolonged period of
moderate to heavy rainfall on already saturated soils will
increase the threat for flash flooding...flooding of area
creeks...streams and rivers as well as flooding of low
lying...poorly drained areas across the region. The threat for
rock/mud slides and shallow landslides also exists as well as
increased likelihood for downed trees... power lines and damage to
or washed out roadways.

CAZ006-505>513-516>518-528>530-201800-
/O.CON.KMTR.FA.A.0002.000000T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
422 PM PST Sun Feb 19 2017

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE MONDAY NIGHT...

The Flood Watch continues for

* A portion of western California...including the following 
  areas...Coastal North Bay Including Point Reyes National 
  Seashore...East Bay Hills and the Diablo Range...East Bay 
  Interior Valleys...Mountains Of San Benito County And Interior 
  Monterey County Including Pinnacles National Park...North Bay 
  Interior Valleys...North Bay Mountains...Northern Monterey 
  Bay...Northern Salinas Valley/Hollister Valley and Carmel 
  Valley...San Francisco...San Francisco Bay Shoreline...San 
  Francisco Peninsula Coast...Santa Clara Valley Including San 
  Jose...Santa Cruz Mountains...Santa Lucia Mountains and Los 
  Padres National Forest...Southern Monterey Bay and Big Sur 
  Coast and Southern Salinas Valley/Arroyo Seco and Lake San 
  Antonio. 

* Through late Monday night

* A prolonged period of moderate to heavy rainfall is anticipated
  to fall on already saturated soils from late Sunday night
  through Monday evening. This will result in sharp rises on area
  rivers and streams and will likely result in flooding.

* Impacts include enhanced runoff and associated flooding in low
  lying areas and waterways, rising water levels and flooding on
  area streams, creeks and rivers. Other impacts include increased
  risk of rock/mud slides in steep terrain, downed trees and power
  lines, and damaged to or washed out roadways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$

774 
WGUS66 KMTR 201312
FFAMTR

Flood Watch
National Weather Service San Francisco Bay Area
512 AM PST Mon Feb 20 2017

...INCREASED FLOOD RISK AS AN ATMOSPHERIC RIVER IMPACTS THE
REGION THROUGH LATE MONDAY EVENING...

.A potent storm system impacting the region will result in heavy
rainfall across the greater San Franciso Bay Area and Monterey
through at least late Monday evening. A prolonged period of
moderate to heavy rainfall on already saturated soils will
increase the threat for flash flooding, flooding of area
creeks, streams and rivers as well as flooding of low lying, poorly
drained areas across the region. The threat for rock/mud slides
and shallow landslides also exists as well as increased likelihood
for downed trees, power lines and damage to or washed out
roadways.

CAZ006-505>513-516>518-528>530-210500-
/O.CON.KMTR.FA.A.0002.000000T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
512 AM PST Mon Feb 20 2017

...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT...

The Flood Watch continues for

* A portion of western California...including the following 
  areas...Coastal North Bay Including Point Reyes National 
  Seashore...East Bay Hills and the Diablo Range...East Bay 
  Interior Valleys...Mountains Of San Benito County And Interior 
  Monterey County Including Pinnacles National Park...North Bay 
  Interior Valleys...North Bay Mountains...Northern Monterey 
  Bay...Northern Salinas Valley/Hollister Valley and Carmel 
  Valley...San Francisco...San Francisco Bay Shoreline...San 
  Francisco Peninsula Coast...Santa Clara Valley Including San 
  Jose...Santa Cruz Mountains...Santa Lucia Mountains and Los 
  Padres National Forest...Southern Monterey Bay and Big Sur 
  Coast and Southern Salinas Valley/Arroyo Seco and Lake San 
  Antonio. 

* Through late tonight

* A prolonged period of moderate to heavy rainfall is anticipated
  to fall on already saturated soils through Monday evening. This
  will result in sharp rises on area creeks, streams and rivers and
  will likely result in flooding.

* Impacts include enhanced runoff and associated flooding in low
  lying areas and waterways, rising water levels and flooding on
  area streams, creeks and rivers. Other impacts include increased
  risk of rock/mud slides in steep terrain, downed trees and power
  lines, and damaged to or washed out roadways.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Flood Watch means there is a potential for flooding based on
current forecasts.

You should monitor later forecasts and be alert for possible
Flood Warnings. Those living in areas prone to flooding should be
prepared to take action should flooding develop.

&&

$$

072 
WGUS66 KMTR 211020
FFAMTR

Flood Watch
National Weather Service San Francisco Bay Area
220 AM PST Tue Feb 21 2017

CAZ006-505>513-516>518-528>530-211130-
/O.CAN.KMTR.FA.A.0002.000000T0000Z-170221T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of...San Francisco...Tamalpais-Homestead...
Sausalito...Santa Rosa...South Santa Rosa...Napa...San Rafael...
Petaluma...Novato...Rohnert Park...Angwin...
Lagunitas-Forest Knolls...Woodacre...Oakland...Fremont...
Hayward...Daly City...Berkeley...Pacifica...Concord...Antioch...
Livermore...Walnut Creek...Pleasanton...Pittsburg...San Ramon...
Blackhawk...Scotts Valley...Boulder Creek...Day Valley...
San Jose...Greenfield...King City...Salinas...Santa Cruz...
Watsonville...Live Oak...Seaside...Monterey...Marina
220 AM PST Tue Feb 21 2017

...FLOOD WATCH IS CANCELLED...

The Flood Watch San Francisco Bay Area and Monterey Bay Region
has been cancelled. While lingering showers will persist through
the morning and early afternoon, the threat for widespread
flooding has diminished.

$$

Area Forecast Discussion
National Weather Service San Francisco Bay Area
1001 AM PST Sat Feb 18 2017

.SYNOPSIS...Scattered showers will diminish in coverage through
the day with a period of dry weather conditions possible tonight.
Widespread rainfall set to return to the region on Sunday during
the day with periods of moderate to heavy rainfall likely Sunday
night into Monday. Stronger southerly winds and widespread
flooding will be likely as an atmospheric river takes aim
somewhere along the central California Coast.

&&

.DISCUSSION...as of 09:00 AM PST Saturday... The storm system
which rapidly strengthened off of our coast yesterday morning has
shifted eastward into the intermountain west. Only some
diminishing rain showers and breezy winds are persisting primarily
over Monterey and San Benito counties in the wake of the last
system. This system was the first in yet another series of systems
forecast to impact the forecast area.

All eyes are now on the next storm system anticipated bring
another round of heavy rain and strong winds between late Sunday
afternoon into Monday. Lingering showers will then persist Monday
before another, yet weaker, system arrives Tuesday into
Wednesday. Thursday into possibly Friday looks dry. Model
confidence drops off moving into next weekend, however, most model
solutions look unsettled, with one system arriving Saturday, and
another early next week.

For the next system, the most important factor at play is the
positioning of the precipitable water plume as it will determine
which areas will see the heaviest rainfall as well as the amount
of orographic enhancement/rain shadowing possible. Short term
models are not currently in agreement with this exact positioning,
despite the storm only begin about 36 hours out, thus lowering
model confidence of specific positioning and rainfall amounts at
this point. That said, on average, models appear to aim the bulk
of initial moisture towards Big Sur, before shifting the plume
northward towards the Santa Cruz mountains, then towards the North
Bay, before shifting southwards once again over the Santa Cruz
mountains. Given this trajectory, it seems plausible that the
highest rainfall amounts will be over the Santa Cruz mountains
through the duration of the event. Rainfall amounts will be
highest over the coastal ranges, with 3-6 inches possible over
elevated terrain, locally higher over the largest orographically
favored peaks. Most valley locations can expect 1-2.5 inches, with
locally higher amounts to around 3.5 inches in the North Bay
valleys. Gusty southerly winds will accompany this storm as well,
however, speeds will not be nearly as strong as with the last
system. Pinpointing the rainfall timing and amounts of tomorrow's
system will be the forecast focus of the day. An areal flood watch
for the entire forecast area will be issued shortly in
anticipation of this system.

This storm system is anticipated to further exacerbate
deteriorating conditions in and around our area's infrastructure.
Given our already saturated soils, the upcoming rainfall will
predominately runoff into streams and river or pool in low lying
areas, leading to increased likelihood of urban and small stream
flooding. Additionally, increased risk of mud/rock slides are
anticipated, especially over steep terrain, which can result in
roads being damaged or destroyed, as we have seen already many
times this year. Furthermore, downed trees and power outages can
be expected as well. Be sure to plan ahead if travel is necessary
and check the latest road conditions available from CalTrans
websites. Turn around, don't drown, flooded areas can be
deceptively deep.

See previous discussion for specifics relating to the current
forecast package. Next forecast package will be issued early this
afternoon.

.PREVIOUS DISCUSSION...as of 03:02 AM PST Saturday...Scattered
showers continue to move across the region this morning as the
main mid/upper level trough axis shifts inland. Rainfall amounts
have been spotty with generally a few hundredths of an inch per
hour with locally higher amounts near 0.25"/hr within heavier
showers. Expecting showers to diminish in coverage through mid
morning with periods of dry weather conditions forecast across the
region this afternoon and evening. This "dry slot" can be seen on
satellite imagery in wake of the trough aloft and our next system
developing out over the Pacific.

While most areas will remain dry through tonight, cannot rule out
light precipitation across portions of the region. Light rain will
increase in coverage early Sunday morning, first across the North
Bay and along the coastal ranges deeper moisture offshore advects
inland. The forecast models then show a deeper atmospheric
river(AR) with PWAT values in excess of 1.25" reaching the Central
Coast by Sunday afternoon. At first, widespread rain is forecast
to develop across much of the region with the heaviest occuring
across the coastal ranges. The AR and associated band of
precipitation is then forecast to narrow and potentially work
northward resulting in moderate to heavy rainfall as it points
toward the central California coast. As typical with any AR event,
the main forecast challenge remains exactly where the heaviest
band of precipitation will develop as well as the movement or
stalling of said boundary. At this time, it appears the main focus
will be somewhere between the Santa Cruz Mountains northward into
the North Bay from late Sunday afternoon into Monday morning
before the system eventually shifts southward and inland in
response to an approaching mid/upper level system.

Given the fact that the entire region has been battered by system
after system so far this winter and soils remain super saturated,
widespread flooding will be likely from Sunday into Monday! Not
only is widespread moderate to locally heavy rainfall likely,
southerly winds will again increase out head of this system and
will yet again result in downed trees, power outages and further
deterioration of the region's infrastructure. Flooding of area
creeks, streams, low lying areas as well as rises on the main stem
rivers will also be likely. While it remains difficult to forecast
exact rainfall amounts, there is the potential for widespread
2.50" to 3.50" across the North Bay and 1.00" to 3.00" amounts in
other urban areas across the region. Inland valley locations,
especially across the Salinas and Santa Clary Valleys will likely
see lesser amounts depending on where the AR takes aim. Meanwhile,
the North Bay Mountains and coastal ranges southward will likely
see rainfall totals of 3.00" to 6.00" with the potential for some
areas to pick up as much as 10.00" from Sunday afternoon into
Monday. Folks living in flood prone areas are urged to remain
vigilant of the latest forecast and should take necessary measures
to protect life and property in advance of this upcoming storm
system.

Lingering showers are then likely from Monday night into Tuesday
in wake of the heavier precipitation forecast to shift
inland/southward. The forecast models have backed off on the
strength of the subsequent system expected to sweep through
Tuesday night into Wednesday as a mid/upper level system traverses
the region. However, do expect another round of at least light
precipitation to move across as the main upper level trough pushes
inland.

By Wednesday night and especially Thursday, dry weather
conditions are forecast to return to the region as high pressure
develops in wake of the exiting trough. Temperatures late next
week are forecast to be generally below seasonal averages as a
cooler air mass settles in over the region. It is worth noting
that the GFS shows a cool, weak system dropping in across the
region by next weekend while the ECMWF maintains dry weather
conditions. At this time, will keep a generally dry forecast from
late next week into the following weekend as trends favor drier
conditions.

&&

.AVIATION...As of 10:00 AM PST Saturday...High pressure is
building in from the eastern Pacific this morning resulting in
gusty NW winds primarily along the immediate coast. Scattered
showers gradually diminishing today. VFR/MVFR however moist air
resulting in localized IFR for a few more hours this morning.
Mixing winds will help lift cigs and improve visibilities today.

Vicinity of KSFO...VFR/MVFR. Gusty W-NW winds today into this
evening.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...Localized IFR otherwise MVFR/VFR today.
Scattered showers early. Gusty W-NW winds.

&&

.MARINE...as of 08:34 AM PST Saturday...High pressure over the
eastern pacific is building in this morning causing strong and
gusty northwest winds. large to very large westerly swell will
build across the waters today mainly from san francisco southward
along the big sur coast. hazardous conditions from squared seas
and steep fresh swell will continue through the weekend. the next
storm system will bring possible gales late sunday into monday.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .Tday...High Surf Advisory until noon today...San Francisco
              and San Francisco Peninsula Coast
             High Surf Advisory until 6pm today...Northern Monterey
              to the Big Sur Coast
             SCA...Pigeon Pt to Pt Pinos 0-10 nm
             SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
             SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm
             SCA...Pt Arena to Pt Reyes 0-10 nm
             SCA...Pt Reyes to Pigeon Pt 0-10 nm
             SCA...Pt Arena to Pigeon Pt 10-60 nm
             SCA...Rough Bar Advisory for SF Bar
             SCA...Mry Bay from 10 AM
             SCA...SF Bay from 12 PM

&&

PUBLIC FORECAST: DRP/RGass
AVIATION: Sims
MARINE: Sims

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Hazardous Weather Outlook
National Weather Service San Francisco Bay Area
531 AM PST Sat Feb 18 2017

CAZ006-505>513-516>518-528>530-191345-
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Southern Salinas Valley/Arroyo Seco and Lake San Antonio-
Santa Lucia Mountains and Los Padres National Forest-
Mountains Of San Benito County And Interior Monterey County
Including Pinnacles National Park-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
531 AM PST Sat Feb 18 2017

This Hazardous Weather Outlook is for portions of Northern
California.

.DAY ONE...Today and Tonight

Isolated to scattered showers will diminish in coverage through
this afternoon with a brief break in rainfall possible tonight.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

A potent storm system and associated atmospheric river will begin
to impact the region by late Sunday morning. This system will
bring light to moderate rain and gusty winds to the region Sunday
with precipitation increasing in coverage and intensity Sunday
night into Monday morning. Periods of moderate to heavy rain will
likely result in widespread flooding of area creeks, streams and
flood prone, low lying areas. The threat for rock/mud slides,
shallow landslides and debris flows in recent burn scar areas will
also increase as a result of this system. Gusty winds will also
result in the potential for downed trees and isolated power
outages.

Lingering showers will then be possible from Monday night into
Wednesday with drying conditions forecast late in the week.

A large swell is also expected to impact the coastal areas
Tuesday into Wednesday with breaking waves potentially up to 25
feet.

.SPOTTER INFORMATION STATEMENT...