Alert archive / California / High Surf Advisories in 2018

High Surf Advisory 3, NWS San Francisco Bay Area, CA

November 26, 20186 counties in California

NWS San Francisco Bay Area, CA issued this high surf advisory at Nov 26, 2018, 12:06 PM PST for 6 counties in California. It took effect at Nov 27, 2018, 10:00 AM PST. It was in force for 3 days.

The area

The counties it named.

The facts

Issued
Nov 26, 2018, 12:06 PM PST (20:06 UTC)
In effect from
Nov 27, 2018, 10:00 AM PST
Expired
Nov 30, 2018, 9:00 PM PST
In force
3 days
Issued by
NWS San Francisco Bay Area, CA

Counties City and County of San Francisco, CA, Marin County, CA, Monterey County, CA, San Mateo County, CA, Santa Cruz County, CA, Sonoma County, CA

The radar

The San Francisco radar (KMUX), 53 km from the middle of the area, began a volume at 20:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 8.1 hours before the alert went out and 26 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 12:00Z on 2018-11-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 2018-11-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -25 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1275 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-25 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

727 
WHUS46 KMTR 262006
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
1206 PM PST Mon Nov 26 2018

...Long period swell arriving this week to bring high surf to the
coast...

.A westerly swell with heights of 13 to 16 feet at 17 to 20 
seconds will begin to arrive on Tuesday, peak on Wednesday, and 
gradually subside on Thursday and into early Friday. The swell is
expected to produce breaking waves along the shore around 18 to 
24 feet, with favored locations occasionally exceeding 25 feet.


CAZ006-505-509-270415-
/O.NEW.KMTR.SU.Y.0003.181127T1800Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
1206 PM PST Mon Nov 26 2018

...HIGH SURF ADVISORY IN EFFECT FROM 10 AM TUESDAY TO 4 AM PST
FRIDAY...

The National Weather Service in San Francisco has issued a High
Surf Advisory, which is in effect from 10 AM Tuesday to 4 AM PST
Friday. 

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 17 to
  20 seconds. Breaking waves of 18 to 24 feet, with favored
  locations occasionally exceeding 25 feet.

* TIMING...Forerunner waves arrive on Tuesday with the surf
  peaking on Wednesday and Wednesday night. Waves will begin to
  gradually subside on Thursday and Thursday night.

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-270415-
/O.NEW.KMTR.SU.Y.0003.181128T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
1206 PM PST Mon Nov 26 2018

...HIGH SURF ADVISORY IN EFFECT FROM 4 PM TUESDAY TO 4 AM PST
FRIDAY...

The National Weather Service in San Francisco has issued a High
Surf Advisory, which is in effect from 4 PM Tuesday to 4 AM PST
Friday. 

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 17 to
  20 seconds. Breaking waves of 18 to 24 feet, with favored
  locations occasionally exceeding 25 feet.

* TIMING...Forerunner waves arrive on Tuesday with the surf
  peaking on Wednesday and Wednesday night. Waves will begin to
  subside on Thursday and Thursday night.

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
10 follow-up statements
988 
WHUS46 KMTR 262348
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
348 PM PST Mon Nov 26 2018

...Long period swell arriving this week to bring high surf to the
coast...

.A westerly swell with heights of 13 to 16 feet at 17 to
20 seconds will begin to arrive on Tuesday, peak on Wednesday,
and gradually subside on Thursday and into early Friday. The
swell is expected to produce breaking waves along the shore
around 18 to 24 feet, with favored locations occasionally
exceeding 25 feet.

CAZ006-505-509-271500-
/O.CON.KMTR.SU.Y.0003.181127T1800Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
348 PM PST Mon Nov 26 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM TUESDAY TO
4 AM PST FRIDAY...

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 17 
  to 20 seconds. Breaking waves of 18 to 24 feet, with favored 
  locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive on Tuesday with the surf 
  peaking on Wednesday and Wednesday night. Waves will begin to 
  gradually subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-271500-
/O.CON.KMTR.SU.Y.0003.181128T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
348 PM PST Mon Nov 26 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 4 PM TUESDAY TO 4 AM
PST FRIDAY...

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 17 
  to 20 seconds. Breaking waves of 18 to 24 feet, with favored 
  locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive on Tuesday with the surf 
  peaking on Wednesday and Wednesday night. Waves will begin to 
  subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
344 
WHUS46 KMTR 271056
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
256 AM PST Tue Nov 27 2018

...Long period swell arriving this week to bring high surf to the
coast...

.A westerly swell with heights of 13 to 16 feet at 16 to
20 seconds will begin to arrive today, peak on Wednesday, and 
gradually subside on Thursday and into early Friday. The swell is 
expected to produce breaking waves along the shore around 18 to 24
feet, with favored locations occasionally exceeding 25 feet.

CAZ006-505-509-272300-
/O.CON.KMTR.SU.Y.0003.181127T1800Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
256 AM PST Tue Nov 27 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO 4 AM PST FRIDAY...

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 16 
  to 20 seconds. Breaking waves of 18 to 24 feet, with favored 
  locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive today with the surf peaking on
  Wednesday and Wednesday night. Waves will begin to gradually 
  subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-272300-
/O.CON.KMTR.SU.Y.0003.181128T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
256 AM PST Tue Nov 27 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 4 PM THIS AFTERNOON
TO 4 AM PST FRIDAY...

* WAVES AND SURF...Large westerly swell of 13 to 16 feet at 16 
  to 20 seconds. Breaking waves of 18 to 24 feet, with favored 
  locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive on Tuesday with the surf 
  peaking on Wednesday and Wednesday night. Waves will begin to 
  subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
069 
WHUS46 KMTR 272228
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
228 PM PST Tue Nov 27 2018

...Long period swell arriving this week to bring high surf to the
coast...

.A west to northwest swell with heights of 13 to 16 feet at 16 to
20 seconds will begin to arrive today, peak on Wednesday, and 
gradually subside on Thursday and into early Friday. The swell is 
expected to produce breaking waves along the shore around 18 to 24
feet, with favored locations occasionally exceeding 25 feet.

CAZ006-505-509-281100-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
228 PM PST Tue Nov 27 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 feet
  at 16 to 20 seconds. Breaking waves of 18 to 24 feet, with 
  favored locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive today with the surf peaking 
  on Wednesday and Wednesday night. Waves will begin to 
  gradually subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-281100-
/O.CON.KMTR.SU.Y.0003.181128T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
228 PM PST Tue Nov 27 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 feet
  at 16 to 20 seconds. Breaking waves of 18 to 24 feet, with 
  favored locations occasionally exceeding 25 feet. 

* TIMING...Forerunner waves arrive today with the surf peaking on
  Wednesday and Wednesday night. Waves will begin to subside on 
  Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
078 
WHUS46 KMTR 280952
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
152 AM PST Wed Nov 28 2018

...Long period swell arriving this week to bring high surf to the
coast...

.A west to northwest swell with heights of 13 to 16 feet at 16 to
20 seconds will peak today, and gradually subside on Thursday and
into early Friday. The swell is expected to produce breaking 
waves along the shore around 18 to 24 feet, with favored locations
occasionally exceeding 25 feet.

CAZ006-505-509-282300-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
152 AM PST Wed Nov 28 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 
  feet at 16 to 20 seconds. Breaking waves of 18 to 24 feet, 
  with favored locations occasionally exceeding 25 feet. 

* TIMING...Surf peaks today through tonight. Waves will begin to 
  gradually subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-282300-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
152 AM PST Wed Nov 28 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 
  feet at 16 to 20 seconds. Breaking waves of 18 to 24 feet, 
  with favored locations occasionally exceeding 25 feet. 

* TIMING...Surf peaks today through tonight. Waves will begin to 
  subside on Thursday and Thursday night. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
439 
WHUS46 KMTR 282139
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
139 PM PST Wed Nov 28 2018

...Long period swell this week to bring high surf to the coast...

.A west to northwest swell with heights of 13 to 16 feet at 14 to
18 seconds will continue today and tomorrow before gradually
subsiding late Thursday night and Friday. The swell is expected 
to produce breaking waves along the shore around 18 to 24 feet, 
with favored locations occasionally exceeding 25 feet.

CAZ006-505-509-291000-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
139 PM PST Wed Nov 28 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 feet
  at 14 to 18 seconds. Breaking waves of 18 to 24 feet, with 
  favored locations occasionally exceeding 25 feet. 

* TIMING...High surf will continue today and tomorrow. Waves will
  begin to gradually subside late Thursday night and Friday. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-291000-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
139 PM PST Wed Nov 28 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 13 to 16 feet
  at 14 to 18 seconds. Breaking waves of 18 to 24 feet, with 
  favored locations occasionally exceeding 25 feet. 

* TIMING...High surf will continue today and tomorrow. Waves will
  begin to gradually subside late Thursday night and Friday. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
687 
WHUS46 KMTR 290932
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
132 AM PST Thu Nov 29 2018

...Long period swell this week to bring high surf to the coast...

.A west to northwest swell with heights of 13 to 16 feet at 14 to
18 seconds will continue today before gradually subsiding late 
tonight and Friday. The swell is expected to produce breaking 
waves along the shore around 15 to 22 feet, with favored 
locations occasionally exceeding 24 feet.

CAZ006-505-509-292300-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
132 AM PST Thu Nov 29 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 12 to 15 
  feet at 13 to 16 seconds. Breaking waves of 16 to 22 feet, 
  with favored locations occasionally exceeding 24 feet. 

* TIMING...High surf will continue today. Waves will begin to
  gradually subside late tonight and Friday. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-292300-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
132 AM PST Thu Nov 29 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 12 to 15 
  feet at 13 to 16 seconds. Breaking waves of 16 to 22 feet, 
  with favored locations occasionally exceeding 24 feet. 

* TIMING...High surf will continue today. Waves will begin to
  gradually subside late tonight and Friday. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
298 
WHUS46 KMTR 292232
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
232 PM PST Thu Nov 29 2018

CAZ006-505-509-300700-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
232 PM PST Thu Nov 29 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 12 to 15 
  feet at 13 to 16 seconds. Breaking waves of 16 to 22 feet, 
  with favored locations occasionally exceeding 24 feet. 

* TIMING...High surf will continue today. Waves will begin to
  gradually subside late tonight into early Friday morning. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-300700-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181130T1200Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
232 PM PST Thu Nov 29 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY...

* WAVES AND SURF...Large west to northwest swell of 12 to 15 
  feet at 13 to 16 seconds. Breaking waves of 16 to 22 feet, 
  with favored locations occasionally exceeding 24 feet. 

* TIMING...High surf will continue today. Waves will begin to
  gradually subside late tonight into early Friday morning. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
780 
WHUS46 KMTR 301113
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
313 AM PST Fri Nov 30 2018

CAZ006-505-509-301700-
/O.EXT.KMTR.SU.Y.0003.000000T0000Z-181130T1700Z/
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
San Francisco Peninsula Coast-
313 AM PST Fri Nov 30 2018

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WAVES AND SURF...Large west to northwest swell of 12 to 14 feet
  at 13 to 15 seconds. Breaking waves of 16 to 20 feet, with 
  favored locations occasionally exceeding 23 feet. 

* TIMING...High surf will continue through 9am this morning. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

CAZ529-530-301700-
/O.EXT.KMTR.SU.Y.0003.000000T0000Z-181130T1700Z/
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
313 AM PST Fri Nov 30 2018

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 9 AM PST THIS MORNING...

* WAVES AND SURF...Large west to northwest swell of 12 to 14 feet
  at 13 to 15 seconds. Breaking waves of 16 to 20 feet, with 
  favored locations occasionally exceeding 23 feet. 

* TIMING...High surf will continue through 9am this morning. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
934 
WHUS46 KMTR 301634
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
834 AM PST Fri Nov 30 2018

CAZ505-302300-
/O.EXT.KMTR.SU.Y.0003.000000T0000Z-181130T2300Z/
Coastal North Bay Including Point Reyes National Seashore-
834 AM PST Fri Nov 30 2018

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 3 PM PST THIS
AFTERNOON...

* WAVES AND SURF...West to northwest swell of 12 to 14 feet at 13
  to 15 seconds, decreasing to 10 to 12 feet at 11 to 13 seconds
  by the afternoon. Breaking waves of 16 to 20 feet this morning,
  decreasing to 13 to 17 feet this afternoon. Favored locations 
  occasionally exceeding 23 feet this morning. 

* TIMING...High surf will continue into the afternoon hours.

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory means that high surf will affect beaches in 
the advisory area...producing rip currents and localized beach 
erosion.

&&

$$

CAZ006-509-529-530-302300-
/O.EXT.KMTR.SU.Y.0003.000000T0000Z-181201T0500Z/
San Francisco-San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
834 AM PST Fri Nov 30 2018

...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 9 PM PST THIS EVENING...

* WAVES AND SURF...West to northwest swell of 12 to 14 feet at 13
  to 15 seconds, decreasing to 10 to 12 feet at 11 to 13 seconds
  by the afternoon. Breaking waves of 16 to 20 feet this morning,
  decreasing to 13 to 17 feet this afternoon and evening. Favored
  locations occasionally exceeding 23 feet this morning. 

* TIMING...High surf will continue into the afternoon and evening
  hours.

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$
018 
WHUS46 KMTR 302251
CFWMTR

Coastal Hazard Message
National Weather Service San Francisco Bay Area
251 PM PST Fri Nov 30 2018


CAZ505-010000-
/O.EXP.KMTR.SU.Y.0003.000000T0000Z-181130T2300Z/
Coastal North Bay Including Point Reyes National Seashore-
251 PM PST Fri Nov 30 2018

...HIGH SURF ADVISORY WILL EXPIRE AT 3 PM PST THIS AFTERNOON...

Swell heights continue to decrease through tonight. The high surf
advisory will be allowed to expire at 3 pm.

$$

CAZ006-509-529-530-010500-
/O.CON.KMTR.SU.Y.0003.000000T0000Z-181201T0500Z/
San Francisco-San Francisco Peninsula Coast-Northern Monterey Bay-
Southern Monterey Bay and Big Sur Coast-
251 PM PST Fri Nov 30 2018

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 9 PM PST THIS
EVENING...

* WAVES AND SURF...West to northwest swell of 11 to 13 feet at 11
  to 13 seconds. Breaking waves of 16 to 20 feet decreasing to 13
  to 17 feet this afternoon and evening.  

* TIMING...High surf will continue into the afternoon and 
  evening hours. 

* IMPACTS...Impacts include strong rip currents, large run-up 
  waves, and localized beach erosion. Never turn your back to 
  the ocean! 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A High Surf Advisory Means That High Surf Will Affect Beaches In
The Advisory area...producing rip currents and localized beach
erosion.

&&

$$

What forecasters said that day

The local office's own words before this high surf advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this high surf advisory went out at Nov 26, 9:32 AM PST, 2 hours 34 minutes earlier.

Area forecast discussion, Nov 26, 9:32 AM PST, 2 hours 34 minutes before
Area Forecast Discussion
National Weather Service San Francisco Bay Area
932 AM PST Mon Nov 26 2018

.SYNOPSIS...Dry and mild weather is forecast to continue today.
Patchy dense fog is possible through mid morning, mainly in the
North Bay Valleys. A frontal boundary will spread light to
moderate rain across the North Bay on Tuesday morning. Rainfall
will taper off south of the Golden Gate on Tuesday afternoon and
evening as the frontal boundary dissipates. Moist westerly flow
will maintain rain chances Tuesday night and Wednesday. A stronger
storm system will then likely bring widespread moderate to
locally heavy rain to our entire region from Wednesday night into
Thursday morning, along with strong and gusty winds. Showers will
follow Thursday afternoon and evening. Friday may be a dry day
before rain chances return over the weekend.

&&

.DISCUSSION...as of 09:05 AM PST Monday...The ongoing forecast
remains on track in the short-term. Increased mid/high level cloud
cover will continue to advect inland from the northwest today with
temperatures generally in the 60s across the San Francisco Bay
Area and along the coast with lower 70s for interior portions of
the Central Coast. Please see the previous forecast discussion
below for additional details on the incoming system(s) set to
bring widespread rainfall and breezy to locally gusty winds to the
region Tuesday into midweek.

&&

.PREV DISCUSSION...As of 3:25 AM PST Monday...Skies remain mostly
clear early this morning although satellite and surface
observations indicate patchy fog in the North Bay. Surface
dewpoints in the North and East Bay are currently 3 to 8 degrees
lower compared to 24 hours ago. Thus, fog this morning is not
expected to be as widespread as yesterday morning. Even so, patchy
dense fog is possible in the North and East Bay Valleys and
around the northern San Francisco Bay until a few hours after
sunrise.

Dry and mild weather conditions will continue across our region
today as an upper ridge remains over California for one more day.
High temperatures this afternoon are expected to be similar to
yesterday - mostly in the 60s across the northern and central SF
Bay Area, and mid 60s to lower 70s from Santa Cruz and Santa Clara
Counties southward.

Early morning satellite shows a frontal system beginning to push
into the Pacific Northwest. A plume of moist air flowing along the
frontal boundary contains precipitable water values as high as
1.7 inches. This system is forecast to sag slowly southward and
into northern California over the next 36 hours, bringing rain to
much of our forecast area tomorrow and tomorrow evening. Although
the moisture plume will advance southward along with the frontal
boundary on Tuesday, the system will weaken as it moves south
through our area and thus not take full advantage of rainfall
potential. Light to moderate rain rates are expected in the North
Bay on Tuesday morning, but rainfall is then expected to taper off
south of the Golden Gate on Tuesday afternoon and evening as the
front dissipates. Rainfall totals with this first system on
Tuesday and Tuesday night are forecast to range from 0.5-1.0" in
the North Bay, 0.10-0.50" for the rest of the SF Bay Area and
Santa Cruz County (except locally more in the Santa Cruz
Mountains) and a third of an inch or less for Monterey and San
Benito Counties. Winds are not expected to be much of a factor
with this first system with local gusts of around 30 mph at most
in the North Bay on Tuesday.

After the initial frontal boundary dissipates over the southern
portion of our area on Tuesday night, a moist westerly flow will
continue across our area. However, due to lack of forcing,
rainfall will likely be spotty and mostly light from Tuesday night
through much of Wednesday. However, the GFS shows some higher
intensity precipitation across the far southern portion of our
area on Wednesday morning, possibly associated with an upper jet
max.

The models are coming into relatively good agreement concerning
the time period for heaviest rain and strongest winds this week.
An upper trough is forecast to approach the California coast from
the west by late Wednesday and interact with the moisture plume
that will still be present over central California. Upper jet
dynamics and a deepening surface low associated with this trough
will provide the necessary lift and low level convergence to
generate widespread moderate to locally heavy rain across our area
on Wednesday night and Thursday morning. The models disagree
somewhat on where the most intense precipitation will be during
this time period, with the NAM and ECMWF focusing the heaviest
rain across the southern portion of our area, while the GFS places
the most intense rain across the northern portion. The upshot is
that our entire forecast area should be prepared for potential
heavy rain rates on Wednesday night and Thursday morning. In
addition, a surface low is forecast to deepen to about 994 mb off
the northern California coast by late Wednesday night. This will
result in locally strong and gusty southerly winds across our
forecast area on Wednesday night, switching to westerly and
remaining gusty after frontal passage on Thursday. Wind advisories
may be needed Wednesday night through at least midday Thursday.
Finally, this system may be vigorous enough to generate
thunderstorms, especially along the cold frontal boundary late
Wednesday night and Thursday morning. Have not yet added
thunderstorm chances to the forecast and will wait until the
timing is a bit more certain. Showers will continue through
Thursday afternoon and evening. The models agree that most shower
activity will end by late Thursday night. Rainfall totals with
this second system from late Wednesday through late Thursday are
forecast to range from 1 to 2 inches at lower elevations and from
2 to 4 inches in the hills (with locally higher amounts certainly
possible).

Friday currently looks like a dry day before the next system
is forecast to swoop in from the northwest and bring another round
of precipitation to our area from late Friday night through
Saturday.

&&

.AVIATION...As of 9:34 AM PST Monday...for 18Z TAFs. Visible
satellite imagery shows plenty of high clouds streaming over
northern California, and will continue to spread south and east
through the day. VFR conditions are forecast to prevail at the TAF
sites during the day with the BKN to OVC decks around 15,000 to
20,000 ft AGL. Started to introduce the next chance of rain to the
STS, SFO, and OAK TAFs as the next system is forecast to begin
impacting the area on Tuesday.

Vicinity of KSFO...VFR conditions are forecast to prevail today
with passing BKN to OVC high clouds. Light winds this morning will
become west to northwest in the afternoon, generally around 5 to
10 kt.

SFO Bridge Approach...Similar to KSFO.

Monterey Bay Terminals...VFR conditions are expected to prevail
through the day. Chance of low clouds return to SNS and MRY
overnight, but confidence remains low.

&&

.MARINE...as of 9:05 AM PST Monday...Light northerly winds this
morning will become southerly over the next 12 hours ahead of the
next approaching storm system. Expect the southerly winds to
increase tomorrow as a warm front approaches from the west. Mixed
moderate northwest and light southerly swell will continue today
before a much larger westerly swell arrives by midweek.

&&

.MTR WATCHES/WARNINGS/ADVISORIES...
     .Tday...NONE.

&&

PUBLIC FORECAST: RGass/Dykema
AVIATION: Rowe
MARINE: Rowe

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Hazardous weather outlook, Nov 26, 4:49 AM PST, 7 hours 17 minutes before
Hazardous Weather Outlook
National Weather Service San Francisco CA
449 AM PST Mon Nov 26 2018

CAZ006-505>513-516>518-528>530-271400-
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-
449 AM PST Mon Nov 26 2018

This hazardous weather outlook is for the San Francisco Bay Area
and Monterey Bay Area.

.DAY ONE...Monday and Monday night

Patchy dense fog is possible through mid morning Monday,
especially in the North Bay Valleys. Otherwise, expect continued
dry and mild weather.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

An active weather pattern will redevelop by Tuesday as a weather
system spreads light to moderate rain across much of the region.
Periods of rain will then likely continue Tuesday night and into
Wednesday.

A second, stronger, system is then forecast to impact the region
on Wednesday night and Thursday. Hazards associated with this
second system include:

* Widespread moderate to heavy rain, especially Wednesday night
  and Thursday morning. Heavy rain rates may result in temporary
  local flooding of low lying areas and ponding on roadways.
  Mudslides are possible along Highway 1 in Big Sur.

* Strong and gusty winds. Southerly winds will increase late
  Wednesday and be locally strong and gusty Wednesday night.
  Winds will then shift to the west on Thursday and remain gusty.
  Wind advisories may be needed for Wednesday night and Thursday,
  especially in coastal and higher elevation locations.

* There is also a potential for isolated thunderstorms Wednesday
  night and Thursday morning.

In addition, storms this week will generate high surf. High surf
will arrive along the coast beginning on Tuesday and continue
through Thursday. High surf advisories are likely.

Please continue to monitor the latest forecasts and be prepared
for wet and windy weather this week, especially on Wednesday night
and Thursday.

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 26, 2:55 AM PSTSmall Craft AdvisoryMTR69 hr
Nov 26, 2:41 PM PSTSmall Craft Advisory for Rough BarMTR66 hr
Nov 26, 2:41 PM PSTSmall Craft AdvisoryMTR57 hr

Nearby

High Surf Advisories in California, 2018Every high surf advisory in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.