Alert archive / California / Beach Hazards Statements in 2017

Beach Hazards Statement 13, NWS San Francisco Bay Area, CA

November 29, 20176 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Nov 29, 2017, 9:24 PM PST for 6 counties in California. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Nov 29, 2017, 9:24 PM PST (05:24 UTC)
Expired
Nov 30, 2017, 3:00 AM PST
In force
6 hr
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 05:26 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 00:00Z, 5.4 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 00:00Z on 2017-11-30Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 2017-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939Sfc1 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
1609 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
-27 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

183 
WHUS46 KMTR 300524
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
924 PM PST WED NOV 29 2017

A LARGE NORTHWEST SWELL WILL CONTINUE TO IMPACT THE CALIFORNIA
COAST THROUGH LATE TONIGHT. SWELL HEIGHTS OF 10 TO 18 FEET AT 15
TO 18 SECONDS CONTINUE TO BE OBSERVED THEREFORE THE BEACH HAZARD
REMAINS IN EFFECT. LARGE SURF, SNEAKER WAVES AND RIP CURRENTS 
WILL PERSIST THROUGH LATE TONIGHT.

CAZ006-505-509-529-530-301100-
/O.EXP.KMTR.BH.S.0012.000000T0000Z-171130T0500Z/
/O.NEW.KMTR.BH.S.0013.171130T0524Z-171130T1100Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
924 PM PST WED NOV 29 2017

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 3 AM PST 
THURSDAY...


THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH
HAZARDS STATEMENT WHICH IS IN EFFECT UNTIL 3 AM PST THURSDAY. 

* SEAS...NORTHWEST SWELLS 10 TO 18 FEET WITH A PERIOD OF 15 TO 18
  SECONDS. 

* TIMING...THROUGH EARLY THURSDAY MORNING

* LOCATION...COASTLINE FROM SONOMA COUNTY SOUTH THROUGH MONTEREY 
  COUNTY. IN PARTICULAR WEST TO NORTHWEST FACING BEACHES... 
  INCLUDING BUT NOT LIMITED TO...OCEAN BEACH...MONTARA STATE 
  BEACH AND MARINA STATE BEACH. 

* POTENTIAL IMPACTS...LARGE SURF...SNEAKER WAVES...AND DANGEROUS 
  RIP CURRENTS. 

A BEACH HAZARD STATEMENT FOR LARGE SURF AND SNEAKER WAVES MEANS
THAT CONDITIONS ARE PRESENT TO SUPPORT A HEIGHTENED RISK OF
UNSUSPECTING BEACH GOERS BEING SWEPT INTO THE SEA BY A WAVE.
PEOPLE WALKING ALONG THE BEACH SHOULD NEVER TURN THEIR BACK TO
THE SEA. FISHERMAN SHOULD AVOID FISHING FROM ROCKS OR JETTIES.

&&

$$
1 follow-up statement
532 
WHUS46 KMTR 301057
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
257 AM PST THU NOV 30 2017

CAZ006-505-509-529-530-301200-
/O.EXP.KMTR.BH.S.0013.000000T0000Z-171130T1100Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
257 AM PST THU NOV 30 2017

...BEACH HAZARDS STATEMENT WILL EXPIRE AT 3 AM PST EARLY THIS
MORNING...

THE LONG-PERIOD NORTHWEST SWELL WILL CONTINUE TO DECREASE THROUGH
THE MORNING HOURS. LOCALLY DANGEROUS RIP CURRENTS WILL STILL BE 
POSSIBLE THROUGH THE DAY. BEACHGOERS ARE ALWAYS ADVISED TO BE 
BE AWARE OF THEIR SURROUNDINGS AND TO TAKE EXTRA CARE WHENEVER 
VENTURING TO OR ALONG THE SHORELINE.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 29, 9:26 PM PSTSmall Craft Advisory for Rough BarMTR6 hr
Nov 29, 9:26 PM PSTSmall Craft AdvisoryMTR6 hr
Nov 30, 2:45 AM PSTSmall Craft Advisory for Hazardous SeasMTR12 hr

Nearby

Beach Hazards Statements in California, 2017Every beach hazards statement in 2017

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.