Alert archive / California / Beach Hazards Statements in 2016

Beach Hazards Statement 18, NWS San Francisco Bay Area, CA

November 6, 20166 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Nov 6, 2016, 8:59 AM PST for 6 counties in California. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued
Nov 6, 2016, 8:59 AM PST (16:59 UTC)
Expired
Nov 6, 2016, 2:00 PM PST
In force
5 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 17:02 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, 5.0 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 2016-11-06Temperature 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 12:00Z on 2016-11-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
707 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
94 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

292 
WHUS46 KMTR 061659
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
859 AM PST SUN NOV 6 2016

...LARGE SURF WILL CONTINUE TO IMPACT THE COASTLINE THROUGH EARLY
AFTERNOON...

.LARGE SWELL MOVING INTO THE CENTRAL COASTAL WATERS HAS LIKELY
PEAKED EARLY THIS MORNING. HOWEVER...LARGE SURF WILL CONTINUE TO
IMPACT THE COAST THROUGH THIS AFTERNOON AS THE SWELL SLOWLY
SUBSIDES. CONDITIONS SHOULD IMPROVE BY LATE THIS AFTERNOON AND
EVENING.

CAZ006-505-509-529-530-062200-
/O.EXP.KMTR.SU.Y.0017.000000T0000Z-161106T1700Z/
/O.NEW.KMTR.BH.S.0018.161106T1700Z-161106T2200Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
859 AM PST SUN NOV 6 2016

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 2 PM PST THIS
AFTERNOON...
...HIGH SURF ADVISORY WILL EXPIRE AT 9 AM PST THIS MORNING...

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH
HAZARDS STATEMENT FOR LARGE SURF...WHICH IS IN EFFECT UNTIL 2 PM
PST THIS AFTERNOON.

* SURF...LARGE...YET SUBSIDING WESTERLY SWELL WILL CONTINUE TO
  RESULT IN BREAKING WAVES IN THE SURF ZONE OF 16 TO 20 FT THIS
  MORNING.

* TIMING...HAZARDOUS CONDITIONS WILL PERSIST THROUGH EARLY
  AFTERNOON BEFORE SUBSIDING BY THIS EVENING.

* LOCATION...ENTIRE COASTLINE FROM SONOMA COUNTY SOUTHWARD THROUGH
  MONTEREY COUNTY.

* POTENTIAL IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL
  LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND
  WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE
  ERRATIC AND UNPREDICTABLE. REMAIN FARTHER BACK FROM THE SURF
  ZONE THAN NORMAL AS THESE LARGE WAVES WILL BE CAPABLE OF
  SWEEPING PEOPLE INTO THE COLD AND TURBULENT OCEAN WATERS. NEVER
  TURN YOUR BACK ON THE OCEAN. MARINERS TRAVERSING THE BAR ARE
  URGED TO EXERCISE EXTREME CAUTION ESPECIALLY DURING MAX EBB.

&&

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT MEANS THE POTENTIALLY DANGEROUS
CONDITIONS MAY EXIST ON SPECIFIC BEACHES. THESE HAZARDS MAY
INCLUDE LARGE SHORE BREAK...STRONG RIP CURRENTS...STRONG LONGSHORE
CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE LIFE
THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN.

&&

$$
1 follow-up statement
108 
WHUS46 KMTR 062156
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
156 PM PST SUN NOV 6 2016

CAZ006-505-509-529-530-062300-
/O.EXP.KMTR.BH.S.0018.000000T0000Z-161106T2200Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
156 PM PST SUN NOV 6 2016

...BEACH HAZARDS STATEMENT WILL EXPIRE AT 2 PM PST THIS
AFTERNOON...

LARGE WESTERLY SWELL THAT HAS BEEN IMPACTING THE COAST CONTINUES
TO SUBSIDE THIS AFTERNOON. THUS, HAZARDOUS CONDITIONS ALONG AREA
BEACHES WILL CONTINUE TO IMPROVE LATE THIS AFTERNOON AND EVENING.
HOWEVER, TO BE SAFE, NEVER TURN YOUR BACK ON THE OCEAN AS WAVES
CAN BE ERRATIC AND UNPREDICTABLE.

$$

Nearby

Beach Hazards Statements in California, 2016Every beach hazards statement in 2016

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.