Alert archive / California / Beach Hazards Statements in 2016

Beach Hazards Statement 21, NWS San Francisco Bay Area, CA

December 3, 20166 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Dec 3, 2016, 6:24 AM PST for 6 counties in California. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Dec 3, 2016, 6:24 AM PST (14:24 UTC)
Expired
Dec 3, 2016, 6:00 PM PST
In force
12 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 14:22 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, 2.4 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 12:00Z on 2016-12-03Temperature 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 2016-12-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 square meters per square second.1939587897Sfc1 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
2290 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
85 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

768 
WHUS46 KMTR 031424
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
624 AM PST SAT DEC 3 2016

LONG PERIOD WAVES ARE ARRIVING ALONG THE COAST. AT 6 AM THE HALF
MOON BAY BUOY AND MONTEREY BAY BUOY REPORT 10 FOOT NORTHWESTERLY
WAVES AT 20 SECOND PERIOD. THIS WILL PRODUCE LARGE BREAKERS ALONG
THE BEACHES WITH THE POTENTIAL FOR SNEAKER WAVES AND RIP CURRENTS.
WAVE PERIOD WILL DECREASE TO 17 TO 18 SECONDS LATER THIS MORNING
BUT WAVES MAY INCREASE SLIGHTLY. 

CAZ006-505-509-529-530-040200-
/O.NEW.KMTR.BH.S.0021.161203T1424Z-161204T0200Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
624 AM PST SAT DEC 3 2016

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 6 PM PST THIS
EVENING...

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH
HAZARDS STATEMENT FOR SNEAKER WAVES...WHICH IS IN EFFECT UNTIL 6
PM PST THIS EVENING.

* HAZARDS...LARGE LONG-PERIOD BREAKERS. 

* TIMING...THROUGH 6 PM.

* LOCATION...ALONG THE COAST FROM SONOMA COUNTY TO MONTEREY
  COUNTY.

* POTENTIAL IMPACTS...POTENTIAL FOR SNEAKER WAVES AND RIP
  CURRENTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT FOR 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
448 
WHUS46 KMTR 032221
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
221 PM PST SAT DEC 3 2016

.LONG PERIOD WAVES ARE ARRIVING AT AREA BEACHES. AT 2 PM THE HALF
MOON BAY BUOY AND MONTEREY BAY BUOY REPORTED 10 FOOT NORTHWESTERLY
SWELLS AT 19 SECOND PERIODS. THIS WILL PRODUCE LARGE BREAKERS
ALONG THE BEACHES WITH THE POTENTIAL FOR SNEAKER WAVES AND RIP
CURRENTS.

CAZ006-505-509-529-530-040200-
/O.CON.KMTR.BH.S.0021.000000T0000Z-161204T0200Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
221 PM PST SAT DEC 3 2016

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 6 PM PST THIS
EVENING...

* HAZARDS...LARGE LONG-PERIOD WAVES.

* TIMING...THROUGH 6 PM.

* LOCATION...ALONG THE COAST FROM SONOMA COUNTY TO MONTEREY 
  COUNTY. 

* POTENTIAL IMPACTS...POTENTIAL FOR SNEAKER WAVES...LARGE SHORE
  BREAK AND RIP CURRENTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT FOR 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.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 3, 3:03 AM PSTSmall Craft AdvisoryMTR4 days

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.