Alert archive / California / Beach Hazards Statements in 2016

Beach Hazards Statement 9, NWS San Francisco Bay Area, CA

April 23, 20166 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Apr 23, 2016, 3:05 AM PDT for 6 counties in California. It took effect at Apr 23, 2016, 5:00 AM PDT. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued
Apr 23, 2016, 3:05 AM PDT (10:05 UTC)
In effect from
Apr 23, 2016, 5:00 AM PDT
Expired
Apr 23, 2016, 8:00 PM PDT
In force
15 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 10:06 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, 10.1 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 00:00Z on 2016-04-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 15 joules per kilogram.LCLLFCEL10008507005003002001001 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 2016-04-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 55 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
15 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
1294 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
55 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

559 
WHUS46 KMTR 231005
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
305 AM PDT SAT APR 23 2016

A MODERATE SIZED ENERGETIC WESTERLY SWELL WILL CONTINUE TO PASS
THROUGH THE COASTAL WATERS TODAY. WITH RELATIVELY LIGHT WINDS
PRESENT EARLY IN THE DAY THIS SWELL WILL RESULT IN GOOD SURF TODAY
WHICH WILL PROMOTE THE GENERATION OF STRONG RIP CURRENTS AND LARGE
SHORE BREAK AT AREA BEACHES. IF YOU PLAN ON SWIMMING IN THE OCEAN TODAY
PLEASE DO SO NEAR A LIFEGUARD.

CAZ006-505-509-529-530-240300-
/O.NEW.KMTR.BH.S.0009.160423T1200Z-160424T0300Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
305 AM PDT SAT APR 23 2016

...BEACH HAZARDS STATEMENT IN EFFECT THROUGH THIS EVENING...

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH
HAZARDS STATEMENT FOR STRONG RIP CURRENTS AND LARGE SHORE BREAK...WHICH
IS IN EFFECT THROUGH THIS EVENING.

* HAZARDS...STRONG RIP CURRENTS AND LARGE SHORE BREAK. 

* TIMING...THROUGH THIS EVENING. 

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

* POTENTIAL IMPACTS...STRONG RIP CURRENTS CAN PULL EVEN THE
  STRONGEST SWIMMERS AWAY FROM SHORE. LARGE SHORE BREAK CAN RESULT
  IN SERIOUS NECK AND BACK INJURIES.

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 LONG
SHORE CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE
LIFE THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 22, 9:30 PM PDTSmall Craft Advisory for Rough BarMTR21 hr
Apr 23, 2:56 AM PDTSmall Craft AdvisoryMTR42 hr
Apr 23, 2:56 AM PDTSmall Craft AdvisoryMTR4 days
Apr 23, 2:18 PM PDTGale WarningMTR55 hr

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.