Alert archive / California / Beach Hazards Statements in 2017

Beach Hazards Statement 1, NWS San Francisco Bay Area, CA

January 14, 20176 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Jan 14, 2017, 2:21 PM PST for 6 counties in California. It was in force for 31 hr.

The area

The counties it named.

The facts

Issued
Jan 14, 2017, 2:21 PM PST (22:21 UTC)
Expired
Jan 15, 2017, 9:00 PM PST
In force
31 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 22:18 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, 10.4 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 2017-01-14Temperature 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 2017-01-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 51 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
1518 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
51 m²/s²
0-3 km storm-relative helicity
31 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

246 
WHUS46 KMTR 142221
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
221 PM PST SAT JAN 14 2017

...A LONG PERIOD NORTHWEST SWELL TRAIN WILL BRING HAZARDOUS BEACH
CONDITIONS THROUGH SUNDAY EVENING...

CAZ006-505-509-529-530-151500-
/O.NEW.KMTR.BH.S.0001.170114T2221Z-170116T0500Z/
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 JAN 14 2017

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

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

* HAZARDS...LARGE SHORE BREAK... RIP CURRENTS... SNEAKER WAVES.

* TIMING... FORERUNNERS WILL ARRIVE THROUGH SATURDAY AFTERNOON.
  LARGER WAVES WILL ARRIVE SATURDAY EVENING THROUGH SUNDAY. 

* 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...MODERATE RISK OF LARGE SHORE BREAK AND
  SNEAKER WAVES WITH AN INCREASED THREAT OF RIP CURRENTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT FOR LARGE SHORE BREAK MEANS THAT
CONDITIONS ARE PRESENT TO SUPPORT LARGE BREAKING WAVES IN SHALLOW
WATER. THESE LARGE BREAKING WAVES CAN LEAD TO BACK AND NECK
INJURIES. SWIMMERS SHOULD AVOID SWIMMING IN AREAS OF LARGE SHORE
BREAK AND ALWAYS SWIM NEAR A LIFEGUARD.

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.

A BEACH HAZARD STATEMENT FOR RIP CURRENTS MEANS THAT CONDITIONS
ARE PRESENT TO SUPPORT A HEIGHTENED RISK OF STRONG RIP CURRENTS.
RIP CURRENTS ARE TYPICALLY MORE FREQUENT AND STRONGER IN THE
VICINITY OF JETTIES...INLETS...AND PIERS. SWIMMERS CAUGHT IN A RIP
CURRENT SHOULD SWIM PARALLEL TO THE COAST TO ESCAPE THE RIP
CURRENT BEFORE TRYING TO SWIM FOR SHORE.

&&

$$
1 follow-up statement
328 
WHUS46 KMTR 151455
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
655 AM PST SUN JAN 15 2017

...A LONG PERIOD NORTHWEST SWELL TRAIN WILL BRING HAZARDOUS BEACH
CONDITIONS THROUGH SUNDAY EVENING...

CAZ006-505-509-529-530-160500-
/O.CON.KMTR.BH.S.0001.000000T0000Z-170116T0500Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
655 AM PST SUN JAN 15 2017

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

* HAZARDS...LARGE SHORE BREAK... RIP CURRENTS... SNEAKER WAVES.

* TIMING... FORERUNNERS WILL ARRIVE THROUGH SATURDAY AFTERNOON. 
  LARGER WAVES WILL ARRIVE SATURDAY EVENING THROUGH SUNDAY. 

* 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...MODERATE RISK OF LARGE SHORE BREAK AND 
  SNEAKER WAVES WITH AN INCREASED THREAT OF RIP CURRENTS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT FOR LARGE SHORE BREAK MEANS THAT
CONDITIONS ARE PRESENT TO SUPPORT LARGE BREAKING WAVES IN SHALLOW
WATER. THESE LARGE BREAKING WAVES CAN LEAD TO BACK AND NECK
INJURIES. SWIMMERS SHOULD AVOID SWIMMING IN AREAS OF LARGE SHORE
BREAK AND ALWAYS SWIM NEAR A LIFEGUARD.

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.

A BEACH HAZARD STATEMENT FOR RIP CURRENTS MEANS THAT CONDITIONS
ARE PRESENT TO SUPPORT A HEIGHTENED RISK OF STRONG RIP CURRENTS.
RIP CURRENTS ARE TYPICALLY MORE FREQUENT AND STRONGER IN THE
VICINITY OF JETTIES...INLETS...AND PIERS. SWIMMERS CAUGHT IN A
RIP CURRENT SHOULD SWIM PARALLEL TO THE COAST TO ESCAPE THE RIP
CURRENT BEFORE TRYING TO SWIM FOR SHORE.

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 14, 10:14 AM PSTMarine Dense Fog AdvisoryMTR106 min

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.