Alert archive / California / Beach Hazards Statements in 2014

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

December 24, 20146 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Dec 24, 2014, 8:03 AM PST for 6 counties in California. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Dec 24, 2014, 8:03 AM PST (16:03 UTC)
Expired
Dec 24, 2014, 6:00 PM PST
In force
10 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 16:02 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, 4.1 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 12:00Z on 2014-12-24Temperature 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 2014-12-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.19395878Sfc1 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
893 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

346 
WHUS46 KMTR 241603
CFWMTR

URGENT - IMMEDIATE BROADCAST REQUESTED
COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA
803 AM PST WED DEC 24 2014

...OCCASIONALLY LARGE SURF EXPECTED TODAY PLEASE USE CAUTION WHEN
VISITING BEACHES...

.AN APPROACHING STORM IS GENERATING POWERFUL LONG PERIOD SWELL THAT
WILL IMPACT REGIONAL BEACHES TODAY. IN ADDITION...THE TIDAL CYCLE
WILL REMAIN EXAGGERATED WHICH WILL RESULT IN HIGHER HIGH TIDES.
EXPECT UNPREDICTABLE SNEAKER WAVES...RIP CURRENTS...AND LIMITED
ACCESS TO NARROW BEACHES AND COVES TODAY. PEOPLE VISITING BEACHES
TODAY ARE URGED TO REMAIN VIGILANT OF THEIR SURROUNDINGS. LARGE
SNEAKER WAVES CAN APPEAR AT ANY TIME SO DO NOT TURN YOUR BACK TO
THE OCEAN IF YOU ARE NEAR THE WATER.

CAZ006-505-509-529-530-250200-
/O.NEW.KMTR.BH.S.0018.141224T1603Z-141225T0200Z/
SAN FRANCISCO-
COASTAL NORTH BAY...INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
803 AM PST WED DEC 24 2014

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

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

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

* TIMING... NOW THROUGH AN HOUR AFTER SUNSET.

* IMPACTS... SNEAKER WAVES. RIP CURRENTS. A POTENTIAL FOR PEOPLE
  TO LOSE ENTRY AND EXIT TO NARROW BEACHES AND COVES.

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.

PLEASE VISIT THE FOLLOWING WEBSITE TO SHARE YOUR THOUGHTS ON THE
NEW BEACH HAZARDS STATEMENT...

HTTP://WWW.WEATHER.GOV/SURVEY/NWS-SURVEY.PHP?CODE=CHMBHS.

&&

$$


HTTP://WWW.WEATHER.GOV/SANFRANCISCO

Nearby

Beach Hazards Statements in California, 2014Every beach hazards statement in 2014

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.