Alert archive / California / Beach Hazards Statements in 2016

Beach Hazards Statement 10, NWS San Francisco Bay Area, CA

April 30, 20166 counties in California

NWS San Francisco Bay Area, CA issued this beach hazards statement at Apr 30, 2016, 12:10 PM PDT for 6 counties in California. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Apr 30, 2016, 12:10 PM PDT (19:10 UTC)
Expired
Apr 30, 2016, 9:00 PM PDT
In force
9 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 19:07 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, 7.2 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 2016-04-30Temperature 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 2016-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 107 square meters per square second.1939587897117Sfc1 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
2079 m above ground
0-6 km bulk shear
86 kt
0-1 km storm-relative helicity
107 m²/s²
0-3 km storm-relative helicity
179 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

374 
WHUS46 KMTR 301910
CFWMTR

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
1210 PM PDT SAT APR 30 2016

TODAY'S MODERATE TO STRONG NORTHERLY WINDS THAT ARE BLOWING OVER
THE COASTAL WATERS HAVE GENERATED MODERATE SIZE LOCAL WAVES. THESE
WAVES ARE CAPABLE OF PRODUCING STRONG RIP CURRENTS...STRONG LONG
SHORE CURRENTS AND LARGE SHORE BREAK. BEACH OBSERVATIONS PROVIDED
BY LOCAL LIFEGUARDS INDICATE THAT THESE HAZARDS ARE CURRENTLY
OCCURRING AT AREA BEACHES.
 
CAZ006-505-509-529-530-010400-
/O.NEW.KMTR.BH.S.0010.160430T1910Z-160501T0400Z/
SAN FRANCISCO-
COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE-
SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY-
SOUTHERN MONTEREY BAY AND BIG SUR COAST-
1210 PM PDT SAT APR 30 2016

...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 9 PM PDT THIS
EVENING...

THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH
HAZARDS STATEMENT FOR STRONG RIP CURRENTS...LARGE SHORE BREAK AND
STRONG LONG SHORE CURRENTS...WHICH IS IN EFFECT UNTIL 9 PM PDT
THIS EVENING.

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

* TIMING...THROUGH THIS EVENING. 

* LOCATION...THE COASTLINE FROM SONOMA THROUGH MONTEREY COUNTY.  

* POTENTIAL IMPACTS...STRONG RIP CURRENTS CAN PULL EVEN THE MOST
  EXPERIENCED SWIMMERS OUT TO SEA. LARGE SHORE BREAK CAN RESULT IN
  NECK AND BACK INJURIES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARD STATEMENT MEANS THAT POTENTIALLY DANGEROUS
CONDITIONS MAY EXIST ON SPECIFIC BEACHES. THESE HAZARDS MAY
INCLUDE LARGE SHORE BREAK...STRONG RIP CURRENTS...STRONG LONG
SHORECURRENTS 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 29, 9:06 PM PDTSmall Craft AdvisoryMTR24 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.