Alert archive / California / Beach Hazards Statements in 2017
Beach Hazards Statement 10, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Oct 20, 2017, 1:01 PM PDT for 6 counties in California. It took effect at Oct 20, 2017, 6:00 PM PDT. It was in force for 27 hr.
The area
The counties it named.
The facts
- Issued
- Oct 20, 2017, 1:01 PM PDT (20:01 UTC)
- In effect from
- Oct 20, 2017, 6:00 PM PDT
- Expired
- Oct 21, 2017, 9:00 PM PDT
- In force
- 27 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 20:03 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, 8.0 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.
- Mixed-layer CAPE
- 2 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 720 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 50 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
024 WHUS46 KMTR 202001 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 101 PM PDT FRI OCT 20 2017 ...HIGH SURF EXPECTED THROUGH THIS EVENING WITH CONTINUED BEACH HAZARDS THROUGH SATURDAY... .A LARGE NORTHWEST SWELL OF 15 TO 18 FEET WITH PERIODS OF 15 TO 18 SECONDS PEAKED FRIDAY MORNING AND IS TAPERING OFF THROUGH THE REMAINDER OF THE DAY. THIS SWELL WILL RESULT IN BREAKING WAVES OF GENERALLY AROUND 15 FEET, OCCASIONALLY 20 TO 25 FEET AT FAVORED LOCATIONS. THESE CONDITIONS WILL POSE A THREAT TO BEACHGOERS AND MARINERS TRAVERSING HARBOR ENTRANCES LATE THIS WEEK. THE HIGH SURF ADVISORY WILL EXPIRE AT 6PM BUT BE REPLACED BY A BEACH HAZARD STATEMENTS AS THE SEAS GRADUALLY SUBSIDE. CAZ006-505-509-529-530-210115- /O.NEW.KMTR.BH.S.0010.171021T0100Z-171022T0400Z/ /O.CON.KMTR.SU.Y.0007.000000T0000Z-171021T0100Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 101 PM PDT FRI OCT 20 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING... ...BEACH HAZARDS STATEMENT IN EFFECT FROM 6 PM PDT THIS EVENING THROUGH SATURDAY EVENING... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH HAZARDS STATEMENT FOR SNEAKER WAVES, LARGE SHORE BREAK, AND INCREASED RISK OF RIP CURRENTS WHICH IS IN EFFECT FROM 6 PM PDT THIS EVENING THROUGH SATURDAY EVENING. * WAVES AND SURF...BREAKING WAVES OF AROUND 15 FEET, OCCASIONALLY UP TO 25 FEET, WITH PERIODS OF 15 TO 18 SECONDS. FOR SATURDAY... BREAKING WAVES OF 8 TO 13 FEET WITH PERIODS OF 13 TO 15 SECONDS. * TIMING...WAVES PEAKING FRI MORNING... TAPERING OFF LATER FRI... WITH CONTINUED BEACH HAZARDS FRIDAY NIGHT THROUGH SATURDAY. * 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. * IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR OR HARBOR ENTRANCES ARE ALSO URGED TO EXERCISE EXTREME CAUTION...OR STAY IN PORT UNTIL THE THREAT SUBSIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA...PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. 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 LONGSHORE CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE LIFE THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN. && $$
4 follow-up statements
905 WHUS46 KMTR 210100 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 600 PM PDT FRI OCT 20 2017 ...HIGH SURF ADVISORY EXPIRES AT 6 PM AND WILL BE REPLACED WITH A BEACH HAZARDS STATEMENT THROUGH SATURDAY EVENING... .A LARGE NORTHWEST SWELL OF 15 TO 18 FEET WITH PERIODS OF 15 TO 18 SECONDS PEAKED EARLIER TODAY AND WILL CONTINUE TO TAPER OFF THROUGH THE OVERNIGHT HOURS. THIS SWELL WILL RESULT IN BREAKING WAVES OF GENERALLY AROUND 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. THESE CONDITIONS WILL POSE A THREAT TO BEACHGOERS AND MARINERS TRAVERSING HARBOR ENTRANCES THROUGH SATURDAY EVENING. CAZ006-505-509-529-530-210900- /O.EXP.KMTR.SU.Y.0007.000000T0000Z-171021T0100Z/ /O.CON.KMTR.BH.S.0010.000000T0000Z-171022T0400Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 600 PM PDT FRI OCT 20 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH SATURDAY EVENING... ...HIGH SURF ADVISORY WILL EXPIRE AT 6 PM PDT THIS EVENING... * SEAS...A NORTHWESTERLY SWELL OF 12 TO 15 FT AT 15 TO 17 SECONDS WILL CONTINUE TO CREATE HAZARDOUS BEACH CONDITIONS. BREAKING WAVES MAY REACH UP TO 20 FEET AT FAVORED LOCATIONS. * TIMING...THROUGH SATURDAY EVENING. WAVES ALREADY PEAKED EARLIER FRIDAY AND WILL CONTINUE TO DIMINISH OVERNIGHT AND INTO SATURDAY. WAVES OF GENERALLY AROUND 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. * 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. LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR OR HARBOR ENTRANCES ARE ALSO URGED TO EXERCISE EXTREME CAUTION...OR STAY IN PORT UNTIL THE THREAT SUBSIDES. && 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 LONGSHORE CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE LIFE THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN. && $$
980 WHUS46 KMTR 210544 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 1044 PM PDT FRI OCT 20 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH SATURDAY EVENING... .NORTHWEST SWELLS OF 12 TO 15 FEET WITH PERIODS OF 15 TO 17 SECONDS WILL CONTINUE THROUGH THE COASTAL WATERS THROUGH SATURDAY EVENING. THIS SWELL WILL RESULT IN BREAKING WAVES GENERALLY AROUND 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. WAVES HEIGHTS WILL GRADUALLY DIMINISH THROUGH THE DAY ON SATURDAY. THESE CONDITIONS WILL POSE A THREAT TO BEACHGOERS AND MARINERS TRAVERSING HARBOR ENTRANCES THROUGH SATURDAY EVENING. CAZ006-505-509-529-530-211800- /O.CON.KMTR.BH.S.0010.000000T0000Z-171022T0400Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 1044 PM PDT FRI OCT 20 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH SATURDAY EVENING... * SEAS...A NORTHWESTERLY SWELL OF 12 TO 15 FT AT 15 TO 17 SECONDS WILL CONTINUE TO CREATE HAZARDOUS BEACH CONDITIONS. BREAKING WAVES MAY REACH UP TO 20 FEET AT FAVORED LOCATIONS. * TIMING...THROUGH SATURDAY EVENING. WAVES ALREADY PEAKED EARLIER FRIDAY AND WILL CONTINUE TO GRADUALLY DIMINISH INTO SATURDAY. WAVES WILL GENERALLY BE 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. * 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...INCREASED RISK OF RIP CURRENTS, SNEAKER WAVES, AND LOCALLY LARGE SURF BREAK. BEACHGOERS MAY BE KNOCKED OVER, INJURED, OR PULLED OUT TO SEA INTO THE COLD, RESTLESS OCEAN. 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 LONGSHORE CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE LIFE- THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN. && $$
908 WHUS46 KMTR 211615 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 915 AM PDT SAT OCT 21 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH 9PM SATURDAY EVENING... .NORTHWEST SWELLS OF 12 TO 15 FEET WITH PERIODS OF 14 TO 16 SECONDS WILL CONTINUE THROUGH THE COASTAL WATERS THROUGH SATURDAY EVENING. THIS SWELL WILL RESULT IN BREAKING WAVES GENERALLY AROUND 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. WAVES HEIGHTS WILL GRADUALLY DIMINISH THROUGH THE DAY ON SATURDAY. THESE CONDITIONS WILL POSE A THREAT TO BEACHGOERS AND MARINERS TRAVERSING HARBOR ENTRANCES THROUGH SATURDAY EVENING. CAZ006-505-509-529-530-220400- /O.CON.KMTR.BH.S.0010.000000T0000Z-171022T0400Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 915 AM PDT SAT OCT 21 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 9 PM PDT THIS EVENING... * SEAS...A NORTHWESTERLY SWELL OF 12 TO 15 FT AT 14 TO 16 SECONDS WILL CONTINUE TO CREATE HAZARDOUS BEACH CONDITIONS. BREAKING WAVES MAY REACH UP TO 20 FEET AT FAVORED LOCATIONS. * TIMING...THROUGH SATURDAY EVENING. WAVES ALREADY PEAKED EARLIER FRIDAY AND WILL CONTINUE TO GRADUALLY DIMINISH INTO SATURDAY. WAVES WILL GENERALLY BE 12 TO 15 FEET, OCCASIONALLY REACHING UP TO 20 FEET AT FAVORED LOCATIONS. * 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...INCREASED RISK OF RIP CURRENTS, SNEAKER WAVES, AND LOCALLY LARGE SURF BREAK. BEACHGOERS MAY BE KNOCKED OVER, INJURED, OR PULLED OUT TO SEA INTO THE COLD, RESTLESS OCEAN. 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 LONGSHORE CURRENTS AND POSSIBLY SNEAKER WAVES. ALL OF WHICH COULD BE LIFE- THREATENING. BE SURE TO ALWAYS KEEP YOUR EYES ON THE OCEAN. && $$
822 WHUS46 KMTR 220343 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 843 PM PDT SAT OCT 21 2017 CAZ006-505-509-529-530-220445- /O.EXP.KMTR.BH.S.0010.000000T0000Z-171022T0400Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 843 PM PDT SAT OCT 21 2017 ...BEACH HAZARDS STATEMENT WILL BE ALLOWED TO EXPIRE AT 9 PM PDT THIS EVENING... NORTHWESTERLY SWELL PERIODS WILL GRADUALLY DECREASE THROUGH SUNDAY NIGHT. LOCALLY DANGEROUS RIP CURRENTS ARE STILL POSSIBLE TONIGHT, HOWEVER THE RISK OF RIP CURRENTS WILL BE ON THE DECREASE AS SWELL PERIODS DECREASE THROUGH SUNDAY NIGHT. OF COURSE IT'S ALWAYS PRUDENT TO USE EXTRA CARE WHENEVER VENTURING CLOSE TO THE OCEAN'S EDGE. && $$
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.