Alert archive / California / Beach Hazards Statements in 2017
Beach Hazards Statement 12, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Nov 27, 2017, 8:55 PM PST for 6 counties in California. It took effect at Nov 29, 2017, 9:00 AM PST. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Nov 27, 2017, 8:55 PM PST (04:55 UTC)
- In effect from
- Nov 29, 2017, 9:00 AM PST
- Expired
- Nov 29, 2017, 9:00 PM PST
- In force
- 12 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 05:01 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, 4.9 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1314 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -69 m²/s²
- 0-3 km storm-relative helicity
- -52 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
100 WHUS46 KMTR 280455 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 855 PM PST MON NOV 27 2017 A LARGE NORTHWEST SWELL IS FORECAST TO ARRIVE ALONG THE CALIFORNIA COAST ON WEDNESDAY. INITIALLY SWELL PERIOD WILL INCREASE TO 20 SECONDS WEDNESDAY MORNING THEN DECREASE TO ABOUT 18 SECONDS BY WEDNESDAY NIGHT. SWELLS HEIGHTS WILL SLOWLY BUILD DURING THE DAY WEDNESDAY PEAKING AT 10 TO 14 FEET. LARGE SURF CAN BE EXPECTED AS WELL AS SNEAKER WAVES AND RIP CURRENTS. CAZ006-505-509-529-530-290500- /O.NEW.KMTR.BH.S.0012.171129T1700Z-171130T0500Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 855 PM PST MON NOV 27 2017 ...BEACH HAZARDS STATEMENT IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH HAZARDS STATEMENT WHICH IS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING. * SEAS...NORTHWEST SWELLS 10 TO 14 FEET WITH A PERIOD OF 18-20 SECONDS. * TIMING...WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT * 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...LARGE SURF...SNEAKER WAVES...AND DANGEROUS RIP CURRENTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A BEACH HAZARD STATEMENT FOR LARGE SURF AND 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. && $$
2 follow-up statements
409 WHUS46 KMTR 290402 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 802 PM PST TUE NOV 28 2017 A LARGE NORTHWEST SWELL IS FORECAST TO ARRIVE ALONG THE CALIFORNIA COAST ON WEDNESDAY. INITIALLY SWELL PERIOD WILL INCREASE TO 20 SECONDS WEDNESDAY MORNING THEN DECREASE TO ABOUT 18 SECONDS BY WEDNESDAY NIGHT. SWELLS HEIGHTS WILL SLOWLY BUILD DURING THE DAY WEDNESDAY PEAKING AT 10 TO 14 FEET. LARGE SURF CAN BE EXPECTED AS WELL AS SNEAKER WAVES AND RIP CURRENTS. CAZ006-505-509-529-530-300500- /O.CON.KMTR.BH.S.0012.171129T1700Z-171130T0500Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 802 PM PST TUE NOV 28 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * SEAS...NORTHWEST SWELLS 10 TO 14 FEET WITH A PERIOD OF 18-20 SECONDS. * TIMING...WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT * LOCATION...COASTLINE FROM SONOMA COUNTY SOUTH THROUGH MONTEREY COUNTY. IN PARTICULAR WEST TO NORTHWEST FACING BEACHES... INCLUDING BUT NOT LIMITED TO...OCEAN BEACH...MONTARA STATE BEACH AND MARINA STATE BEACH. * POTENTIAL IMPACTS...LARGE SURF...SNEAKER WAVES...AND DANGEROUS RIP CURRENTS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A BEACH HAZARD STATEMENT FOR LARGE SURF AND SNEAKER WAVES MEANS THAT CONDITIONS ARE PRESENT TO SUPPORT A HEIGHTENED RISK OF UNSUSPECTING BEACH GOERS BEING SWEPT INTO THE SEA BY A WAVE. PEOPLE WALKING ALONG THE BEACH SHOULD NEVER TURN THEIR BACK TO THE SEA. FISHERMAN SHOULD AVOID FISHING FROM ROCKS OR JETTIES. && $$
183 WHUS46 KMTR 300524 CFWMTR COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA 924 PM PST WED NOV 29 2017 A LARGE NORTHWEST SWELL WILL CONTINUE TO IMPACT THE CALIFORNIA COAST THROUGH LATE TONIGHT. SWELL HEIGHTS OF 10 TO 18 FEET AT 15 TO 18 SECONDS CONTINUE TO BE OBSERVED THEREFORE THE BEACH HAZARD REMAINS IN EFFECT. LARGE SURF, SNEAKER WAVES AND RIP CURRENTS WILL PERSIST THROUGH LATE TONIGHT. CAZ006-505-509-529-530-301100- /O.EXP.KMTR.BH.S.0012.000000T0000Z-171130T0500Z/ /O.NEW.KMTR.BH.S.0013.171130T0524Z-171130T1100Z/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- SAN FRANCISCO PENINSULA COAST-NORTHERN MONTEREY BAY- SOUTHERN MONTEREY BAY AND BIG SUR COAST- 924 PM PST WED NOV 29 2017 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 3 AM PST THURSDAY... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A BEACH HAZARDS STATEMENT WHICH IS IN EFFECT UNTIL 3 AM PST THURSDAY. * SEAS...NORTHWEST SWELLS 10 TO 18 FEET WITH A PERIOD OF 15 TO 18 SECONDS. * TIMING...THROUGH EARLY THURSDAY MORNING * 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...LARGE SURF...SNEAKER WAVES...AND DANGEROUS RIP CURRENTS. A BEACH HAZARD STATEMENT FOR LARGE SURF AND 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. && $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 28, 2:56 AM PST | Small Craft Advisory for Rough Bar | MTR | 42 hr |
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.