Alert archive / California / Beach Hazards Statements in 2021
Beach Hazards Statement 5, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Mar 8, 2021, 8:17 AM PST for 6 counties in California. It was in force for 13 hr.
The area
The counties it named.
The facts
- Issued
- Mar 8, 2021, 8:17 AM PST (16:17 UTC)
- Expired
- Mar 8, 2021, 9:00 PM PST
- In force
- 13 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 16:19 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, 4.3 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
- -1 J/kg
- Mixed-layer LCL
- 996 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -24 m²/s²
- 0-3 km storm-relative helicity
- 54 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
767 WHUS46 KMTR 081617 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 817 AM PST Mon Mar 8 2021 ...Large Shore Break possible today with arriving NW Swell... .An arriving northwest swell train will bring the possibility of large shore break at non-sheltered coastlines through the this evening. Buoys report wave heights of up to three feet higher than modeled and it is expected that heights will remain elevated through midday. Consequently, hazardous conditions will exist at the coast, primarily large shore break, but also somewhat enhanced rip and long shore currents. CAZ006-505-509-530-090300- /O.NEW.KMTR.BH.S.0005.210308T1617Z-210309T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 817 AM PST Mon Mar 8 2021 ...BEACH HAZARDS STATEMENT IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Northwest swell of 13 to 16 feet at 14 to 16 seconds. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 7 PM PST this evening. * IMPACTS... Increased risk of hazardous large breaking waves in shallow water along unsheltered coastlines, stronger rip and longshore currents. * ADDITIONAL DETAILS...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. Be sure to always keep your eyes on the ocean. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
2 follow-up statements
899 WHUS46 KMTR 090248 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 648 PM PST Mon Mar 8 2021 ...Large Shore Break possible today with arriving NW Swell... .A northwest swell train will bring the possibility of large shore break at non-sheltered coastlines through this evening. Consequently, hazardous conditions will exist at the coast, primarily large shore break, but also somewhat enhanced rip and long shore currents. Latest buoy reports are showing that wave heights are beginning to lower, but will keep the Beach Hazard Statement out for a couple more hours to ensure that hazardous conditions have subsided. CAZ006-505-509-530-090500- /O.EXT.KMTR.BH.S.0005.000000T0000Z-210309T0500Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 648 PM PST Mon Mar 8 2021 ...BEACH HAZARDS STATEMENT NOW IN EFFECT UNTIL 9 PM PST THIS EVENING... * WHAT...Northwest swell of 11 to 15 feet at 14 to 16 seconds. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 9 PM PST this evening. * IMPACTS... Increased risk of hazardous large breaking waves in shallow water along unsheltered coastlines, stronger rip and longshore currents. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
844 WHUS46 KMTR 090446 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 846 PM PST Mon Mar 8 2021 CAZ006-505-509-530-090600- /O.EXP.KMTR.BH.S.0005.000000T0000Z-210309T0500Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 846 PM PST Mon Mar 8 2021 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 9 PM PST THIS EVENING... Latest radar imagery shows that much of the shower activity has diminished. There are still some moderate showers off the coast of Big Sur and just a few showers still over the waters between Pt Reyes and the San Francisco Peninsula. However, lightning activity has not been detected in the past hour and the remaining showers will be moving inland within the next hour or two. Another round of showers and thunderstorms are expected over the coastal waters through the day Tuesday. $$
Nearby
Beach Hazards Statements in California, 2021Every beach hazards statement in 2021
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.