Alert archive / California / Beach Hazards Statements in 2021
Beach Hazards Statement 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Mar 3, 2021, 2:10 PM PST for 6 counties in California. It took effect at Mar 4, 2021, 3:00 AM PST. It was in force for 24 hr.
The area
The counties it named.
The facts
- Issued
- Mar 3, 2021, 2:10 PM PST (22:10 UTC)
- In effect from
- Mar 4, 2021, 3:00 AM PST
- Expired
- Mar 5, 2021, 3:00 AM PST
- In force
- 24 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 22:10 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, 10.2 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2159 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
803 WHUS46 KMTR 032210 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 210 PM PST Wed Mar 3 2021 ...INCREASED RISK OF SNEAKER WAVES AND DANGEROUS CURRENTS ON THURSDAY... .Long period northwest swell will arrive Thursday morning and will bring an increased risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. There is the potential that these conditions will transition into high surf on Friday. CAZ006-505-509-530-040615- /O.NEW.KMTR.BH.S.0004.210304T1100Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 210 PM PST Wed Mar 3 2021 ...BEACH HAZARDS STATEMENT IN EFFECT FROM LATE TONIGHT THROUGH LATE THURSDAY NIGHT... * WHAT...Long period northwest swell of 8 to 11 feet at 16 to 17 seconds expected. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...From late tonight through late Thursday night. * IMPACTS...Increased risk of sneaker waves and stronger rip currents and/or long shore currents. * ADDITIONAL DETAILS...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. Avoid fishing from rocks or jetties. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
5 follow-up statements
060 WHUS46 KMTR 040447 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 847 PM PST Wed Mar 3 2021 ...INCREASED RISK OF SNEAKER WAVES AND DANGEROUS CURRENTS ON THURSDAY... .Thursday morning has a new long period northwest swell arriving that will bring an increased risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. There is the potential that these conditions will transition into high surf on Friday. The hazard is for west and northwest facing beaches where caution is advised. Never turn your back to the ocean. CAZ006-505-509-530-041330- /O.CON.KMTR.BH.S.0004.210304T1100Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 847 PM PST Wed Mar 3 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 3 AM PST THURSDAY THROUGH LATE THURSDAY NIGHT... * WHAT...Long period northwest swell of 8 to 11 feet at 16 to 17 seconds expected. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...From 3 AM PST Thursday through late Thursday night. * IMPACTS...Increased risk of sneaker waves and stronger rip currents and/or long shore currents. * ADDITIONAL DETAILS...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. Avoid fishing from rocks or jetties. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. && $$
374 WHUS46 KMTR 041324 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 524 AM PST Thu Mar 4 2021 ...INCREASING RISK OF SNEAKER WAVES AND DANGEROUS CURRENTS TODAY THROUGH LATE TONIGHT... .A new long period northwest swell arrives today through Friday that will bring an increasing risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. There is the potential that these conditions will transition into high surf on Friday. The hazard is for west and northwest facing beaches where caution is advised. Never turn your back to the ocean. CAZ006-505-509-530-042200- /O.CON.KMTR.BH.S.0004.000000T0000Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 524 AM PST Thu Mar 4 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE TONIGHT... * WHAT...Long period northwest swell of 8 to 11 feet at 16 to 17 seconds expected. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...From 3 AM PST today through late tonight. * IMPACTS...Increased risk of sneaker waves and stronger rip currents and/or long shore currents. * ADDITIONAL DETAILS...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. Avoid fishing from rocks or jetties. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. && $$
735 WHUS46 KMTR 042157 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 157 PM PST Thu Mar 4 2021 ...INCREASING RISK OF SNEAKER WAVES AND DANGEROUS CURRENTS TODAY THROUGH LATE TONIGHT... .A long period northwest swell arrives this afternoon continuing through Friday that will bring an increased risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. The hazard is for west and northwest facing beaches where caution is advised. Never turn your back to the ocean. CAZ006-505-509-530-051100- /O.CON.KMTR.BH.S.0004.000000T0000Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 157 PM PST Thu Mar 4 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE TONIGHT... * WHAT...Long period northwest swell of 8 to 11 feet at 16 to 17 seconds expected. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...From 3 AM PST today through late tonight. * IMPACTS...Increased risk of sneaker waves and stronger rip currents and/or long shore currents. * ADDITIONAL DETAILS...A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Avoid fishing from rocks or jetties. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
027 WHUS46 KMTR 050420 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 820 PM PST Thu Mar 4 2021 ...INCREASING RISK OF SNEAKER WAVES AND DANGEROUS CURRENTS TODAY THROUGH LATE TONIGHT... .As the long period northwest continues to move southward through Friday, it will bring an increased risk of sneaker waves, rip currents, long shore currents, and there could be hard breaking surf on steep beaches. The hazard is for west and northwest facing beaches where caution is advised. Never turn your back to the ocean. CAZ006-505-509-530-051100- /O.CON.KMTR.BH.S.0004.000000T0000Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 820 PM PST Thu Mar 4 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 3 AM PST FRIDAY... * WHAT...Long period northwest swell of 8 to 11 feet at 16 to 17 seconds expected * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...Until 3 AM PST Friday. * IMPACTS...Increased risk of sneaker waves and stronger rip currents and/or long shore currents. * ADDITIONAL DETAILS...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. Avoid fishing from rocks or jetties. The coastal waters remain cold. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. The surf zone will be dangerous due to strong currents and powerful breaking waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
987 WHUS46 KMTR 051053 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 253 AM PST Fri Mar 5 2021 CAZ006-505-509-530-051200- /O.EXP.KMTR.BH.S.0004.000000T0000Z-210305T1100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 253 AM PST Fri Mar 5 2021 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 3 AM PST EARLY THIS MORNING... The long period northwest swell will continue to subside. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 3, 2:26 AM PST | Small Craft Advisory | MTR | 8 days |
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.