Alert archive / California / Beach Hazards Statements in 2023
Beach Hazards Statement 13, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Oct 14, 2023, 11:13 PM PDT for 6 counties in California. It took effect at Oct 15, 2023, 5:00 AM PDT. It was in force for 21 hr.
The area
The counties it named.
The facts
- Issued
- Oct 14, 2023, 11:13 PM PDT (06:13 UTC)
- In effect from
- Oct 15, 2023, 5:00 AM PDT
- Expired
- Oct 16, 2023, 1:41 AM PDT
- In force
- 21 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 06:16 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, 6.2 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
- 822 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 77 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
060 WHUS46 KMTR 150613 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1113 PM PDT Sat Oct 14 2023 CAZ006-505-509-530-151415- /O.NEW.KMTR.BH.S.0013.231015T1200Z-231016T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 1113 PM PDT Sat Oct 14 2023 ...BEACH HAZARDS STATEMENT IN EFFECT FROM 5 AM PDT SUNDAY THROUGH LATE SUNDAY NIGHT... * WHAT...Increased threat of sneaker waves expected. * WHERE...West and northwest facing beaches including San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...From 5 AM PDT Sunday through late Sunday night. * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. Maximum surf height can reach 15 ft. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. Don't be fooled by an ocean that looks calm. There can be 30 minutes of small waves before a sneaker wave strikes. Avoid rocks and jetties. Avoid steep beaches. Stay much farther back from the water and never turn your back on the ocean. && $$
4 follow-up statements
731 WHUS46 KMTR 150652 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1152 PM PDT Sat Oct 14 2023 CAZ006-505-509-530-151500- /O.CON.KMTR.BH.S.0013.231015T1200Z-231016T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 1152 PM PDT Sat Oct 14 2023 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 5 AM PDT SUNDAY THROUGH LATE SUNDAY NIGHT... * WHAT...Increased threat of sneaker waves expected. * WHERE...West and northwest facing beaches including San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast Counties. * WHEN...From 5 AM PDT Sunday through late Sunday night. * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
050 WHUS46 KMTR 151209 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 509 AM PDT Sun Oct 15 2023 CAZ006-505-509-530-160330- /O.CON.KMTR.BH.S.0013.000000T0000Z-231016T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 509 AM PDT Sun Oct 15 2023 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH LATE TONIGHT... * WHAT...Increased threat of sneaker waves expected due to long period northwest swell. * WHERE...West and northwest facing beaches of coastal North Bay, San Francisco Peninsula Coast, San Mateo county coast, Southern Monterey Bay, and Big Sur coast. * WHEN...Through late tonight. * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. . PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. Don't be fooled by an ocean that looks calm. There can be 30 minutes of small waves before a sneaker wave strikes. Avoid rocks and jetties. Avoid steep beaches. Stay much farther back from the water and never turn your back on the ocean. && $$
505 WHUS46 KMTR 160322 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 822 PM PDT Sun Oct 15 2023 CAZ006-505-509-530-161200- /O.CON.KMTR.BH.S.0013.000000T0000Z-231016T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 822 PM PDT Sun Oct 15 2023 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 5 AM PDT MONDAY... * WHAT...Increased threat of sneaker waves expected due to long period northwest swell. * WHERE...West and northwest facing beaches of coastal North Bay, San Francisco Peninsula Coast, San Mateo county coast, Southern Monterey Bay, and Big Sur coast. * WHEN...Until 5 AM PDT Monday. * IMPACTS...Large, unexpected waves can sweep across the beach without warning, sweeping people into the sea from rocks, jetties, and beaches. These sneaker waves can also move large objects such as logs, crushing anyone caught underneath. . PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. Don't be fooled by an ocean that looks calm. There can be 30 minutes of small waves before a sneaker wave strikes. Avoid rocks and jetties. Avoid steep beaches. Stay much farther back from the water and never turn your back on the ocean. && $$
709 WHUS46 KMTR 160841 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 141 AM PDT Mon Oct 16 2023 CAZ006-505-509-530-160945- /O.CAN.KMTR.BH.S.0013.000000T0000Z-231016T1200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 141 AM PDT Mon Oct 16 2023 ...BEACH HAZARDS STATEMENT IS CANCELLED... Period of northwest swell has diminished to 16-17 seconds, so there is no longer an enhanced sneaker wave risk. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 15, 1:13 AM PDT | Dense Fog Advisory | MTR | Marin, Monterey, Napa, San Benito, City and County of San Francisco, San Mateo and 2 more | 9 hr |
| Oct 15, 1:22 AM PDT | Marine Dense Fog Advisory | MTR | 10 hr | |
| Oct 15, 2:24 AM PDT | Small Craft Advisory | MTR | 43 hr |
Nearby
Beach Hazards Statements in California, 2023Every beach hazards statement in 2023
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.