Alert archive / California / Beach Hazards Statements in 2021
Beach Hazards Statement 6, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Mar 19, 2021, 3:38 AM PDT for 6 counties in California. It took effect at Mar 19, 2021, 10:00 AM PDT. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Mar 19, 2021, 3:38 AM PDT (10:38 UTC)
- In effect from
- Mar 19, 2021, 10:00 AM PDT
- Expired
- Mar 19, 2021, 10:00 PM PDT
- 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 10:41 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
Vandenberg AFB, CA (KVBG), launched 00:00Z, 10.6 hours before the alert went out and 349 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
- 1120 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
771 WHUS46 KMTR 191038 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 338 AM PDT Fri Mar 19 2021 ...Increasing risk of large breaking waves, strong rip currents and sneaker waves from late morning to this evening... .A large, moderate period northwest swell will arrive in our coastal waters later this morning and continue into late evening. Expect an increasing risk of large breaking waves, strong rip currents and sneaker waves by late morning into tonight. The hazard is for west to northwest facing beaches where caution is advised. Northwest swell will subside late tonight and Saturday. CAZ006-505-509-529-530-192100- /O.NEW.KMTR.BH.S.0006.210319T1700Z-210320T0600Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 338 AM PDT Fri Mar 19 2021 ...BEACH HAZARDS STATEMENT IN EFFECT FROM 10 AM PDT THIS MORNING TO 10 PM PDT THIS EVENING... * WHAT...Northwest swell 13 to 15 feet at 15 seconds expected. * WHERE...Coastal North Bay including the Point Reyes National Seashore, San Francisco, San Francisco Peninsula Coast, the Monterey Bay and the Big Sur Coast. * WHEN...From 10 AM PDT this morning to 10 PM PDT this evening. * IMPACTS...Increasing risk of large breaking waves, strong rip currents and sneaker waves. * ADDITIONAL DETAILS...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 large breaking waves, strong rip currents and sneaker waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
2 follow-up statements
648 WHUS46 KMTR 192053 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 153 PM PDT Fri Mar 19 2021 ...Increasing risk of large breaking waves, strong rip currents and sneaker waves through this evening... .A large, moderate period northwest swell will continue to build into the region through late this evening. Expect an increasing risk of large breaking waves, strong rip currents and sneaker waves through tonight. The hazard is for west to northwest facing beaches where caution is advised. Northwest swell will subside late tonight into Saturday. CAZ006-505-509-529-530-200500- /O.CON.KMTR.BH.S.0006.000000T0000Z-210320T0600Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 153 PM PDT Fri Mar 19 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... * WHAT...Northwest swell 13 to 15 feet at 15 seconds expected resulting in breaking waves of 18 to 24 feet. * WHERE...Coastal North Bay including the Point Reyes National Seashore, San Francisco, San Francisco Peninsula Coast, the Monterey Bay and the Big Sur Coast. * WHEN...From 10 AM PDT this morning to 10 PM PDT this evening. * IMPACTS...Increasing risk of large breaking waves, strong rip currents and sneaker waves. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
008 WHUS46 KMTR 200453 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 953 PM PDT Fri Mar 19 2021 CAZ006-505-509-529-530-200600- /O.EXT.KMTR.BH.S.0006.000000T0000Z-210320T0500Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 953 PM PDT Fri Mar 19 2021 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 10 PM PDT THIS EVENING... * Northwest swell will continue to subside this evening and no longer meets hazard criteria. && $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 19, 2:46 AM PDT | Small Craft Advisory | MTR | 42 hr | |
| Mar 19, 3:38 AM PDT | Areal Flood Advisory | MTR | Monterey | 112 min |
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.