Alert archive / California / Beach Hazards Statements in 2020
Beach Hazards Statement 10, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Oct 30, 2020, 11:07 AM PDT for 6 counties in California. It took effect at Nov 1, 2020, 2:00 PM PST. It was in force for 27 hr.
The area
The counties it named.
The facts
- Issued
- Oct 30, 2020, 11:07 AM PDT (18:07 UTC)
- In effect from
- Nov 1, 2020, 2:00 PM PST
- Expired
- Nov 2, 2020, 5:00 PM PST
- In force
- 27 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 18:06 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, 6.1 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
- 2476 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 30 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
332 WHUS46 KMTR 301807 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1107 AM PDT Fri Oct 30 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large northwest swell will arrive Sunday afternoon and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. By Sunday evening into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-310400- /O.NEW.KMTR.BH.S.0010.201101T2200Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 1107 AM PDT Fri Oct 30 2020 ...BEACH HAZARDS STATEMENT IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... The National Weather Service in San Francisco has issued a Beach Hazards Statement for the risk of sneaker waves and rip currents, which is in effect from Sunday afternoon through Monday afternoon. * HAZARDS...Breaking waves from 6 to 9 feet, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...From 3 PM PDT Sunday afternoon through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. 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. Never turn your back on the ocean! && $$
7 follow-up statements
254 WHUS46 KMTR 310403 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 903 PM PDT Fri Oct 30 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell will arrive Sunday afternoon and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. By Sunday evening into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-311900- /O.CON.KMTR.BH.S.0010.201101T2200Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 903 PM PDT Fri Oct 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...From 3 PM PDT Sunday afternoon through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
420 WHUS46 KMTR 311832 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1132 AM PDT Sat Oct 31 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell will arrive Sunday afternoon and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. By Sunday evening into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-010400- /O.CON.KMTR.BH.S.0010.201101T2200Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 1132 AM PDT Sat Oct 31 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...From 3 PM PDT Sunday afternoon through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
570 WHUS46 KMTR 010223 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 723 PM PDT Sat Oct 31 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell will arrive Sunday afternoon and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. By Sunday evening into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-011600- /O.CON.KMTR.BH.S.0010.201101T2200Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 723 PM PDT Sat Oct 31 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...From 3 PM PDT Sunday afternoon through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
444 WHUS46 KMTR 011532 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 732 AM PST Sun Nov 1 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell will arrive Sunday afternoon and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. By Sunday evening into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-020500- /O.CON.KMTR.BH.S.0010.201101T2200Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 732 AM PST Sun Nov 1 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 2 PM PST THIS AFTERNOON THROUGH MONDAY AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...From 3 PM PDT Sunday afternoon through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
582 WHUS46 KMTR 020407 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 807 PM PST Sun Nov 1 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell will arrive tonight and impact the coastline through Monday afternoon before subsiding. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. Tonight into Monday morning, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected, with most favored northwest facing beaches at 10 to 12 feet. CAZ006-505-509-530-021600- /O.CON.KMTR.BH.S.0010.000000T0000Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 807 PM PST Sun Nov 1 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH MONDAY AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with beaches in most favored locations seeing breaks 10 to 12 feet with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...Through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
559 WHUS46 KMTR 021540 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 740 AM PST Mon Nov 2 2020 ...Sneaker waves and rip currents for northwest facing beaches from Coastal Sonoma County to Coastal Monterey County... .A large long period northwest swell is impacting the coastline through Monday afternoon before subsiding Monday night. Initial swell heights of 1 to 2 feet at 23 seconds is expected increasing the risk of sneaker waves. This morning through afternoon, wave heights of 6 to 9 feet at periods of 18 to 20 seconds are expected. CAZ006-505-509-530-030100- /O.CON.KMTR.BH.S.0010.000000T0000Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 740 AM PST Mon Nov 2 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 5 PM PST THIS AFTERNOON... * HAZARDS...Breaking waves from 6 to 9 feet with 18 to 20 second periods, with rip currents expected. With most beaches still fairly flat, extended run up is expected making it dangerous for beachgoers. * TIMING...Through 5 PM PST Monday afternoon. * 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...Marina State Beach...Monastery Beach. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. 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. Fisherman should avoid fishing from rocks or jetties. Listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
132 WHUS46 KMTR 030053 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 453 PM PST Mon Nov 2 2020 CAZ006-505-509-530-030200- /O.EXP.KMTR.BH.S.0010.000000T0000Z-201103T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 453 PM PST Mon Nov 2 2020 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 5 PM PST THIS AFTERNOON... The beach hazards statement will be allowed to expire at 5 pm. $$
Nearby
Beach Hazards Statements in California, 2020Every beach hazards statement in 2020
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.