Alert archive / California / Beach Hazards Statements in 2020
Beach Hazards Statement 13, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Dec 6, 2020, 3:38 AM PST for 6 counties in California. It took effect at Dec 7, 2020, 9:00 AM PST. It was in force for 22 hr.
The area
The counties it named.
The facts
- Issued
- Dec 6, 2020, 3:38 AM PST (11:38 UTC)
- In effect from
- Dec 7, 2020, 9:00 AM PST
- Expired
- Dec 8, 2020, 7:23 AM PST
- In force
- 22 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 11:41 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
Oakland, CA (KOAK), launched 00:00Z, 11.6 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
- 2284 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
630 WHUS46 KMTR 061138 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 338 AM PST Sun Dec 6 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST MONDAY THROUGH TUESDAY... .A strong storm system near the Aleutians is forecast to generate a very large, very long period northwest swell train that will arrive Monday before peaking Monday Night and Tuesday along the coast. For Monday, the primary hazard will be on the beaches where infrequent yet dangerous sneaker waves and stronger rip currents are expected. By Monday night, the swell heights are forecast to increase rapidly and the primary hazard will shift towards large breaking waves of roughly 25 feet at west and northwest facing beaches prompting dangerous conditions in the surf zone at west to northwest facing beaches. A beach hazard statement is in effect on Monday during the day for the sneaker wave threat while a high surf warning is in effect for Monday night through the day Tuesday for the large breaking waves expected. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-062300- /O.NEW.KMTR.SU.W.0001.201208T0100Z-201209T0100Z/ /O.NEW.KMTR.BH.S.0013.201207T1700Z-201208T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 338 AM PST Sun Dec 6 2020 ...BEACH HAZARDS STATEMENT IN EFFECT FROM MONDAY MORNING THROUGH MONDAY AFTERNOON... ...HIGH SURF WARNING IN EFFECT FROM 5 PM MONDAY TO 5 PM PST TUESDAY... * WHAT...For the Beach Hazards Statement, infrequent yet dangerous sneaker waves are expected on Monday. For the High Surf Warning, dangerously large breaking waves of 25 feet at west to northwest beaches Monday Night through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both Monday and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. Excludes the Northern Monterey Bay (including Santa Cruz) due to this area being sheltered from the northwest seas. * WHEN...For the Beach Hazards Statement, from Monday morning through Monday afternoon. For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and localized beach erosion can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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.Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. A High Surf Warning for large breaking waves means conditions are present to support large waves along the surf zone capable of sweeping people into the frigid and turbulent ocean water. 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. && $$
7 follow-up statements
150 WHUS46 KMTR 062207 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 207 PM PST Sun Dec 6 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST MONDAY THROUGH TUESDAY... .A strong storm system near the Aleutians is forecast to generate a very large, very long period northwest swell train that will arrive tomorrow before peaking tomorrow night and Tuesday along the coast. For tomorrow, the primary hazard will be on the beaches where infrequent yet dangerous sneaker waves and stronger rip currents are expected. By tomorrow night, the swell heights are forecast to increase rapidly and the primary hazard will shift towards large breaking waves of roughly 25 feet at west and northwest facing beaches prompting dangerous conditions in the surf zone at west to northwest facing beaches. A beach hazard statement is in effect on Monday during the day for the sneaker wave threat while a high surf warning is in effect for Monday night through the day Tuesday for the large breaking waves expected. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-070700- /O.CON.KMTR.SU.W.0001.201208T0100Z-201209T0100Z/ /O.CON.KMTR.BH.S.0013.201207T1700Z-201208T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 207 PM PST Sun Dec 6 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM MONDAY MORNING THROUGH MONDAY AFTERNOON... ...HIGH SURF WARNING REMAINS IN EFFECT FROM 5 PM MONDAY TO 5 PM PST TUESDAY... * WHAT...For the Beach Hazards Statement, infrequent yet dangerous sneaker waves are expected tomorrow. For the High Surf Warning, dangerously large breaking waves of 25 feet at west to northwest beaches tomorrow night through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both Monday and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. Excludes the Northern Monterey Bay (including Santa Cruz) due to this area being sheltered from the northwest seas. * WHEN...For the Beach Hazards Statement, from Monday morning through Monday afternoon. For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and localized beach erosion can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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.Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. A High Surf Warning for large breaking waves means conditions are present to support large waves along the surf zone capable of sweeping people into the frigid and turbulent ocean water. 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. && $$
751 WHUS46 KMTR 070458 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 858 PM PST Sun Dec 6 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST MONDAY THROUGH TUESDAY... .A very large, very long period northwest swell train that will arrive Monday before peaking tomorrow night and Tuesday along the coast. For tomorrow, the primary hazard will be on the beaches where infrequent yet dangerous sneaker waves and stronger rip currents are expected. By tomorrow night, the swell heights are forecast to increase rapidly and the primary hazard will shift towards large breaking waves of roughly 25 feet at west and northwest facing beaches prompting dangerous conditions in the surf zone at west to northwest facing beaches. A beach hazard statement is in effect on Monday during the day for the sneaker wave threat while a high surf warning is in effect for Monday night through the day Tuesday for the large breaking waves expected. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-071300- /O.CON.KMTR.SU.W.0001.201208T0100Z-201209T0100Z/ /O.CON.KMTR.BH.S.0013.201207T1700Z-201208T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 858 PM PST Sun Dec 6 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM MONDAY MORNING THROUGH MONDAY AFTERNOON... ...HIGH SURF WARNING REMAINS IN EFFECT FROM 5 PM MONDAY TO 5 PM PST TUESDAY... * WHAT...For the Beach Hazards Statement, infrequent yet dangerous sneaker waves are expected tomorrow. For the High Surf Warning, dangerously large breaking waves of 25 feet at west to northwest beaches tomorrow night through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both Monday and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. Excludes the Northern Monterey Bay (including Santa Cruz) due to this area being sheltered from the northwest seas. * WHEN...For the Beach Hazards Statement, from Monday morning through Monday afternoon. For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and localized beach erosion can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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.Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. A High Surf Warning for large breaking waves means conditions are present to support large waves along the surf zone capable of sweeping people into the frigid and turbulent ocean water. 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. && $$
603 WHUS46 KMTR 071046 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 246 AM PST Mon Dec 7 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST THROUGH TUESDAY... .A very large, very long period northwest swell train will arrive today and peak from tonight through Tuesday along the coast. For tomorrow, the primary hazard will be infrequent yet dangerous sneaker waves and stronger rip currents. By tonight, the swell heights are forecast to increase rapidly and the primary hazard will shift towards large breaking waves of roughly 25 feet at west and northwest facing beaches. A beach hazard statement is in effect during the day today for the sneaker wave threat while a high surf warning is in effect for Monday night through the day Tuesday for the large breaking waves. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-072315- /O.CON.KMTR.SU.W.0001.201208T0100Z-201209T0100Z/ /O.CON.KMTR.BH.S.0013.201207T1700Z-201208T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 246 AM PST Mon Dec 7 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 9 AM PST THIS MORNING THROUGH THIS AFTERNOON... ...HIGH SURF WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM PST TUESDAY... * WHAT...For the Beach Hazards Statement, infrequent yet dangerous sneaker waves are expected tomorrow. For the High Surf Warning, dangerously large breaking waves of 25 feet at west to northwest beaches tomorrow night through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both Monday and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. Excludes the Northern Monterey Bay (including Santa Cruz) due to this area being sheltered from the northwest seas. * WHEN...For the Beach Hazards Statement, from this morning through 5 PM PST this afternoon. For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and localized beach erosion can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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.Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. A High Surf Warning for large breaking waves means conditions are present to support large waves along the surf zone capable of sweeping people into the frigid and turbulent ocean water. 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. && $$
071 WHUS46 KMTR 071638 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 838 AM PST Mon Dec 7 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST THROUGH TUESDAY... .A very large, very long period northwest swell train will arrive today and peak from tonight through Tuesday along the coast. For today, the primary hazard will be infrequent yet dangerous sneaker waves and stronger rip currents. By tonight, the swell heights are forecast to increase rapidly and the primary hazard will shift towards large breaking waves of roughly 25 feet at west and northwest facing beaches. A Beach Hazard Statement is in effect during the day today for the sneaker wave threat while a High Surf Warning is in effect for Monday night through the day Tuesday for the large breaking waves. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-080100- /O.CON.KMTR.SU.W.0001.201208T0100Z-201209T0100Z/ /O.CON.KMTR.BH.S.0013.201207T1700Z-201208T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 838 AM PST Mon Dec 7 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 5 PM PST THIS AFTERNOON... ...HIGH SURF WARNING REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 5 PM PST TUESDAY... * WHAT...For the Beach Hazards Statement, infrequent yet dangerous sneaker waves are expected today. For the High Surf Warning, dangerously large breaking waves of 25 feet at west to northwest beaches tonight through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both today and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. The Northern Monterey Bay (including Santa Cruz) will face a lesser threat due to this area being sheltered from northwest seas, however, there will still be an increased risk of sneaker waves, rip currents, and larger wave runup. * WHEN...For the Beach Hazards Statement, from this morning through 5 PM PST this afternoon (For the Northern Monterey Bay will run through 5 PM PST Tuesday). For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions and localized beach erosion can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. A High Surf Warning for large breaking waves means conditions are present to support large waves along the surf zone capable of sweeping people into the frigid and turbulent ocean water. 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. && $$ CAZ529-080100- /O.EXB.KMTR.BH.S.0013.201207T1700Z-201209T0100Z/ Northern Monterey Bay- 838 AM PST Mon Dec 7 2020 ...BEACH HAZARDS STATEMENT IN EFFECT THROUGH TUESDAY AFTERNOON... * WHAT...Infrequent yet dangerous sneaker waves are expected with an increased risk of strong rip currents, increased wave runup, and occasionally large breaking waves. * WHERE...Northern Monterey Bay (including Santa Cruz). * WHEN...Through 5 PM PST Tuesday afternoon. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...Though typically more sheltered from northwest swell trains, the large nature of the upcoming swell will still increase the risk of dangerous sneaker waves and rip currents throughout the event. These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Fisherman should avoid fishing from rocks or jetties. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. && $$
091 WHUS46 KMTR 080127 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 527 PM PST Mon Dec 7 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST THROUGH TUESDAY... The expected very large, very long period northwest swell train has arrived and will peak from tonight through Tuesday along the coast. Swell heights are forecast to increase rapidly, and the primary hazard will be large breaking waves of roughly 25 feet at west and northwest facing beaches. A High Surf Warning is in effect tonight through the day Tuesday for the large breaking waves. For Northern Monterey Bay (including Santa Cruz), a Beach Hazard Statement remains in effect through Tuesday afternoon. Though typically more sheltered from northwest swell trains, the large nature of the upcoming swell will still increase the risk of dangerous sneaker waves and rip currents throughout the event. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-081200- /O.EXP.KMTR.BH.S.0013.000000T0000Z-201208T0100Z/ /O.CON.KMTR.SU.W.0001.000000T0000Z-201209T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 527 PM PST Mon Dec 7 2020 ...HIGH SURF WARNING IS NOW IN EFFECT UNTIL 5 PM PST TUESDAY... * WHAT...Dangerously large breaking waves of 25 feet at west to northwest beaches tonight through Tuesday. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected both today and Tuesday. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. The Northern Monterey Bay (including Santa Cruz) will face a lesser threat due to this area being sheltered from northwest seas, however, there will still be an increased risk of sneaker waves, rip currents, and larger wave runup. * WHEN...For the Beach Hazards Statement, from this morning through 5 PM PST this afternoon (For the Northern Monterey Bay will run through 5 PM PST Tuesday). For the High Surf Warning, from 5 PM Monday to 5 PM PST Tuesday. * IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening swimming conditions and significant beach erosion can be expected. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure. && $$ CAZ529-081200- /O.CON.KMTR.BH.S.0013.000000T0000Z-201209T0100Z/ Northern Monterey Bay- 527 PM PST Mon Dec 7 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH TUESDAY AFTERNOON... * WHAT...Infrequent yet dangerous sneaker waves are expected with an increased risk of strong rip currents, increased wave runup, and occasionally large breaking waves. * WHERE...Northern Monterey Bay (including Santa Cruz). * WHEN...Through 5 PM PST Tuesday afternoon. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...Though typically more sheltered from northwest swell trains, the large nature of the upcoming swell will still increase the risk of dangerous sneaker waves and rip currents throughout the event. These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Fisherman should avoid fishing from rocks or jetties. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. && $$
030 WHUS46 KMTR 081143 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 343 AM PST Tue Dec 8 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST TODAY... A very large, long period northwest swell train will peak through this morning along the coast. The primary hazard will be large breaking waves of roughly 25 feet at west and northwest facing beaches. A High Surf Warning is in effect until 5 PM PST today for the large breaking waves. For the Northern Monterey Bay including Santa Cruz, a Beach Hazard Statement remains in effect until 5 PM PST today. Though typically more sheltered from northwest swell trains, the large nature of the swell will increase the risk of dangerous sneaker waves and rip currents. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ006-505-509-530-082200- /O.CON.KMTR.SU.W.0001.000000T0000Z-201209T0100Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 343 AM PST Tue Dec 8 2020 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 5 PM PST THIS AFTERNOON... * WHAT...Dangerously large breaking waves of 25 feet at west to northwest beaches until 5 PM PST today. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected today. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. The Northern Monterey Bay including Santa Cruz will face a lesser threat due sheltering from northwest seas, however, there will still be an increased risk of sneaker waves, rip currents, and larger wave runup. * WHEN...The High Surf Warning is in effect until 5 PM PST today. * IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening swimming conditions and significant beach erosion can be expected. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure. && $$ CAZ529-082200- /O.CON.KMTR.BH.S.0013.000000T0000Z-201209T0100Z/ Northern Monterey Bay- 343 AM PST Tue Dec 8 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THIS AFTERNOON... * WHAT...Infrequent yet dangerous sneaker waves are expected with an increased risk of strong rip currents, increased wave runup, and occasionally large breaking waves. * WHERE...Northern Monterey Bay including Santa Cruz. * WHEN...The Beach Hazards Statement is in effect until 5 PM PST today. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...Though typically more sheltered from northwest swell trains, the large nature of the upcoming swell will still increase the risk of dangerous sneaker waves and rip currents throughout the event. These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Fisherman should avoid fishing from rocks or jetties. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. && $$
783 WHUS46 KMTR 081523 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 723 AM PST Tue Dec 8 2020 ...VERY LARGE, LONG PERIOD NORTHWEST SWELL WILL BRING HAZARDOUS CONDITIONS ALONG THE COAST THROUGH THE EVENING... A very large, long period northwest swell train will peak through this morning along the coast. The primary hazard will be large breaking waves of roughly 25 feet at west and northwest facing beaches, locally higher at favored break points. A High Surf Warning is in effect until 9 PM PST today for the large breaking waves. For the Northern Monterey Bay including Santa Cruz, the Beach Hazard Statement has been upgraded to a High Surf Advisory until 9 PM PST today. Though typically more sheltered from northwest swell trains, the large nature of the swell will increase the risk of dangerous sneaker waves and rip currents as well as bring large breaking waves into the surf zone. Cold water drownings occur each year with these type of events but are completely avoidable by remaining a safe distance from the coastline. If you must visit the coastline, avoid venturing out on coastal rocks, outcroppings, jetties, etc, and remain extremely vigilant of your surroundings at all times. CAZ529-090100- /O.CAN.KMTR.BH.S.0013.000000T0000Z-201209T0100Z/ /O.NEW.KMTR.SU.Y.0006.201208T1600Z-201209T0500Z/ Northern Monterey Bay- 723 AM PST Tue Dec 8 2020 ...HIGH SURF ADVISORY IN EFFECT UNTIL 9 PM PST THIS EVENING... ...BEACH HAZARDS STATEMENT IS CANCELED... * WHAT...Infrequent yet dangerous sneaker waves are expected with an increased risk of strong rip currents, increased wave runup, and large breaking waves. * WHERE...Northern Monterey Bay County including Santa Cruz. * WHEN...Until 9 PM PST this evening. * IMPACTS...Sneaker waves and large breaking waves can sweep people off jetties and docks, and into dangerous seas. Life- threatening swimming conditions can be expected. Cold water rescues or drownings are more likely with these waves and stronger rip currents. * ADDITIONAL INFO...Though typically more sheltered from northwest swell trains, the large nature of the upcoming swell will still increase the risk of dangerous sneaker waves and rip currents throughout the event. Large breaking waves are also expected. These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... A High Surf Advisory means that high surf will affect beaches in the advisory area, producing rip currents, localized beach erosion and sneaker waves. People walking along the beach should never turn their back to the sea. Fisherman should avoid fishing from rocks or jetties. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. && $$ CAZ006-505-509-530-090100- /O.EXT.KMTR.SU.W.0001.000000T0000Z-201209T0500Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 723 AM PST Tue Dec 8 2020 ...HIGH SURF WARNING NOW IN EFFECT UNTIL 9 PM PST THIS EVENING... * WHAT...Dangerously large breaking waves of 25 feet at west to northwest beaches, locally higher at favored breakpoints. Enhanced coastal run up, localized beach erosion, and stronger rip currents are expected today. * WHERE...Main threat will be at west to northwest facings beaches along the entire coastline from Sonoma county southward through Big Sur in Monterey county. The Northern Monterey Bay including Santa Cruz will face a lesser threat due sheltering from northwest seas, however, there will still be an increased risk of sneaker waves, rip currents, large breaking waves and larger wave runup. * WHEN...Until 9 PM PST this evening. * IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Life-threatening swimming conditions and significant beach erosion can be expected. * ADDITIONAL INFO...These types of events lead to cold water drownings each year so extreme vigilance is advised. PRECAUTIONARY/PREPAREDNESS ACTIONS... Everyone should remain out of the water due to life-threatening surf conditions. Stay off of jetties, piers, and other waterside infrastructure. && $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 6, 2:26 AM PST | Small Craft Advisory | MTR | 6 days | |
| Dec 6, 2:57 AM PST | Gale Warning | MTR | 32 hr | |
| Dec 6, 3:05 AM PST | Wind Advisory | MTR | Alameda, Contra Costa, Marin, Napa, City and County of San Francisco, San Mateo and 3 more | 32 hr |
| Dec 6, 3:18 AM PST | Red Flag Warning | MTR | Alameda, Contra Costa, Marin, Napa, San Mateo, Santa Clara and 2 more | 38 hr |
| Dec 6, 3:38 AM PST | High Surf Warning | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 65 hr |
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.