Alert archive / California / Beach Hazards Statements in 2021
Beach Hazards Statement 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Jan 16, 2021, 7:08 PM PST for Santa Cruz County, California. It took effect at Jan 17, 2021, 6:00 AM PST. It was in force for 36 hr.
The area
The counties it named.
The facts
- Issued
- Jan 16, 2021, 7:08 PM PST (03:08 UTC)
- In effect from
- Jan 17, 2021, 6:00 AM PST
- Expired
- Jan 18, 2021, 6:00 PM PST
- In force
- 36 hr
- Issued by
- NWS San Francisco Bay Area, CA
County Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 18 km from the middle of the area, began a volume at 03:09 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, 3.1 hours before the alert went out and 80 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
- 1964 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 45 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
643 WHUS46 KMTR 170308 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 708 PM PST Sat Jan 16 2021 ...A large, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County... .A large, long period northwest swell arrives on Sunday morning and will result in hazardous conditions in the surf zone through Monday afternoon. Forerunners are expected to arrive at 3 to 7 feet with a period of 22 to 24 seconds, increasing the risk of sneaker waves. Swell heights are then expected to build through Sunday with breaking waves of 18 to 22 feet, locally higher at favored breakpoints, expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through Monday afternoon for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. With warm temperatures present over a holiday weekend, continuous vigilance is advised. Never turn your back to the ocean. CAZ006-505-509-530-171400- /O.NEW.KMTR.SU.Y.0006.210117T1400Z-210118T2300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 708 PM PST Sat Jan 16 2021 ...HIGH SURF ADVISORY IN EFFECT FROM 6 AM SUNDAY TO 3 PM PST MONDAY... * WHAT...Large breaking waves of 18 to 22 feet, locally higher at favored breakpoints, can be expected along west to northwest facing beaches.. * 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 6 AM Sunday to 3 PM PST Monday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...Unseasonably warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches.. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. Use extra caution near the surf zone as these large waves will be 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. && $$ CAZ529-171400- /O.NEW.KMTR.BH.S.0002.210117T1400Z-210118T2300Z/ Northern Monterey Bay- 708 PM PST Sat Jan 16 2021 ...BEACH HAZARDS STATEMENT IN EFFECT FROM 6 AM PST SUNDAY THROUGH MONDAY AFTERNOON... * WHAT...Breaking waves 12 to 15 feet possible in favored break points. * WHERE...Northern Monterey Bay. * WHEN...From 6 AM PST Sunday through Monday afternoon. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water to avoid hazardous swimming conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
5 follow-up statements
146 WHUS46 KMTR 171010 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 210 AM PST Sun Jan 17 2021 ...A large, very long period northwest swell will result in hazardous beach conditions along the coast... .A large, very long period northwest swell will arrive Sunday morning and result in hazardous conditions along the coast through Monday afternoon. Forerunners are expected to arrive at 3 to 7 feet with a period of 22 to 24 seconds, increasing the risk of sneaker waves. Swell heights are then expected to build through Sunday with breaking waves of 18 to 22 feet, locally higher at favored breakpoints, expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through Monday afternoon for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. With warm temperatures present over a holiday weekend, continuous vigilance is advised. Never turn your back to the ocean. CAZ006-505-509-530-172300- /O.CON.KMTR.SU.Y.0006.210117T1400Z-210118T2300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 210 AM PST Sun Jan 17 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 6 AM THIS MORNING TO 3 PM PST MONDAY... * WHAT...Initially on Sunday, very long period forerunners will increase the risk of sneaker waves and rip currents. Building swell will then bring large breaking waves of 18 to 22 feet, locally higher at favored breakpoints, can be expected along west to northwest facing beaches. * 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 6 AM Sunday to 3 PM PST Monday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...Unseasonably warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. Use extra caution near the surf zone as these large waves will be 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. && $$ CAZ529-172300- /O.CON.KMTR.BH.S.0002.210117T1400Z-210118T2300Z/ Northern Monterey Bay- 210 AM PST Sun Jan 17 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 6 AM PST THIS MORNING THROUGH MONDAY AFTERNOON... * WHAT...An increased risk of sneaker waves Sunday morning. Then building swell will bring breaking waves 12 to 15 feet at favored break points. * WHERE...Northern Monterey Bay. * WHEN...From 6 AM PST Sunday through Monday afternoon. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water to avoid hazardous swimming conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
712 WHUS46 KMTR 172202 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 202 PM PST Sun Jan 17 2021 ...A large, very long period northwest swell will result in hazardous beach conditions along the coast... .A large, very long period northwest swell will result in hazardous conditions along the coast through Monday afternoon. Forerunners are expected at 3 to 7 feet with a period of 22 to 24 seconds, increasing the risk of sneaker waves. Swell heights are then expected to build into Monday with breaking waves of 18 to 22 feet, locally higher at favored breakpoints, expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through Monday afternoon for west and northwest facing beaches while a Beach Hazard Statement is in effect for the northern Monterey Bay including Santa Cruz. With warm temperatures present over a holiday weekend, continuous vigilance is advised. Never turn your back to the ocean. CAZ006-505-509-530-180700- /O.CON.KMTR.SU.Y.0006.000000T0000Z-210118T2300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 202 PM PST Sun Jan 17 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 3 PM PST MONDAY... * WHAT...Initially, very long period forerunners will increase the risk of sneaker waves and rip currents. Building swell will then bring large breaking waves of 18 to 22 feet, locally higher at favored breakpoints, can be expected along west to northwest facing beaches. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 3 PM PST Monday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...Unseasonably warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. Use extra caution near the surf zone as these large waves will be 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. && $$ CAZ529-180700- /O.CON.KMTR.BH.S.0002.000000T0000Z-210118T2300Z/ Northern Monterey Bay- 202 PM PST Sun Jan 17 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH MONDAY AFTERNOON... * WHAT...An increased risk of sneaker waves into Sunday night. Then building swell will bring breaking waves 12 to 15 feet at favored break points. * WHERE...Northern Monterey Bay. * WHEN...Through Monday afternoon. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water to avoid hazardous swimming conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
170 WHUS46 KMTR 180627 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1027 PM PST Sun Jan 17 2021 ...A large, very long period northwest swell will result in hazardous beach conditions along the coast... A large, very long period northwest swell has arrived to the coastal waters, creating hazardous conditions along the coast through Monday afternoon. Large swell heights are expected to continue into Monday with breaking waves of 18 to 22 feet, locally higher at favored breakpoints, along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through this afternoon for west and northwest facing beaches while a Beach Hazard Statement is in effect for the northern Monterey Bay including Santa Cruz. With warm temperatures present over a holiday weekend, continuous vigilance is advised. Never turn your back to the ocean. CAZ006-505-509-530-181100- /O.CON.KMTR.SU.Y.0006.000000T0000Z-210118T2300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 1027 PM PST Sun Jan 17 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 3 PM PST MONDAY... * WHAT...Large breaking waves of 18 to 22 feet, locally higher at favored breakpoints, can be expected along west to northwest facing beaches.. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 3 PM PST Monday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...Unseasonably warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$ CAZ529-181100- /O.CON.KMTR.BH.S.0002.000000T0000Z-210118T2300Z/ Northern Monterey Bay- 1027 PM PST Sun Jan 17 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH MONDAY AFTERNOON... * WHAT...Building swell will bring breaking waves 12 to 15 feet at favored break points.. * WHERE...Northern Monterey Bay. * WHEN...Through 3 P.M. Monday afternoon. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as in our most recent events, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
168 WHUS46 KMTR 181004 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 204 AM PST Mon Jan 18 2021 ...A large, very long period northwest swell will result in hazardous beach conditions along the coast... A large, very long period northwest swell has arrived to the coastal waters, creating hazardous conditions along the coast through the day today. Large swell heights are expected with breaking waves of 18 to 22 feet, locally higher at favored breakpoints, along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through this afternoon for west and northwest facing beaches while a Beach Hazard Statement is in effect for the northern Monterey Bay including Santa Cruz. With warm temperatures present over a holiday weekend, continuous vigilance is advised. Never turn your back to the ocean. CAZ006-505-509-530-190200- /O.EXT.KMTR.SU.Y.0006.000000T0000Z-210119T0200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 204 AM PST Mon Jan 18 2021 ...HIGH SURF ADVISORY NOW IN EFFECT UNTIL 6 PM PST THIS EVENING... * WHAT...Large breaking waves of 18 to 22 feet, locally higher at favored breakpoints, can be expected along west to northwest facing beaches. * WHERE...San Francisco, Coastal North Bay Including Point Reyes National Seashore, San Francisco Peninsula Coast and Southern Monterey Bay and Big Sur Coast. * WHEN...Until 6 PM PST this evening. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...Unseasonably warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$ CAZ529-190200- /O.EXT.KMTR.BH.S.0002.000000T0000Z-210119T0200Z/ Northern Monterey Bay- 204 AM PST Mon Jan 18 2021 ...BEACH HAZARDS STATEMENT NOW IN EFFECT UNTIL 6 PM THIS EVENING... * WHAT...Building swell will bring breaking waves 12 to 15 feet at favored break points. * WHERE...Northern Monterey Bay. * WHEN...Until 6 PM PST Monday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as in our most recent events, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
013 WHUS46 KMTR 190150 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 550 PM PST Mon Jan 18 2021 CAZ006-505-509-530-190300- /O.EXP.KMTR.SU.Y.0006.000000T0000Z-210119T0200Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 550 PM PST Mon Jan 18 2021 ...HIGH SURF ADVISORY WILL EXPIRE AT 6 PM PST THIS EVENING... Wave heights are slowly diminishing as the period reduces to 15 to 17 seconds. The advisory is allowed to expire since the waves are subsiding; however, the ocean remains very active. Continued vigilance and caution along the California coast is advised. $$ CAZ529-190300- /O.EXP.KMTR.BH.S.0002.000000T0000Z-210119T0200Z/ Northern Monterey Bay- 550 PM PST Mon Jan 18 2021 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 6 PM PST THIS EVENING... Wave heights are slowly diminishing as the period reduces to 14 to 16 seconds. The beach hazard statement is allowed to expire since the waves are subsiding; however, the ocean remains very active. Continued vigilance and caution along the California coast is advised. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 16, 7:08 PM PST | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 47 hr |
| Jan 17, 2:18 AM PST | Gale Warning | MTR | 60 hr | |
| Jan 17, 2:18 AM PST | Small Craft Advisory | MTR | 43 hr | |
| Jan 17, 12:25 PM PST | Fire Weather Watch | MTR | Monterey, San Benito | 21 hr |
| Jan 17, 1:39 PM PST | High Wind Warning | MTR | Monterey, San Mateo, Santa Clara, Santa Cruz | 44 hr |
| Jan 17, 2:13 PM PST | Gale Watch | MTR | 12 hr |
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.