Alert archive / California / Beach Hazards Statements in 2021
Beach Hazards Statement 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Jan 14, 2021, 8:04 PM PST for Santa Cruz County, California. It took effect at Jan 15, 2021, 11:00 AM PST. It was in force for 32 hr.
The area
The counties it named.
The facts
- Issued
- Jan 14, 2021, 8:04 PM PST (04:04 UTC)
- In effect from
- Jan 15, 2021, 11:00 AM PST
- Expired
- Jan 16, 2021, 7:00 PM PST
- In force
- 32 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 04:04 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, 4.1 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
- 2224 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -61 m²/s²
- 0-3 km storm-relative helicity
- -34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
822 WHUS46 KMTR 150404 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 804 PM PST Thu Jan 14 2021 ...Large, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County 11 am Friday to 7 pm PST Saturday... .Large, long period northwest swell and strong rip currents will impact the coast from late Friday morning through early Saturday evening. Forerunner waves from 3 to 6 feet with swell periods of 20 to 22 seconds will arrive late Friday morning. Friday afternoon through Saturday morning expect swell heights of 15 to 17 feet with up to 19 feet breaking waves at favored breakpoints and swell periods of 18 to 20 seconds. Expect swell heights 15 to 17 feet with 16 second swell periods from early afternoon to early evening on Saturday. Additionally, hazardous long period swell, strong rip currents and sneaker waves will impact the northern Monterey Bay coastline from late Friday morning to early Saturday evening where a beach hazards statement is in effect. CAZ006-505-509-530-151400- /O.NEW.KMTR.SU.Y.0005.210115T1900Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 804 PM PST Thu Jan 14 2021 ...HIGH SURF ADVISORY IN EFFECT FROM 11 AM FRIDAY TO 7 PM PST SATURDAY... * WHAT...Forerunner waves from 3 to 6 feet with swell periods of 20 to 22 seconds will arrive late Friday morning. From Friday afternoon through Saturday morning expect swell heights of 15 to 17 feet with up to 19 feet breaking waves at favored breakpoints and swell periods of 18 to 20 seconds. Expect swell heights 15 to 17 feet with 16 second swell periods from early afternoon to early evening on Saturday. * 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 11 AM Friday to 7 PM PST Saturday. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents. Expect 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$ CAZ529-151400- /O.NEW.KMTR.BH.S.0001.210115T1900Z-210117T0300Z/ Northern Monterey Bay- 804 PM PST Thu Jan 14 2021 ...BEACH HAZARDS STATEMENT IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY EVENING... * WHAT...Forerunner waves from 2 to 3 feet with swell periods of 20 to 22 seconds will arrive late Friday morning. From Friday afternoon through Saturday morning expect swell heights of 7 to 12 feet and swell periods of 18 to 20 seconds. Expect swell heights 7 to 12 feet with diminishing swell periods to 16 seconds from early afternoon to early evening on Saturday. * WHERE...Northern Monterey Bay. * WHEN...From Friday morning through Saturday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
5 follow-up statements
193 WHUS46 KMTR 151238 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 438 AM PST Fri Jan 15 2021 ...Moderate, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County... .A moderate, long period northwest swell will arrive along the coastline today resulting in hazardous conditions in the surf zone. Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) can be expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect from late this morning through Saturday evening for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. CAZ006-505-509-530-152300- /O.CON.KMTR.SU.Y.0005.210115T1900Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 438 AM PST Fri Jan 15 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 7 PM PST SATURDAY... * WHAT...Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet 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 11 AM Friday to 7 PM PST Saturday. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents. Expect 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...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... 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. && $$ CAZ529-152300- /O.CON.KMTR.BH.S.0001.210115T1900Z-210117T0300Z/ Northern Monterey Bay- 438 AM PST Fri Jan 15 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 11 AM PST THIS MORNING THROUGH SATURDAY EVENING... * WHAT...Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, larger breaking waves will be possible, especially along any west to northwest facing beaches. * WHERE...Northern Monterey Bay. * WHEN...From Friday morning through Saturday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water due to dangerous surf conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
471 WHUS46 KMTR 152205 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 205 PM PST Fri Jan 15 2021 ...Moderate, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County... .A moderate, long period northwest swell will result in hazardous conditions in the surf zone. Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) can be expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect from late this morning through Saturday evening for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. A second, larger long period west to northwest swell will arrive Sunday and Monday. Continued vigilance is advised. CAZ006-505-509-530-160700- /O.CON.KMTR.SU.Y.0005.000000T0000Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 205 PM PST Fri Jan 15 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 7 PM PST SATURDAY... * WHAT...Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet 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 7 PM PST Saturday. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents. Expect 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...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... 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. && $$ CAZ529-160700- /O.CON.KMTR.BH.S.0001.000000T0000Z-210117T0300Z/ Northern Monterey Bay- 205 PM PST Fri Jan 15 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH SATURDAY EVENING... * WHAT....Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, larger breaking waves will be possible, especially along any west to northwest facing beaches. * WHERE...Northern Monterey Bay. * WHEN...Through Saturday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water due to dangerous surf conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
476 WHUS46 KMTR 160446 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 846 PM PST Fri Jan 15 2021 ...Moderate, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County... .A moderate, long period northwest swell will result in hazardous conditions in the surf zone. Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) can be expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect from late this morning through Saturday evening for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. A second, larger long period west to northwest swell will arrive Sunday and Monday. Continued vigilance is advised. CAZ006-505-509-530-161400- /O.CON.KMTR.SU.Y.0005.000000T0000Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 846 PM PST Fri Jan 15 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 7 PM PST SATURDAY... * WHAT...Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) can be expected along west to northwest facing beaches. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...Until 7 PM PST Saturday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Expect 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...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... 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. && $$ CAZ529-161400- /O.CON.KMTR.BH.S.0001.000000T0000Z-210117T0300Z/ Northern Monterey Bay- 846 PM PST Fri Jan 15 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH SATURDAY EVENING... * WHAT....Initial forerunners of 3 to 6 feet at 20 to 22 seconds will result in an increased risk of dangerous sneaker waves and rip currents today. As the northwest swell builds through tonight and into Saturday, larger breaking waves will be possible, especially along any west to northwest facing beaches. * WHERE...Northern Monterey Bay. * WHEN...Through Saturday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water to avoid hazardous swimming conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
156 WHUS46 KMTR 161127 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 327 AM PST Sat Jan 16 2021 ...Moderate, long period northwest swell resulting in hazardous conditions from coastal Sonoma County to coastal Monterey County... .A moderate, long period northwest swell will result in hazardous conditions in the surf zone through this evening. Swell heights are expected to build today with breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) expected along west to northwest facing beaches. As a result, a High Surf Advisory is in effect through Saturday evening for west and northwest facing beaches while a Beach Hazard Statement has been issued for the northern Monterey Bay including Santa Cruz. A second, larger long period west to northwest swell will arrive Sunday and Monday. Continued vigilance is advised. CAZ006-505-509-530-170300- /O.CON.KMTR.SU.Y.0005.000000T0000Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 327 AM PST Sat Jan 16 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 7 PM PST THIS EVENING... * WHAT...Breaking waves of 15 to 17 feet (locally up to 20 feet at favored breakpoints) can be expected along west to northwest facing beaches. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast and San Francisco. * WHEN...Until 7 PM PST Saturday. * IMPACTS...Dangerous swimming and surfing conditions and localized beach erosion. Expect 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...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... 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. && $$ CAZ529-170300- /O.CON.KMTR.BH.S.0001.000000T0000Z-210117T0300Z/ Northern Monterey Bay- 327 AM PST Sat Jan 16 2021 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THIS EVENING... * WHAT...Breaking waves 12 to 15 feet possible in favored break points. * WHERE...Northern Monterey Bay. * WHEN...Through Saturday evening. * IMPACTS...Dangerous swimming and surfing conditions with strong rip currents and sneaker waves. People are strongly urged to remain well back from the ocean as these types of events often result in an increase in cold water rescues and the loss of life. * ADDITIONAL DETAILS...While these waves are not as large as our previous events in the most recent days, unseasonable warm temperatures this holiday weekend will likely attract more people to the coast. Individuals should be reminded that our coastline and the cold Pacific waters remain dangerous as these larger than normal waves impact the coast. Extreme caution is advised when visiting area beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Remain out of the water to avoid hazardous swimming conditions. Rock jetties can be deadly in such conditions, stay off the rocks. && $$
537 WHUS46 KMTR 170241 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 641 PM PST Sat Jan 16 2021 CAZ006-505-509-530-170345- /O.EXP.KMTR.SU.Y.0005.000000T0000Z-210117T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 641 PM PST Sat Jan 16 2021 ...HIGH SURF ADVISORY WILL EXPIRE AT 7 PM PST THIS EVENING... Swell has reduced to 10-13 feet with a period of 15 seconds. Despite the reduced ocean conditions, the seas remain active. Though the advisory is allowed to expire, continued vigilance is advised. $$ CAZ529-170345- /O.EXP.KMTR.BH.S.0001.000000T0000Z-210117T0300Z/ Northern Monterey Bay- 641 PM PST Sat Jan 16 2021 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 7 PM PST THIS EVENING... Swell has reduced to 10-13 feet with a period of 15 seconds. Despite the reduced ocean conditions, the seas remain active. Though the advisory is allowed to expire, continued vigilance is advised. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 14, 8:04 PM PST | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 47 hr |
| Jan 15, 3:42 AM PST | High Wind Watch | MTR | 23 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.