Alert archive / California / High Surf Warnings in 2021
High Surf Warning 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this high surf warning at Oct 22, 2021, 2:18 PM PDT for 6 counties in California. It took effect at Oct 24, 2021, 11:00 PM PDT. It was in force for 36 hr. 18 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Oct 22, 2021, 2:18 PM PDT (21:18 UTC)
- In effect from
- Oct 24, 2021, 11:00 PM PDT
- Expired
- Oct 26, 2021, 11:00 AM PDT
- In force
- 36 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 21:22 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Oct 24, 11:34 PM PDT | FLOOD | 1 Wnw Interlaken - 172, CA | 3 FT DEEP WATER ON ROADWAY. |
| Oct 24, 11:35 PM PDT | FLOOD | 1 Nne Interlaken, CA | RDWY FLOODED 3 FT DEEP IN RDWY. |
| Oct 25, 1:15 AM PDT | FLOOD | Us101 N / Sala Rd, CA | / RDWY FLOODED REDUCE SPEED. |
| Oct 25, 3:13 AM PDT | FLOOD | 1 Se Redwood City, CA | STREET FLOODING/STANDING WATER ON MULTIPLE ROADS IN THE AREA AROUND CONVENTION WAY AND SB HWY 101. |
| Oct 25, 6:15 AM PDT | FLOOD | 4 Se Salinas, CA | HARTNELL RD AT ALISAL RD. VEHICLES STRANDED. |
| Oct 25, 6:28 AM PDT | FLOOD | 4 N Day Valley, CA | LARGE SECTION OF LOMA PRIETA WAY FLOODED FROM OVERNIGHT RAINFALL. |
| Oct 25, 6:45 AM PDT | FLOOD | 1 Sw King City, CA | STREET FLOODING ON US101 S AT BROADWAY ST. |
| Oct 25, 6:57 AM PDT | FLOOD | 2 Wnw Aromas, CA | VEHICLES STRANDED IN WATER/MUD. SAN JUAN RD NEAR MURPHY HILL RD. |
| Oct 25, 7:06 AM PDT | NON-TSTM WND DMG | 12 Wsw Carmel Valley Vi, CA | POWER LINES DOWN IN ROADWAY. PALO COLORADO RD AT STATE ROUTE 1. |
| Oct 25, 7:25 AM PDT | FLOOD | 2 Ene Lucas Valley-Mari, CA | STREET FLOODING. STANDING WATER ON ROADWAY. US101 N OFF-RAMP TO NAVE DR. |
| Oct 25, 7:30 AM PDT | FLOOD | 1 Ssw San Rafael, CA | STREET FLOODING. SB US101 FROM I-580 TO TAMALPAIS. |
| Oct 25, 7:30 AM PDT | NON-TSTM WND DMG | 3 Se Del Monte Forest, CA | TREE DOWN ON ROADWAY. OUTLOOK DRIVE. |
| Oct 25, 8:30 AM PDT | NON-TSTM WND DMG | Novato, CA | LARGE HARDWOOD TREE UPROOTED. BRANCHES DOWN AND MINOR STREET FLOODING. ALL WITHIN THE CITY OF NOVATO. RELAYED VIA SOCIAL MEDIA. |
| Oct 25, 8:40 AM PDT | NON-TSTM WND DMG | 4 W Glen Ellen, CA | TREE DOWN ON SONOMA MOUNTAIN RD BETWEEN SONOMA RIDGE AND ZACHARY LANE. |
| Oct 25, 9:00 AM PDT | DEBRIS FLOW | 19 S Carmel Valley Vill, CA | SB LANES OF HWY 1 CLOSED NEAR GRIMES CANYON IN THE BIG SUR AREA DUE TO A ROCKSLIDE. RELAYED VIA SOCIAL MEDIA. |
| Oct 25, 9:11 AM PDT | NON-TSTM WND DMG | 5 Ese Bodega Bay, CA | TREE DOWN BLOCKING ROADWAY. VALLEY FORD FRANKLIN SCHOOL RD SOUTH OF ESTERO RD. |
| Oct 25, 9:24 AM PDT | FLOOD | 3 Sw Windsor, CA | WATER ON ROADWAY. VEHICLE STRANDED. MARK WEST STATION RD AT STARR RD. |
| Oct 25, 2:10 PM PDT | NON-TSTM WND DMG | 1 Ene Elkhorn, CA | PINE TREE DOWN ACROSS ROADWAY ON PARADISE RD. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 9.3 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
- 644 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 177 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
145 WHUS46 KMTR 222118 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 218 PM PDT Fri Oct 22 2021 ...TWO SEPARATE PROGRESSIVELY LARGER SWELL TRAINS WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... .A pair of strong, early season storm systems will result in coastal hazards between today and next Tuesday. The first of these storm systems is impacting the region today and has already generated an area of heightened wave energy. Buoys along our coast has reported a modest uptick in wave height and period and cams show some of this increased energy now arriving at the coast. Large breaking waves of 15 to 20 feet, increased risk of longshore and rip currents, and enhanced coastal runup are all possible through the remainder of the day as this intermittent wave energy washes ashore, especially at west facing beaches. A high surf advisory is in effect until 11 PM this evening due to this threat. Then, a very strong atmospheric river storm system will move through the region late this weekend into early next week. Very large, long period swell is expected to be generated from this storm as it passes. This wave energy will then transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the largest swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-230600- /O.NEW.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ /O.CON.KMTR.SU.Y.0007.000000T0000Z-211023T0600Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 218 PM PDT Fri Oct 22 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING... ...HIGH SURF WARNING IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... * WHAT...For today's High Surf Advisory, intermittent large breaking waves of 15 to 20 feet, increased coastal run up, stronger rip currents and longshore currents. For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of coastal run up and minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Advisory, until 11 PM PDT this evening. For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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 DETAILS...Today's high surf advisory is for moderately large intermittent risks and should not downplay the expected risk arriving during the high surf warning. The high surf warning will see much stronger wave action and coastal threats, especially on Monday. 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. && $$
13 follow-up statements
685 WHUS46 KMTR 230558 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1058 PM PDT Fri Oct 22 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... .Strong, early season storm systems will result in coastal hazards returning next Tuesday. A very strong atmospheric river and storm system will move through the region late this weekend and early next week. Very large, long period swell will accompany this storm as it passes. This wave energy will transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the largest swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-231200- /O.EXP.KMTR.SU.Y.0007.000000T0000Z-211023T0600Z/ /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 1058 PM PDT Fri Oct 22 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... ...HIGH SURF ADVISORY WILL EXPIRE AT 11 PM PDT THIS EVENING... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of coastal run up and minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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 DETAILS...The high surf warning will bring strong wave action and coastal threats, especially on Monday. 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. && $$
725 WHUS46 KMTR 230602 AAA CFWMTR Coastal Hazard Message...UPDATED National Weather Service San Francisco CA 1102 PM PDT Fri Oct 22 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... .Strong, early season storm systems will result in coastal hazards returning late in the weekend and early next week. A very strong atmospheric river and storm system will move through the region late this weekend and early next week. Very large, long period swell will accompany this storm as it passes. This wave energy will transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the largest swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-231200- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 1102 PM PDT Fri Oct 22 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of coastal run up and minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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 DETAILS...The high surf warning will bring strong wave action and coastal threats, especially on Monday. 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. && $$
465 WHUS46 KMTR 231148 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 448 AM PDT Sat Oct 23 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... .Strong, early season storm systems will result in coastal hazards returning late in the weekend and early next week. A very strong atmospheric river and storm system will move through the region late this weekend and early next week. Very large, long period swell will accompany this storm as it passes. This wave energy will transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the largest swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-232200- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 448 AM PDT Sat Oct 23 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of coastal run up and minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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 DETAILS...The high surf warning will bring strong wave action and coastal threats, especially on Monday. 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. && $$
734 WHUS46 KMTR 231927 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1227 PM PDT Sat Oct 23 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... .A strong, early season storm system arrives tomorrow and will result in significantly increased wave energy from late Sunday into early Tuesday as it arrives and after it passes. This wave energy will transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-240500- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 1227 PM PDT Sat Oct 23 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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. 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. && $$
645 WHUS46 KMTR 240406 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 906 PM PDT Sat Oct 23 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... A strong, early season storm system arrives tomorrow and will result in significantly increased wave energy from late Sunday into early Tuesday as it arrives and after it passes. This wave energy will transition through the coastal waters from late Sunday into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-241300- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 906 PM PDT Sat Oct 23 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM SUNDAY TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM Sunday to 11 AM PDT 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. 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. && $$
781 WHUS46 KMTR 241125 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 425 AM PDT Sun Oct 24 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... A strong, early season storm system arrives today and will result in significantly increased wave energy from late today into early Tuesday. This wave energy will transition through the coastal waters from late today into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-242200- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 425 AM PDT Sun Oct 24 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...For the High Surf Warning, from 11 PM this evening to 11 AM PDT 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. 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. && $$
101 WHUS46 KMTR 242046 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 146 PM PDT Sun Oct 24 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... A strong, early season storm system arrives today and will result in significantly increased wave energy from late today into early Tuesday. This wave energy will transition through the coastal waters from late today into Tuesday, and peak on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-250500- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 146 PM PDT Sun Oct 24 2021 ...HIGH SURF WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...From 11 PM this evening to 11 AM PDT 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. 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. && $$
629 WHUS46 KMTR 250412 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 912 PM PDT Sun Oct 24 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... Astrong storm has been impacting the area tonight and will result in significantly increased wave energy from tonight into early Tuesday. This wave energy will transition through the coastal waters starting tonight into Tuesday, and peaking on Monday. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-251300- /O.CON.KMTR.SU.W.0002.211025T0600Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 912 PM PDT Sun Oct 24 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...From 11 PM tonight to 11 AM PDT 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. 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. && $$
313 WHUS46 KMTR 251004 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 304 AM PDT Mon Oct 25 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... A strong storm has been impacting the area and will continue to significantly increase wave energy into early Tuesday. This wave energy will transition through the coastal waters and peak this afternoon. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and is in effect from 11PM Sunday to 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-252100- /O.CON.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 304 AM PDT Mon Oct 25 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Coastal North Bay Including Point Reyes National Seashore, Southern Monterey Bay and Big Sur Coast, San Francisco Peninsula Coast, San Francisco and Northern Monterey Bay. * WHEN...Until 11 AM PDT 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. 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. && $$
887 WHUS46 KMTR 252102 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 202 PM PDT Mon Oct 25 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... A strong storm has been impacting the area and will continue to significantly increase wave energy into early Tuesday. This wave energy will transition through the coastal waters and peak this afternoon. Swell of 16 to 24 feet at 16 to 18 seconds is forecast to arrive with the swell train as it peaks on Monday and result in a number of coastal hazards. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and remains in effect until 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-260515- /O.CON.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 202 PM PDT Mon Oct 25 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...Until 11 AM PDT 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. 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. && $$
067 WHUS46 KMTR 260458 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 958 PM PDT Mon Oct 25 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... Significantly stronger swells are currently impacting the waters. Swell of 16 to 24 feet at 16 to 18 seconds has been impacting the coast. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Due to the early arrival of these large waves, many beaches are still transitioning from their summer beach profiles and lack the features and steepness to resist larger wave run up on coasts. This means that more of this wave energy will have a chance to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and remains in effect until 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. CAZ006-505-509-529-530-261300- /O.CON.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 958 PM PDT Mon Oct 25 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT TUESDAY... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...Until 11 AM PDT 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. 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. && $$
389 WHUS46 KMTR 260914 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 214 AM PDT Tue Oct 26 2021 ...A VERY LARGE SWELL TRAIN WILL BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... Significantly stronger swells are impacting the waters this morning. Swell of 16 to 24 feet at 16 to 18 seconds has been impacting the coast. These hazards include large breaking waves of 20 to 30 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion and minor coastal flooding, and enhanced coastal run up concerns due to the summer beach profiles in place. Wave energy has the potential to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. A high surf warning for the entire coast has been issued for this threat and remains in effect until 11AM Tuesday, with the highest risks once again at west to northwest facing beaches. While waves are expected to gradually fall below critically hazardous criteria by late morning, be sure to continue to be cautious during the remainder of the day as swells take time to lose their intensity. CAZ006-505-509-529-530-261800- /O.CON.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 214 AM PDT Tue Oct 26 2021 ...HIGH SURF WARNING REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... * WHAT...For the High Surf Warning, dangerously large breaking waves of 20 to 30 feet, greatly increased coastal run up, strong rip currents and longshore currents, and increased risk of minor coastal flooding in low lying areas. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...Until 11 AM PDT 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. 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. && $$
772 WHUS46 KMTR 261741 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 1041 AM PDT Tue Oct 26 2021 ...A LARGE SWELL TRAIN WILL CONTINUE TO BRING COASTAL HAZARDS TO WEST TO NORTHWEST FACING BEACHES... Although swell heights and periods have begun to subside, coastal buoys still report swell heights of 15 to 16 feet at 14 to 16 seconds. This will continue to generate hazardous beach conditions the rest of the day. These hazards include large breaking waves of 18 to 24 feet (higher at favored break points), increased risk of strong longshore and rip currents, increased risk of coastal erosion, and enhanced coastal run up concerns due to the summer beach profiles in place. Wave energy has the potential to move onto the beach and overtake individuals, potentially injuring them, or pulling them into the cold ocean. Each year, people die at the coast due to these or similar ocean conditions. The high surf warning will be allowed to expire at 11AM Tuesday, however, a high surf advisory will then take effect until 8 PM Tuesday evening. The highest risks once again for west to northwest facing beaches. Waves will subside this evening and overnight. CAZ006-505-509-529-530-270300- /O.EXP.KMTR.SU.W.0002.000000T0000Z-211026T1800Z/ /O.NEW.KMTR.SU.Y.0008.211026T1800Z-211027T0300Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 1041 AM PDT Tue Oct 26 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 8 PM PDT THIS EVENING... ...HIGH SURF WARNING WILL EXPIRE AT 11 AM PDT THIS MORNING... * WHAT...Large breaking waves of 18 to 24 feet, increased coastal run up, strong rip currents, and longshore currents.. * WHERE...Entire Pacific Coast from Sonoma to Monterey county. Highest risk at west to northwest facing beaches, including but not limited to: Ocean Beach, Montara State Beach, Half Moon Bay State Beach, Manresa State Beach, and Marina State Beach. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Breaking waves can sweep people off jetties and docks, and into dangerous seas. Dangerous swimming and surfing conditions and localized beach erosion. PRECAUTIONARY/PREPAREDNESS ACTIONS... Inexperienced swimmers should remain out of the water due to dangerous surf conditions. && $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 22, 10:48 AM PDT | Flash Flood Watch | MTR | Marin, Monterey, Napa, San Mateo, Santa Clara, Santa Cruz and 1 more | 65 hr |
| Oct 22, 12:56 PM PDT | High Surf Advisory | MTR | Marin, Monterey, City and County of San Francisco, San Mateo, Santa Cruz, Sonoma | 10 hr |
| Oct 22, 1:38 PM PDT | Wind Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 57 hr |
Nearby
High Surf Warnings in California, 2021Every high surf warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.