Alert archive / California / Beach Hazards Statements in 2020
Beach Hazards Statement 11, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this beach hazards statement at Nov 29, 2020, 5:59 AM PST for 6 counties in California. It took effect at Nov 30, 2020, 10:00 AM PST. It was in force for 24 hr.
The area
The counties it named.
The facts
- Issued
- Nov 29, 2020, 5:59 AM PST (13:59 UTC)
- In effect from
- Nov 30, 2020, 10:00 AM PST
- Expired
- Dec 1, 2020, 10:00 AM PST
- In force
- 24 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 14:03 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 2.0 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
- 2410 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- -17 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
289 WHUS46 KMTR 291359 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 559 AM PST Sun Nov 29 2020 ...Sneaker waves and strong rip currents for west and northwest facing beaches from coastal Sonoma County to coastal Monterey County Monday into Tuesday... .A long period northwest swell will arrive late Monday morning and impact the coastline through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves Monday. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning before subsiding late Tuesday morning. CAZ006-505-509-529-530-300500- /O.NEW.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 559 AM PST Sun Nov 29 2020 ...BEACH HAZARDS STATEMENT IN EFFECT FROM 10 AM PST MONDAY MORNING THROUGH 10 AM PST TUESDAY MORNING... * HAZARDS...Breaking waves initially from 7 to 9 feet at 19 seconds Monday, then breaks from 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning. * TIMING...10 AM PST Monday to 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Beach Hazard Statement for sneaker waves means that conditions are present to support a heightened risk of unsuspecting beach goers being swept into the sea by a wave. People walking along the beach should never turn their back to the sea. Fisherman should avoid fishing from rocks or jetties. A Beach Hazard Statement for rip currents means that conditions are present to support a heightened risk of strong rip currents. Rip currents are typically more frequent and stronger in the vicinity of jetties...inlets...and piers. Swimmers caught in a rip current should swim parallel to the coast to escape the rip current before trying to swim for shore. Swimmers should always swim near a lifeguard. Please listen to NOAA Weather Radio or your local media for the latest updates on this situation. && $$
6 follow-up statements
301 WHUS46 KMTR 292113 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 113 PM PST Sun Nov 29 2020 ...Sneaker waves and strong rip currents for west and northwest facing beaches from coastal Sonoma County to coastal Monterey County Monday into Tuesday... .A long period northwest swell will arrive late Monday morning and impact the coastline through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves Monday. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning before subsiding late Tuesday morning. An even longer period northwest swell will arrive Wednesday resulting in an even greater risk of these hazards. CAZ006-505-509-529-530-300500- /O.CON.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 113 PM PST Sun Nov 29 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY MORNING... * HAZARDS...Increased risk of sneaker waves and rip currents, especially along the west and northwest facing beaches. Additionally, breaking waves initially from 7 to 9 feet at 19 seconds Monday, then breaks from 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning. * TIMING...10 AM PST Monday to 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. * ADDITIONAL DETAILS...An even longer period northwest swell will arrive Wednesday and continue through Thursday producing an even greater risk for sneaker waves and rip currents. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
972 WHUS46 KMTR 300454 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 854 PM PST Sun Nov 29 2020 ...Sneaker waves and strong rip currents for west and northwest facing beaches from coastal Sonoma County to coastal Monterey County Monday into Tuesday... .A long period northwest swell will arrive late Monday morning and impact the coastline through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves Monday. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning before subsiding late Tuesday morning. An even longer period northwest swell will arrive Wednesday resulting in an even greater risk of these hazards. CAZ006-505-509-529-530-301100- /O.CON.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 854 PM PST Sun Nov 29 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM MONDAY MORNING THROUGH TUESDAY MORNING... * HAZARDS...Increased risk of sneaker waves and rip currents, especially along the west and northwest facing beaches. Additionally, breaking waves initially from 7 to 9 feet at 19 seconds Monday, then breaks from 9 to 11 feet at 17 seconds to 18 seconds Monday night and early Tuesday morning. * TIMING...10 AM PST Monday to 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. * ADDITIONAL DETAILS...An even longer period northwest swell will arrive Wednesday and continue through Thursday producing an even greater risk for sneaker waves and rip currents. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
179 WHUS46 KMTR 300940 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 140 AM PST Mon Nov 30 2020 ...Sneaker waves and strong rip currents for west and northwest facing beaches from coastal Sonoma County to coastal Monterey County today into Tuesday... .A long period northwest swell will arrive later this morning and impact the coastline through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves today. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds tonight and early Tuesday morning before subsiding late Tuesday morning. An even longer period northwest swell will arrive Wednesday resulting in an even greater risk of these hazards. CAZ006-505-509-529-530-010500- /O.CON.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast-Northern Monterey Bay- Southern Monterey Bay and Big Sur Coast- 140 AM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 10 AM PST THIS MORNING THROUGH 10 AM PST TUESDAY MORNING... * HAZARDS...Increased risk of sneaker waves and rip currents, especially along the west and northwest facing beaches. Additionally, breaking waves initially from 7 to 9 feet at 19 seconds today, then breaks from 9 to 11 feet at 17 seconds to 18 seconds tonight and early Tuesday morning. * TIMING...10 AM PST today to 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. * ADDITIONAL DETAILS...An even longer period northwest swell will arrive Wednesday and continue through Thursday producing an even greater risk for sneaker waves and rip currents. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
279 WHUS46 KMTR 301729 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 929 AM PST Mon Nov 30 2020 ...Enhanced Risk of Sneaker waves and rip currents for west and northwest facing beaches Late Monday Morning into Tuesday... .A long period northwest swell arrives this morning and will impact the coastline through late Tuesday morning before subsiding. Initial swell heights of 7 to 9 feet at 19 seconds will increase the risk of sneaker waves today. Swell heights will build to 9 to 11 feet at 17 seconds to 18 seconds tonight and early Tuesday morning before subsiding late Tuesday morning. A much longer period swell train arrives Wednesday and result in a much greater risk of these hazards. CAZ529-301830- /O.CAN.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ Northern Monterey Bay- 929 AM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT IS CANCELLED... The National Weather Service in San Francisco has cancelled the Beach Hazards Statement. Due to the NW swell direction, the Northern Monterey Bay south facing beaches will be shielded from this event. $$ CAZ006-505-509-530-010500- /O.CON.KMTR.BH.S.0011.201130T1800Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 929 AM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH TUESDAY MORNING... * HAZARDS...Increased risk of sneaker waves and rip currents, especially along the west and northwest facing beaches. Additionally, breaking waves initially from 7 to 10 feet at 19 seconds today, then breaks from 10 to 13 feet at 17 seconds to 18 seconds tonight and early Tuesday morning. * TIMING...10 AM PST today to 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. Excludes the Northern Monterey Bay beaches due to their southerly orientation. * ADDITIONAL DETAILS...A much longer period northwest swell will arrive Wednesday and continue through Thursday and result in a much greater risk for sneaker waves and rip currents. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as large waves will be capable of sweeping people into the frigid and turbulent ocean water. Cold water shock may cause cardiac arrest, and it also can cause an involuntary gasp reflex causing drowning, even for a good swimmer. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
931 WHUS46 KMTR 010411 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 811 PM PST Mon Nov 30 2020 ...Enhanced Risk of Sneaker Waves and Rip Currents for west and northwest facing beaches into Tuesday... .A long period northwest swell will continue to impact the coastline through late Tuesday morning before subsiding. Swell heights of 9 to 11 feet at 17 seconds to 18 seconds are expected tonight and early Tuesday morning before subsiding late Tuesday morning. A much longer period swell train arrives Wednesday and will result in a much greater risk of sneaker waves and rip currents. CAZ006-505-509-530-011800- /O.CON.KMTR.BH.S.0011.000000T0000Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 811 PM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH TUESDAY MORNING... * HAZARDS...Increased risk of sneaker waves and rip currents, especially along the west and northwest facing beaches. Additionally, breaking waves from 10 to 13 feet at 17 seconds to 18 seconds into early Tuesday morning. * TIMING...Remains in effect until 10 AM Tuesday. * LOCATION...Coastal Sonoma County to coastal Monterey County, in particular west to northwest facing beaches. Excludes the Northern Monterey Bay beaches due to their southerly orientation. * ADDITIONAL DETAILS...A much longer period northwest swell will arrive Wednesday and continue through Thursday and result in a much greater risk for sneaker waves and rip currents. * POTENTIAL IMPACTS...Increased risk of ocean drowning. Sneaker waves often catch people off guard and knock them into the ocean. Rip currents can pull swimmers and surfers out to sea. Large breaking waves can cause injury, wash people off beaches and rocks, and capsize small boats near shore. Use extreme caution near the surf zone as 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
951 WHUS46 KMTR 011747 CFWMTR Coastal Hazard Message National Weather Service San Francisco CA 947 AM PST Tue Dec 1 2020 CAZ006-505-509-530-011900- /O.EXP.KMTR.BH.S.0011.000000T0000Z-201201T1800Z/ San Francisco- Coastal North Bay Including Point Reyes National Seashore- San Francisco Peninsula Coast- Southern Monterey Bay and Big Sur Coast- 947 AM PST Tue Dec 1 2020 ...BEACH HAZARDS STATEMENT WILL EXPIRE AT 10 AM PST THIS MORNING... Moderate breaking waves along the coast are possible through the remainder of the day so remain vigilant if visiting the coast. A much longer period northwest swell arrives tomorrow through Thursday which will bring a very high risk of stronger than usual sneaker waves and rip currents. A new Beach Hazard Statement for the Wednesday to Thursday event will be issued later today. $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 29, 4:07 AM PST | Small Craft Advisory | MTR | 57 hr | |
| Nov 29, 2:39 PM PST | Small Craft Advisory | MTR | 42 hr |
Nearby
Beach Hazards Statements in California, 2020Every beach hazards statement in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.