Alert archive / California / High Surf Advisories in 2021
High Surf Advisory 4, NWS Eureka, CA
NWS Eureka, CA issued this high surf advisory at Jan 7, 2021, 3:16 AM PST for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Jan 8, 2021, 4:00 AM PST. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Jan 7, 2021, 3:16 AM PST (11:16 UTC)
- In effect from
- Jan 8, 2021, 4:00 AM PST
- Expired
- Jan 8, 2021, 10:00 PM PST
- In force
- 18 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 47 km from the middle of the area, began a volume at 11:21 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
Medford/Jackson, OR (KMFR), launched 00:00Z, 11.3 hours before the alert went out and 210 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
- 850 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 138 m²/s²
- 0-3 km storm-relative helicity
- 234 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
348 WHUS46 KEKA 071116 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 316 AM PST Thu Jan 7 2021 CAZ101-103-104-109-071930- /O.NEW.KEKA.SU.Y.0004.210108T1200Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 316 AM PST Thu Jan 7 2021 ...HIGH SURF ADVISORY IN EFFECT FROM 4 AM TO 10 PM PST FRIDAY... * WHAT...Large breaking waves 20 to 23 feet. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coasts. * WHEN...From 4 AM to 10 PM PST Friday. * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! 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. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
7 follow-up statements
776 WHUS46 KEKA 071647 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 847 AM PST Thu Jan 7 2021 CAZ101-103-104-109-080100- /O.CON.KEKA.SU.Y.0004.210108T1200Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 847 AM PST Thu Jan 7 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 4 AM TO 10 PM PST FRIDAY... * WHAT...Large breaking waves 20 to 23 feet * WHERE...Coastal Del Norte, Mendocino Coast, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...From 4 AM to 10 PM PST Friday.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged!. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
272 WHUS46 KEKA 072243 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 243 PM PST Thu Jan 7 2021 CAZ101-103-104-109-080600- /O.CON.KEKA.SU.Y.0004.210108T1200Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 243 PM PST Thu Jan 7 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 4 AM TO 10 PM PST FRIDAY... * WHAT...Large breaking waves 21 to 23 feet. * WHERE...Coastal Del Norte, Mendocino Coast and Humboldt Coast. * WHEN...From 4 AM to 10 PM PST Friday.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged!. 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. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
887 WHUS46 KEKA 080501 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 901 PM PST Thu Jan 7 2021 CAZ101-103-104-109-081200- /O.CON.KEKA.SU.Y.0004.210108T1200Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 901 PM PST Thu Jan 7 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 4 AM TO 10 PM PST FRIDAY... * WHAT...Large breaking waves 20 to 22 feet. * WHERE...Coastal Del Norte, Mendocino Coast and Humboldt Coast. * WHEN...From 4 AM to 10 PM PST Friday.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged!. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
220 WHUS46 KEKA 081149 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 349 AM PST Fri Jan 8 2021 CAZ101-103-104-109-082000- /O.CON.KEKA.SU.Y.0004.210108T1200Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 349 AM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... * WHAT...Large breaking waves 20 to 23 feet. * WHERE...Coastal Del Norte, Mendocino Coast, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...Until 10 PM PST this evening. * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! 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. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
639 WHUS46 KEKA 081641 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 841 AM PST Fri Jan 8 2021 CAZ101-103-104-109-090045- /O.CON.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 841 AM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... * WHAT...Large breaking waves 20 to 23 feet. * WHERE...Coastal Del Norte, Mendocino Coast, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...Until 10 PM PST this evening.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! PRECAUTIONARY/PREPAREDNESS ACTIONS... Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
982 WHUS46 KEKA 082221 CFWEKA URGENT - IMMEDIATE BROADCAST REQUESTED Coastal Hazard Message National Weather Service Eureka CA 221 PM PST Fri Jan 8 2021 CAZ101-090630- /O.NEW.KEKA.CF.A.0001.210110T1100Z-210110T1800Z/ /O.CON.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ Coastal Del Norte- 221 PM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... ...COASTAL FLOOD WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... * WHAT...For the High Surf Advisory, large breaking waves of 20 to 23 feet. For the Coastal Flood Watch, breaking waves of 28 to 30 feet and high astronomical tides. Up to a half foot of saltwater inundation is possible above sea level. * WHERE...Coastal Del Norte County. * WHEN...For the High Surf Advisory, until 10 PM PST this evening. For the Coastal Flood Watch, from late Saturday night through Sunday morning. * IMPACTS...For the high Surf Watch, Highway 101 at South Beach may see waves break across it at high tide. Low lying property including homes, businesses, and some critical infrastructure may be inundated. For the High Surf Advisory, some shoreline erosion may occur. Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. 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. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$ CAZ103-104-090630- /O.NEW.KEKA.CF.A.0001.210110T1100Z-210110T1800Z/ /O.CON.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ Northern Humboldt Coast-Southwestern Humboldt- 221 PM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... ...COASTAL FLOOD WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... * WHAT...For the High Surf Advisory, large breaking waves of 19 to 22 feet. For the Coastal Flood Watch, large breaking waves of 28 to 30 feet. * WHERE...Humboldt County Coast. * WHEN...For the High Surf Advisory, until 10 PM PST this evening. For the Coastal Flood Watch, from late Saturday night through Sunday morning. Up to a half foot of saltwater inundation is possible above sea level. * IMPACTS...For the high Surf Watch, Centerville Beach Road, New Navy Base Road and possibly other exposed coastal roads may see waves break across it at high tide. Low lying property including homes, businesses, and some critical infrastructure may be inundated. For the High Surf Advisory, some shoreline erosion may occur. Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$ CAZ109-090600- /O.CON.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ Mendocino Coast- 221 PM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS EVENING... * WHAT...Large breaking waves 19 to 22 feet. * WHERE...Mendocino Coast County. * WHEN...Until 10 PM PST this evening.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged! 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. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
364 WHUS46 KEKA 090604 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1004 PM PST Fri Jan 8 2021 CAZ101-091415- /O.EXP.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ /O.CON.KEKA.CF.A.0001.210110T1100Z-210110T1800Z/ Coastal Del Norte- 1004 PM PST Fri Jan 8 2021 ...COASTAL FLOOD WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... ...HIGH SURF ADVISORY HAS EXPIRED... * WHAT...Breaking waves of 28 to 30 feet and high astronomical tides. Up to a half foot of saltwater inundation is possible above sea level. * WHERE...Coastal Del Norte. * WHEN...From late Saturday night through Sunday morning.. . * IMPACTS...Highway 101 at South Beach may see waves break over the road at high tide. Low lying property including homes, businesses, and some critical infrastructure may be inundated. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. && $$ CAZ103-104-091415- /O.EXP.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ /O.CON.KEKA.CF.A.0001.210110T1100Z-210110T1800Z/ Northern Humboldt Coast-Southwestern Humboldt- 1004 PM PST Fri Jan 8 2021 ...COASTAL FLOOD WATCH REMAINS IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY MORNING... ...HIGH SURF ADVISORY HAS EXPIRED... * WHAT...Large breaking waves of 28 to 30 feet. * WHERE...Humboldt Coast. * WHEN...From late Saturday night through Sunday morning.. . * IMPACTS...Centerville Beach Road, New Navy Base Road and possibly other exposed coastal roads may see waves break over the road at high tide. Low lying property including homes, businesses, and some critical infrastructure may be inundated. PRECAUTIONARY/PREPAREDNESS ACTIONS... If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. && $$ CAZ109-090715- /O.EXP.KEKA.SU.Y.0004.000000T0000Z-210109T0600Z/ Mendocino Coast- 1004 PM PST Fri Jan 8 2021 ...HIGH SURF ADVISORY HAS EXPIRED... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 6, 8:48 PM PST | Gale Warning | EKA | 30 hr |
Nearby
High Surf Advisories in California, 2021Every high surf advisory 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.