Alert archive / California / High Surf Advisories in 2021
High Surf Advisory 3, NWS Eureka, CA
NWS Eureka, CA issued this high surf advisory at Jan 6, 2021, 3:35 AM PST for Del Norte County, Humboldt County, California. It took effect at Jan 6, 2021, 9:00 AM PST. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Jan 6, 2021, 3:35 AM PST (11:35 UTC)
- In effect from
- Jan 6, 2021, 9:00 AM PST
- Expired
- Jan 6, 2021, 6:00 PM PST
- In force
- 9 hr
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 86 km from the middle of the area, began a volume at 11:35 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, 11.6 hours before the alert went out and 158 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
- 1181 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 321 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
454 WHUS46 KEKA 061135 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 335 AM PST Wed Jan 6 2021 CAZ101>104-061945- /O.NEW.KEKA.SU.Y.0003.210106T1700Z-210107T0200Z/ Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Southwestern Humboldt- 335 AM PST Wed Jan 6 2021 ...HIGH SURF ADVISORY IN EFFECT FROM 9 AM THIS MORNING TO 6 PM PST THIS EVENING... * WHAT...Large breaking waves 20 to 23 ft. * WHERE...Coastal Del Norte, Del Norte Interior, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...From 9 AM this morning to 6 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. && $$
3 follow-up statements
470 WHUS46 KEKA 061156 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 356 AM PST Wed Jan 6 2021 CAZ102-061300- /O.CAN.KEKA.SU.Y.0003.210106T1700Z-210107T0200Z/ Del Norte Interior- 356 AM PST Wed Jan 6 2021 ...HIGH SURF ADVISORY IS CANCELLED... The initial advisory message was issued for the Del Norte Interior zone in error. Please disregard. $$ CAZ101-103-104-062000- /O.CON.KEKA.SU.Y.0003.210106T1700Z-210107T0200Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- 356 AM PST Wed Jan 6 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 9 AM THIS MORNING TO 6 PM PST THIS EVENING... * WHAT...Large breaking waves 20 to 23 ft. * WHERE...Coastal Del Norte, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...From 9 AM this morning to 6 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. && $$
014 WHUS46 KEKA 061945 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1145 AM PST Wed Jan 6 2021 CAZ101-103-104-070200- /O.CON.KEKA.SU.Y.0003.000000T0000Z-210107T0200Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- 1145 AM PST Wed Jan 6 2021 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM PST THIS EVENING... * WHAT...Large breaking waves 18 to 22 feet. * WHERE...Coastal Del Norte, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...Until 6 PM PST this evening.. . * IMPACTS...Dangerous surfing conditions and localized beach erosion. Beachcombing is highly discouraged!. PRECAUTIONARY/PREPAREDNESS ACTIONS... Large breaking waves along the coast will lead to increased wave run-up on beaches with waves topping and washing over large rocks and jetties. These large waves can be erratic and unpredictable. Use extra caution near the surf zone as these large waves will be capable of sweeping people into the frigid and turbulent ocean water. Mariners traversing the bar are urged to exercise extreme caution or stay in port until the threat subsides. Please contact the U.S. Coast Guard for information regarding harbor and bar closures. && $$
758 WHUS46 KEKA 070201 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 601 PM PST Wed Jan 6 2021 CAZ101-103-104-070315- /O.EXP.KEKA.SU.Y.0003.000000T0000Z-210107T0200Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- 601 PM PST Wed Jan 6 2021 ...HIGH SURF ADVISORY HAS EXPIRED... While the surf has begun to subside, breakers may continue to approach 20 feet through late this evening. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 6, 9:02 AM PST | Gale Watch | EKA | 17 hr | |
| Jan 6, 2:30 PM PST | Wind Advisory | EKA | Del Norte, Humboldt | 36 hr |
| Jan 6, 2:41 PM PST | Winter Weather Advisory | EKA | 43 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.