Alert archive / California / High Surf Advisories in 2021
High Surf Advisory 7, NWS Eureka, CA
NWS Eureka, CA issued this high surf advisory at Oct 25, 2021, 5:29 PM PDT for Del Norte County, Humboldt County, Mendocino County, California. It was in force for 6 hr.
The area
The counties it named.
The facts
- Issued
- Oct 25, 2021, 5:29 PM PDT (00:29 UTC)
- Expired
- Oct 25, 2021, 11:00 PM PDT
- In force
- 6 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 00:30 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, 0.5 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
- 5 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 1414 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 128 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
060 WHUS46 KEKA 260029 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 529 PM PDT Mon Oct 25 2021 CAZ101-103-104-109-260600- /O.CAN.KEKA.SU.W.0002.000000T0000Z-211026T0600Z/ /O.NEW.KEKA.SU.Y.0007.211026T0029Z-211026T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 529 PM PDT Mon Oct 25 2021 ...HIGH SURF ADVISORY IN EFFECT UNTIL 11 PM PDT THIS EVENING... ...HIGH SURF WARNING IS CANCELLED... * WHAT...Large breaking waves up to 25 feet possible. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast Counties. * WHEN...Until 11 PM PDT 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. && $$
1 follow-up statement
597 WHUS46 KEKA 260546 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1046 PM PDT Mon Oct 25 2021 CAZ101-103-104-109-260700- /O.EXP.KEKA.SU.Y.0007.000000T0000Z-211026T0600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 1046 PM PDT Mon Oct 25 2021 ...HIGH SURF ADVISORY WILL EXPIRE AT 11 PM PDT THIS EVENING... $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 26, 2:28 AM PDT | Small Craft Advisory | EKA | 64 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.