Alert archive / California / Beach Hazards Statements in 2020
Beach Hazards Statement 9, NWS Eureka, CA
NWS Eureka, CA issued this beach hazards statement at Nov 30, 2020, 3:26 AM PST for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Dec 2, 2020, 7:00 AM PST. It was in force for 25 hr.
The area
The counties it named.
The facts
- Issued
- Nov 30, 2020, 3:26 AM PST (11:26 UTC)
- In effect from
- Dec 2, 2020, 7:00 AM PST
- Expired
- Dec 3, 2020, 8:00 AM PST
- In force
- 25 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 11:31 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, 11.4 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
- 1596 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 74 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
887 WHUS46 KEKA 301126 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 326 AM PST Mon Nov 30 2020 CAZ101-103-104-109-302000- /O.NEW.KEKA.BH.S.0009.201202T1500Z-201203T0800Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 326 AM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast Counties. * WHEN...From Wednesday morning through Wednesday evening. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. * ADDITIONAL DETAILS...As the waves build on Thursday, the sneaker wave threat will diminish. However, some set behavior will remain, with occasionally larger breaking waves and greater wave run-up. PRECAUTIONARY/PREPAREDNESS ACTIONS... Caution should be used when in or near the ocean. Stay a safe distance from the water along beaches, rock, jetties, piers, and other waterside infrastructure. Remain out of the water to avoid dangerous swimming conditions. Never turn your back on the ocean. Steep beaches will have the highest risk of sneaker wave activity. && $$
10 follow-up statements
740 WHUS46 KEKA 301951 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1151 AM PST Mon Nov 30 2020 CAZ101-103-104-109-011100- /O.CON.KEKA.BH.S.0009.201202T1500Z-201203T0800Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 1151 AM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt and Mendocino Coast Counties. * WHEN...From Wednesday morning through Wednesday evening. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. * ADDITIONAL DETAILS...The sneaker wave threat will diminish by Thursday. However, caution should still be exercised as occasionally larger breaking waves are always possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
183 WHUS46 KEKA 010620 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1020 PM PST Mon Nov 30 2020 CAZ101-103-104-109-011430- /O.CON.KEKA.BH.S.0009.201202T1500Z-201203T0800Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 1020 PM PST Mon Nov 30 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt Coast, and Coastal Mendocino County. * WHEN...From Wednesday morning through Wednesday evening. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. * ADDITIONAL DETAILS...The sneaker wave threat will diminish by Thursday. However, caution should still be exercised as occasionally larger breaking waves are always possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
426 WHUS46 KEKA 011110 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 310 AM PST Tue Dec 1 2020 CAZ101-103-104-109-011915- /O.CON.KEKA.BH.S.0009.201202T1500Z-201203T0800Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 310 AM PST Tue Dec 1 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt Coast, and Coastal Mendocino County. * WHEN...From Wednesday morning through Wednesday evening. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. * ADDITIONAL DETAILS...The sneaker wave threat will diminish by Thursday. However, caution should still be exercised as occasionally larger breaking waves are always possible. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain vigilant when in the surf zone to avoid sneaker waves catching you off guard. There may be up to 30 minutes between large waves. && $$
915 WHUS46 KEKA 011617 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 817 AM PST Tue Dec 1 2020 CAZ101-103-104-109-020515- /O.CON.KEKA.BH.S.0009.201202T1500Z-201203T0800Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 817 AM PST Tue Dec 1 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM WEDNESDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt Coast, and Coastal Mendocino County. * WHEN...From Wednesday morning through Wednesday evening. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
739 WHUS46 KEKA 020422 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 822 PM PST Tue Dec 1 2020 CAZ101-103-104-109-021230- /O.EXT.KEKA.BH.S.0009.201202T1500Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 822 PM PST Tue Dec 1 2020 ...BEACH HAZARDS STATEMENT NOW IN EFFECT FROM 7 AM PST WEDNESDAY THROUGH THURSDAY MORNING... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Northern Humboldt Coast, Southwestern Humboldt Coast, and Coastal Mendocino County. * WHEN...From Wednesday morning through Thursday morning. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. Occasionally larger waves will also wash over jetties and rock outcroppings that normally stay dry. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
388 WHUS46 KEKA 021041 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 241 AM PST Wed Dec 2 2020 CAZ104-109-021845- /O.EXT.KEKA.BH.S.0009.201202T1800Z-201203T1600Z/ Southwestern Humboldt-Mendocino Coast- 241 AM PST Wed Dec 2 2020 ...BEACH HAZARDS STATEMENT NOW IN EFFECT FROM 10 AM PST THIS MORNING THROUGH THURSDAY MORNING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Mendocino Coast and Southwestern Humboldt Counties. * WHEN...From 10 AM PST this morning through Thursday morning.. . * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. * ADDITIONAL DETAILS...Sneaker waves occur when long period swells arrive in sets at the beaches. This means there may be lulls up to 30 minutes between the larger sets that run much farther up the beach and can catch people off guard. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain vigilant when in the surf zone to avoid sneaker waves catching you off guard. && $$ CAZ101-103-021845- /O.CON.KEKA.BH.S.0009.201202T1500Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast- 241 AM PST Wed Dec 2 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT FROM 7 AM PST THIS MORNING THROUGH THURSDAY MORNING... * WHAT...A long period west-northwesterly swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte and Northern Humboldt Coast Counties. * WHEN...From 7 AM PST this morning through Thursday morning.. . * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. * ADDITIONAL DETAILS...Sneaker waves occur when long period swells arrive in sets at the beaches. This means there may be lulls up to 30 minutes between the larger sets that run much farther up the beach and can catch people off guard. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain vigilant when in the surf zone to avoid sneaker waves catching you off guard. && $$
730 WHUS46 KEKA 021831 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1031 AM PST Wed Dec 2 2020 CAZ101-103-104-109-030245- /O.CON.KEKA.BH.S.0009.000000T0000Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 1031 AM PST Wed Dec 2 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THURSDAY MORNING... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte and Northern Humboldt Coast Counties. * WHEN...From 7 AM PST this morning through Thursday morning.. . * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain vigilant when in the surf zone to avoid sneaker waves catching you off guard. Never turn your back on the ocean! && $$
496 WHUS46 KEKA 030231 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 631 PM PST Wed Dec 2 2020 CAZ101-103-104-109-031045- /O.CON.KEKA.BH.S.0009.000000T0000Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 631 PM PST Wed Dec 2 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THURSDAY MORNING... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte County, coastal Humboldt County, and coastal Mendocino County. * WHEN...Through Thursday morning. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
888 WHUS46 KEKA 030636 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 1036 PM PST Wed Dec 2 2020 CAZ101-103-104-109-031445- /O.CON.KEKA.BH.S.0009.000000T0000Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 1036 PM PST Wed Dec 2 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 8 AM PST THURSDAY... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte County, coastal Humboldt County, and coastal Mendocino County. * WHEN...Through Thursday morning. * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Remain out of the water to avoid hazardous swimming conditions. && $$
299 WHUS46 KEKA 030959 CFWEKA Coastal Hazard Message National Weather Service Eureka CA 159 AM PST Thu Dec 3 2020 CAZ101-103-104-109-031600- /O.CON.KEKA.BH.S.0009.000000T0000Z-201203T1600Z/ Coastal Del Norte-Northern Humboldt Coast-Southwestern Humboldt- Mendocino Coast- 159 AM PST Thu Dec 3 2020 ...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 8 AM PST THIS MORNING... * WHAT...A long-period west to northwest swell will bring a threat of sneaker waves to area beaches. * WHERE...Coastal Del Norte, Mendocino Coast, Northern Humboldt Coast and Southwestern Humboldt Counties. * WHEN...Until 8 AM PST this morning.. . * IMPACTS...Potential sneaker waves may create locally hazardous conditions at area beaches. Steep beaches will have a higher risk of sneaker wave activity with greater wave run-up onto beaches. PRECAUTIONARY/PREPAREDNESS ACTIONS... Don't be fooled by an ocean that looks calm: There can be 30 minutes of small waves before a sneaker wave strikes. Avoid rocks and jetties. Avoid steep beaches. Stay much farther back from the water and never turn your back on the ocean. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 30, 3:05 AM PST | Frost Advisory | EKA | Del Norte, Humboldt, Mendocino | 24 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.