Alert archive / California / High Surf Advisories in 2017
High Surf Advisory 5, NWS Eureka, CA
NWS Eureka, CA issued this high surf advisory at Oct 18, 2017, 6:16 AM PDT for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Oct 19, 2017, 5:00 PM PDT. It was in force for 25 hr.
The area
The counties it named.
The facts
- Issued
- Oct 18, 2017, 6:16 AM PDT (13:16 UTC)
- In effect from
- Oct 19, 2017, 5:00 PM PDT
- Expired
- Oct 20, 2017, 6:00 PM PDT
- 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 13:18 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 12:00Z, 1.3 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
- 1795 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
521 WHUS46 KEKA 181316 CCA CFWEKA COASTAL HAZARD MESSAGE...CORRECTED NATIONAL WEATHER SERVICE EUREKA CA 616 AM PDT WED OCT 18 2017 ...HIGH SURF EXPECTED THURSDAY NIGHT THROUGH FRIDAY... .A HUGE NORTHWEST SWELL AROUND 20 FEET WITH PERIODS NEAR 17 SECONDS WILL SPREAD INTO THE COASTAL WATERS THURSDAY NIGHT. THE HUGE SWELL WILL PERSIST THROUGH THE DAY ON FRIDAY RESULTING IN BREAKERS OF 23 TO 25 FEET IN THE SURF ZONE. THIS WILL POSE A THREAT TO BEACH GOERS AND MARINERS TRAVERSING HARBOR ENTRANCES. CAZ101-103-104-109-182230- /O.NEW.KEKA.SU.Y.0001.171020T0100Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 616 AM PDT WED OCT 18 2017 ...HIGH SURF ADVISORY IN EFFECT FROM 6 PM THURSDAY TO 6 PM PDT FRIDAY... THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A HIGH SURF ADVISORY...WHICH IS IN EFFECT FROM 6 PM THURSDAY TO 6 PM PDT FRIDAY. * WAVES AND SURF...BREAKING WAVES 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...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 ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 3:30 AM AND 4:00 PM FRIDAY...OR STAY IN PORT UNTIL THE THREAT SUBSIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. && $$
8 follow-up statements
526 WHUS46 KEKA 182237 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 337 PM PDT WED OCT 18 2017 ...HIGH SURF EXPECTED THURSDAY NIGHT THROUGH FRIDAY... .A HUGE NORTHWEST SWELL AROUND 20 FEET WITH PERIODS NEAR 17 SECONDS WILL SPREAD INTO THE COASTAL WATERS THURSDAY NIGHT. THE HUGE SWELL WILL PERSIST THROUGH THE DAY ON FRIDAY RESULTING IN BREAKERS OF 23 TO 25 FEET IN THE SURF ZONE. THIS WILL POSE A THREAT TO BEACH GOERS AND MARINERS TRAVERSING HARBOR ENTRANCES. CAZ101-103-104-109-192200- /O.CON.KEKA.SU.Y.0001.171020T0100Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 337 PM PDT WED OCT 18 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 6 PM THURSDAY TO 6 PM PDT FRIDAY... * WAVES AND SURF...BREAKING WAVES 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR ARE URGED TO EXERCISE EXTREME CAUTION ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 3:30 AM AND 4:00 PM FRIDAY...OR STAY IN PORT UNTIL THE THREAT SUBSIDES. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. && $$
335 WHUS46 KEKA 190223 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 723 PM PDT WED OCT 18 2017 ...HIGH SURF EXPECTED THURSDAY NIGHT THROUGH FRIDAY... .A LARGE NORTHWEST SWELL AROUND 20 FEET WITH A PERIOD NEAR 17 SECONDS WILL SPREAD ACROSS THE COASTAL WATERS THURSDAY NIGHT INTO FRIDAY. BREAKERS FROM 23 TO 25 FEET ARE EXPECTED IN THE SURF ZONE, AND WILL POSE A THREAT TO BEACH GOERS AND MARINERS TRAVERSING HARBOR ENTRANCES. CAZ101-103-104-109-191400- /O.CON.KEKA.SU.Y.0001.171020T0100Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 723 PM PDT WED OCT 18 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 6 PM THURSDAY TO 6 PM PDT FRIDAY... * WAVES AND SURF...BREAKING WAVES 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...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...ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 3:30 AM AND 4:00 PM FRIDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. && $$
799 WHUS46 KEKA 190315 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 815 PM PDT WED OCT 18 2017 ...HIGH SURF EXPECTED THURSDAY NIGHT THROUGH FRIDAY... .A LARGE NORTHWEST SWELL AROUND 20 FEET WITH A PERIOD NEAR 17 SECONDS WILL SPREAD ACROSS THE COASTAL WATERS THURSDAY NIGHT INTO FRIDAY. BREAKERS FROM 23 TO 25 FEET ARE EXPECTED IN THE SURF ZONE, AND WILL POSE A THREAT TO BEACH GOERS AND MARINERS TRAVERSING HARBOR ENTRANCES. CAZ101-103-104-109-191400- /O.EXT.KEKA.SU.Y.0001.171020T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 815 PM PDT WED OCT 18 2017 ...HIGH SURF ADVISORY NOW IN EFFECT FROM 5 PM THURSDAY TO 6 PM PDT FRIDAY... * WAVES AND SURF...BREAKING WAVES 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR ARE URGED TO EXERCISE EXTREME CAUTION...OR STAY IN PORT...ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 3:30 AM AND 4:00 PM FRIDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. && $$
720 WHUS46 KEKA 191042 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 342 AM PDT THU OCT 19 2017 CAZ101-103-104-109-192330- /O.CON.KEKA.SU.Y.0001.171020T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 342 AM PDT THU OCT 19 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 5 PM THIS AFTERNOON TO 6 PM PDT FRIDAY... * WAVES AND SURF...BREAKING WAVES 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...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... ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 3:30 AM AND 4:00 PM FRIDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. && $$
186 WHUS46 KEKA 192245 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 345 PM PDT THU OCT 19 2017 CAZ101-103-104-109-201100- /O.CON.KEKA.SU.Y.0001.171020T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 345 PM PDT THU OCT 19 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM FRIDAY... * WAVES AND SURF...BREAKING WAVES BUILDING TO 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR ARE URGED TO EXERCISE EXTREME CAUTION...OR STAY IN PORT... ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 330 AM AND 400 PM FRIDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. $$
316 WHUS46 KEKA 200305 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 805 PM PDT THU OCT 19 2017 CAZ101-103-104-109-201400- /O.CON.KEKA.SU.Y.0001.000000T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 805 PM PDT THU OCT 19 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT FRIDAY... * WAVES AND SURF...BREAKING WAVES BUILDING TO 22 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...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... ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 330 AM AND 400 PM FRIDAY. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. $$
410 WHUS46 KEKA 201016 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 316 AM PDT FRI OCT 20 2017 CAZ101-103-104-109-210100- /O.CON.KEKA.SU.Y.0001.000000T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 316 AM PDT FRI OCT 20 2017 ...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 6 PM PDT THIS EVENING... * WAVES AND SURF...BREAKING WAVES TO 23 TO 25 FEET ALONG WEST AND NORTHWEST FACING BEACHES. * IMPACTS...LARGE BREAKING WAVES ALONG THE COAST WILL LEAD TO INCREASED WAVE RUN-UP ON BEACHES WITH WAVES TOPPING AND WASHING OVER LARGE ROCKS AND JETTIES. THESE LARGE WAVES CAN BE ERRATIC AND UNPREDICTABLE. USE EXTRA CAUTION NEAR THE SURF ZONE AS THESE LARGE WAVES WILL BE CAPABLE OF SWEEPING PEOPLE INTO THE FRIGID AND TURBULENT OCEAN WATER. MARINERS TRAVERSING THE BAR ARE URGED TO EXERCISE EXTREME CAUTION...ESPECIALLY DURING MAX EBB WHICH IS PREDICTED TO OCCUR AROUND 400 PM TODAY...OR STAY IN PORT. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN THE ADVISORY AREA, PRODUCING RIP CURRENTS AND LOCALIZED BEACH EROSION. $$
868 WHUS46 KEKA 210047 CFWEKA COASTAL HAZARD MESSAGE NATIONAL WEATHER SERVICE EUREKA CA 547 PM PDT FRI OCT 20 2017 CAZ101-103-104-109-210200- /O.EXP.KEKA.SU.Y.0001.000000T0000Z-171021T0100Z/ COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT- MENDOCINO COAST- 547 PM PDT FRI OCT 20 2017 ...HIGH SURF ADVISORY WILL EXPIRE AT 6 PM PDT THIS EVENING... * THIS IS THE FINAL STATEMENT FOR THIS EVENT. $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 18, 2:37 PM PDT | Wind Advisory | EKA | Del Norte, Humboldt | 26 hr |
| Oct 18, 3:18 PM PDT | Hazardous Seas Warning | EKA | 51 hr |
Nearby
High Surf Advisories in California, 2017Every high surf advisory in 2017
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.