Alert archive / California / High Surf Advisories in 2017

High Surf Advisory 4, NWS Eureka, CA

April 6, 2017Del Norte County, Humboldt County, California

NWS Eureka, CA issued this high surf advisory at Apr 6, 2017, 9:20 AM PDT for Del Norte County, Humboldt County, California. It took effect at Apr 7, 2017, 9:00 AM PDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
Apr 6, 2017, 9:20 AM PDT (16:20 UTC)
In effect from
Apr 7, 2017, 9:00 AM PDT
Expired
Apr 7, 2017, 3:03 PM PDT
In force
6 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 16:23 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, 4.3 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.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 12:00Z on 2017-04-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Medford/Jackson, OR at 12:00Z on 2017-04-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 60 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1395 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
60 m²/s²
0-3 km storm-relative helicity
350 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

047 
WHUS46 KEKA 061620
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
920 AM PDT THU APR 6 2017

...A LARGE FRESH SWELL WILL ENTER THE WATERS ON FRIDAY BRINGING 
LARGE SURF TO COASTAL ZONES NORTHWARD OF CAPE MENDOCINO...

CAZ101-103-104-071200-
/O.NEW.KEKA.SU.Y.0004.170407T1600Z-170407T2300Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
920 AM PDT THU APR 6 2017

...HIGH SURF ADVISORY IN EFFECT FROM 9 AM TO 4 PM PDT FRIDAY...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A HIGH SURF
ADVISORY...WHICH IS IN EFFECT FROM 9 AM TO 4 PM PDT FRIDAY. 

* WAVES AND SURF...BREAKING WAVES 20 TO 24 FEET ALONG WEST AND
  SOUTHWEST 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.

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.

&&

$$
3 follow-up statements
604 
WHUS46 KEKA 071014
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
314 AM PDT FRI APR 7 2017

...A LARGE FRESH SWELL WILL ENTER THE WATERS TODAY RESULTING IN  
LARGE SURF ALONG COASTAL ZONES NORTHWARD OF CAPE MENDOCINO...

CAZ101-103-104-071900-
/O.CON.KEKA.SU.Y.0004.170407T1600Z-170407T2300Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
314 AM PDT FRI APR 7 2017

...HIGH SURF ADVISORY REMAINS IN EFFECT FROM 9 AM THIS MORNING TO
4 PM PDT THIS AFTERNOON...

* WAVES AND SURF...BREAKING WAVES 20 TO 24 FEET ALONG WEST AND 
  SOUTHWEST 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. 

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.

&&

$$
147 
WHUS46 KEKA 071425
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
725 AM PDT FRI APR 7 2017

...A LARGE FRESH SWELL WILL ENTER THE WATERS TODAY RESULTING IN
LARGE SURF ALONG COASTAL ZONES NORTHWARD OF CAPE MENDOCINO...

CAZ101-103-104-072300-
/O.CON.KEKA.SU.Y.0004.170407T1600Z-170407T2300Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
725 AM PDT FRI APR 7 2017

...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 4 PM PDT THIS
AFTERNOON...

* WAVES AND SURF...BREAKING WAVES 20 TO 24 FEET ALONG WEST AND 
  SOUTHWEST 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. 

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.

&&

$$
824 
WHUS46 KEKA 072203
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
303 PM PDT FRI APR 7 2017


CAZ101-103-104-072315-
/O.CAN.KEKA.SU.Y.0004.000000T0000Z-170407T2300Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
303 PM PDT FRI APR 7 2017

...HIGH SURF ADVISORY IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS CANCELLED THE HIGH
SURF ADVISORY. 

SURF HEIGHTS HAVE SUBSIDED BELOW ADVISORY LEVEL CRITERIA BUT LARGE
SURF WILL PERSIST THROUGH SUNSET. 

$$

The office that day

Everything else NWS Eureka, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 6, 12:03 AM PDTWind AdvisoryEKADel Norte, Humboldt7 hr
Apr 6, 4:08 AM PDTWinter Storm WatchEKADel Norte, Humboldt24 hr
Apr 6, 4:23 AM PDTHigh Wind WarningEKADel Norte, Humboldt28 hr
Apr 6, 9:07 AM PDTWind AdvisoryEKADel Norte26 hr
Apr 6, 9:08 AM PDTStorm WarningEKA24 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.