Alert archive / California / Beach Hazards Statements in 2017

Beach Hazards Statement 9, NWS Eureka, CA

December 4, 2017Del Norte County, Humboldt County, Mendocino County, California

NWS Eureka, CA issued this beach hazards statement at Dec 4, 2017, 2:12 AM PST for Del Norte County, Humboldt County, Mendocino County, California. It took effect at Dec 5, 2017, 3:00 AM PST. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued
Dec 4, 2017, 2:12 AM PST (10:12 UTC)
In effect from
Dec 5, 2017, 3:00 AM PST
Expired
Dec 5, 2017, 4:00 PM PST
In force
13 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 10:14 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, 10.2 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.

Skew-T log-pSkew-T log-p diagram, Medford/Jackson, OR at 00:00Z on 2017-12-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2017-12-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 6 square meters per square second.19395878Sfc1 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
2 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
1008 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
6 m²/s²
0-3 km storm-relative helicity
65 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

570 
WHUS46 KEKA 041012
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
212 AM PST MON DEC 4 2017

CAZ101-103-104-109-041815-
/O.NEW.KEKA.BH.S.0009.171205T1100Z-171206T0000Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
MENDOCINO COAST-
212 AM PST MON DEC 4 2017

...BEACH HAZARDS STATEMENT IN EFFECT FROM LATE TONIGHT THROUGH
TUESDAY AFTERNOON...

THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A BEACH HAZARDS
STATEMENT...WHICH IS IN EFFECT FROM LATE TONIGHT THROUGH TUESDAY
AFTERNOON. 

* TIMING...THE HIGHEST SNEAKER WAVE RISK WILL BE FROM EARLY
  TUESDAY MORNING THROUGH THE DAY ON TUESDAY.

* IMPACTS...LARGER SURF AT OFFSHORE BREAKS AND AN ENHANCED RISK 
  OF SNEAKER WAVES ON NORTHWEST CALIFORNIA BEACHES. STEEP 
  BEACHES WILL HAVE A HIGHER RISK OF SNEAKER WAVE ACTIVITY WITH 
  GREATER WAVE RUN-UP ONTO BEACHES. LARGE WAVES WILL ALSO WASH 
  OVER JETTIES AND ROCK OUTCROPPINGS THAT MAY NORMALLY STAY DRY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARDS STATEMENT IS ISSUED WHEN THREATS SUCH AS RIP
CURRENTS...LONGSHORE CURRENTS...SNEAKER WAVES AND OTHER HAZARDS
CREATE LIFE-THREATENING CONDITIONS IN THE SURF ZONE. CAUTION
SHOULD BE USED WHEN IN OR NEAR THE WATER. NEVER TURN YOUR BACK TO
THE OCEAN!

&&

$$
2 follow-up statements
968 
WHUS46 KEKA 050833
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
1233 AM PST TUE DEC 5 2017

CAZ101-103-104-109-051645-
/O.CON.KEKA.BH.S.0009.171205T1100Z-171206T0000Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
MENDOCINO COAST-
1233 AM PST TUE DEC 5 2017

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT THROUGH THIS
AFTERNOON...

* TIMING...THE HIGHEST SNEAKER WAVE RISK WILL BE FROM EARLY 
  TUESDAY MORNING THROUGH THE DAY ON TUESDAY. 

* IMPACTS...LARGER SURF AT OFFSHORE BREAKS AND AN ENHANCED RISK 
  OF SNEAKER WAVES ON NORTHWEST CALIFORNIA BEACHES. STEEP 
  BEACHES WILL HAVE A HIGHER RISK OF SNEAKER WAVE ACTIVITY WITH 
  GREATER WAVE RUN-UP ONTO BEACHES. LARGE WAVES WILL ALSO WASH 
  OVER JETTIES AND ROCK OUTCROPPINGS THAT MAY NORMALLY STAY DRY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARDS STATEMENT IS ISSUED WHEN THREATS SUCH AS RIP
CURRENTS...LONGSHORE CURRENTS...SNEAKER WAVES AND OTHER HAZARDS
CREATE LIFE-THREATENING CONDITIONS IN THE SURF ZONE. CAUTION
SHOULD BE USED WHEN IN OR NEAR THE WATER. NEVER TURN YOUR BACK TO
THE OCEAN!

&&

$$
947 
WHUS46 KEKA 051220
CFWEKA

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE EUREKA CA
420 AM PST TUE DEC 5 2017

CAZ101-103-104-109-052030-
/O.CON.KEKA.BH.S.0009.000000T0000Z-171206T0000Z/
COASTAL DEL NORTE-NORTHERN HUMBOLDT COAST-SOUTHWESTERN HUMBOLDT-
MENDOCINO COAST-
420 AM PST TUE DEC 5 2017

...BEACH HAZARDS STATEMENT REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON...

* TIMING...THE HIGHEST SNEAKER WAVE RISK WILL BE FROM EARLY 
  TUESDAY MORNING THROUGH THE DAY ON TUESDAY. 

* IMPACTS...LARGER SURF AT OFFSHORE BREAKS AND AN ENHANCED RISK 
  OF SNEAKER WAVES ON NORTHWEST CALIFORNIA BEACHES. STEEP 
  BEACHES WILL HAVE A HIGHER RISK OF SNEAKER WAVE ACTIVITY WITH 
  GREATER WAVE RUN-UP ONTO BEACHES. LARGE WAVES WILL ALSO WASH 
  OVER JETTIES AND ROCK OUTCROPPINGS THAT MAY NORMALLY STAY DRY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BEACH HAZARDS STATEMENT IS ISSUED WHEN THREATS SUCH AS RIP
CURRENTS...LONGSHORE CURRENTS...SNEAKER WAVES AND OTHER HAZARDS
CREATE LIFE-THREATENING CONDITIONS IN THE SURF ZONE. CAUTION
SHOULD BE USED WHEN IN OR NEAR THE WATER. NEVER TURN YOUR BACK TO
THE OCEAN!

&&

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 3, 7:06 PM PSTSmall Craft AdvisoryEKA17 hr
Dec 4, 10:13 AM PSTFrost AdvisoryEKADel Norte, Humboldt23 hr

Nearby

Beach Hazards Statements in California, 2017Every beach hazards statement 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.