Alert archive / Hawaii / High Surf Advisories in 2007

High Surf Advisory 21, NWS Honolulu, HI

April 21, 2007Honolulu County, Kauai County, Hawaii

NWS Honolulu, HI issued this high surf advisory at Apr 21, 2007, 12:00 AM HST for Honolulu County, Kauai County, Hawaii. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Apr 21, 2007, 12:00 AM HST (10:00 UTC)
Expired: Apr 21, 2007, 9:41 AM HST
In force: 10 hr
Issued by: NWS Honolulu, HI

Counties Honolulu County, HI, Kauai County, HI

The nearest sounding before it

Lihue, (PHLI), launched 00:00Z, 10.0 hours before the alert went out and 60 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 259 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 827 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 30 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000
WHHW40 PHFO 211000
CFWHFO

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
1200 AM HST SAT APR 21 2007

...HIGH SURF ADVISORY FOR NORTH AND WEST FACING SHORES OF NIIHAU KAUAI
OAHU MOLOKAI AND MAUI UNTIL 6 PM SUNDAY...

.OVERVIEW...ANOTHER LATE SEASON LARGE NORTHWEST SWELL HAS REACHED
BUOY ONE AND WILL AFFECT THE MAIN HAWAIIAN ISLANDS BY EARLY
SATURDAY MORNING. THIS SWELL WAS PRODUCED BY A STORM FAR
NORTHWEST OF THE ISLANDS A FEW DAYS AGO.

A HIGH SURF ADVISORY MEANS THAT WAVES ALONG THE AFFECTED SHORES
WILL BE HIGHER THAN NORMAL. BEACH GOERS ARE URGED TO STAY OUT OF
THE WATER AND WELL AWAY FROM THE SHORE BREAK DUE TO THE HAZARDOUS
WAVE ACTION AND STRONG RIP CURRENTS.

HIZ001>004-006>008-012-013-020-212300-
/O.NEW.PHFO.SU.Y.0021.070421T1000Z-070423T0400Z/
NIIHAU-KAUAI WINDWARD-KAUAI LEEWARD-KAUAI MOUNTAINS-WAIANAE COAST-
OAHU NORTH SHORE-OAHU KOOLAU-MOLOKAI WINDWARD-MOLOKAI LEEWARD-
WINDWARD HALEAKALA-
1200 AM HST SAT APR 21 2007

...HIGH SURF ADVISORY IN EFFECT UNTIL 6 PM HST SUNDAY...

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A HIGH SURF
ADVISORY...WHICH IS IN EFFECT UNTIL 6 PM HST SUNDAY. 

SURF ALONG NORTH FACING SHORES WILL RISE TO 12 TO 18 FEET FOR
NORTH FACING SHORES SATURDAY.

SURF ALONG WEST FACING SHORES WILL RISE TO 8 TO 12 FEET FOR WEST
FACING SHORES SATURDAY.

$$

1 follow-up statement

000
WHHW40 PHFO 211941
CFWHFO

COASTAL HAZARD MESSAGE
NATIONAL WEATHER SERVICE HONOLULU HI
941 AM HST SAT APR 21 2007

...HIGH SURF ADVISORY IS CANCELED...

.OVERVIEW...SWELL DATA FROM BUOY ONE NO LONGER SHOWS SUFFICIENT
ENERGY TO KEEP A HIGH SURF ADVISORY IN EFFECT. EARLIER LARGER
SWELL HAS ALREADY REACHED KAUAI...WITH LESS THAN ADVISORY LEVEL
SURF REPORTED.

HIZ001>004-006>008-012-013-020-212045-
/O.CAN.PHFO.SU.Y.0021.000000T0000Z-070423T0400Z/
NIIHAU-KAUAI WINDWARD-KAUAI LEEWARD-KAUAI MOUNTAINS-WAIANAE COAST-
OAHU NORTH SHORE-OAHU KOOLAU-MOLOKAI WINDWARD-MOLOKAI LEEWARD-
WINDWARD HALEAKALA-
941 AM HST SAT APR 21 2007

...HIGH SURF ADVISORY IS CANCELLED...

SURF ALONG NORTH FACING SHORES WILL BE 10 TO 14 FEET TODAY.

SURF ALONG WEST FACING SHORES WILL BE 6 TO 10 FEET TODAY.

$$
POWELL

Nearby

High Surf Advisories in Hawaii, 2007 Every high surf advisory in 2007

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.