High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 270335
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC THU JUL 27 2017

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS

SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT
OF THE HIGHEST 1/3 OF THE WAVES. INDIVIDUAL WAVES MAY BE MORE THAN
TWICE THE SIGNIFICANT WAVE HEIGHT.

THIS HIGH SEAS FORECAST USES 1-MINUTE AVERAGE WINDS WHICH MAY BE
HIGHER THAN 10-MINUTE AVERAGE WINDS.

SECURITE

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 0000 UTC JUL 27 2017.
24 HOUR FORECAST VALID 0000 UTC JUL 28 2017.
48 HOUR FORECAST VALID 0000 UTC JUL 29 2017.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW...FORMER TROPICAL CYCLONE GREG...NEAR 19N143W 1009 MB MOVING
WSW 10 KT. WINDS 20 TO 25 KT AND SEAS 8 TO 10 FT WITHIN 180 NM NW
SEMICIRCLE...90 NM SE SEMICIRCLE. ISOLATED MODERATE TO STRONG
TSTMS WITHIN 90 NM OF CENTER.
.24 HOUR FORECAST LOW NEAR 17N146W. WINDS 20 TO 25 KT AND
SEAS 8 TO 10 FT WITHIN 90 NM NW SEMICIRCLE.
.48 HOUR FORECAST LOW DISSIPATED. TROUGH FROM 15N150W TO
19N148W. ASSOCIATED WINDS DIMINISHED TO 20 KT OR LESS AND
SEAS SUBSIDED TO 8 FT OR LOWER.

.LOW NEAR 25N174E 1010 MB MOVING N 10 KT. WINDS 20 TO 30 KT
AND SEAS 8 TO 10 FT WITHIN 90 NM AND 240 NM OF LOW CENTER E AND
NE QUADRANTS. SCATTERED MODERATE TO STRONG TSTMS N OF 20N BETWEEN
172E AND 174W.
.24 HOUR FORECAST LOW NEAR 27N174E 1012 MB. WINDS 20 TO 25 KT
AND SEAS 8 TO 9 FT WITHIN 90 NM AND 240 NM OF LOW CENTER E AND
NE QUADRANTS.
.48 HOUR FORECAST LOW MERGED WITH DEVELOPING LOW DESCRIBED
IMMEDIATELY BELOW. ASSOCIATED WINDS AND SEAS DESCRIBED
IMMEDIATELY BELOW.

.TROUGH FROM 27N160E TO 28N166E. WINDS SW TO SE 20 TO 25 KT N
OF 20N W OF 165E. SEAS 8 TO 12 FT N OF 25N W AND NW OF A LINE
FROM 30N170E TO 22N160E. SCATTERED STRONG TSTMS W AND NW OF A
LINE FROM 30N168E 23N168E 17N160E.
.24 HOUR FORECAST DEVELOPING LOW NEAR 28N166E 1010 MB. TROUGHS
FROM LOW TO 29N168E AND FROM LOW TO 27N160E. WINDS SE TO SW 20
TO 25 KT N OF 23N W OF 165E. SEAS 8 TO 9 FT N OF 23N W OF 165E.
.48 HOUR FORECAST LOW NEAR 29N168E 1008 MB. TROUGH FROM LOW TO
27N160E. WINDS 20 TO 30 KT WITHIN 180 NM OF LOW. WIND SW 20 TO
25 KT ELSEWHERE WITHIN 180 NM S AND SE OF TROUGH AXIS. SEAS
8 TO 12 FT WITHIN 180 NM OF LOW E SEMICIRCLE. SEAS 8 TO 9 FT
ELSEWHERE WITHIN 150 NM OF TROUGH AXIS.

.RIDGE DEVELOPING OVER FORECAST AREA.
.48 HOUR FORECAST RIDGE FROM 21N179E TO 15N160E.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 11N142W TO 08N150W TO 10N160W TO 07N170W TO 09N178E.
SCATTERED MODERATE TO STRONG TSTMS WITHIN 300 NM N OF CONVERGENCE
LINE E OF 160W. ISOLATED MODERATE TSMTS ELSEWHERE WITHIN 150 NM
OF CONVERGENCE LINE.

.OTHERWISE SCATTERED MODERATE TO STRONG TSTMS S OF 06N W OF 179W.
ISOLATED MODERATE TSTMS FROM 27N TO 21N BETWEEN 172W AND 162W.

$$

.FORECASTER BEDAL. HONOLULU HI.


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