High Seas Forecast
Issued by NWS

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000
FZPN40 PHFO 260342
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC WED JUL 26 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 26 2017.
24 HOUR FORECAST VALID 0000 UTC JUL 27 2017.
48 HOUR FORECAST VALID 0000 UTC JUL 28 2017.

.WARNINGS.

...TROPICAL STORM WARNING...
.TYPHOON NORU JUST W OF FCST AREA NEAR 28.1N 157.9E 967 MB MOVING
NW 12 KT. WINDS 34 TO 45 KT OVER FORECAST WATERS WITHIN 145 NM NE
QUADRANT...125 NM SE QUADRANT. WINDS SE TO SW 20 TO 33 KT
ELSEWHERE W OF A LINE FROM 30N166E TO 23N163E TO 19N160E. SEAS 12 FT
OR GREATER OVER FORECAST WATERS WITHIN 240 NM NE QUADRANT...480 NM
SE QUADRANT. SEAS 8 TO 12 FT ELSEWHERE W OF A LINE FROM 30N167E TO
21N167E TO 16N160E. SCATTERED SCATTERED MODERATE TO STRONG TSTMS
W OF A LINE FROM 30N166E TO 23N163E TO 19N160E.
.24 HOUR FORECAST TYPHOON NORU JUST W OF FORECAST AREA NEAR 30.7N
153.1E. WINDS SE TO SW 20 TO 33 KT W OF A LINE FROM 30N164E TO
23N163E TO 20N160E. SEAS 8 TO 12 FT OVER FORECAST WATERS N OF 27N
W OF 165E.
.48 HOUR FORECAST TYPHOON NORU FAR W OF FCST AREA. ASSOCIATED TROUGH
FROM 26N160E TO 29N168E. WINDS SE TO SW 20 TO 30 KT AND SEAS 8 TO
10 FT OVER FORECAST WATERS W OF A LINE FROM 30N163E TO 26N166E TO
21N160E.

SEE ADVISORY WTPN31 PGTW FROM JTWC FOR ADDITIONAL DETAILS.

.SYNOPSIS AND FORECAST.

.TROPICAL DEPRESSION GREG JUST E OF FCST AREA NEAR 17.2N 138.8W AT
26/0300Z MOVING NW 12 KT. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT
NEAR CENTER. WINDS OVER FORECAST WATERS INCREASING TO NW TO N 20
TO 30 KT FROM 20N TO 15N E OF 144W.
.24 HOUR FORECAST POST TROPICAL REMNANT LOW NEAR 18.2N 141.2W.
MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. WINDS 20 TO 25 KT FROM
20N TO 15N E OF 147W.
.48 HOUR FORECAST POST TROPICAL REMNANT LOW NEAR 17.0N 147.6W.
MAXIMUM SUSTAINED WINDS 20 KT GUSTS 30 KT.

.LOW NEAR 24N172E 1010 MB MOVING ENE 10 KT. TROUGH FROM LOW TO
27N177E TO 30N178E. WINDS SE TO NE 20 TO 25 KT N OF 27N WITHIN 90 NM
EITHER SIDE OF TROUGH AXIS. SCATTERED STRONG TSTMS WITHIN 300 NM E
AND SE OF TROUGH AXIS.
.24 HOUR FORECAST LOW NEAR 25N174E 1012 MB. TROUGH FROM LOW TO
30N178E. WINDS SE TO NE 20 TO 25 KT WITHIN 90 NM EITHER SIDE OF
TROUGH AXIS.
.48 HOUR FORECAST DISSIPATING LOW NEAR 26N176E 1014 MB. ASSOCIATED
WINDS DIMINISHED TO 20 KT OR LESS.

.TROUGH FROM 21N165W TO 25N164W TO 28N161W MOVING WNW 15 KT.
ISOLATED MODERATE TSTMS FROM 30N TO 20N BETWEEN 165W AND 158W.
.24 HOUR FORECAST TROUGH DISSIPATED.

.RIDGE FROM 25N171W TO 20N179W TO 16N170E.

.WINDS 20 KT OR LESS REMAINDER FORECAST AREA.

.OTHERWISE SEAS 8 TO 9 FT FROM 20N TO 10N E OF 147W.
.24 HOUR FORECAST SEAS 8 TO 9 FT FROM 20N TO 16N E OF 143W...AND
ALSO FROM 15N TO 10N BETWEEN 158W AND 150W.
.48 HOUR FORECAST SEAS 8 TO 9 FT FROM 20N TO 16N E OF 145W.

.SEAS 8 FT OR LOWER REMAINDER FORECAST AREA.

.ITCZ FROM 08N140W TO 08N152W TO 04N165W TO 04N177W TO 06N171E.
SCATTERED MODERATE TO STRONG TSTMS WITHIN 270 NM EITHER SIDE OF
AXIS OF CONVERGENCE.

.OTHERWISE ISOLATED MODERATE TO STRONG TSTMS S OF 12N W OF 171E.

$$

.FORECASTER BEDAL. HONOLULU HI.



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