High Seas Forecast
Issued by NWS

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FZPN40 PHFO 210329
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
0500 UTC FRI JUL 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 21 2017.
24 HOUR FORECAST VALID 0000 UTC JUL 22 2017.
48 HOUR FORECAST VALID 0000 UTC JUL 23 2017.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM FERNANDA 18.3N 140.9W MOVING W 10 KT. MAXIMUM
SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS
WITHIN 70 NM NW...70 NM NE...40 NM SE AND 30 NM SW QUADRANTS.
SEAS 12 FT OR GREATER WITHIN 110 NM NW...130 NM NE...100 NM
SE...80 NM SW QUADRANTS WITH SEAS TO 18 FT. ELSEWHERE E OF LINE
12N140W 20N150W 26N143W 23N140W WINDS 20 TO 33 KT. SEAS 8 TO 12
FT E OF LINE 12N140W 20N154W 26N140W.
.24 HOUR FORECAST TROPICAL DEPRESSION FERNANDA 19.3N 144.8W.
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT. SEAS 12 FT OR GREATER
WITHIN 90 NM OF CENTER N SEMICIRCLE WITH SEAS TO 15 FT. SEAS 8 TO
12 FT ELSEWHERE BOUNDED BY 25N145W 20N140W 12N147W 18N158W
25N145W.
.48 HOUR FORECAST POST TROPICAL REMNANT LOW FERNANDA NEAR 21N
148W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. SEAS 8 TO 12 FT
BOUNDED BY 27N147W 24N142W 18N152W 22N153W 27N147W.

.72 HOUR FORECAST POST TROPICAL REMNANT LOW FERNANDA NEAR 22N
153W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. SEAS 8 TO 10 FT
BOUNDED BY 26N150W 25N145W 22N153W 26N150W.

FORECAST WINDS AROUND TROPICAL CYCLONES SHOULD BE USED WITH
CAUTION DUE TO FORECAST UNCERTAINTY.48

...GALE WARNING...
.LOW 25N177E 1012 MB MOVING W 05 KT. TROUGH FROM LOW TO 20N173E
17N168E. WINDS 30 TO 40 KT WITHIN 360 NM OF CENTER N QUADRANT.
WINDS 20 TO 30 KT ELSEWHERE N OF LINE 30N175W 22N178E 25N174E
30N170E. SEAS 12 TO 17 FT N OF 24N BETWEEN 177W AND 171E...SEAS 8
TO 12 FT ELSEWHERE N OF LINE 30N173W 20N172E 26N160E. SCATTERED
MODERATE TSTMS N OF 25N BETWEEN 173W AND 177E.
.24 HOUR FORECAST LOW MOVED N OF AREA. WINDS 20 TO 30 KT N OF
LINE 30N179E 28N178E 30N168E.
.48 HOUR FORECAST LOW N OF AREA. WINDS 20 TO 30 KT N OF LINE
30N171E 28N170E 28N164E 30N166E.

.SYNOPSIS AND FORECAST.

.T.D. NORU W OF AREA. SE WINDS 20 TO 25 KT NW OF LINE 30N165E
26N160E. ISOLATED MODERATE TSTMS W OF LINE 28N160E 22N165E
23N160E. SEE SEAS WITH GALE DESCRIBED ABOVE.
.24 HOUR FORECAST NORU MOVED FAR W OF AREA. WINDS DIMINISHED TO
20 KT OR LESS.

.ITCZ 10N140W 06N160W 07N175E 05N162E. SCATTERED MODERATE TO
STRONG TSTMS WITHIN 150 NM OF ITCZ W OF 178W.

.SEAS 8 TO 9 FT FROM 14N TO 07N BETWEEN 155W AND 165W AND S OF
LINE 00N140W 04N143W 00N152W
.24 HOUR FORECAST SEAS 8 FT FROM 12N TO 06N BETWEEN 160W AND 170E
AND S OF LINE 00N142W 04N145W 00N150W.
.48 HOUR FORECAST SEAS 8 TO 9 FT S OF LINE 00N158W 05N150W
00N170W. SEAS 8 FT FROM 09N TO 06N BETWEEN 167W AND 173W.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

$$
.HONOLULU FORECASTER.



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