High Seas Forecast
Issued by NWS

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FZPN40 PHFO 031645
HSFNP

HIGH SEAS FORECAST
NATIONAL WEATHER SERVICE HONOLULU HI
1700 UTC MON AUG 03 2015

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC AUG 03 2015.
24 HOUR FORECAST VALID 1200 UTC AUG 04 2015.
48 HOUR FORECAST VALID 1200 UTC AUG 05 2015.

.WARNINGS.
...TROPICAL STORM WARNING...
.TROPICAL STORM GUILLERMO NEAR 16.6N 146.1W AT 03/1500 UTC MOVING
WNW 09 KT. MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM
FORCE WINDS WITHIN 110 NM NE...100 NM SE...50 NM SW...75 NM NW
QUADRANTS. SEAS 12 FT OR GREATER WITHIN 280 NM NE...190 NM SE...220
NM SW...280 NM NW QUADRANTS. WINDS 20 TO 33 KT ELSEWHERE WITHIN 300
NM N SEMICIRCLE...AND WITHIN 120 NM S SEMICIRCLE. SEAS 8 TO 12 FT
ELSEWHERE FROM 10N TO 25N E OF 153W. SCATTERED MODERATE O STRONG
TSTMS WITHIN 200 NM NE QUADRANT OF CENTER.
.24 HOUR FORECAST TROPICAL STORM GUILLERMO NEAR 17.9N 148.8W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 90 NM NE...80 NM SE...40 NM SW...60 NM NW QUADRANTS.
WINDS 20 TO 33 KT ELSEWHERE WITHIN 260 NM N SEMICIRCLE...AND WITHIN
100 NM ELSEWHERE. SEAS 8 TO 12 FT ELSEWHERE FROM 15N TO 27N BETWEEN
154W AND 145W.
.48 HOUR FORECAST TROPICAL STORM GUILLERMO NEAR 19.6N 152.2W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE
WINDS WITHIN 80 NM NE...60 NM SE...30 NM SW...55 NM NW QUADRANTS.
WINDS 20 TO 33 KT ELSEWHERE WITHIN 230 NM N SEMICIRCLE...AND WITHIN
80 NM S ELSEWHERE. SEAS 8 TO 12 FT ELSEWHERE FROM 17N TO 28N BETWEEN
157W AND 148W.
.72 HOUR FORECAST TROPICAL STORM GUILLERMO NEAR 21.4N 155.9W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT.
.EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM GUILLERMO NEAR 23.1N 159.9W.
MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION GUILLERMO NEAR 25.0N 164.1W.
MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.

.FORECAST WINDS NEAR TROPICAL CYCLONES SHOULD BE USED WITH CAUTION
DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND INTENSITY.

.SYNOPSIS AND FORECAST.

.LOW NEAR 14N163W 1008 MB WITH TROUGH TO 09N160W MOVING W 15 KT.
WINDS 20 TO 25 KT WITHIN 150 NM N SEMICIRCLE OF LOW. ISOLATED
MODERATE TSTMS WITHIN 120 NM OF LOW.
.24 HOUR FORECAST LOW DISSIPATED. TROUGH 14N167W TO 07N167W.
WINDS DIMINISHED TO 20 KT OR LESS.
.48 HOUR FORECAST TROUGH 14N173W TO 08N172W.

.LOW NEAR 13N176W 1008 MB MOVING W SLOWLY.  ISOLATED MODERATE TSTMS
WITHIN 200 NM NE QUADRANT.
.24 HOUR FORECAST LOW DISSIPATED.

.RELOCATED LOW 03N173E 1007 MB NEARLY STATIONARY. TROUGHS FROM LOW
TO 04N180W AND FROM LOW TO 05N165E. SCATTERED MODERATE TO STRONG
TSTMS S OF TROUGH AND LOW BETWEEN 172E AND 165E.
.24 HOUR FORECAST LOW AND TROUGH DISSIPATED.

.TROUGH 26N152W TO 21N153W MOVING W 15 KT.
.24 HOUR FORECAST TROUGH 26N156W TO 23N156W TO 20N157W.
.48 HOUR FORECAST TROUGH 27N161W TO 23N162W TO 20N162W.

.FRONT ALONG 30N BETWEEN 175E AND 170E NEARLY STATIONARY.
.24 HOUR FORECAST FRONT NO CHANGE.
.48 HOUR FORECAST FRONT MOVED N OF FORECAST AREA AS A WARM FRONT.

.RIDGE FROM 30N165W TO 26N180W TO 25N170E TO 28N160E NEARLY
STATIONARY.

.OTHERWISE WINDS 20 KT OR LESS AND SEAS 8 FT OR LESS OVER REMAINDER
OF AREA.

.SCATTERED TSTMS WITHIN 120 NM EITHER SIDE OF A LINE...25N180W TO
16N170E. ALSO...WIDELY SCATTERED TSTMS S OF 10N E OF 150W.

.ITCZ...FROM T.S. GUILLERMO TO 10N150W TO 08N156W TO 02N168W.
SCATTERED TSTMS WITHIN 270 NM N OF ITCZ W OF 160W.

$$
.FORECASTER LAU. HONOLULU HI





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