The High Seas Forecast for the Central North Pacific

Severe Weather and Heavy Rainfall Potential for the Plains; Coastal Low Across the mid-Atlantic

An upper trough and frontal boundary will focus showers and thunderstorms across portions of the Plains through early Monday; A few severe thunderstorms along with heavy rainfall are expected. Meanwhile, low pressure off the Southeast Coast will bring inclement weather across the mid-Atlantic coast through Monday. This system is forecast to meander off the coast then track inland early this week. Read More >

272 FZPN40 PHFO 181523 HSFNP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 1700 UTC THU SEP 18 2025 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 SEP 18 2025. 24 HOUR FORECAST VALID 1200 UTC SEP 19 2025. 48 HOUR FORECAST VALID 1200 UTC SEP 20 2025. .WARNINGS. ...GALE WARNING... .LOW NEAR 22N163E 1011 MB MOVING WNW 10 KT. WINDS 30 TO 35 KT WITHIN 60O NM NE QUADRANT OF LOW. WINDS 20 TO 30 KT ELSEWHERE WITHIN 150 NM E SEMICIRCLE OF LOW. SCATTERED MODERATE TO STRONG TSTMS WITHIN 150 NM OF LOW CENTER. .24 HOUR FORECAST LOW MOVED W OF AREA. .SYNOPSIS AND FORECAST. .WEAKENING FRONT 27N140W 26N147W 28N154W MOVING SSW SLOWLY. ISOLATED MODERATE TSTMS WITHIN 60 NM OF FRONT W OF 148W. .24 HOUR FORECAST FRONT WEAKENED TO TROUGH 25N140W 25N153W 30N157W. WINDS EASED TO 20 KT OR LESS. SEAS 2.5 TO 3 M N OF TROUGH E OF 145W. .48 HOUR FORECAST TROUGH DISSIPATED. .TROUGH 10N158W 13N158W 16N157W MOVING W SLOWLY. WINDS 20 TO 25 KT WITHIN 240 NM NW OF TROUGH FROM 14N TO 18N. SEAS 2.5 TO 3 M FROM 14N TO 19N BETWEEN 155W TO 162W. SCATTERED MODERATE TSTMS WITHIN 210 NM OF TROUGH. .24 HOUR FORECAST TROUGH 10N163W 16N163W. .48 HOUR FORECAST TROUGH DISSIPATED. .WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA. .48 HOUR FORECAST SEAS 2.5 TO 3 M N OF 24N E OF 150W. .SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA. .MONSOON TROUGH 10N140W 10N148W. .ITCZ 11N150W TO TROUGH ABOVE TO 13N160W 09N168E 06N160E. ISOLATED MODERATE TSTMS WITHIN 90 NM EITHER SIDE OF ITCZ. $$ .FORECASTER BLOOD. HONOLULU HI.