The High Seas Forecast for the Central North Pacific

Major Winter Storm Ongoing in the Upper Midwest; Severe Weather Tonight from the Mid-South to the Ohio Valley

A major winter storm will continue to bring blizzard conditions, heavy snowfall, icing, and strong winds through Monday across the Upper Midwest and Upper Great Lakes. A line of storms will be capable of producing widespread damaging winds, tornadoes, and some large hail from the Mid-South to the Ohio Valley and the Southeast through tonight, moving into the Mid-Atlantic Monday. Read More >

838 FZPN40 PHFO 162243 HSFNP HIGH SEAS FORECAST NATIONAL WEATHER SERVICE HONOLULU HI 2300 UTC MON MAR 16 2026 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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 180W SYNOPSIS VALID 1800 UTC MAR 16 2026. 24 HOUR FORECAST VALID 1800 UTC MAR 17 2026. 48 HOUR FORECAST VALID 1800 UTC MAR 18 2026. .WARNINGS. .NONE. .SYNOPSIS AND FORECAST. .TROUGH 30N147W 19N156W 17N167W MOVING E SLOWLY. ISOLATED MODERATE TSTMS FROM 27N TO 22N BETWEEN 151W AND 146W. .24 HOUR FORECAST TROUGH 30N146W 24N148W 16N160W. .48 HOUR FORECAST FRONT 30N145W 27N148W THENCE TROUGH 22N151W 17N157W. .FRONT 30N151W 24N159W MOVING E 10 KT. WINDS 20 TO 25 KT N OF FRONT. .24 HOUR FORECAST FRONT 30N149W 25N155W 23N158W. .48 HOUR FORECAST FRONT MERGED WITH TROUGH DIRECTLY DESCRIBED ABOVE. .WARM FRONT 22N180W 20N176W MOVING NE 10 KT. .24 HOUR FORECAST NEW OCCLUDED FRONT 27N180W 24N175W THENCE NEW COLD FRONT 19N180W. WARM FRONT FROM OCCLUDED FRONT TO 22N172W. WINDS 20 TO 25 KT N OF LINE 30N174W 25N172W 28N180W. .48 HOUR FORECAST FORECAST NEW LOW NEAR 25N171W 1007 MB. WARM FRONT FROM LOW TO 27N161W. COLD FRONT FROM LOW TO 20N174W TO 17N180W. OCCLUDED FRONT MOVED N OF AREA. WINDS 20 TO 25 KT N OF 25N W OF 163W. .TROUGH 08N174W 08N180W NEARLY STATIONARY. ISOLATED MODERATE TSTMS FROM 08N TO 04N BETWEEN 175W AND 170W. .24 HOUR FORECAST TROUGH DISSIPATED. .WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA. .SEAS 2.5 TO 4 M N OF LINE 30N144W 10N161W 10N180W. .24 HOUR FORECAST SEAS 2.5 TO 4.5 M N OF LINE 30N144W 22N161W 03N168W 04N174W 18179W 15N180W. .48 HOUR FORECAST SEAS 4 TO 5 M N OF 25N W OF 170W. SEAS 2.5 TO 4 M ELSEWHERE N OF LINE 30N144W 21N152W 22N159W 14N160W 14N180W. .SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA. .ITCZ 02N140W 02N161W 01N172W. ISOLATED MODERATE TSTMS WITHIN 180 NM N OF ITCZ E OF 153W. $$ .FORECASTER TROTTER. HONOLULU HI.