649
FXHW01 KWNH 300808
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
308 AM EST TUE DEC 30 2025
VALID 00Z WED 31 DEC 2025 - 00Z WED 07 JAN 2026
THE NORTHEASTERLY TRADE WINDS WILL BE ONGOING ALONG THE ARCHIPELAGO
AT THE START OF THE PERIOD THIS AFTERNOON. THE FLOW WILL WEAKEN INTO
NEW YEAR'S DAY AS A SHEARING OUT COLD FRONT APPROACHES FROM THE
NORTH. THE FRONT WILL OVERSPREAD THE ENTIRE CHAIN ON FRIDAY,
RESULTING IN BOTH SIDES OF THE ISLANDS HAVING CHANCES FOR LIGHT
RAIN. THE FRONT WILL CONTINUE WEAKENING AS IT PASSES SOUTHWEST OF
THE ISLANDS. BEHIND THE FRONT, SURFACE RIDGING WILL REESTABILISH
ITSELF NORTHEAST OF THE ISLANDS, RESULTING IN THE NORTHEAST TRADES
RESUMING SUNDAY INTO MONDAY. THE NORTHEAST FACING COASTS OF THE
ISLANDS WILL RETURN TO OFF-AND-ON RAINFALL ACTIVITY AS WEAK IMPULSES
MOVE THROUGH THE BROADER FLOW PATTERN, AS THE LEE/SOUTHWEST SIDES OF
THE ISLANDS RETURN TO A DRY PATTERN. THE EC AND GFS LARGELY AGREE ON
THE DETAILS OF THE ABOVE-DESCRIBED WEATHER PATTERN. HOWEVER, THE EC
IS SLOWER TO REESTABILISH THE NORTHEAST TRADES AS THE SUBTROPICAL
HIGH DRIVING THE TRADES REMAINS LARGELY NORTH OF THE ISLANDS INTO
EARLY NEXT WEEK. THIS IN TURN WOULD MEAN DRIER CONDITIONS FOR THE
WINDWARD SIDE OF THE ISLANDS UNTIL THE HIGH IS ABLE TO MOVE FARTHER
EAST BY MIDWEEK.
WEGMAN
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