268
FXHW01 KWNH 200717
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
317 AM EDT FRI MAR 20 2026
VALID 00Z SAT 21 MAR 2026 - 00Z SAT 28 MAR 2026
..PROLONGED WET PATTERN TO CONTINUE INTO MONDAY ACROSS HAWAI'I
THE GUIDANCE AGREES ON UPPER LEVEL TROUGHING WAXING AND WANING
OVER HAWAI'I DURING THE NEXT WEEK, THOUGH THE DEGREE OF TROUGHING
LATE NEXT WEEK REMAINS AN OPEN QUESTION -- THE 00Z GFS MAY BE A
TOO EMPHATIC/TOO FAR SOUTH WITH AN UPPER LEVEL LOW AT THAT TIME
RANGE.
THE ATTENDANT FRONT OF A NEARBY SURFACE LOW SWEEPS FROM WEST TO
EAST ACROSS THE MAIN ISLANDS FROM TODAY INTO MONDAY AS THE PARENT
CYCLONE ESCAPES INTO THE NORTHEAST PACIFIC. THIS SYSTEM CONTINUES
TO DISRUPT TRADES IN THE SHORT TERM AND BRINGS PERIODS OF
HEAVY/EXCESSIVE RAINFALL WHICH SUPPORTS THE RISK OF LIFE-
THREATENING FLASH FLOODING AND LANDSLIDES OVER GROUND SATURATED BY
RECENT PROLIFIC RAINS. AS SURFACE RIDGING BUILDS FROM TUESDAY
ONWARD TO THE NORTH AND NORTHEAST, RAIN CHANCES/AMOUNTS FADE AS
TRADE WINDS RETURN.
ROTH
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