920
FXHW01 KWNH 120740
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
340 AM EDT TUE MAY 12 2026
VALID 00Z WED 13 MAY 2026 - 00Z WED 20 MAY 2026
A STABLE SYNOPTIC PATTERN IS EXPECTED TO PERSIST THROUGH THE
UPCOMING FORECAST PERIOD, HIGHLIGHTED BY ROBUST SURFACE RIDGING
NORTH OF THE STATE. AT THE START OF PERIOD, DEEP RIDGING WILL
SUPPORT FRESH EASTERLY TRADE WIND FLOW ACROSS THE ISLAND CHAIN.
SURFACE HIGH PRESSURE IS EXPECTED TO GRADUALLY SHIFT EAST MID TO
LATE WEEK, THOUGH EASTERLY FLOW WILL PREVAIL ACROSS THE STATE INTO
EARLY NEXT WEEK. IN THE UPPER LEVELS, THE HIGH WILL ALSO SHIFT
EAST, RESULTING IN A DEVELOPING WEAKNESS IN THE RIDGE ACROSS THE
STATE. A WEAK UPPER LEVEL LOW IS FORECAST TO DROPS SOUTH INTO
ISLANDS LATE IN THE WEEK AND LINGER INTO THE WEEKEND BEFORE
DRIFTING EAST EARLY NEXT WEEK. WHILE THE OVERALL SURFACE PATTERN
REMAINS STABLE, THIS FEATURE MAY PROVIDE ENOUGH MID-LEVEL COOLING
TO WEAKEN THE TRADE WIND INVERSION AND HELP ORGANIZE OR ENHANCE
PASSING SHOWERS. OTHERWISE, PRECIPITATION WILL BE MOSTLY CHARACTERIZED
BY LIGHT PASSING SHOWERS EMBEDDED IN THE TRADES AND FOCUSED
ALONG THE WINDWARD SLOPES AND MAUKA AREAS.
PEREIRA
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