137
FXHW01 KWNH 170916
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
516 AM EDT WED JUN 17 2026
VALID 00Z THU 18 JUN 2026 - 00Z THU 25 JUN 2026
AN UPPER-LEVEL TROUGH LOCATED TO THE NORTH OF THE ISLANDS AT THE
START OF THE PERIOD AND A SURFACE FRONT POSITIONED WELL TO THE
NORTHWEST WILL COMBINE TO DISRUPT THE TYPICAL TRADE WIND
INVERSION, RESULTING IN LIGHT SURFACE WINDS ACROSS THE REGION.
THIS PATTERN WILL COEXIST WITH ABOVE-NORMAL MOISTURE FROM A WEAK
WAVE OR INVERTED TROUGH PASSING ACROSS THE ISLANDS EARLY ON.
ALTHOUGH THE INITIAL UPPER TROUGH LIFTS OUT TO THE NORTH, THE
SURFACE BOUNDARY IS EXPECTED TO REMAIN IN PLACE AND MAY DRIFT
CLOSER TO THE ISLANDS AS SHORTWAVE ENERGY MOVING THROUGH THE
WESTERLIES PROVIDES UPPER-LEVEL SUPPORT TO AMPLIFY ANOTHER TROUGH
NORTH OF THE STATE. THIS CONFIGURATION MAY FAVOR A SHIFT TO A
MORE NORTHEASTERLY FLOW OVER THE ISLANDS EARLY NEXT WEEK.
EVENTUALLY THE FRONT IS FORECAST TO WEAKEN AND PUSH BACK TO THE
WEST, ALLOWING A RETURN OF MORE TYPICAL EASTERLY TRADES AS SURFACE
RIDGING BUILDS BACK IN BY THE MIDDLE OF NEXT WEEK.
PEREIRA
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