095
FXHW01 KWNH 190828
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
428 AM EDT FRI JUN 19 2026
VALID 00Z SAT 20 JUN 2026 - 00Z SAT 27 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
UNTIL EARLY-TO-MID NEXT WEEK. AS THE INITIAL UPPER TROUGH
CONTINUES TO BE POSITIONED TO THE NORTH OF THE STATE, THE SURFACE
BOUNDARY IS EXPECTED TO REMAIN IN PLACE AND DRIFT CLOSER TO THE
ISLANDS AS SHORTWAVE ENERGY MOVING THROUGH THE WESTERLIES PROVIDES
UPPER- LEVEL SUPPORT TO AMPLIFY ANOTHER TROUGH NORTH-NORTHEAST OF
THE STATE BY TUESDAY. THIS CONFIGURATION MAY FAVOR A SHIFT TO A
MORE NORTHEASTERLY FLOW OVER THE ISLANDS EARLY NEXT WEEK. BY LATE
IN THE FORECAST PERIOD, THE AFOREMENTIONED TROUGH MAY CUT OFF
AND SINK SOUTHWARD AS THE SUBTROPICAL JET ALSO LIFTS NORTH. THIS
MAY LEAD TO ADDITIONAL RAIN CHANCES BY LATE WEEK.
SNELL
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