971
FXHW01 KWNH 220752
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
352 AM EDT TUE JUL 22 2025
VALID 00Z WED 23 JUL 2025 - 00Z WED 30 JUL 2025
THE MAIN SUBTROPICAL SURFACE HIGH OVER THE EASTERN PACIFIC WILL BE
POSITIONED WELL NORTH OF THE ISLANDS THIS WEEK, GENERALLY BETWEEN
40 AND 45 DEGREES NORTH. THE STATE WILL BE ON THE FAR SOUTHERN
PERIPHERY OF THIS HIGH, AND THIS WILL KEEP A GENERAL EASTERLY LOW
LEVEL FLOW IN PLACE, WITH SOME BACKING TO THE NORTHEAST AT TIMES
THROUGH THE PERIOD. THE MODELS AGREE THAT THE OVERALL PRESSURE
GRADIENT WILL WEAKEN A LITTLE GOING INTO THE MIDDLE TO END OF THE
WEEK, AND A LIGHTER TRADE WIND FLOW AS A RESULT. THE ENSEMBLE
MEANS ARE IN GOOD SYNOPTIC SCALE AGREEMENT ON THE OVERALL PATTERN.
IN TERMS OF RAINFALL PROSPECTS, THE NORMAL TRADE WIND INDUCED
SHOWERS CAN BE EXPECTED THROUGH THE REMAINDER OF THE WEEK WITH NO
MAJOR RAINFALL EVENTS EXPECTED. HOWEVER, THERE MAY BE A SLIGHT
INCREASE IN SHOWERS ACROSS THE BIG ISLAND OVER THE WEEKEND AS A
WEAK TROPICAL WAVE APPROACHES FROM THE EAST.
HAMRICK
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