587
FXHW01 KWNH 080745
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
345 AM EDT SAT AUG 8 2026
VALID 00Z SUN 09 AUG 2026 - 00Z SUN 16 AUG 2026
THE TRADE WINDS STRENGTHEN AS AN UPPER LEVEL TROUGH RETROGRADES
AWAY FROM THE NORTHWESTERN MAIN ISLANDS THROUGH THE
PAPAHANAUMOKUAKEA MARINE NATIONAL MONUMENT AND A WARM CORE RIDGE
STRENGTHENS/BROADENS TO THE NORTHEAST. THE STRONGER TRADES ARE
EXPECTED TO CONTINUE THROUGH NEXT WEEK.
A DISTURBANCE IN THE TROPICAL EASTERLIES TO THE SOUTH OF THE
SUBTROPICAL RIDGE INCREASES MOISTURE THIS WEEKEND WHICH SHOULD
INCREASE HEAVY RAIN POTENTIAL PRIMARILY ON THE ISLAND OF HAWAI'I.
A DEVELOPING/STRENGTHENING TROPICAL CYCLONE IS FORECAST TO MOVE
SOUTH OF THE STATE AT THE END OF NEXT WEEK, BRINGING A POSSIBLE
SURGE IN THE EASTERLIES AND A HEAVY RAIN THREAT TO THE ISLAND OF
HAWAI'I NEXT FRIDAY OR SATURDAY -- SEE NATIONAL HURRICANE CENTER
TROPICAL WEATHER OUTLOOKS FOR MORE ON THIS IMPENDING SYSTEM.
BETWEEN SYSTEMS, MAUKA SHOWERS ARE EXPECTED.
ROTH
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