141
FXHW01 KWNH 250739
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
339 AM EDT FRI SEP 25 2026
VALID 00Z SAT 26 SEP 2026 - 00Z SAT 03 OCT 2026
...HEAVY RAIN AND FLOOD THREAT GROWING ESPECIALLY FOR THE BIG
ISLAND AS NOLO STRENGTHENS AND STARTS APPROACHING SLOWLY...
HEAVY RAIN LIKELY FOR THE BIG ISLAND TODAY AS HURRICANE NOLO
APPROACHES FROM THE SOUTH. THIS WILL LEAD TO THE POSSIBILITY OF
LIFE-THREATENING, CATASTROPHIC FLOODING AND MUDSLIDES, ESPECIALLY
IN AREAS OF STEEP TERRAIN OF THE BIG ISLAND AND MAUI THROUGH THE
WEEKEND. ACROSS THE REMAINDER OF HAWAII LESSER RAINFALL AMOUNTS
ARE EXPECTED WITH CONCERNS FOR ISOLATED FLOODING.
MUCH UNCERTAINTY REMAINS ABOUT THE ACTUAL TRACK OF THE STORM GIVEN
POTENTIAL INTERACTIONS WITH A TROUGH TO THE NORTHWEST AND HIGH
PRESSURE TO THE EAST. THE SEVERITY OF THE HEAVY RAINFALL,
FLOODING, MUDSLIDES AND DAMAGING WINDS WILL BE DEPENDENT ON HOW
CLOSE THE STORM GETS TO THE ISLANDS.
ALWAYS REFER TO THE ADVISORIES/STATEMENTS FROM THE NATIONAL
HURRICANE CENTER FOR LATEST INFORMATION.
ONCE THE CYCLONE PULLS AWAY... A RETURN TO MODERATE TRADE WIND
PATTERN DEVELOPS NEXT WEEK AND RAINFALL BECOME MORE DRIVEN BY
INTERACTION OF THE TRADES WITH TERRAIN AS HIGHER MOISTURE VALUES
LOOK TO CLEAR OUT. EXACTLY WHEN THAT RETURN TO A MORE NORMAL TRADE
PATTERN IS MORE UNCERTAIN GIVEN THE INTERACTIONS NOTED ABOVE WITH
TROUGHING TO THE NORTH/WEST OF HAWAII AND THE SUBTROPICAL RIDGE TO
THE EAST.
CAMPBELL/BANN
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