427
FXHW01 KWNH 210845
PMDHI
HAWAII EXTENDED FORECAST DISCUSSION
NWS WEATHER PREDICTION CENTER COLLEGE PARK MD
445 AM EDT FRI AUG 21 2026
VALID 00Z SAT 22 AUG 2026 - 00Z SAT 29 AUG 2026
TROPICAL DEPRESSION TWO-C WILL CONTINUE TO TRACK WEST-NORTHWEST
ACROSS THE CENTRAL PACIFIC THROUGH THE LATTER PART OF THE WEEKEND
BEFORE PASSING SOUTH OF THE ISLANDS SUNDAY AND MONDAY. EVEN
THOUGH THE CENTER OF THE SYSTEM IS FORECAST TO REMAIN WELL SOUTH
OF THE STATE, A STRONG PRESSURE GRADIENT BETWEEN THE STORM AND
HIGH PRESSURE ANCHORED TO THE NORTH WILL SUPPORT STRONG EASTERLY
WINDS SPREADING WEST ACROSS THE ISLANDS ON SUNDAY. IN ADDITION TO
THE WINDS, A DEEP MOISTURE PLUME OF MOISTURE POSITIONED NORTH OF
THE SYSTEM WILL FUEL HEAVY RAINFALL, ESPECIALLY OVER THE EASTERN
ISLANDS, WITH PARTS OF THE BIG ISLAND LIKELY TO SEE SEVERAL
INCHES. WITH THESE RAINS COMING QUICKLY ON THE HEELS OF LALA,
LIFE-THREATENING FLOODING AND MUDSLIDES ARE AN ESPECIAL CONCERN.
EVEN AS THE SYSTEM CONTINUES WEST, GUIDANCE SHOW THE
AFOREMENTIONED MOISTURE PLUME LINGERING ACROSS THE STATE,
POTENTIALLY CARRYING THE HEAVY RAINFALL THREAT INTO EARLY NEXT
WEEK.
BY MIDWEEK, A RETURN TO MORE TYPICAL EASTERLY TRADES IS EXPECTED
AND THEY WILL LIKELY CONTINUE THROUGH THE REMAINDER OF THE
PERIOD.
PEREIRA
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