158
NOHW40 PHFO 250031
PNSHFO
HIZ001-003-004-006-007-009>011-015>018-022-023-026>054-251245-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
231 PM HST TUE FEB 24 2026
..INTENSE RAINFALL CAUSES SIGNIFICANT FLOODING FOR OAHU
A VIGOROUS SHORT-WAVE TROUGH COMBINED WITH OROGRAPHIC LIFT FROM
THE KOOLAU MOUNTAIN RANGE AND SUFFICIENT LOW LEVEL MOISTURE
PRODUCED A NEARLY STATIONARY BAND OF HEAVY RAIN AND THUNDERSTORMS
OVER THE KOOLAU MOUNTAINS ON SATURDAY, FEBRUARY 21ST. THE HEAVIEST
RAIN OCCURRED BETWEEN MAUNAWILI AND HAUULA FOR AROUND 4 TO 6 HOURS
THAT MORNING, WITH INTENSE RAINFALL RATES OF 2 TO 4 INCHES PER HOUR
AND BRIEF PERIODS OF OVER 6 INCHES PER HOUR OBSERVED. THIS LED TO
RAPID RISES IN AREA STREAMS AND OVERWHELMED STORM WATER CHANNELS
AND DRAINS.
SIGNIFICANT FLASH FLOODING OCCURRED ALONG BOTH THE WINDWARD AND
LEEWARD SIDES OF THE MOUNTAIN RANGE, WITH THE MOST NOTABLE AND
WIDESPREAD IMPACTS IN THE KANEOHE, WAIAHOLE, WAIKANE, AND NORTH
SHORE AREAS. SEVERAL ROADS WERE CLOSED, INCLUDING THE LIKELIKE
HIGHWAY OFF-RAMP FROM THE KANEOHE-BOUND H-3 FREEWAY. WATER FROM
OVERFLOWED STREAMS ENTERED SEVERAL HOMES AND VEHICLES IN KANEOHE
AND INUNDATED THE OTAKE CAMP AREA OF WAIALUA.
NOTE: THE PREVIOUS 24-HOUR PRECIPITATION REPORT SUMMARY INCLUDED
AMOUNTS AS OF 5 PM HST ON THE 21ST, AND AS SUCH, INCLUDED RAINFALL
FROM THE PREVIOUS EVENING, SO THE VALUES MAY DIFFER FROM THE ONES
LISTED BELOW. MIDNIGHT TO MIDNIGHT WAS CHOSEN FOR THIS SUMMARY TO
CAPTURE THE MAIN PERIOD OF WIDESPREAD HEAVY RAINFALL. DATA IS
PRELIMINARY AND FOR INFORMATION PURPOSES ONLY.
HIGHEST 24-HOUR RAINFALL TOTALS (MIDNIGHT HST FEB 21ST TO MIDNIGHT HST
FEB 22ND) FOR THE ISLAND OF OAHU...
LOCATION AMOUNT (INCHES)
LULUKU (NWS/13016) 25.10
MOANALUA RG (USGS) 17.51
POAMOHO RG1 (USGS) 16.32
HEEIA NERR 11.25
TUNNEL RG (USGS) 9.04
ST. STEPHENS (NWS/13006) 8.74
MAUNAWILI (NWS/13008) 6.46
KAMANANUI STREAM (USGS) 6.31
OAHU FOREST NWR (USFWS) 6.07
KAHANA (USGS) 6.02
SIGNIFICANT RAINFALL RATES ACROSS OAHU ON FEBRUARY 21ST...
LULUKU (NWS/13016): 17.07 INCHES IN 6 HOURS, AND 13.01 INCHES IN 3 HOURS.
MOANALUA RG (USGS): 13.44 INCHES IN 6 HOURS, AND 12.49 INCHES IN 3 HOURS.
POAMOHO RG1 (USGS): 13.09 INCHES IN 6 HOURS, AND 8.10 INCHES IN 3 HOURS.
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