Hawaii, 2015

Flash Flood in Hawaii, September 14, 2015

September 14, 2015 · NWS HFO · 1 event in 1 county or zone

High running water at Wailuku River's Boiling Pots on the Big Island resulted in one drowning fatality after the swimmer was pulled downstream and didn't make it out. The other swimmer was able to make it to the river bank downstream.

Where it happened

Every event with a place to put it. Tap one for its entry below.

  • Tornadoes
  • Tropical storms and surge
  • Floods
  • Wind
  • Hail
  • Winter weather
  • Heat and drought
  • Cold
  • Fire, smoke and dust
  • Marine and coastal
  • Other

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The toll

Deaths
1
Injuries
0
Property damage
None recorded
Crop damage
None recorded
Events
1

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

What happened

The episode as NWS HFO wrote it up.

High running water at Wailuku River's Boiling Pots on the Big Island resulted in one drowning fatality after the swimmer was pulled downstream and didn't make it out. The other swimmer was able to make it to the river bank downstream.

What forecasters said that day

The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Honolulu, HI wrote its last area forecast discussion before the first event at Sep 14, 3:59 PM HST, 1 hour 51 minutes earlier.

Area forecast discussion, Sep 14, 3:59 PM HST, 1 hour 51 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
359 PM HST MON SEP 14 2015

.SYNOPSIS...
A STRONG SURFACE HIGH FAR NORTH OF THE AREA WILL KEEP TRADE WINDS
BLOWING OVER THE ISLANDS THROUGH THURSDAY. A BAND OF SHOWERS WILL OVER
THE ISLANDS AND KEEP WINDWARD AREAS RATHER WET AND CLOUDY THROUGH
WEDNESDAY. THE ATMOSPHERE MAY TURN MOIST AND UNSTABLE AGAIN NEXT
WEEKEND...BRINGING THE THREAT OF MORE UNSETTLED WEATHER.

&&

.DISCUSSION...
MODERATE TO FRESH TRADE WINDS DRIVEN BY A STRONG HIGH FAR NORTH
OF THE STATE. SATELLITE AND RADAR SHOW SCATTERED SHOWERS CARRYING
IN WITH THE TRADE WINDS BRINGING SCATTERED WINDWARD SHOWERS ACROSS
THE AREA THIS AFTERNOON. SOME LEEWARD AREAS ARE RECEIVING SOME
SHOWER ACTIVITY AS THE WINDS PUSH THEM OVER THE MOUNTAINS.

A 1030 MB HIGH FAR IS NORTH OF HAWAII NEAR 41N158W. MODELS ARE IN
GOOD AGREEMENT SHOWING THE HIGH MOVING SOUTH CLOSER TO THE STATE
IN THE NEXT COUPLE OF DAYS...THEN MOVING TOWARDS THE EAST THROUGH
THE WEEKEND. THE HIGH WILL KEEP TRADE WINDS BLOWING OVER THE
ISLANDS THROUGH AT LEAST THURSDAY.

SATELLITE IMAGERY SHOWS A FETCH OF CLOUDS AND SHOWERS EXTENDING
OUT 600 MILES EAST OF THE BIG ISLAND. THE TRADE WINDS ARE PUSHING
THE SHOWERS WESTWARD OVER THE STATE...AND WILL KEEP WINDWARD AREAS
RATHER CLOUDY AND SHOWERY THROUGH WEDNESDAY. SOME OF THE SHOWERS
MAY SPREAD LEEWARD ON THE SMALLER ISLANDS...MAINLY DURING THE
NIGHT AND EARLY MORNING HOURS.

THE WEATHER MAY TURN BRIEFLY DRIER ON THURSDAY AS THE SHOWERS MOVE OFF
TO THE WEST. HOWEVER...THE GLOBAL MODELS SUGGEST THE WEATHER MAY
TURN WETTER AGAIN FRIDAY THROUGH THE WEEKEND. A LOW ALOFT
APPROACHING FROM THE EAST AND TROPICAL MOISTURE SPREADING OVER THE
AREA FROM THE SOUTHEAST COULD BRING MORE MUGGY WEATHER AND THE
THREAT OF HEAVY RAIN.

&&

.AVIATION...
VFR CONDITIONS WILL CONTINUE THROUGH MUCH OF THE
EVENING WITH ISOL MVFR IN CLOUDS AND SHOWERS THAT WILL BE FOCUSED
OVER WINDWARD SLOPES. OVERNIGHT A BAND OF LOW CLOUDS MAY EXPAND THE
AREAS IMPACTED BY CLOUDS AND SHOWERS...WHICH MAY NECESSITATE AN
AIRMET FOR MOUNTAIN OBSCURATION...WITH CONDITIONS IMPROVING TUESDAY
MORNING. LOW LEVEL WINDS HAVE PROMPTED AIRMET TANGO FOR MECHANICAL
TURBULENCE TO THE LEE OF THE MOUNTAINS OF ALL ISLANDS.

&&

.MARINE...
THE SMALL CRAFT ADVISORY /SCA/ HAS BEEN EXPANDED TO COVER ALL
COASTAL WATERS EXCEPT THE WINDWARD BIG ISLAND DUE TO INITIALLY
STRONGER TRADE WINDS. THIS SCA GOES THROUGH THE DAY TUESDAY WITH
AT LEAST SOME OF THE WINDIER ZONES LIKELY CONTINUING BEYOND THIS
TIME. THE DRIVING HIGH PRESSURE WEAKENS AFTER TUESDAY RESULTING IN
THE TRADE WINDS WEAKENING SLIGHTLY.

A SMALL TO MODERATE SOUTH SOUTHWEST SWELL IS EXPECTED TO CONTINUE
THROUGH MUCH OF THE WEEK. SURF ALONG SOUTH FACING SHORES MAY RISE TO
JUST BELOW THE HIGH SURF ADVISORY THRESHOLD ON FRIDAY. TRADE WINDS
WILL GENERATE SMALL TO MODERATE SURF ALONG EAST FACING SHORES
THROUGH MUCH OF THE WORK WEEK.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST TUESDAY FOR ALL HAWAIIAN
COASTAL WATERS EXCEPT WINDWARD BIG ISLAND WATERS.

&&

DISCUSSION/MARINE...FOSTER
AVIATION...M BALLARD

The radar

The Kamuela/Kohala Apt radar (PHKM), 82 km away, was scanning. The volume nearest the first event began at 03:48 UTC.

Open the radar archive at this moment

Event by event

1 flash flood. Local standard time, as filed.

Flash Flood, Hawaii

When
September 14, 5:50 PM HST to 7:00 PM HST
Where
Hawaii County, 4.03 mi WSW of Hilo to 3.86 mi WSW of Hilo
Cause
Heavy Rain
Deaths
1 direct, 0 indirect
Reported by
Newspaper
Coordinates
19.715, -155.130

Fire/rescue crews responded to a 5:50 p.m. alarm Monday (Sept 14) to Wailuku River Boiling Pots State Park for a missing swimmer.|A witness said he was swimming in the upper pond at Boiling Pots with a 62-year-old woman when both began to be pulled downstream by the fast-moving current. Both attempted to swim towards the river bank but the woman didn’t make it out.

The people who died

As the offices recorded each death: direct deaths were caused by the weather itself, indirect ones by something it set in motion.

EventDateAgeSexWhereKind
Flash Flood, Hawaii2015-09-1462FemaleIn WaterDirect

What these are

Flash Flood
Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

More

Every storm in Hawaii in 2015Every state in 2015This day in weather historyWarnings in Hawaii, September 2015

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 612580.