Alert archive / Hawaii / Flash Flood Warnings in 2016

Flash Flood Warning 13, NWS Honolulu, HI

July 24, 2016Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jul 24, 2016, 9:40 PM HST for Honolulu County, Hawaii. It was in force for 7 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 24, 2016, 9:40 PM HST (07:40 UTC)
Expired: Jul 25, 2016, 4:56 AM HST
In force: 7 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 83 km from the middle of the area, began a volume at 07:43 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lihue, (PHLI), launched 00:00Z, 7.7 hours before the alert went out and 160 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1145 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 521 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 62 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

319 
WGHW50 PHFO 250740
FFWHFO
HIC003-251030-
/O.NEW.PHFO.FF.W.0013.160725T0740Z-160725T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
940 PM HST SUN JUL 24 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF OAHU IN HONOLULU COUNTY

* UNTIL 1230 AM HST

* AT 933 PM HST...RADAR CONTINUED TO INDICATE HEAVY RAIN OVER MUCH
  OF OAHU. RAIN WAS FALLING AT A RATE OF 2 TO 4 INCHES PER HOUR.
  FLASH FLOODING IS OCCURRING IN MANY LOCATIONS ACROSS THE ISLAND
  ALREADY. H-1 WESTBOUND HAS BEEN CLOSED AT LILIHA STREET AND SCHOOL
  STREET, WITH REPORTS OF CARS STALLED IN THE ROAD AS A RESULT OF
  THE FLOODING. MANY AREA STREAMS HAVE RISEN ABOVE FLOOD STAGE AS
  WELL...WITH ADDITIONAL FLOODING IMMINENT OVER THE NEXT SEVERAL
  HOURS. THIS IS A DANGEROUS SITUATION...WITH DAMAGE LIKELY TO OCCUR
  IN THE AREAS WHICH ARE TYPICALLY SUSCEPTIBLE TO FLOODING FROM
  HEAVY RAINS.

* LOCATIONS IN THE WARNING INCLUDE...
  THE ISLAND OF OAHU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IN IMMINENT OR OCCURRING IN
STREAMS...ROADS...AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING WATER IN YOUR VEHICLE...OR ON FOOT. TURN
AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 1230 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2130 15791
      2134 15797 2130 15811 2149 15824 2153 15823
      2158 15828 2158 15812 2169 15803 2171 15797

$$

JELSEMA

4 follow-up statements

455 
WGHW70 PHFO 250931
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1131 PM HST SUN JUL 24 2016

HIC003-251030-
/O.CON.PHFO.FF.W.0013.000000T0000Z-160725T1030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
1131 PM HST SUN JUL 24 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1230 AM HST FOR
THE ISLAND OF OAHU IN HONOLULU COUNTY...

AT 1120 PM HST...RADAR CONTINUED TO INDICATE AREAS OF HEAVY RAIN
ACROSS MUCH OF OAHU. RAIN WAS FALLING AT A RATE OF 1 TO 2 INCHES PER
HOUR...AND FLASH FLOODING CONTINUES IN MANY LOCATIONS. H-1 WESTBOUND
REMAINS CLOSED AT LILIHA STREET AND SCHOOL STREET, WITH REPORTS OF
CARS STALLED IN THE ROAD AS A RESULT OF THE FLOODING. IN
ADDITION...DILLINGHAM BOULEVARD IS CLOSED AT MIDDLE STREET DUE TO
DEBRIS IN THE ROADWAY. MANY AREA STREAMS REMAIN ABOVE FLOOD STAGE AS
WELL...WITH FLOODING EXPECTED TO CONTINUE FOR THE NEXT SEVERAL
HOURS. THIS IS A DANGEROUS SITUATION...WITH DAMAGE LIKELY IN THE
AREAS WHICH ARE TYPICALLY SUSCEPTIBLE TO FLOODING FROM HEAVY RAINS.

LOCATIONS IN THE WARNING INCLUDE...
THE ISLAND OF OAHU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IN IMMINENT OR OCCURRING IN
STREAMS...ROADS...AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING WATER IN YOUR VEHICLE...OR ON FOOT. TURN
AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 1230 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2130 15791
      2134 15797 2130 15811 2149 15824 2153 15823
      2158 15828 2158 15812 2169 15803 2171 15797

$$

JELSEMA

788 
WGHW50 PHFO 251005
FFWHFO
HIC003-251330-
/O.EXT.PHFO.FF.W.0013.000000T0000Z-160725T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
1205 AM HST MON JUL 25 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF OAHU IN HONOLULU COUNTY

* UNTIL 330 AM HST

* AT MIDNIGHT HST...EMERGENCY MANAGEMENT REPORTED SEVERAL ROADS
  FLOODED BY HEAVY RAIN AND SLOW RUNOFF. ALSO...RADAR INDICATED
  AREAS OF MODERATE TO HEAVY RAIN CONTINUING ON OAHU. SOME OF THE
  HEAVIER POCKETS OF RAIN WERE FALLING AT A RATE OF 1 TO 2 INCHES
  PER HOUR. FLASH FLOODING IS ALREADY OCCURRING.

* LOCATIONS IN THE WARNING INCLUDE...
  THE ISLAND OF OAHU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IN IMMINENT OR OCCURRING IN
STREAMS...ROADS...AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING WATER IN YOUR VEHICLE...OR ON FOOT. TURN
AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 330 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2130 15791
      2134 15797 2130 15811 2149 15824 2153 15823
      2158 15828 2158 15812 2169 15803 2171 15797

$$

EVANS

831 
WGHW50 PHFO 251323
FFWHFO
HIC003-251630-
/O.EXT.PHFO.FF.W.0013.000000T0000Z-160725T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
323 AM HST MON JUL 25 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF OAHU IN HONOLULU COUNTY

* UNTIL 630 AM HST

* AT 316 AM HST...RADAR CONTINUED TO INDICATE MODERATE TO HEAVY RAIN
  FALLING ACROSS PORTIONS OF OAHU, AND OVER AREAS THAT HAVE SEEN A
  SUBSTANTIAL AMOUNT OF RAIN OVERNIGHT. FLOODING OF POOR DRAINAGE
  AREAS IS EXPECTED TO CONTINUE AND STREAM LEVELS WILL REMAIN
  ELEVATED UNTIL THE RAINS DIMINISH LATER THIS MORNING.

* LOCATIONS IN THE WARNING INCLUDE...
  THE ISLAND OF OAHU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IN IMMINENT OR OCCURRING IN
STREAMS...ROADS...AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING WATER IN YOUR VEHICLE...OR ON FOOT. TURN
AROUND...DON/T DROWN.

&&

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 630 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2130 15791
      2134 15797 2130 15811 2149 15824 2153 15823
      2158 15828 2158 15812 2169 15803 2171 15797

$$

JELSEMA

734 
WGHW70 PHFO 251456
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
456 AM HST MON JUL 25 2016

HIC003-251502-
/O.CAN.PHFO.FF.W.0013.000000T0000Z-160725T1630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
456 AM HST MON JUL 25 2016

...THE FLASH FLOOD WARNING FOR THE ISLAND OF OAHU IN HONOLULU COUNTY
IS CANCELLED...

REPORTS FROM EMERGENCY MANAGEMENT OFFICIALS INDICATE THAT THE FLOOD
WATERS FROM THE HEAVY RAINFALL WHICH FELL OVERNIGHT HAVE RECEDED AND
NO LONGER POSE A THREAT TO LIFE OR PROPERTY. THEREFORE, THE FLASH
FLOOD WARNING HAS BEEN CANCELLED.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2130 15791
      2134 15797 2130 15811 2149 15824 2153 15823
      2158 15828 2158 15812 2169 15803 2171 15797

$$

JELSEMA

The office that day

Everything else NWS Honolulu, HI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 24, 5:35 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Jul 24, 7:08 PM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Jul 25, 2:28 AM HST	Special Marine Warning	HFO		2 hr

Nearby

Flash Flood Warnings in Hawaii, 2016 Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.