Alert archive / Hawaii / Flash Flood Warnings in 2016

Flash Flood Warning 9, NWS Honolulu, HI

July 23, 2016Hawaii County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jul 23, 2016, 2:09 PM HST for Hawaii County, Hawaii. It was in force for 6 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 23, 2016, 2:09 PM HST (00:09 UTC)
Expired: Jul 23, 2016, 8:00 PM HST
In force: 6 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Hawaii County, HI

The radar

The South Shore radar (PHWA), 41 km from the middle of the area, began a volume at 00:10 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

Hilo, (PITO), launched 00:00Z, 0.2 hours before the alert went out and 51 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: 1050 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 718 m above ground
0-6 km bulk shear: 17 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: -22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

891 
WGHW50 PHFO 240009
FFWHFO
HIC001-240300-
/O.NEW.PHFO.FF.W.0009.160724T0009Z-160724T0300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
209 PM HST SAT JUL 23 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF HAWAII IN HAWAII COUNTY

* UNTIL 500 PM HST

* AT 202 PM HST...RADAR INDICATED HEAVY RAIN MOVING ONSHORE FROM THE
  EAST AND SOUTHEAST. RAINFALL WILL SPREAD ACROSS THE PUNA AND KAU
  DISTRICTS OVER THE NEXT SEVERAL HOURS AS THE CENTER OF DARBY
  APPROACHES THE BIG ISLAND. 

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
  HILO...PAHOA...MOUNTAIN VIEW...GLENWOOD...
  HAWAII VOLCANOES NATIONAL PARK...WOOD VALLEY...PAHALA...
  NAALEHU AND KAWA FLATS.


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 500 PM HST IF HEAVY RAIN
PERSISTS.

THIS FLASH FLOOD WARNING REPLACES THE PREVIOUSLY ISSUED FLOOD
ADVISORY THAT WAS IN EFFECT FOR PORTIONS OF THE ISLAND OF HAWAII IN
HAWAII COUNTY.

LAT...LON 1897 15572 1904 15588 1940 15562 2001 15526
      1985 15509 1974 15510 1974 15500 1965 15499
      1953 15481 1948 15482 1934 15499 1927 15516
      1927 15529 1913 15551 1899 15559 1891 15568

$$

KODAMA

2 follow-up statements

522 
WGHW50 PHFO 240255
FFWHFO
HIC001-240600-
/O.EXT.PHFO.FF.W.0009.000000T0000Z-160724T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
455 PM HST SAT JUL 23 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF HAWAII IN HAWAII COUNTY

* UNTIL 800 PM HST

* AT 445 PM HST...RADAR SHOWED THAT A NEW BAND OF HEAVY RAIN HAS
  DEVELOPED WITH RAIN MOVING ONSHORE TO THE PUNA DISTRICT FROM THE
  SOUTH. THIS BAND IS EXPECTED TO MOVE SLOWLY WESTWARD AND SPREAD
  INTO THE KAU DISTRICT. RUNOFF FROM EARLIER RAIN ABOVE KAWA FLATS
  MEANS THAT HIGHWAY 11 AT THAT LOCATION MAY BE VULNERABLE TO
  CLOSURE WITH ANY SIGNIFICANT ADDITIONAL RAINFALL.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
  HILO...PAHOA...MOUNTAIN VIEW...GLENWOOD...
  HAWAII VOLCANOES NATIONAL PARK...WOOD VALLEY...PAHALA...
  NAALEHU AND KAWA FLATS.

  
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 800 PM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 1897 15572 1904 15588 1940 15562 2001 15526
      1985 15509 1974 15510 1974 15500 1965 15499
      1953 15481 1948 15482 1934 15499 1927 15516
      1927 15529 1913 15551 1899 15559 1891 15568

$$

KODAMA

893 
WGHW70 PHFO 240555
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
755 PM HST SAT JUL 23 2016

HIC001-240600-
/O.EXP.PHFO.FF.W.0009.000000T0000Z-160724T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HAWAII HI-
755 PM HST SAT JUL 23 2016

...THE FLASH FLOOD WARNING FOR THE ISLAND OF HAWAII IN HAWAII COUNTY
WILL EXPIRE AT 800 PM HST...

AT 750 PM HST...WEATHER RADAR SHOWED SCATTERED SHOWERS OVER THE PUNA
AND KAU DISTRICTS AND AROUND THE SOUTH POINT AREA ON THE BIG ISLAND.
NO FLOODING HAS BEEN REPORTED TO HAWAII COUNTY CIVIL DEFENSE DURING
THE PAST FEW HOURS. THE FLASH FLOOD WARNING WILL BE ALLOWED TO
EXPIRE...BUT A FLOOD ADVISORY WILL BE ISSUED SHORTLY FOR THE SOUTH
POINT AREA AND KAU DISTRICT...AS AN AREA OF MODERATE TO LOCALLY
HEAVY RAIN IS MOVING ONSHORE FROM THE SOUTH.

LAT...LON 1897 15572 1904 15588 1940 15562 2001 15526
      1985 15509 1974 15510 1974 15500 1965 15499
      1953 15481 1948 15482 1934 15499 1927 15516
      1927 15529 1913 15551 1899 15559 1891 15568

$$

JACOBSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 7:58 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Jul 23, 9:29 PM HST	Flash Flood Warning	HFO	Hawaii	9 hr
Jul 24, 3:12 AM HST	Areal Flood Advisory	HFO	Kalawao	6 hr
Jul 24, 9:23 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Jul 24, 9:35 AM HST	Areal Flood Advisory	HFO	Kalawao	3 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.