Alert archive / Hawaii / Flash Flood Warnings in 2016

Flash Flood Warning 21, NWS Honolulu, HI

September 13, 2016Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Sep 13, 2016, 9:20 PM HST for Honolulu County, Hawaii. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Sep 13, 2016, 9:20 PM HST (07:20 UTC)
Expired: Sep 14, 2016, 12:15 AM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 71 km from the middle of the area, began a volume at 07:22 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.

What was reported inside it

Time	Report	Where	Remark
Sep 13, 9:31 PM HST	FLOOD	3 Se Honolulu, HI	WAIKIKI SPOTTER REPORTS FLOODING ON KALAKAUA AND KUHIO AVENUES.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lihue, (PHLI), launched 00:00Z, 7.3 hours before the alert went out and 173 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: 160 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 21 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

857 
WGHW50 PHFO 140720
FFWHFO
HIC003-141015-
/O.NEW.PHFO.FF.W.0021.160914T0720Z-160914T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
920 PM HST TUE SEP 13 2016

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 1215 AM HST

* AT 917 PM HST...RADAR INDICATED HEAVY RAIN OVER HONOLULU AND
  ACROSS VARIOUS LOCATIONS ALONG THE KOOLAU MOUNTAINS ON EAST OAHU.
  UP TO 2 INCH PER HOUR RATES ARE NOTED ON RADAR. THE WAIKANE AND
  MANOA STREAMS ARE ABOVE FLOOD STAGE. THE AREAS OF HEAVY RAINFALL
  ARE NEARLY STATIONARY.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
  HONOLULU...MAUNAWILI...KAILUA...WAIKANE...HAWAII KAI...KANEOHE...
  WAIAHOLE...MOANALUA...HALAWA...KANEOHE MARINE BASE...WAIMANALO AND
  KALIHI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS 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 1215 AM 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 OAHU IN
HONOLULU COUNTY.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2133 15770 2131 15765
      2126 15770 2130 15772 2126 15782 2131 15789
      2157 15801 2161 15790

$$

POWELL

2 follow-up statements

939 
WGHW70 PHFO 140832
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1032 PM HST TUE SEP 13 2016

HIC003-141015-
/O.CON.PHFO.FF.W.0021.000000T0000Z-160914T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
1032 PM HST TUE SEP 13 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1215 AM HST FOR
THE ISLAND OF OAHU IN HONOLULU COUNTY...

AT 1025 PM HST...RADAR INDICATED HEAVY RAIN CONTINUES ACROSS
PORTIONS OF SOUTHEAST AND WINDWARD OAHU. RAINFALL RATES HAVE BEGUN
TO DECREASE AND STREAMS ARE BEGINNING TO LOWER. HOWEVER...MANOA
STREAM REMAINS NEAR FLOOD STAGE AND MORE SHOWERS ARE MOVING IN FROM
THE NORTHEAST. SPOTTERS IN WAIKIKI REPORTED LOCAL FLOODING ALONG
KALAKAUA AND KUHIO AVENUES. 

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO...
HONOLULU...MAUNAWILI...KAILUA...WAIKANE...HAWAII
KAI...KANEOHE...WAIAHOLE... MOANALUA...HALAWA...KANEOHE MARINE
BASE...WAIMANALO AND KALIHI.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS 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 1215 AM HST IF HEAVY RAIN
PERSISTS.

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2133 15770 2131 15765
      2126 15770 2130 15772 2126 15782 2131 15789
      2157 15801 2161 15790

$$

POWELL

875 
WGHW70 PHFO 140952
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1152 PM HST TUE SEP 13 2016

HIC003-140957-
/O.CAN.PHFO.FF.W.0021.000000T0000Z-160914T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
1152 PM HST TUE SEP 13 2016

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

WEATHER RADAR SHOWED THAT HEAVY RAIN HAS ENDED. ALL OAHU STREAMS
HAVE FALLEN BELOW FLOOD STAGE. RUNOFF MAY CONTINUE FOR THE NEXT FEW
HOURS. WHILE THE IMMEDIATE FLASH FLOOD THREAT HAS ENDED...OAHU
REMAINS WITHIN A FLASH FLOOD WATCH AREA THROUGH THURSDAY AFTERNOON. 

LAT...LON 2153 15784 2147 15784 2141 15778 2147 15777
      2147 15773 2141 15774 2133 15770 2131 15765
      2126 15770 2130 15772 2126 15782 2131 15789
      2157 15801 2161 15790

$$

POWELL

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 13, 2:09 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Sep 13, 4:14 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Sep 13, 4:58 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Sep 13, 7:05 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Sep 13, 7:21 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Sep 13, 8:21 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Sep 13, 8:59 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Sep 13, 9:30 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Sep 14, 4:11 AM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Sep 14, 9:43 AM HST	Special Marine Warning	HFO		2 hr
Sep 14, 10:14 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Sep 14, 11:04 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Sep 14, 11:48 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.