Alert archive / Hawaii / Flash Flood Warnings in 2017

Flash Flood Warning 2, NWS Honolulu, HI

February 11, 2017Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Feb 11, 2017, 1:26 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: Feb 11, 2017, 1:26 PM HST (23:26 UTC)
Expired: Feb 11, 2017, 4:30 PM 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), 74 km from the middle of the area, began a volume at 23:27 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
Feb 11, 1:59 PM HST	FLASH FLOOD	Waikiki, HI	OFF DUTY NWS EMPLOYEE REPORTED APPROXIMATELY ONE FOOT OF WATER ON KALIA ROAD.

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

The nearest sounding before it

Hilo, (PITO), launched 12:00Z, 11.4 hours before the alert went out and 349 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1202 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 97 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

568 
WGHW50 PHFO 112326
FFWHFO
HIC003-120230-
/O.NEW.PHFO.FF.W.0002.170211T2326Z-170212T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash FLood Warning
National Weather Service Honolulu HI
126 PM HST SAT FEB 11 2017

The National Weather Service in Honolulu has issued a

* Flash Flood Warning for...
  The island of Oahu in Honolulu County

* Until 430 PM HST
    
* At 124 PM HST, radar indicated bands of heavy showers and
  thunderstorms over Honolulu, the southeastern Koolau mountains and
  onto the windward coast of Oahu. Streams such as Waikane and
  Punaluu have reached flood stage and will cause flash flooding
  along Kamehameha Highway on the windward coast. Rain was falling
  at a rate of 2 to 3 inches per hour.

* Locations in the warning include but are not limited to...
  Honolulu, Maunawili, Kailua, Waikane, Hawaii Kai, Salt Lake,
  Kaneohe, Waiahole, Moanalua, Halawa, Kaneohe Marine Base and
  Waimanalo.

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 430 PM HST if heavy rain
persists.

LAT...LON 2153 15784 2146 15784 2141 15778 2145 15777
      2145 15773 2136 15772 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2131 15791
      2134 15797 2138 15794 2139 15798 2146 15800
      2164 15792

$$

Foster

1 follow-up statement

051 
WGHW70 PHFO 120035
FFSHFO

Flash Flood Statement
National Weather Service Honolulu HI
235 PM HST SAT FEB 11 2017

HIC003-120044-
/O.CAN.PHFO.FF.W.0002.000000T0000Z-170212T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Honolulu HI-
235 PM HST SAT FEB 11 2017

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

Weather radar showed that heavy rain has ended.

LAT...LON 2153 15784 2146 15784 2141 15778 2145 15777
      2145 15773 2136 15772 2131 15765 2126 15770
      2130 15772 2126 15782 2134 15790 2131 15791
      2134 15797 2138 15794 2139 15798 2146 15800
      2164 15792

$$

Foster

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 10, 3:27 PM HST	High Surf Advisory	HFO	Hawaii, Honolulu, Kauai, Kalawao	24 hr
Feb 10, 7:54 PM HST	Special Marine Warning	HFO		2 hr
Feb 10, 9:20 PM HST	Special Marine Warning	HFO		115 min
Feb 10, 11:20 PM HST	Areal Flood Advisory	HFO	Kauai	3 hr
Feb 11, 2:00 AM HST	Areal Flood Advisory	HFO	Kauai	9 hr
Feb 11, 3:30 AM HST	Wind Advisory	HFO	Kalawao	24 hr
Feb 11, 5:08 AM HST	Areal Flood Advisory	HFO	Honolulu	6 hr
Feb 11, 5:53 AM HST	Special Weather Statement	HFO	Honolulu	22 min
Feb 11, 7:56 AM HST	Special Weather Statement	HFO	Honolulu	34 min
Feb 11, 7:57 AM HST	Special Marine Warning	HFO		48 min
Feb 11, 8:38 AM HST	Special Marine Warning	HFO		52 min
Feb 11, 9:25 AM HST	Special Marine Warning	HFO		65 min
Feb 11, 10:02 AM HST	Special Marine Warning	HFO		58 min
Feb 11, 10:28 AM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Feb 11, 10:30 AM HST	Special Weather Statement	HFO	Honolulu	45 min
Feb 11, 10:51 AM HST	Special Marine Warning	HFO		39 min
Feb 11, 11:03 AM HST	Special Marine Warning	HFO		27 min
Feb 11, 11:25 AM HST	Special Marine Warning	HFO		65 min
Feb 11, 11:29 AM HST	Special Weather Statement	HFO		31 min
Feb 11, 12:17 PM HST	Special Weather Statement	HFO	Honolulu	58 min
Feb 11, 12:20 PM HST	Special Marine Warning	HFO		55 min
Feb 11, 1:10 PM HST	Special Marine Warning	HFO		65 min
Feb 11, 1:16 PM HST	Special Weather Statement	HFO	Honolulu	59 min

Nearby

Flash Flood Warnings in Hawaii, 2017 Every flash flood warning in 2017

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.