Alert archive / Hawaii / Flash Flood Warnings in 2017

Flash Flood Warning 7, NWS Honolulu, HI

February 28, 2017Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Feb 28, 2017, 11:18 PM HST for Honolulu County, Hawaii. It was in force for 11 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: Feb 28, 2017, 11:18 PM HST (09:18 UTC)
Expired: Mar 1, 2017, 10:27 AM HST
In force: 11 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 81 km from the middle of the area, began a volume at 09:20 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, 9.3 hours before the alert went out and 357 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: 71 J/kg
Mixed-layer CIN: -53 J/kg
Mixed-layer LCL: 786 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

655 
WGHW50 PHFO 010918
FFWHFO
HIC003-011200-
/O.NEW.PHFO.FF.W.0007.170301T0918Z-170301T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash FLood Warning
National Weather Service Honolulu HI
1118 PM HST TUE FEB 28 2017

The National Weather Service in Honolulu has issued a

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

* Until 200 AM HST

* At 1103 PM HST, radar indicated heavy rain across  most of Oahu
  with more on the way. Rainfall rates are between 2 to 4 inches an
  hour with a strong potential for flash flooding and high risk for
  the loss of life and property. 

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

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 200 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$

Lau/Still

6 follow-up statements

189 
WGHW70 PHFO 010958
FFSHFO

Flash Flood Statement
National Weather Service Honolulu HI
1158 PM HST TUE FEB 28 2017

HIC003-011200-
/O.CON.PHFO.FF.W.0007.000000T0000Z-170301T1200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Honolulu HI-
1158 PM HST TUE FEB 28 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 200 AM HST FOR THE
ISLAND OF OAHU IN HONOLULU COUNTY...

At 1154 PM HST...radar indicated heavy rain across the warned area
with another batch of heavy rains about to move onshore between Aina
Haina and Kapolei.  The heavy rains are moving north at 20 mph.

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

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 200 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$
Lau

467 
WGHW50 PHFO 011134
FFWHFO
HIC003-011500-
/O.EXT.PHFO.FF.W.0007.000000T0000Z-170301T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash FLood Warning
National Weather Service Honolulu HI
134 AM HST WED MAR 1 2017

The National Weather Service in Honolulu has extended the

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

* Until 500 AM HST

* At 125 AM HST...radar indicated much of the heavy rain has abated
  across the warning area. However, the ground is saturated from the
  heavy rain in the past few hours and any additional heavy rain
  will easily lead to flash flooding. Some of the rivers are still
  swollen and running high as well.

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

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 500 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$

Lau

345 
WGHW50 PHFO 011433
FFWHFO
HIC003-011800-
/O.EXT.PHFO.FF.W.0007.000000T0000Z-170301T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash FLood Warning
National Weather Service Honolulu HI
433 AM HST WED MAR 1 2017

The National Weather Service in Honolulu has extended the

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

* Until 800 AM HST

* At 426 AM HST, radar indicated heavy rain has temporarily eased
  across Oahu. However, radar shows more heavy rain located just off
  the Waianae coast and south shore. These cells are moving north at
  15 to 20 mph. Flash flooding can occur when they move ashore.

  Honolulu Police is reporting that Kam Highway is closed in both
  directions fronting Turtle Bay due to flooding.

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

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 800 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$
Lau

146 
WGHW70 PHFO 011644
FFSHFO

Flash Flood Statement
National Weather Service Honolulu HI
644 AM HST WED MAR 1 2017

HIC003-011800-
/O.CON.PHFO.FF.W.0007.000000T0000Z-170301T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Honolulu HI-
644 AM HST WED MAR 1 2017

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 800 AM HST FOR THE
ISLAND OF OAHU IN HONOLULU COUNTY...

At 639 AM HST...radar indicated heavy rain moving across Oahu from
the southwest. This rain is falling over saturated ground which will
cause rapid rises in already swollen streams.

This warning includes the entire island of Oahu.

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 800 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$

Kodama

197 
WGHW50 PHFO 011754
FFWHFO
HIC003-012100-
/O.EXT.PHFO.FF.W.0007.000000T0000Z-170301T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash FLood Warning
National Weather Service Honolulu HI
754 AM HST WED MAR 1 2017

The National Weather Service in Honolulu has extended the

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

* Until 1100 AM HST

* At 744 AM HST, radar data, rain gages, and spotter reports showed
  that rainfall has eased over most of Oahu for now. However, an
  area of heavy rainfall is approaching the island from the south.
  This rainfall is expected to produce rapid runoff on saturated
  ground and urban flooding.

* This warning includes the entire island of Oahu.

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 1100 AM HST if heavy rain
persists.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$

Kodama

317 
WGHW70 PHFO 012027
FFSHFO

Flash Flood Statement
National Weather Service Honolulu HI
1027 AM HST WED MAR 1 2017

HIC003-012036-
/O.CAN.PHFO.FF.W.0007.000000T0000Z-170301T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Honolulu HI-
1027 AM HST WED MAR 1 2017

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

Weather radar showed that heavy rain has ended over Oahu and runoff
has receded.

A Flash Flood Watch remains in effect for Honolulu County through
Wednesday night.

LAT...LON 2155 15785 2147 15784 2141 15778 2147 15777
      2146 15773 2141 15774 2131 15765 2128 15768
      2128 15783 2134 15790 2130 15794 2134 15797
      2130 15811 2158 15827 2158 15812 2169 15803
      2171 15797

$$

Kodama

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 28, 2:03 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Feb 28, 5:32 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Feb 28, 5:47 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Feb 28, 7:13 PM HST	Flash Flood Warning	HFO	Honolulu	6 hr
Feb 28, 7:26 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Feb 28, 10:07 PM HST	Flash Flood Warning	HFO	Kalawao	113 min
Feb 28, 10:23 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Feb 28, 10:33 PM HST	Areal Flood Advisory	HFO	Kauai	6 hr
Feb 28, 11:20 PM HST	Special Marine Warning	HFO		55 min
Mar 1, 3:50 AM HST	Blizzard Warning	HFO	Hawaii	24 hr
Mar 1, 3:59 AM HST	Flash Flood Warning	HFO	Kauai	6 hr
Mar 1, 4:40 AM HST	Special Marine Warning	HFO		2 hr
Mar 1, 5:51 AM HST	Special Marine Warning	HFO		114 min
Mar 1, 6:10 AM HST	Special Weather Statement	HFO	Honolulu	65 min
Mar 1, 6:48 AM HST	Special Marine Warning	HFO		117 min
Mar 1, 8:12 AM HST	Special Marine Warning	HFO		108 min
Mar 1, 8:30 AM HST	Special Weather Statement	HFO		45 min
Mar 1, 9:26 AM HST	Special Weather Statement	HFO		64 min
Mar 1, 9:53 AM HST	Special Marine Warning	HFO		112 min
Mar 1, 11:30 AM HST	Special Weather Statement	HFO	Kalawao	60 min
Mar 1, 11:40 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 1, 11:43 AM HST	Special Marine Warning	HFO		2 hr
Mar 1, 12:08 PM HST	Severe Thunderstorm Warning	HFO	Kalawao	37 min
Mar 1, 12:48 PM HST	Areal Flood Advisory	HFO	Kalawao	9 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.