Alert archive / Hawaii / Flash Flood Warnings in 2013

Flash Flood Warning 45, NWS Honolulu, HI

July 29, 2013Kalawao County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jul 29, 2013, 5:17 PM HST for Kalawao 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: Jul 29, 2013, 5:17 PM HST (03:17 UTC)
Expired: Jul 29, 2013, 8:15 PM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Kalawao County, HI

The radar

The Kamuela/Kohala Apt radar (PHKM), 93 km from the middle of the area, began a volume at 03:19 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
Jul 29, 6:57 PM HST	FLASH FLOOD	Kihei, HI	3FT OF WATER DIVERTED FROM CLOGGED STREAM BEFORE DAMAGING HOME.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 100 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Hilo, (PITO), launched 00:00Z, 3.3 hours before the alert went out and 181 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: 82 J/kg
Mixed-layer CIN: -290 J/kg
Mixed-layer LCL: 1144 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -7 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

053 
WGHW50 PHFO 300317
FFWHFO
HIC009-300615-
/O.NEW.PHFO.FF.W.0045.130730T0317Z-130730T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
517 PM HST MON JUL 29 2013

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 815 PM HST

* AT 506 PM HST...RADAR SHOWED HEAVY RAIN OVER EAST MAUI AND THE 
  SOUTH SLOPE OF HALEAKALA WITH RATES OF 3 TO 4 INCHES PER HOUR.  
  THE AREA OF HEAVY RAIN WAS MOVING TOWARD THE WEST AT 15 MILES PER 
  HOUR AND WILL SHIFT FROM EAST MAUI TO CENTRAL MAUI OVER THE NEXT 
  SEVERAL HOURS.  

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HANA...KIPAHULU...KAUPO...KEANAE...NAHIKU...HAIKU...ULUPALAKUA...
  KIHEI...KULA...WAILEA...PAIA AND KAHULUI.  LOW WATER CROSSINGS 
  ALONG THE PIILANI HIGHWAY IN SOUTHEAST MAUI ARE ESPECIALLY AT RISK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

THIS FLASH FLOOD WARNING REPLACES THE FLOOD ADVISORY THAT WAS IN
EFFECT FOR THE ISLAND OF MAUI IN MAUI COUNTY.

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 815 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2097 15648 2099 15624 2077 15592 2059 15608
      2057 15650

$$


KODAMA

2 follow-up statements

635 
WGHW70 PHFO 300519
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
719 PM HST MON JUL 29 2013

HIC009-300615-
/O.CON.PHFO.FF.W.0045.000000T0000Z-130730T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
719 PM HST MON JUL 29 2013

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF MAUI IN
MAUI COUNTY UNTIL 815 PM HST...

MOST OF THE HEAVY RAINS HAVE MOVED WEST OF THE VALLEY ISLE.
HOWEVER RUNOFF REMAINS ELEVATED AND WILL TAKE AWHILE TO EASE DOWN. 
THUS...THE FLASH FLOOD WARNING REMAINS IN EFFECT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 815 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2097 15648 2099 15624 2077 15592 2059 15608
      2057 15650

$$
LAU

103 
WGHW70 PHFO 300607
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
807 PM HST MON JUL 29 2013

HIC009-300615-
/O.CAN.PHFO.FF.W.0045.000000T0000Z-130730T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MAUI HI-
807 PM HST MON JUL 29 2013

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

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE ENDED
AND STREAM LEVELS HAVE EASED OFF TO SAFE LEVELS. THUS THE FLASH 
FLOOD WARNING IS CANCELLED.

LAT...LON 2097 15648 2099 15624 2077 15592 2059 15608
      2057 15650

$$
LAU

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Jul 29, 3:30 PM HST, 1 hour 47 minutes earlier.

Area forecast discussion, Jul 29, 3:30 PM HST, 1 hour 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST MON JUL 29 2013

.SYNOPSIS...
TROPICAL STORM FLOSSIE IS WEAKENING WHILE MOVING WEST NORTHWEST
ACROSS THE STATE THROUGH EARLY TUESDAY. THE SYSTEM WILL BRING
GUSTY WINDS...VERY HEAVY RAINFALL...AND DANGEROUS SURF TO ALL
ISLANDS. A MORE TYPICAL TRADE WIND WEATHER PATTERN WILL ESTABLISH
FOR THE SECOND HALF OF THE WEEK AS FLOSSIE MOVES AWAY FROM THE AREA.

&&

.DISCUSSION...
AS OF 2 PM HST...TROPICAL STORM FLOSSIE IS LOCATED 80 MILES NNE OF
HILO...OR 145 MILES ESE OF HONOLULU. MAXIMUM SUSTAINED WINDS ARE 40
MPH. CURRENT MOTION IS TO THE WNW AT 18 MPH. PLEASE SEE THE LATEST
DISCUSSION FROM THE CENTRAL PACIFIC HURRICANE CENTER /TCDCP1 OR
WTPA41 PHFO/ FOR INFORMATION ON THE SYNOPTIC PATTERN AFFECTING
FLOSSIE...AND THE LATEST TROPICAL STORM LOCAL STATEMENT FROM WFO
HONOLULU /HLSHFO OR WTHW80 PHFO/ FOR SPECIFIC IMPACTS ACROSS THE
STATE.

LATEST MIMIC PWAT/MODEL DATA DEPICT ABUNDANT MOISTURE LINGERING
ACROSS THE AREA...KEEPING HIGH CHANCES FOR RAIN OVER THE ISLANDS
THROUGH WED. IN THE WAKE OF FLOSSIE...EXPECT HIGH PRESSURE FAR NE OF
THE ALOHA STATE TO BRING BACK A PREVAILING TRADE WIND WEATHER REGIME
ACROSS THE ISLAND CHAIN FROM LATE WED AND THROUGH THE REST OF THE
FORECAST PERIOD.

&&

.AVIATION...
SIGMET ZULU REMAINS IN EFFECT FOR TROPICAL STORM FLOSSIE. WIDESPREAD
IFR CONDITIONS MAINLY IN LOW CEILINGS WILL AFFECT BIG ISLAND AND
MAUI COUNTY. THESE CONDITIONS ARE EXPECTED TO SPREAD WESTWARD TO
OAHU EARLY THIS EVENING AND TO KAUAI TONIGHT. STRONG SURFACE WINDS
ARE POSSIBLE WITH FLOSSIE...BUT THESE ARE EXPECTED TO DIMINISH AS
FLOSSIE CONTINUES TO WEAKEN. WITH THE DEEP MOISTURE ASSOCIATED WITH
THE TROPICAL SYSTEM...ICING IS ALSO POSSIBLE NEAR THE BIG ISLAND
GENERALLY BETWEEN 16KFT-22KFT. THIS MATCHES UP WITH THE DEPTH OF THE
MOISTURE LAYER APPARENT ON THE 00Z HILO SOUNDING...AND LIES WITHIN
THE TEMPERATURE RANGE OF 0C TO -12C.

&&

.MARINE...
SEAS AT THE HILO BAY CDIP BUOY CLIMBED RAPIDLY DURING THE MORNING
HOURS...ASSOCIATED WITH TROPICAL STORM FLOSSIE...PEAKING AT 14 FEET
AT 8 AM HST. PLEASE SEE THE LATEST TROPICAL STORM LOCAL STATEMENT
FROM WFO HONOLULU /HLSHFO OR WTHW80 PHFO/ FOR SPECIFIC MARINE
IMPACTS ACROSS THE AREA.

SMALL TO MODERATE S AND SE SWELLS WILL CONTINUE THROUGH TUE. A
LARGER...LONG PERIOD S SWELL IS EXPECTED TO ARRIVE LATE TUE...AND
PEAK ON WED NEAR ADVISORY LEVELS FOR S FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH LATE TUESDAY NIGHT FOR ALL HAWAIIAN
ISLANDS.

TROPICAL STORM WARNING FOR ALL HAWAII ISLANDS.

TROPICAL STORM WARNING FOR ALL HAWAIIAN WATERS.

&&

PUBLIC/MARINE...REYNES
AVIATION...BRAVENDER

In the hours before

Local storm report, Jul 29, 1:41 PM HST, 3 hours 36 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
141 PM HST MON JUL 29 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1140 AM     TROPICAL STORM   PAHOA                   19.50N 154.95W
07/29/2013                   HAWAII             HI   LAW ENFORCEMENT

            ROUTE 123 IN PAHOA IS CLOSED FROM NANAWALE TO LAVE TREE
            STATE PARK DUE TO DOWN TREES AND POWERLINES.

1140 AM     TROPICAL STORM   PAHOA                   19.50N 154.95W
07/29/2013                   HAWAII             HI   LAW ENFORCEMENT

            ROUTE 123 IN PAHOA IS CLOSED BETWEEN NANAWALE AND LAVA
            TREE STATE PARK DUE TO DOWN TREES AND POWERLINES.

&&

LEATON

Local storm report, Jul 29, 1:57 PM HST, 3 hours 20 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE HONOLULU HI
157 PM HST MON JUL 29 2013

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1140 AM     TROPICAL STORM   PAHOA                   19.50N 154.95W
07/29/2013                   HAWAII             HI   LAW ENFORCEMENT

            ROUTE 123 IN PAHOA IS CLOSED BETWEEN NANAWALE AND LAVA
            TREE STATE PARK DUE TO DOWN TREES AND POWERLINES. POHOIKI
            ROAD IS CLOSED FROM ROUTE 123 TO LEILANI BLVD.

&&

LEATON

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 3:20 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Jul 29, 4:38 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jul 29, 5:12 PM HST	High Surf Warning	HFO	Honolulu, Kalawao	10 hr
Jul 29, 5:12 PM HST	High Surf Advisory	HFO		10 hr
Jul 29, 5:13 PM HST	Small Craft Advisory	HFO		58 hr
Jul 29, 5:50 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Jul 29, 6:15 PM HST	Special Marine Warning	HFO		2 hr
Jul 29, 6:53 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jul 29, 7:03 PM HST	Special Marine Warning	HFO		57 min
Jul 29, 7:34 PM HST	Special Marine Warning	HFO		116 min
Jul 29, 7:57 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jul 29, 8:01 PM HST	Special Marine Warning	HFO		119 min
Jul 29, 8:52 PM HST	Special Marine Warning	HFO		113 min
Jul 29, 8:55 PM HST	Wind Advisory	HFO	Kalawao	14 hr
Jul 29, 11:27 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Jul 30, 3:35 AM HST	High Surf Advisory	HFO	Honolulu	23 hr
Jul 30, 9:11 AM HST	Areal Flood Advisory	HFO	Kauai	109 min

Nearby

Flash Flood Warnings in Hawaii, 2013 Every flash flood warning in 2013

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.