Flash Flood Warning 84, NWS Honolulu, HI

Issued

Mar 19, 2006, 3:45 AM HST (13:45 UTC)

Expired

Mar 19, 2006, 6:45 AM HST

In force

3 hr

Issued by

NWS Honolulu, HI

Area

Counties, with a storm outline in the text

County Kauai County, HI

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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.

000
WGHW50 PHFO 191346
FFWHFO
HIC007-191645-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
345 AM HST SUN MAR 19 2006

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 645 AM HST

* AT 336 AM HST...RADAR SHOWED HEAVY RAIN NEAR ANAHOLA...OR ABOUT 12
  MILES NORTH OF LIHUE. THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAENA...WAINIHA...KILAUEA...HANALEI...PRINCEVILLE AND MOLOAA.

MOVE TO HIGHER GROUND NOW. STAY AWAY FROM STREAMS AND LOW LYING AREAS
PRONE TO FLOODING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS
AND COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

BE ESPECIALLY CAUTIOUS SINCE IT IS HARDER TO SEE FLASH FLOODING IN
THE DARK. AVOID TRAVEL.

DO NOT TRY TO CROSS FAST FLOWING OR RISING WATER IN YOUR VEHICLE OR
ON FOOT. THE WATER MAY BE TOO DEEP TO CROSS SAFELY. TURN AROUND...
DON/T DROWN.

REPORT FLOODING TO POLICE OR CIVIL DEFENSE OFFICIALS FOR RELAY TO THE
NATIONAL WEATHER SERVICE.

THIS FLASH FLOOD WARNING MAY NEED TO BE EXTENDED BEYOND 645 AM HST IF
FLASH FLOODING CONDITIONS PERSIST.

LAT...LON 2199 15933 2214 15920 2230 15949 2222 15963

$$
POWELL

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Mar 18, 8:30 PM HST, 7 hours 15 minutes earlier.

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST SAT MAR 18 2006

.SYNOPSIS...
UNSTABLE SHOWERY WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN
ISLANDS FOR THE NEXT SEVEN DAYS...THANKS TO PERSISTENT LOW PRESSURE
TO OUR WEST. WINDS WILL REMAIN RATHER LIGHT...CAUSING RAINFALL TO
INCREASE FROM LATE MORNING THROUGH EVENING EACH DAY THEN DECREASE AT
NIGHT. THUNDERSTORMS AND HEAVY RAINFALL ARE POSSIBLE THROUGH SUNDAY.

&&

.DISCUSSION...
HEAVY SHOWERS AND THUNDERSTORMS FLARED ONCE AGAIN ACROSS THE ALOHA
STATE TODAY...NAMELY ACROSS KAUAI AND PORTIONS OF THE LEEWARD SIDE
OF THE BIG ISLAND. THIS ACTIVITY HAS DIED DOWN NEAR KAUAI THIS
EVENING BUT PERSISTS ON THE BIG ISLAND. AFTERNOON SOUNDINGS SHOWED
THE ATMOSPHERE REMAINS WET AND UNSTABLE WITH K INDICES OF 30 OR
GREATER AND PRECIPITABLE WATER BETWEEN 1.65 AND 1.8 INCHES. THE
ATMOSPHERE IS RIPE FOR HEAVY RAINFALL. ALL THAT IS NEEDED IS A
CONVECTIVE TRIGGER LIKE DAYTIME HEATING OR AN INTERACTION OF OUTFLOW
BOUNDARIES.

THE CURRENT UNSTABLE AND WET WEATHER PATTERN WILL CONTINUE THROUGH
THE SEVEN DAY FORECAST PERIOD. AN UPPER TROUGH 400 TO 600 MILES WEST
OF THE MAIN ISLANDS IS BEGINNING TO CONSOLIDATE INTO AN UPPER
LOW...A FEATURE THAT THE STORM TRACK WESTERLIES WILL HAVE GREAT
DIFFICULTY DIGGING OUT FOR THE NEXT WEEK. GFS75 SHOWS THIS UPPER LOW
WILL OPEN UP INTO A TROUGH AGAIN LATE FRIDAY...BUT WILL REMAIN
ANCHORED WEST OF THE ISLANDS INTO NEXT WEEKEND. THIS PERSISTENT
TROUGHING ALOFT WILL INDUCE A SURFACE TROUGH WEST OF THE ISLANDS AS
WELL THROUGH THE NEXT WEEK...A FEATURE WHICH WILL KEEP OUR WINDS
LIGHT AND THE ISLANDS SUBJECT TO INCREASED DAYTIME RAINFALL DUE TO
HEATING.

LATEST GFS75 BRINGS PULSES OF HEAVY RAINFALL TO THE ISLANDS OVER THE
COMING WEEK. SUNDAY...WEDNESDAY AND FRIDAY ARE THE DAYS THESE PULSES
ARRIVE...COINCIDING WITH THE FORECAST FORMATION AND PASSAGE OF SHORT
WAVES ALOFT. THE FORECAST CALLS FOR THE POSSIBILITY OF HEAVY
RAINFALL AND THUNDERSTORMS THROUGH SUNDAY. THE FLOOD WATCH HAS BEEN
EXTENDED THROUGH MONDAY EVENING TO ACCOUNT FOR JUST MODERATE
RAINFALL POTENTIALLY TRIGGERING FLOODING ACROSS SOAKED AND SATURATED
GROUND.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...

FLASH FLOOD WATCH...ALL ISLANDS THROUGH MONDAY EVENING.

&&

POWELL

Flash Flood Warnings in Hawaii, 2006Every flash flood warning in 2006

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.