Lingering instability and moisture from the recent Kona storm caused heavy showers over the Kau District on the Big Island of Hawaii.
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The episode as NWS HFO wrote it up.
Lingering instability and moisture from the recent Kona storm caused heavy showers over the Kau District on the Big Island of Hawaii.
The local office's own words before the first event, 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 the first event at Dec 8, 4:00 AM HST, 2 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 AM HST SAT DEC 8 2007 .SYNOPSIS... WIDESPREAD RAIN WITH LOCALLY HEAVY SHOWERS TODAY WILL TAPER OFF GRADUALLY OVER THE REST OF THE WEEKEND AND SHIFT TO NORTHEAST SLOPES AS TRADE WINDS RETURN BY THE MIDDLE OF THE COMING WEEK. && .DISCUSSION... THE DEEPLY STACKED LOW JUST NORTH OF THE MAIN HAWAIIAN ISLANDS DID SHOW SIGNS OF MOVING NORTH AND REJOINING THE GENERAL CIRCULATION... BUT LIKE AN UNWELCOME GUEST IT LINGERED ON THE DOORSTEP...HAT IN HAND AS IT WERE. TO BE MORE PRECISE...SHORT WAVES ROTATING AROUND THE LOW DEEPENED IT PERIODICALLY...AND PROVIDED ADDITIONAL IMPETUS FOR THE DEVELOPMENT OF SUBSIDIARY FEATURES...LIKE THE NEARLY STATIONARY BAND OF SHOWERS LOCATED TO THE NORTHWEST OF THE BIG ISLAND. SOUTHEAST SLOPES OF THE BIG ISLAND IN PARTICULAR EXPERIENCED ONGOING...TERRAIN-ANCHORED HEAVY RAIN AS THE RESULT OF THE UPPER LOW JOINING FORCES WITH SPEED CONVERGENCE IN THE PREDOMINANTLY SOUTHERLY LOW-LEVEL FLOW. ALTHOUGH THE HEAVIEST PRECIPITATION HAD SHIFTED AWAY FROM OAHU AND KAUAI COUNTY...A BAND OF MODERATE SHOWERS FORMED AT THE BOUNDARY BETWEEN THE NORTHWESTERLY AND SOUTHWESTERLY FLOW IN CONCERT WITH ONE OF THE SHORT WAVES ALOFT...GIVING KAUAI A THOROUGH SOAKING...AND ON ITS WAY TO PROVIDE THE SAME FOR OAHU. ADDITIONAL BOUNDARIES... SUCH AS THAT BETWEEN THE SOUTHERLIES AND SOUTHWESTERLIES...SERVED AS YET MORE FOCI FOR SQUEEZING RAINFALL FROM THE MOIST AIRMASS. WIND SPEED WAS DOWN AT LOWER ELEVATIONS...AND THE MARINE FORECASTS REFLECTED THE REMOVAL OF THE SMALL CRAFT ADVISORY...BUT AT HIGHER ELEVATIONS CONDITIONS STILL BARELY WARRANTED A WIND ADVISORY. IF GUIDANCE IS RIGHT...THEN IT SHOULD BE POSSIBLE TO DROP THE WIND ADVISORY AT 6 AM HST AS EXPECTED. THIS DEVELOPMENT WOULD CORRELATE NICELY WITH THE ORIENTATION OF THE LOW AND DIURNAL WIND TRENDS...BUT IN THE EVENT OF THE UNEXPECTED...AN UPDATE MAY BE NEEDED BEFORE 6 AM TO EXTEND THE ADVISORY. OTHERWISE...THE FORECAST HAS BEEN REBUILT EXTENSIVELY TO FOLLOW GUIDANCE. THE MODELS CONTINUE TO AGREE FAIRLY WELL WITH ONE ANOTHER...AND APPEAR TO PLACE THE GROSS AREAS OF PRECIPITATION WELL...THOUGH FINE DETAIL STILL FINDS WAYS TO SURPRISE. THE WIND FIELD ALSO APPEARS TO BE MORE OR LESS ON TRACK. ASIDE FROM THE SHORT-TERM EMERGENCIES...THE PROBLEM OF THE DAY PROBABLY STILL CONSISTS OF MANAGING THE TRANSITION TO TRADE WINDS THROUGH THE BEGINNING OF THE COMING WEEK. && .HFO WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY FOR SUMMITS OF HALEAKALA AND BIG ISLAND THROUGH 6 AM TODAY. FLASH FLOOD WATCH FOR ALL ISLANDS THROUGH NOON TODAY. && RYSHKO
The national radar mosaic for the moment the first event began.
1 flash flood. Local standard time, as filed.
Heavy showers resulted in flash flooding conditions in the Kawa Flats area in the Kau District on the Big Island of Hawaii. Hawaii Belt Road, also know as Highway 11, was closed for a time because of the deep water flowing across the road surface.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Hawaii in 2007Every state in 2007This day in weather historyWarnings in Hawaii, December 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 67655.