1 heavy rain, as filed by the National Weather Service.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
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 May 5, 4:00 PM HST, 3 hours 18 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 PM HST FRI MAY 5 2006 SYNOPSIS...AN UPPER TROUGH WILL CONTINUE TO TRIGGER BRIEF HEAVY SHOWERS ACROSS PORTIONS OF MAUI AND THE BIG ISLAND...WITH FEWER SHOWERS EXPECTED ACROSS ISLANDS AND WATERS FARTHER WEST. ISOLATED THUNDERSTORMS ARE ALSO POSSIBLE ACROSS MAUI AND THE BIG ISLAND TONIGHT...THEN ACROSS LEEWARD PORTIONS OF THE BIG ISLAND SATURDAY AFTERNOON. DRIER AND MORE STABLE WEATHER IS EXPECTED AFTER THE WEEKEND. && DISCUSSION... AT THE SURFACE...THE MAIN HAWAIIAN ISLANDS ARE UNDER THE INFLUENCE OF A 1029 MB HIGH NEAR 37N141W. A RIDGE EXTENDS WEST SOUTHWEST FROM THE HIGH...EXTENDING THROUGH 31N170W. THE PRESSURE GRADIENT BETWEEN THIS RIDGE AND EQUATORIAL LOW PRESSURE TO OUR SOUTH IS SUFFICIENTLY STEEP TO INDUCE 20 MPH TRADE WINDS ACROSS HAWAIIAN WATERS. SATELLITE LOOPS SHOW LOTS OF LOW LEVEL MOISTURE AND LOW CLOUD COVER UPWIND FROM THE ISLANDS...MAINLY EAST OF 155W. IF THE RIDGE EXTENDED ALL THE WAY UPWARD IN THE ATMOSPHERE...WE WOULD BE SEEING TYPICAL TRADE WIND WEATHER. HOWEVER AN UPPER TROUGH...ORIENTED ALMOST EAST TO WEST ACROSS THE ISLANDS...HAS DESTABILIZED THE ATMOSPHERE AND IS TRIGGERING ENHANCED AND WIDESPREAD SHOWERS ACROSS THE EASTERN ISLANDS THIS AFTERNOON. SOUNDINGS SHOW WEAK TO NONEXISTENT INVERSIONS. THE HILO SOUNDING HAD A DERIVED K INDEX OF 34 AND 1.7 INCHES OF PRECIPITABLE WATER...CONTRASTING A BIT WITH SLIGHTLY MORE STABLE AND DRY CONDITIONS AT LIHUE. THE TROUGH IS SHARP AND PRONOUNCED...SO THE TROUGH AXIS WHICH WAS DIRECTLY OVER LIHUE AT 1200Z IS NOW CLOSE TO HILO AT 0000Z. WHILE MUCH OF THE STATE EAST OF OAHU IS RATHER WET...TRADE FLOW IS DEEP ENOUGH AND STRONG ENOUGH TO KEEP INDIVIDUAL SHOWERS MOVING ALONG INSTEAD OF FIXING ON A PARTICULAR PATCH OF TERRAIN. AS LONG AS THESE SHOWERS KEEP MOVING ALONG THE FLOOD THREAT IS MINIMAL. RIGHT NOW...SCATTERED MODERATE AND ISOLATED HEAVY SHOWERS ARE LINED UP WITHIN A 60 MILE WIDE BAND EXTENDING FROM 100 MILES SOUTHWEST OF OAHU TO THE BIG ISLAND AND ACROSS BIG ISLAND WINDWARD WATERS. ISOLATED THUNDERSTORMS...WITH COLD CLOUD TOPS NEAR MINUS 53 DEGREES C...ARE LIKELY OCCURRING JUST EAST OF HANA AND ACROSS WINDWARD AND SOUTHEAST PUNA SLOPES OF THE BIG ISLAND. LATEST GFS75 SHOWS THE UPPER TROUGH WILL CUT OFF INTO AN UPPER LOW TONIGHT...LINGERING NEAR THE BIG ISLAND THROUGH MOST OF THE WEEKEND. WE WILL KEEP ISOLATED THUNDERSTORMS IN THE GRIDS FOR PORTIONS OF THE BIG ISLAND AND MAUI OVERNIGHT TONIGHT...THEN ACROSS LEEWARD BIG ISLAND AREAS SATURDAY AFTERNOON. AFTER THE WEEKEND...THE UPPER LOW WILL MOVE NORTHEASTWARD AWAY FROM THE ISLANDS. WEST AND NORTHWEST WINDS WILL RETURN ALOFT...WITH MODERATE TRADES EXPECTED TO CONTINUE NEAR THE SURFACE. SHOWERS WILL DECREASE AFTER THE WEEKEND AND CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS. && .HFO WATCHES/WARNINGS/ADVISORIES... NONE. && POWELL
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Heavy showers caused ponding on roadways, and small stream and drainage ditch flooding in the South Hilo and Puna districts on the Big Island of Hawaii. There were no reports of serious property damage or injuries.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Hawaii in 2006Every state in 2006This day in weather historyWarnings in Hawaii, May 2006
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: 5496392.