1 heavy rain, as filed by the National Weather Service.
Every event with a place to put it; 1 filed by county or forecast zone are drawn at its center, in a lighter ring. Tap one for its entry below.
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 15, 10:00 AM HST, 59 minutes earlier.
HAWAIIAN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 10 AM HST SAT MAY 15 2004 .SYNOPSIS... A COLD FRONT WILL MOVE ACROSS OAHU TODAY...MOLOKAI TONIGHT AND MAUI ON SUNDAY...STALLING NEAR THE BIG ISLAND ON MONDAY. HEAVY SHOWERS WITH ISOLATED THUNDERSTORMS WILL ACCOMPANY THE FRONT IN THIS PASSAGE EASTWARD. MOISTURE FROM THIS FRONTAL SYSTEM WILL THEN MOVE BACK WEST ACROSS THE STATE THROUGH THURSDAY...AS THE ASSOCIATED SURFACE LOW IS PULLED WESTWARD AND INTO ANOTHER DEVELOPING LOW PRESSURE SYSTEM FAR TO OUR NORTHWEST. EXPECT WINDS TO SWITCH AROUND TO NORTH THEN NORTHEAST BEHIND THE FRONT...THEN GRADUALLY TO EAST AND SOUTHEAST AS THE FRONT BACKS WESTWARD TO KAUAI LATER THIS WEEK. && .DISCUSSION... A VERY MOIST AIRMASS OVER THE STATE IS HAVING ITS MOISTURE SQUEEZED OUT IN THE FORM OF HEAVY SHOWERS AND THUNDERSTORMS...MAINLY OVER OAHU TODAY...AS THE FRONT MOVES ACROSS THE STATE FROM WEST TO EAST. SLIGHTLY DRIER AIR BEHIND THIS FRONT WILL BRING SOME COOLING RELIEF FROM THE HIGH DEW POINTS AND HUMIDITIES OF THE PAST FEW DAYS. WINDS WILL TURN FROM SOUTH AND SOUTHWEST AHEAD OF THE FRONT TO WEST...THEN NORTH AND FINALLY TO NORTHEAST BEHIND THE FRONT. BY MONDAY...THE FRONT IS EXPECTED TO STALL NEAR THE BIG ISLAND...AS THE PARENT LOW PRESSURE CENTER TURNS WESTWARD AND WEAKENS AS IT IS DRAWN INTO ANOTHER...MORE SIGNIGICANT LOW PRESSURE SYSTEM MOVING EAST ACROSS THE PACIFIC FAR TO OUR NORTHWEST. && .LONG TERM... AS WINDS ALL ACROSS THE STATE TURN EASTERLY EARLY NEXT WEEK...THE MOISTURE ASSOCIATED WITH THIS FRONTAL SYSTEM WILL BE BLOWN BACK WESTWARD...BACK ACROSS THE STATE FROM EAST TO WEST. THE WARM AND HUMID AIR EAST OF THIS FRONT WILL FOLLOW IN ITS WAKE...FOR MORE WARM AND HUMID WEATHER DURING THE SECOND HALF OF THIS WEEK. SOUTHEASTERLY TO EASTERLY TRADES WILL CONTINUE THROUGH NEXT WEEKEND...WITH CONDITIONS REMAINING RATHER WARM AND MUGGY FOR HAWAII. && .WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH OAHU AND MAUI COUNTY FOR TODAY AND TONIGHT. FARRELL
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Heavy showers and steady rain produced ponding of roadways and small stream and drainage ditch flooding in southern parts of Oahu. There were no reports of serious injuries or property damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Hawaii in 2004Every state in 2004This day in weather historyWarnings in Hawaii, May 2004
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: 5431473.