Heavy Rain, Hawaii
- When
- August 19, 3:28 AM HST to 5:20 AM HST
- Where
- Hawaii County, Kailua Kona
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 19.602, -155.523 (the zone’s center; the record gives no point)
Heavy Rain in Hawaii, August 19, 2004
Heavy showers produced small stream and drainage ditch flooding, and ponding of roadways in leeward sections of the Big Island of Hawaii. However, no serious property damage or injuries were reported.
Where it happened
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.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 1
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.
What happened
The episode as NWS HFO wrote it up.
Heavy showers produced small stream and drainage ditch flooding, and ponding of roadways in leeward sections of the Big Island of Hawaii. However, no serious property damage or injuries were reported.
What forecasters said that day
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 Aug 18, 8:30 PM HST, 6 hours 58 minutes earlier.
Area forecast discussion, Aug 18, 8:30 PM HST, 6 hours 58 minutes before
HAWAIIAN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 830 PM HST WED AUG 18 2004 .SYNOPSIS...A RIDGE OF HIGH PRESSURE IS CURRENTLY LOCATED JUST NORTH OF KAUAI...AND WILL MOVE NORTHWARD OVER THE NEXT COUPLE OF DAYS. AS A RESULT...TRADE WINDS WILL BE RETURNING AND INCREASING STEADILY... REACHING MODERATE LEVELS BY SATURDAY. WINDS WILL LIKELY BE LIGHT ENOUGH ON FRIDAY FOR AFTERNOON SEA BREEZES TO DEVELOP...ALLOWING CLOUDS AND ISOLATED SHOWERS TO DEVELOP OVER INTERIOR SECTIONS. THE ATMOSPHERE OVER THE ISLANDS WILL BE RELATIVELY STABLE...SO HEAVY SHOWERS ARE NOT EXPECTED. A SUMMER TRADE WIND WEATHER PATTERN OF NIGHT AND MORNING SHOWERS WINDWARD AND MAUKA WILL PREVAIL FROM FRIDAY UNTIL EARLY NEXT WEEK. && .DISCUSSION...ALTHOUGH TRADE WINDS ARE GRADUALLY FIRMING...WITH MODEST 1 MB PRESSURE RISES ACROSS THE ISLANDS OVER THE PAST 24 HOURS...THE SURFACE RIDGE IS STILL FAIRLY CLOSE TO THE ISLANDS...ABOUT 150 MILES NORTH OF KAUAI. THEREFORE...LIGHT TO MODERATE TRADES EXIST AROUND THE BIG ISLAND...WITH LITTLE TO NO WIND...ON THE SYNOPTIC SCALE...NEAR KAUAI. HAVE UPDATED GRIDS...AND THE TEXT FORECAST AS WELL...TO DECREASE POP...SKY AND WEATHER OVER THE ISLANDS FROM MOLOKAI TO KAUAI...WITH THE THOUGHT THAT WINDS WILL BE LIGHT ENOUGH FOR LAND BREEZES TO DEVELOP AND VIRTUALLY ELIMINATE ANY CHANCE OF RAIN OVER THE ISLANDS TONIGHT. HOWEVER...HAVE RETAINED SOMEWHAT OF A TRADE FORECAST FOR WINDWARD MAUI AND BIG ISLAND OVER NIGHT AS TRADES ARE CARRYING A FEW CLOUDS TOWARDS THOSE ISLANDS. HAVE NOT ALTERED FORECAST FOR THURSDAY AS FAR AS DEPICTING A TRADE WIND WEATHER PATTERN...BUT AM LEANING TOWARDS A CONVECTIVE WEATHER PATTERN FOR THE ISLANDS OF KAUAI AND OAHU. WILL NOT ALTER THIS FORECAST AS OF YET...INSTEAD WAITING UNTIL LATER MODEL RUNS PROVIDE UPDATED GUIDANCE...AND WILL MONITOR OBSERVATIONS OVER NIGHT BEFORE MAKING A FINAL DECISION. AFTER THAT...AS THE HIGH PRESSURE RIDGE NORTH OF THE ISLANDS BUILDS AND MOVES FURTHER NORTH TO NEAR 29N THIS WEEKEND...TRADE WINDS WILL STRENGTHEN TO MODERATE TO FRESH LEVELS AND REMAIN WITH US THROUGH THE MIDDLE OF NEXT WEEK...AT LEAST. && .LONG TERM...MODELS ARE STILL TRYING TO DEVELOP A WEAK DISTURBANCE EAST OF 140W...NEAR 11N 132W...INTO A TROPICAL DEPRESSION AS IT CROSSES 140W DURING THE DAY ON FRIDAY. LATEST MODEL RUNS ARE PROJECTING A TRACK THAT WOULD TAKE THIS SYSTEM SOUTH OF THE ISLANDS TUESDAY AND WEDNESDAY NEXT WEEK...WHICH WOULD MEAN A TIGHTER PRESSURE GRADIENT OVER THE ISLANDS AND INCREASED TRADE WINDS. AT THIS POINT...DIFFICULT TO SAY WHAT MIGHT HAPPEN TO A SYSTEM THAT HAS YET TO MATURE...SO WILL HOLD FORECAST AT STATUS QUO. && .HFO WATCHES/WARNINGS/ADVISORIES...NONE. && BIRCHARD
The radar
The national radar mosaic for the moment the first event began.
Event by event
1 heavy rain. Local standard time, as filed.
What these are
- Heavy Rain
- Rainfall totals unusual for the place and season that did not produce a flood.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Wind in Texas, August 19 to 20, 2004
- Damaging Winds in Ohio, August 19, 2004
- Flash Flooding and Damaging Winds in Texas, August 19, 2004
- Damaging Wind in Louisiana, August 19, 2004
- Flash Flood in Colorado, August 19, 2004
- Cold in Minnesota, August 19 to 21, 2004
- Cold in North Dakota, August 19 to 21, 2004
- Hail and Damaging Winds in Ohio, August 19, 2004
- Hail in New Mexico, August 19, 2004
- Hail and Damaging Winds in Indiana, August 19, 2004
- Damaging Winds and Lightning Strike in Virginia, August 19, 2004
- Flash Flooding in Texas, August 19, 2004
More
Every storm in Hawaii in 2004Every state in 2004This day in weather historyWarnings in Hawaii, August 2004
Sources
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: 5431605.