Heavy Rain, Hawaii
- When
- August 4, 1:28 PM HST to 4:02 PM HST
- Where
- Hawaii County, 4.5 mi WNW of Pahala to 10.31 mi SSW of Naalehu
- Reported by
- Official NWS Observations
- Coordinates
- 19.223, -155.544
Heavy Rain in Hawaii, August 4 to 6, 2015
With instability in the area, heavy rain occurred over parts of the Big Island of Hawaii. This produced small stream and drainage ditch flooding, and ponding on roadways.
Where it happened
Every event with a place to put it. 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
- 2
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.
With instability in the area, heavy rain occurred over parts of the Big Island of Hawaii. This produced small stream and drainage ditch flooding, and ponding on roadways. There were no reports of significant injuries or property damage.
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 4, 11:40 AM HST, 1 hour 48 minutes earlier.
Area forecast discussion, Aug 4, 11:40 AM HST, 1 hour 48 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 1140 AM HST TUE AUG 4 2015 .UPDATE... UPDATED FOR EXTENSION AND EXPANSION OF HIGH SURF ADVISORY. && .SYNOPSIS... CLOUDS ON THE FRINGE OF TROPICAL STORM GUILLERMO WILL MOVE OVER THE BIG ISLAND TODAY AND MAY PRODUCE LOCALLY HEAVY RAIN. TRADE WINDS WILL PREVAIL TODAY OVER THE SMALLER ISLANDS. THE TRADES WILL BRING SCATTERED SHOWERS TO WINDWARD AREAS...WITH MOSTLY DRY WEATHER OVER LEEWARD AREAS. TROPICAL STORM GUILLERMO IS FORECAST TO PASS NORTH OF THE BIG ISLAND AND MAUI TOMORROW AND NORTH OF OAHU AND KAUAI THURSDAY. TRADE WINDS WILL SPREAD BACK OVER THE ISLANDS FRIDAY NIGHT. TYPICALLY SUMMERTIME WEATHER IS EXPECTED OVER THE WEEKEND AND THROUGH NEXT WEEK. && .DISCUSSION... WEATHER AROUND THE HAWAIIAN ISLANDS WILL BE STRONGLY INFLUENCED BY TROPICAL STORM GUILLERMO THROUGH FRIDAY. THE CENTER OF GUILLERMO WAS ABOUT 410 MILES EAST OF HILO AT 900 AM ...MOVING NW AT 10 MPH. THE CENTRAL PACIFIC HURRICANE CENTER CONTINUES ISSUE WARNINGS ON GUILLERMO. THE FORECAST HAS GUILLERMO REMAINING NORTH OF THE ISLANDS TOMORROW AND THURSDAY BUT...IT IS FORECAST TO PASS CLOSE ENOUGH TO THE ISLANDS TO JUSTIFY A TROPICAL STORM WATCH FOR THE BIG ISLAND...MAUI COUNTY AND SURROUNDING COASTAL WATERS. A TROPICAL STORM WATCH IS IN EFFECT FOR THE BIG ISLAND AND ALL ISLANDS OF MAUI COUNTY THROUGH THURSDAY AT NOON. A TROPICAL STORM WARNING IS IN EFFECT FOR THE OFFSHORE WATERS BETWEEN 40 AND 240 NM FROM THE ISLANDS. PLEASE SEE THE TROPICAL STORM LOCAL STATEMENT ON OUR WEBSITE...PRODUCT HLSHFO...FOR MORE SPECIFIC INFORMATION ON HAZARDS RELATED TO GUILLERMO. A FLASH FLOOD WATCH IS IN EFFECT FOR THE POSSIBILITY OF FLASH FLOODING. MEANWHILE...A SURFACE HIGH WILL REMAIN FAR NORTHEAST OF THE MAIN HAWAIIAN ISLANDS. ONCE GUILLERMO MOVES OUT OF THE AREA...TRADE WINDS WILL RETURN. THE GLOBAL MODELS ARE IN GOOD AGREEMENT SHOWING TYPICAL SUMMERTIME TRADE-WIND WEATHER OVER THE WEEKEND AND THROUGH NEXT WEEK. && .AVIATION... THE CURRENT TRACK FOR GUILLERMO HAS THE BULK OF THE HEAVY WEATHER AND WIND PASSING NORTH OF THE ISLANDS. IT WILL STILL BRING SOME SCATTERED SHOWERS AND A SLIGHT CHANCE OF A THUNDERSTORMS TO THE AREA THROUGH THURSDAY. VFR CONDITIONS WILL PREVAIL TODAY OVER THE SMALLER ISLANDS AS SUBSIDENCE RUNNING OUT AHEAD OF APPROACHING GUILLERMO KEEPS THE ATMOSPHERE DRY AND STABLE. A BAND OF CLOUDS ON THE FRINGE OF GUILLERMO IS LIKELY TO MOVE OVER THE BIG ISLAND TODAY AND BRING WIDESPREAD MVFR CONDITIONS AND POSSIBLE IFR. TCU AND CB MAY PRODUCE LOCALLY LOW VSBY IN HEAVY SHRA. && .MARINE... A HIGH SURF ADVISORY IS IN EFFECT FOR EAST FACING SHORES OF THE BIG ISLAND AND MAUI THROUGH NOON THURSDAY AND FOR THE EAST FACING SHORES OF MOLOKAI...OAHU AND KAUAI FROM MIDNIGHT TONIGHT THROUGH NOON THURSDAY. A TROPICAL STORM WATCH IS IN EFFECT THROUGH NOON THURSDAY FOR COASTAL WATERS NEAR THE BIG ISLAND AND MAUI COUNTY AS GUILLERMO PASSES TO THE NORTH. SEE ADVISORY LIST BELOW FOR THE AFFECTED ZONES AND MWWHFO FOR MORE SPECIFIC INFORMATION. A WATCH MEANS THAT TROPICAL STORM CONDITIONS WILL BE POSSIBLE. OFFSHORE WATERS...FROM 40 NM TO 240 NM AWAY FROM THE MAIN HAWAIIAN ISLANDS...ARE UNDER A TROPICAL STORM WARNING. && .HFO WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH FOR THE BIG ISLAND AND MAUI. TROPICAL STORM WATCH FOR MAUI...KAHOOLAWE...LANAI...MOLOKAI AND THE BIG ISLAND. TROPICAL STORM WATCH FOR BIG ISLAND WINDWARD WATERS...THE ALENUIHAHA CHANNEL...MAUI COUNTY WINDWARD WATERS...MAALAEA BAY AND THE PAILOLO CHANNEL. HIGH SURF ADVISORY THROUGH NOON THURSDAY FOR EAST FACING SHORES OF THE BIG ISLAND AND MAUI. HIGH SURF ADVISORY FROM MIDNIGHT TONIGHT THROUGH NOON THURSDAY FOR EAST FACING SHORES OF MOLOKAI...OAHU AND KAUAI. && DONALDSON
The radar
The national radar mosaic for the moment the first event began.
Event by event
2 heavy rain. Local standard time, as filed.
Heavy Rain, Hawaii
- When
- August 6, 8:49 PM HST to 10:39 PM HST
- Where
- Hawaii County, 4.5 mi NW of Saddle Road Junction to 6.33 mi SSE of Kona Village Resort
- Reported by
- Official NWS Observations
- Coordinates
- 19.979, -155.726
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
- Damaging Winds in Connecticut, August 4, 2015
- Flood and Hail in Massachusetts, August 4, 2015
- Hail and Damaging Winds in Massachusetts, August 4, 2015
- Hail and Damaging Winds in New York, August 4, 2015
- Damaging Winds and Lightning Strike in Rhode Island, August 4, 2015
- Hail and Damaging Winds in Virginia, August 4, 2015
- Damaging Winds and Heavy Rain in Nebraska, August 4 to 5, 2015
- Damaging Wind in North Carolina, August 4, 2015
- Hail and Damaging Winds in Maine, August 4 to 14, 2015
- Hail and Damaging Winds in Virginia, August 4, 2015
- Hail and Damaging Winds in Maryland, August 4, 2015
- Hail and Damaging Wind in New York, August 4, 2015
More
Every storm in Hawaii in 2015Every state in 2015This day in weather historyWarnings in Hawaii, August 2015
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: 595820, 595825.