Heavy Rain, Maui
- When
- August 10, 6:57 AM HST to 9:32 AM HST
- Where
- Maui County, 1.55 mi WSW of Kahakuloa to 0.79 mi NW of Kipahulu
- Reported by
- Official NWS Observations
- Coordinates
- 20.994, -156.573
Heavy Rain in Hawaii, August 10, 2013
A somewhat unstable atmosphere and moisture from former Tropical Cyclone Gil combined to produce heavy showers over parts of Maui and Oahu. The rain caused 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.
A somewhat unstable atmosphere and moisture from former Tropical Cyclone Gil combined to produce heavy showers over parts of Maui and Oahu. The rain caused small stream and drainage ditch flooding, and ponding on roadways. No significant injuries or property damage 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 10, 4:00 AM HST, 2 hours 57 minutes earlier.
Area forecast discussion, Aug 10, 4:00 AM HST, 2 hours 57 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 AM HST SAT AUG 10 2013 .SYNOPSIS... MODERATE TRADE WINDS WILL PERSIST INTO NEXT WEEK. DEEP MOISTURE LEFT OVER FROM A DISSIPATED TROPICAL CYCLONE WILL BRING WIDESPREAD... POSSIBLY HEAVY...RAIN TO THE STATE THROUGH SUNDAY...BUT SHOWERS SHOULD DIMINISH AND BECOME LIMITED MAINLY TO WINDWARD SLOPES BY AROUND MONDAY. && .DISCUSSION... SOLIDLY MODERATE TRADE WINDS CARRIED A LARGE MASS OF STRATUS CLOUD LAYERS AND DEEP MOISTURE LEFT OVER FROM GIL ACROSS THE MAIN HAWAIIAN ISLANDS. ALTHOUGH BALLOON SOUNDINGS AND SATELLITE ESTIMATES REPORTED AN ABUNDANCE OF WATER VAPOR...WEAK RIDGING OR VAGUELY NEUTRAL CONDITIONS ALOFT KEPT STATIC STABILITY A BIT HIGHER THAN MIGHT BE EXPECTED. THUS...MOST PRECIPITATION OCCURRED AS STRATUS RAIN. AREAS RECEIVING THE GREATEST ACCUMULATION INCLUDED WINDWARD MAUI AND OAHU...BUT RAINFALL SPREAD ACROSS WINDWARD SLOPES OF THE BIG ISLAND AS WELL... AND SOME PASSED OVER OR WRAPPED AROUND HIGHER TERRAIN TO REACH A FEW AREAS LEEWARD. KAUAI COUNTY REMAINED THE LEAST AFFECTED FOR NOW... BUT THE CURRENT TRAJECTORY OF THE CLOUD MASS...AND MODEL GUIDANCE... SUGGESTED THAT THE STRATUS RAIN WOULD ARRIVE LATER TODAY. THE LOCAL TOOL FOR CALCULATING THUNDERSTORM CHANCES BASED ON MODEL OUTPUT SUGGESTED RATHER LOW CHANCES ACROSS THE STATE FOR MOST MODELS...BUT THUNDERSTORMS WILL REMAIN AN OUTSIDE POSSIBILITY WITH THE CORE OF THE MOST CONCENTRATED MOISTURE. WITH PRECIPITABLE WATER QUITE HIGH...EVEN FOR THE SEASON...ANY DEEP CONVECTION THAT DOES OCCUR WILL BE CAPABLE OF PRODUCING HEAVY RAIN. RECENT GUIDANCE INCLINED TO KEEPING THE POOL OF MOISTURE OVER THE STATE THROUGH THE REST OF THE WEEKEND. SATELLITE ESTIMATES CONCURRED...SHOWING ONE LOCAL MAXIMUM PASSING OVER THE CENTRAL ISLANDS EARLY THIS MORNING... AND ANOTHER MAXIMUM STILL LOCATED FURTHER TO THE EAST. TROPICAL STORM HENRIETTE NOW APPEARED TO HAVE LITTLE CHANCE OF DIRECTLY AFFECTING THE MAIN HAWAIIAN ISLANDS. ITS INFLUENCE PROBABLY WILL BE LIMITED TO INCREASING THE TRADE WINDS MODESTLY AS IT PASSES BY TO THE SOUTH. IN THE LONGER TERM...MODEL CONSENSUS PREDICTED TRADE WINDS TO PERSIST...AND POSSIBLY STRENGTHEN A BIT AROUND TUESDAY. SOLUTIONS ALSO EXPECTED WEAKNESS TO DEVELOP IN THE MID-LEVEL RIDGING OVER THE ISLANDS...SO TRADE-WIND SHOWERS ARE LIKELY TO INCREASE SLIGHTLY AGAIN THROUGH THAT TIME FRAME AS WELL. && .MARINE... SWELL PRODUCED BY HENRIETTE MAY ARRIVE LATER THIS WEEKEND. SURF HAS THE POTENTIAL TO REACH THE THRESHOLD FOR A HIGH SURF ADVISORY ALONG EAST-FACING SHORES OF THE BIG ISLAND. A SERIES OF SMALL SOUTHERLY SWELLS WILL ARRIVE THROUGH THE FORECAST PERIOD. THE COMBINATION OF LOCALLY GENERATED WIND WAVES AND SWELLS FROM HENRIETTE WILL INCREASE SURF ALONG EAST-FACING SHORES. SMALL PULSES ALSO MAY ARRIVE FROM THE NORTH AND NORTHWEST THROUGH SUNDAY. && .HFO WATCHES/WARNINGS/ADVISORIES... NONE. && RYSHKO
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, Honolulu
- When
- August 10, 8:35 AM HST to 11:32 AM HST
- Where
- Honolulu County, 2.34 mi WNW of Kahuku to 0.72 mi NNW of Niu Valley
- Reported by
- Official NWS Observations
- Coordinates
- 21.698, -157.981
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
- Rip Current in Florida, August 10, 2013
- Flash Flood and Debris Flows in Washington, August 10 to 11, 2013
- Wildfire in Utah, August 10 to 24, 2013
- Lightning Strike in Idaho, August 10, 2013
- Hail and Damaging Winds in South Dakota, August 10, 2013
- Hail and Damaging Winds in Virginia, August 10, 2013
- Hail and Damaging Winds in North Dakota, August 10, 2013
- Debris Flow and Damaging Winds in Colorado, August 10, 2013
- Damaging Winds in Virginia, August 10, 2013
- Damaging Winds in North Carolina, August 10, 2013
- Damaging Wind in Arizona, August 10, 2013
- Hail and Damaging Wind in Montana, August 10 to 12, 2013
More
Every storm in Hawaii in 2013Every state in 2013This day in weather historyWarnings in Hawaii, August 2013
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: 468558, 468559.