Heavy Rain, Hawaii
- When
- August 18, 6:32 PM HST to 9:25 PM HST
- Where
- Hawaii County, 4.46 mi SW of Kona Village Resort to 2.43 mi SE of Captain Cook
- Reported by
- Official NWS Observations
- Coordinates
- 19.778, -156.021
Heavy Rain in Hawaii, August 18, 2014
An upper low moving over the state produced heavy rain over leeward parts of the Big Island of Hawaii. The showers 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
- 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.
An upper low moving over the state produced heavy rain over leeward parts of the Big Island of Hawaii. The showers caused small stream and drainage ditch flooding, and ponding on roadways. 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, 3:59 PM HST, 2 hours 33 minutes earlier.
Area forecast discussion, Aug 18, 3:59 PM HST, 2 hours 33 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 359 PM HST MON AUG 18 2014 .SYNOPSIS... TRADE WIND WEATHER WILL CONTINUE THROUGH THE WEEK WITH SHOWERS FAVORING WINDWARD AND MOUNTAIN LOCATIONS. WINDWARD SHOWERS WILL INCREASE TONIGHT AS THE ATMOSPHERE BECOMES SOMEWHAT UNSTABLE. EXPECT A FEW SHOWERS TO REACH LEEWARD LOCATIONS AS WELL. A DRIER TRADE WIND PATTERN IS ON TAP FROM WEDNESDAY THROUGH THE WEEKEND. && .DISCUSSION... MODERATE TRADE WINDS CONTINUE THIS AFTERNOON WITH LOW CLOUDS COVERING WINDWARD AREAS... BRINGING SOME LIGHT TO MODERATE SHOWERS. VISIBLE IMAGERY AND RADAR ESTIMATES SHOW LOW CLOUD TOPS UPSTREAM OF THE ISLANDS HAVE INCREASED FROM 8 KFT TO 10-12 KFT. WINDWARD AND MOUNTAIN AREAS WILL SEE INCREASING CLOUDS AND SHOWERS TONIGHT AS AN UPPER LOW DIPS SOUTH OVER THE STATE... BRINGING SOME ATMOSPHERIC INSTABILITY. CLOUD TOP HEIGHT WILL INCREASE WITH THE ADDED INSTABILITY...ALLOWING FOR MODERATE RAINFALL AND AN INCREASE IN SHOWER COVERAGE. THE HIGHER CLOUD TOPS WILL ALLOW SOME SHOWERS TO REACH LEEWARD LOCATIONS AS WELL. THE UPPER LOW WILL LINGER THROUGH TUESDAY BEFORE PULLING NORTH OF THE ISLANDS WEDNESDAY...KEEPING WINDWARD AREAS UNDER PASSING SHOWERS THROUGH TUESDAY NIGHT. FOR THE SECOND HALF OF THE WEEK... EXPECT DIMINISHING SHOWERS AND CLOUDS AS THE LOW MOVES AWAY AND A STABLE ATMOSPHERE MOVES IN. MODERATE TRADE WINDS WILL CONTINUE INTO THE WEEKEND AS HIGH PRESSURE REMAINS FAR NORTHEAST OF THE STATE. THE TROPICS REMAIN ACTIVE IN THE EAST PACIFIC...BUT LATEST FORECASTS FROM THE NATIONAL HURRICANE CENTER AND GLOBAL MODELS KEEP ANY TROPICAL SYSTEMS FAR FROM HAWAII THROUGH THE FORESEEABLE FUTURE. && .AVIATION... 00Z RAOBS AND 23Z-01Z ACARS SOUNDINGS SHOW ELEVATED INVERSION HEIGHTS AND WINDS OF 15-20 KT WITHIN THE BOUNDARY LAYER. WE HAVE NOT RECEIVED ANY PIREPS OF TURBULENCE SINCE A LIGHT-MODERATE REPORT YESTERDAY AFTERNOON...AND CONDITIONS ARE INCREASINGLY LESS CONDUCIVE. THEREFORE HAVE CANCELLED THE AIRMET FOR MODERATE LOW-LEVEL TURBULENCE. A BAND OF MOISTURE NORTH OF THE STATE WILL ENHANCE TRADE WIND SHOWERS. CONDITIONS WILL BE PRIMARILY VFR...WITH OCCASIONAL MVFR CONDITIONS EXPECTED IN SHOWERS MAINLY ACROSS WINDWARD AREAS. && .MARINE... NO SMALL CRAFT ADVISORIES ARE IN EFFECT. HOWEVER...TYPICAL WINDY WATERS AROUND MAUI AND BIG ISLAND WILL BE NEAR SCA CONDITIONS THROUGHOUT THE WEEK. PULSES OF SWELL WILL MAINTAIN AVERAGE TO ABOVE AVERAGE SURF ALONG SOUTH FACING SHORES THIS WEEK. THE CURRENT SSW SWELL WILL DECLINE TODAY AND TUESDAY. ANOTHER PULSE FROM THE SSW IS EXPECTED WEDNESDAY THROUGH FRIDAY. SEE THE COLLABORATIVE NEARSHORE SWELL AND WIND FORECAST FOR OAHU /SRDHFO/ FOR MORE DETAILS. && .HFO WATCHES/WARNINGS/ADVISORIES... NONE. && MORRISON
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 Heavy Rain in Wisconsin, August 18, 2014
- Heat in Nevada, August 18, 2014
- Flash Flooding and Damaging Winds in California, August 18 to 21, 2014
- Flash Flooding and Flooding in Kentucky, August 18, 2014
- Flash Flooding and Flood in Utah, August 18 to 20, 2014
- Hail and Damaging Winds in Oklahoma, August 18, 2014
- Damaging Winds in Kansas, August 18, 2014
- Hail and Damaging Winds in Minnesota, August 18, 2014
- Damaging Winds in Georgia, August 18 to 21, 2014
- Damaging Wind in Alabama, August 18, 2014
- Damaging Winds in Florida, August 18, 2014
- Lightning Strike in North Carolina, August 18, 2014
More
Every storm in Hawaii in 2014Every state in 2014This day in weather historyWarnings in Hawaii, August 2014
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: 533925.