Heavy Rain, Hawaii
- When
- August 7, 12:25 PM HST to 3:16 PM HST
- Where
- Hawaii County, Honomu
- Reported by
- OFFICIAL NWS OBS.
- Coordinates
- 19.602, -155.523 (the zone’s center; the record gives no point)
Heavy Rain in Hawaii, August 7, 2005
Heavy showers produced small stream and drainage ditch flooding, and ponding of roadways in windward sections of the Big Island of Hawaii. There were no reports of serious property damage or injuries.
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 windward sections of the Big Island of Hawaii. There were no reports of serious property damage or injuries.
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 7, 8:40 AM HST, 3 hours 45 minutes earlier.
Area forecast discussion, Aug 7, 8:40 AM HST, 3 hours 45 minutes before
HAWAIIAN ISLANDS FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE HONOLULU HI 840 AM HST SUN AUG 7 2005 UPDATED FOR FLASH FLOOD WATCH .SYNOPSIS... MOISTURE FROM A TROPICAL DISTURBANCE IS MOVING OVER THE BIG ISLAND OF HAWAII. ALSO...A LOW ALOFT NORTHWEST OF THE ISLANDS IS MAKING THE ATMOSPHERE UNSTABLE. AS A RESULT...THE BIG ISLAND WILL STAY CLOUDY AND RAINY THROUGH MONDAY. SOME OF THE RAIN WILL SPREAD OVER THE OTHER ISLANDS AS WELL. A SURFACE RIDGE TO OUR NORTH WILL KEEP TRADE WINDS BLOWING OVER THE ISLANDS. WITH TRADES BLOWING...SHOWERS WILL BE CONCENTRATED OVER WINDWARD AREAS...BUT THERE MAY BE AFTERNOON SHOWERS OVER THE LEEWARD SIDE OF THE BIG ISLAND. && .DISCUSSION... SATELLITE IMAGERY SHOWS OVERCAST LAYERED CLOUDS COVERING MOST OF THE WINDWARD SIDE OF THE BIG ISLAND. RADAR DATA...SURFACE OBSERVATIONS AND RAIN GAGE REPORTS SHOW THAT THESE CLOUDS ARE PRODUCING STEADY RAIN AND LOCALIZED HEAVY SHOWERS. OVER THE PAST 24 HOURS...MORE THAN 4 INCHES /4.02 INCHES/ OF RAIN HAS FALLEN AT MOUNTAIN VIEW AND OVER 3 AND 1/2 INCHES /3.60 INCHES/ OF RAIN HAS FALLEN AT PAHOA. THIS KIND OF RAINFALL IS LIKELY TO CONTINUE THROUGH TONIGHT AND POSSIBLY LONGER. FROM MAUI THROUGH KAUAI...SATELLITE LOOPS SHOW A PRETTY TYPICAL TRADE-WIND CLOUD PATTERN WITH ONLY SCATTERED CLOUDS OVER MOST AREAS AND BROKEN CLOUDS OVER THE WINDWARD SLOPES. A TROUGH ASSOCIATED WITH THE REMNANT OF TROPICAL DEPRESSION ONE-C IS OVER THE MAIN HAWAIIAN ISLANDS. AT 800 AM HST...A CLOUD VORTEX OR SPIRAL WAS CENTERED ABOUT 200 MILES SOUTH SOUTHEAST OF SOUTH POINT. A 120 MILE WIDE BAND OF SCATTERED THUNDERSTORMS EXTENDING ABOUT 450 MILES EAST OF THE VORTEX HAS BEEN NEARLY STATIONARY SINCE LAST NIGHT. A 90 MILE WIDE BAND OF SHOWERY BROKEN LOW CLOUDS AND ISOLATED TOWERING CUMULUS CLOUDS EXTENDS 575 MILES EAST NORTHEAST FROM OVER THE BIG ISLAND OF HAWAII. AT 800 AM HST A LOW ALOFT IS CENTERED ABOUT 500 MILES NORTHWEST OF KAUAI. THE LOW HAS BEEN MOVING EAST SOUTHEASTWARD OVER THE PAST 12 HOURS. THE GFS MODEL FORECASTS THE LOW TO CONTINUE MOVING IN THIS DIRECTION THROUGH TUESDAY MORNING. MOISTURE FROM THE TROPICAL DISTURBANCE AND INSTABILITY DUE TO THE LOW ALOFT WILL KEEP THE BIG ISLAND VERY WET THROUGH TOMORROW. SHOWERS WILL BE CONCENTRATED OVER WINDWARD AREAS BUT IT WILL BE UNSTABLE ENOUGH THAT THERE MAY BE HEAVY AFTERNOON CONVECTION OVER THE LEEWARD AREAS. THE ISLANDS FROM MAUI TO KAUAI WILL BE FAIRLY DRY TODAY...BUT SHOWERS WILL SPREAD NORTHWESTWARD TONIGHT AND TOMORROW. IT LOOKS LIKE THE HEAVY RAIN WILL BE RESTRICTED TO THE BIG ISLAND BUT WE WILL BE WATCHING FOR THE POSSIBILITY OF HEAVIER RAIN SPREADING TO MAUI COUNTY OR THE OTHER ISLANDS. A SURFACE RIDGE IS FORECAST TO REMAIN NORTH OF THE MAIN HAWAIIAN ISLANDS THROUGH THE WEEK SO TRADE WINDS WILL CONTINUE. THE LOW ALOFT DIGGING TOWARDS THE ISLANDS FROM THE NORTHWEST AND THE SURFACE TROUGH ASSOCIATED WITH THE REMNANT OF TROPICAL DEPRESSION 1C WILL COMBINE TO WEAKEN THE TRADE WINDS OVER THE ISLANDS. TRADE WINDS WILL REMAIN MODERATE THROUGH THE WEEK. && .HFO WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH FOR THE BIG ISLAND OF HAWAII. SMALL CRAFT ADVISORY FOR MAALAEA BAY AND WATERS SOUTH OF THE BIG ISLAND. && DONALDSON
In the hours before
Special weather statement, Aug 7, 12:15 PM HST, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HONOLULU HI 1215 PM HST SUN AUG 7 2005 HIZ023>026-080115- KONA-SOUTH BIG ISLAND-BIG ISLAND NORTH AND EAST-KOHALA- 1215 PM HST SUN AUG 7 2005 ...FLASH FLOOD WATCH CONTINUES FOR THE BIG ISLAND OF HAWAII... ...RAIN CONTINUES ON THE WINDWARD SIDE BIG ISLAND... STEADY RAIN CONTINUES OVER THE WINDWARD SIDE OF THE BIG ISLAND FROM HAMAKUA TO KAU BUT...SO FAR...CIVIL DEFENSE OFFICIALS HAVE REPORTED NO FLOODING. OVER THE PAST 24 HOURS...3 TO 5 INCHES OF RAIN HAS FALLEN OVER THE WINDWARD BIG ISLAND WITH 5.06 INCHES AT PAHOA. IN THE PAST 6 HOURS...PAHOA HAS RECEIVED 2.0 INCHES. SINCE THE ATMOSPHERE OVER THE ISLANDS IS UNSTABLE...THUNDERSTORMS MAY DEVELOP LATER TODAY AND PRODUCE LOCAL DOWNPOURS. SINCE THE WINDWARD SIDE OF THE BIG ISLAND HAS RECEIVED SO MUCH RAIN OVER THE PAST 24 HOURS...THE THREAT OF FLASH FLOODING IS GREATEST THERE...BUT THUNDERSTORMS COULD PRODUCE HEAVY ENOUGH RAIN TO PRODUCE LOCALIZED FLOODING OVER ANY LOWLAND AREAS OF THE BIG ISLAND. THE GREATEST THREAT FOR LEEWARD AREAS IS IN THE AFTERNOON AND EVENING SINCE DAYTIME HEATING INCREASES THE CHANCE FOR THUNDERSTORMS TO FORM. STAY TUNED TO NOAA WEATHER RADIO AND OTHER LOCAL MEDIA FOR THE LATEST INFORMATION. REPORT FLOODING TO POLICE OR CIVIL DEFENSE OFFICIALS FOR RELAY TO THE NATIONAL WEATHER SERVICE. DONALDSON
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
- Lightning Strike in Pennsylvania, August 7, 2005
- Hail and Damaging Winds in Kentucky, August 7, 2005
- Hail in Texas, August 7, 2005
- Damaging Winds in Kentucky, August 7, 2005
- Hail and Damaging Winds in Oklahoma, August 7, 2005
- Hail and Damaging Winds in Kansas, August 7, 2005
- Hail and Damaging Wind in Kansas, August 7, 2005
- Hail and Damaging Wind in Maryland, August 7, 2005
- Marine Thunderstorm Winds in Gulf of Mexico, August 7, 2005
- Wildfire in Oregon, August 7 to 10, 2005
- High Surf in Alaska, August 7, 2005
- Damaging Wind in Maryland, August 7, 2005
More
Every storm in Hawaii in 2005Every state in 2005This day in weather historyWarnings in Hawaii, August 2005
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: 5469481.