Heavy Rain, Hawaii
- When
- April 12, 6:14 PM HST to 11:41 PM HST
- Where
- Hawaii County, 2.27 mi W of Hawi to 2.74 mi SSW of Papaaloa
- Reported by
- Official NWS Observations
- Coordinates
- 20.230, -155.865
Heavy Rain in Hawaii, April 12 to 14, 2020
A decaying front over the eastern part of the Aloha State, along with nearby surface and upper troughs, triggered heavy downpours and isolated thunderstorms over portions of the Big Island, Oahu, and Maui. The heavy rain caused ponding on roadways, and small stream and drainage ditch flooding.
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
- 7
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 decaying front over the eastern part of the Aloha State, along with nearby surface and upper troughs, triggered heavy downpours and isolated thunderstorms over portions of the Big Island, Oahu, and Maui. The heavy rain caused ponding on roadways, and small stream and drainage ditch flooding. No serious 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 Apr 12, 3:20 PM HST, 2 hours 54 minutes earlier.
Area forecast discussion, Apr 12, 3:20 PM HST, 2 hours 54 minutes before
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</html>The radar
The national radar mosaic for the moment the first event began.
Event by event
7 heavy rain. Local standard time, as filed.
Heavy Rain, Honolulu
- When
- April 13, 10:29 AM HST to 2:40 PM HST
- Where
- Honolulu County, 1.73 mi N of Niu Valley to 3.68 mi SW of Punaluu
- Reported by
- Official NWS Observations
- Coordinates
- 21.325, -157.732
Heavy Rain, Maui
- When
- April 13, 5:53 PM HST to April 14, 2:10 AM HST
- Where
- Maui County, 1.54 mi ESE of Hookipa Bp to 2.28 mi NNW of Kipahulu
- Reported by
- Official NWS Observations
- Coordinates
- 20.919, -156.349
Heavy Rain, Maui
- When
- April 14, 2:12 AM HST to 4:23 AM HST
- Where
- Maui County, 1.43 mi SE of Nahiku to 2 mi NW of Kaupo
- Reported by
- Official NWS Observations
- Coordinates
- 20.816, -156.084
Heavy Rain, Honolulu
- When
- April 14, 3:10 AM HST to 8:00 AM HST
- Where
- Honolulu County, 0.87 mi SSW of Kamiloiki to 3.82 mi SW of Schofield Barracks
- Reported by
- Official NWS Observations
- Coordinates
- 21.308, -157.686
Heavy Rain, Hawaii
- When
- April 14, 3:28 AM HST to 11:55 AM HST
- Where
- Hawaii County, 4.77 mi SW of Papaikou to 6.9 mi SE of Hawaiian Ocean Vw Est
- Reported by
- Official NWS Observations
- Coordinates
- 19.730, -155.151
Heavy Rain, Hawaii
- When
- April 14, 3:40 PM HST to 5:27 PM HST
- Where
- Hawaii County, 3.32 mi N of Waikoloa Village to 3.69 mi ESE of Captain Cook
- Reported by
- Official NWS Observations
- Coordinates
- 19.978, -155.787
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
- Tornadoes and Flash Flooding in Mississippi, April 12, 2020
- Tornadoes and Flash Flooding in Georgia, April 12 to 13, 2020
- Tornadoes and Flash Flooding in Tennessee, April 12 to 13, 2020
- Tornado in Mississippi, April 12, 2020
- Tornadoes and Hail in Louisiana, April 12, 2020
- Tornadoes and Flash Flooding in Texas, April 12, 2020
- Tornadoes and Flash Flooding in Alabama, April 12 to 13, 2020
- Flash Flood and Damaging Winds in Mississippi, April 12, 2020
- Tornadoes and Flash Flooding in Alabama, April 12 to 13, 2020
- Tornadoes and Hail in Louisiana, April 12, 2020
- Flash Flooding and Debris Flow in Virginia, April 12 to 14, 2020
- Winter Storm in Minnesota, April 12 to 13, 2020
More
Every storm in Hawaii in 2020Every state in 2020This day in weather historyWarnings in Hawaii, April 2020
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 2026-10-01. Each event’s entry at NCEI: 879478, 880096, 879480, 879481, 879482, 879483, 879484.