Heavy Rain in Hawaii, July 26 to 27, 2014

Name: Heavy Rain in Hawaii, July 26 to 27, 2014
Start: 2014-07-26T22:24
End: 2014-07-27T00:09
Location: Hawaii

July 26 to 27, 2014 · NWS HFO · 1 event in 1 county or zone

With the aid of an upper trough in the area, showers moving over East Oahu became enhanced. 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

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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.

With the aid of an upper trough in the area, showers moving over East Oahu became enhanced. The rain caused small stream and drainage ditch flooding, and ponding on roadways. 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 Jul 26, 8:30 PM HST, 1 hour 54 minutes earlier.

Area forecast discussion, Jul 26, 8:30 PM HST, 1 hour 54 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST SAT JUL 26 2014

.SYNOPSIS...
HIGH PRESSURE RIDGE NORTH OF THE ISLANDS WILL MAINTAIN MODERATE
TRADE WINDS TO THE ISLANDS. SHOWERS CARRIED BY THE WINDS WILL AFFECT
MAINLY WINDWARD AND MAUKA AREAS. WINDS MAY STRENGTHEN SOMEWHAT BY
EARLY NEXT WEEK.

&&

.DISCUSSION...
THE AREA OF MOISTURE THAT IS SUPPOSED TO SPREAD ACROSS THE ISLANDS
THIS EVENING TOOK A PATH FURTHER NORTH EARLIER THIS AFTERNOON.
THEREFORE THE BULK OF THE MOISTURE WILL NOW PASS NORTH MISSING THE
STATE. BUT THEN LATEST SATELLITE IMAGERY STILL SHOWS SOME PART OF
THIS MOISTURE REACHING THE CENTRAL ISLANDS THIS EVENING...AFFECTING
MAINLY OAHU. RADAR DATA ALSO SHOWED A LINE OF SHOWERS MOVING ACROSS
WINDWARD OAHU AT TIME...WHILE MORE SHOWERS WILL REACH OAHU IN THE
NEXT FEW HOURS. IT CERTAINLY FELT A LITTLE MORE MUGGY IN THE OUTDOOR
TODAY...AS DEW POINTS ONCE AGAIN EDGED UP WITH THE INCREASING
MOISTURE. THERE IS AN UPPER LEVEL TROUGH IN THE ISLAND VICINITY THIS
EVENING. THIS RESULTS IN THE AIR MASS BECOMING A LITTLE MORE
UNSTABLE OVER THE STATE. AS SUCH...ATMOSPHERIC CONDITIONS ARE
FAVORABLE FOR WETTING RAIN TO DEVELOP. EXPECT PASSING SHOWERS TO
AFFECT THE ISLANDS THROUGH REST OF THE EVENING INTO EARLY SUNDAY
MORNING...ESPECIALLY FOR OAHU THIS EVENING...THEN KAUAI OVERNIGHT.

A SURFACE HIGH PRESSURE RIDGE WILL REMAIN NORTH OF THE STATE PRETTY
MUCH THROUGH THE COMING WEEK. ALTHOUGH THE RIDGE IS NOT VERY
STRONG...PRESSURE GRADIENT ACROSS THE STATE REMAINS SOMEWHAT TIGHT
AS LOW PRESSURE SYSTEMS PASSING SOUTH OF THE ISLANDS WILL HELP
MAINTAINING THE GRADIENT. REGARDLESS...MODERATE TRADE WINDS WILL
PREVAIL THROUGH NEXT WEEK...AND WILL FLUCTUATE A BIT AT TIMES.
OVERALL...TRADE WIND WEATHER IS TO PREVAIL THROUGH NEXT WEEK...WITH
PASSING SHOWERS AFFECTING MAINLY WINDWARD AND MAUKA AREAS.

LATEST MODEL GUIDANCE STILL SHOWS A DRIER AIR MASS ACROSS THE STATE
BY THE MIDDLE OF NEXT WEEK. THIS WILL BE SHORT-LIVED AS ANOTHER
SURGE OF TROPICAL MOISTURE FROM THE SOUTHEAST IS EXPECTED TOWARDS
THE NEXT WEEKEND. THEREFORE THE STATE MAY SEE MORE STICKY WEATHER
WITH INCREASING SHOWERS.

&&

.AVIATION...
AN AIRMET FOR MOUNTAIN OBSCURATION HAS BEEN ISSUED FOR WINDWARD
OAHU...WHERE A PLUME OF SHOWERS STREAMING OFF MOLOKAI WILL PRODUCE
PERIODS OF MVFR CONDITIONS INTO THE OVERNIGHT PERIOD. ELSEWHERE...
SCATTERED SHOWERS AND ISOLATED MVFR CONDITIONS WILL AFFECT WINDWARD
SLOPES OVERNIGHT AND SUNDAY MORNING. VFR CONDITIONS WILL PREVAIL
ELSEWHERE INCLUDING MOST OF THE TERMINALS. AN AIRMET FOR LOW LEVEL
TURBULENCE MAY BECOME NECESSARY ON SUNDAY...WHEN THE INVERSION IS
FORECAST TO STRENGTHEN ALONG WITH A SLIGHT INCREASE IN THE TRADE
WIND FLOW.

&&

.MARINE...
WINDS MAY INCREASE TO SMALL CRAFT ADVISORY LEVELS BY SUNDAY OR
SUNDAY EVENING ACROSS THE TYPICALLY WINDIER AREAS AROUND MAUI COUNTY
AND THE BIG ISLAND. SMALL CRAFT ADVISORY WIND CONDITIONS MAY PREVAIL
IN THOSE AREAS POSSIBLY THROUGH MUCH OF NEXT WEEK.

A SMALL SSW SWELL MAY PRODUCE A MINOR BUMP ON SOUTH FACING SHORES
THROUGH SUNDAY. SHORT PERIOD TRADE WIND SWELL WILL CONTINUE ACROSS
EAST FACING SHORES...POSSIBLY INCREASING A BIT EARLY NEXT
WEEK IF TRADES STRENGTHEN. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED
THROUGH THE NEXT SEVERAL DAYS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

AVIATION...JACOBSON
REST...HUI

The radar

The national radar mosaic for the moment the first event began.

Open the radar archive at this moment

Event by event

1 heavy rain. Local standard time, as filed.

Heavy Rain, Honolulu

When: July 26, 10:24 PM HST to July 27, 12:09 AM HST
Where: Honolulu County, 0.29 mi NNE of Kaimuki to 0.27 mi ESE of Kalihi
Reported by: Official NWS Observations
Coordinates: 21.284, -157.818

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

Every storm in Hawaii in 2014 Every state in 2014 This day in weather history Warnings in Hawaii, July 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: 528483.