Darby Weakens to a Tropical Depression; Dumps Flooding Rain Over Oahu, Hawaii

July 25,2016
Darby may have weakened to a tropical depression, but it unleashed flooding rain in parts of the Hawaiian Islands late Sunday into Monday.
Bands of heavy rain on the east side of Darby's circulation hammered parts of Oahu Sunday night into early Monday, triggering flash flooding.

Current radar and winds

According to gauge data, parts of Oahu picked up over 7 inches of rain in just 3 hours late Sunday night and early Monday, leading to flooding of a section of the H-1 freeway in the city of Honolulu, among other flooded roads.

Here are some 24-hour rainfall totals from Darby (ending at 3 a.m. HST Monday).

Location	Rainfall (Inches)
Moanalua, Oahu	11.09
Luluku, Oahu	10.81
Manoa Lyon Arboretum, Oahu	8.88
Kaupo Gap, Maui	3.82
Kilohana, Kauai	3.30

More impacts from Tropical Storm Darby can be found here. 

Details on this forecast can be found below.

Darby's Forecast

Darby's center was located about 75 miles west of Barking Sands, Hawaii, as of midday Monday, Hawaii time.

Storm Status

Darby is expected to weaken to a post-tropical remnant low by Tuesday as it continues pulling northwest away from the Hawaiian Islands.

Projected Path

(MORE: Hurricane Season Outlook | Hurricane Central)

The threat of localized flash flooding and landslides will continue through Monday, primarily in Oahu and Kauai.

Another 1 to 3 inches of rain, with isolated higher amounts, is possible Monday, according to the Central Pacific Hurricane Center.

Additional Rainfall Forecast

Some of this rainfall is not entirely a bad thing. Most leeward locations of the islands are reporting at least moderate drought.

Darby's History

Tropical Storm Darby made landfall as a 40 mph tropical storm on the Big Island near Pahala on July 23 very close to where Iselle made landfall in 2014. 

Sustained winds of 43 mph and a gust to 61 mph were reported at Kohala Ranch on the Big Island. Heavy rain and a wind gust to 45 mph was recorded at Lanai City, Hawaii on Saturday.

A gust to 56 mph was recorded at the Oahu National Wildlife refuge on Saturday night.

Darby generated winds that knocked down trees and power lines and heavy rain that produced localized flooding on the Big Island and on Maui.

There were some road closures and minor property damage on both islands. Hawaii Department of Civil Defense reported that Highway 11 was closed closed at mile marker 59 near Kawa Flats due to flooding. 

Darby reached its peak intensity as a Category 3 last Saturday afternoon. According to Dr. Phil Klotzbach, Darby is the fifth consecutive east Pacific use of the name "Darby" that has reached major hurricane status. 

MORE: Darby Swamps Hawaii (PHOTOS)