Public Information Statement
Issued by NWS Honolulu, HI

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NOHW40 PHFO 170312 AAC

Public Information Statement...UPDATED
National Weather Service Honolulu HI
512 PM HST Mon Apr 16 2018



EVENT SUMMARY... An upper level low pressure system which tapped
into enhanced moisture in the lower levels of the atmosphere
produced torrential rainfall and severe flooding over portions of
the state from late Friday, April 13, through Sunday, April 15.
Impacts on April 13 were mainly over east Oahu as a result of a
strong thunderstorm which affected the area from 7 PM to 9 PM HST.
Severe localized flooding affected communities from Maunawili to
Waimanalo over the windward slopes, and from Aina Haina to Hawaii
Kai along the leeward slopes.

Kauai suffered the worst impacts in the state from the storm
event. Heavy rainfall started late Saturday, April 14 and
continued through the evening of April 15. Communities west of
Princeville were cut off from the rest of the island. Severe
flooding also occurred over the east and south sides of the island
during different phases of the event. The windward slopes of the
Big Island had periods of heavy rainfall during the weekend. A few
roads were closed by flooding in the South Hilo and Puna
Districts early Sunday morning.

Please refer to the Local Storm Report Summary for more specifics
on individual reports throughout the event at:

Here are significant rainfall totals from Kauai, Oahu, and the Big
Island during the 48-hour period ending at 6 PM HST on April 15,
2018. All values are in inches.

Wainiha               : 32.35
Hanalei               : 28.41
Mount Waialeale       : 22.34
Princeville Airport   : 14.60
Kilohana              : 13.19
North Wailua Ditch    : 10.62
Kapahi                : 10.12
Wailua                :  8.21
Lihue Variety Station :  3.36
Anahola               :  3.20
Lihue Airport         :  1.92
Kalaheo               :  1.55

Manoa Lyon Arboretum  : 11.96
Nuuanu Upper          :  7.88
Niu Valley            :  5.64
Maunawili             :  5.58
Waimanalo             :  5.02
Olomana Fire Station  :  4.70
Kamehame              :  3.53
St. Stephens          :  3.46
Bellows               :  3.21

Big Island
Pahoa                 :  5.60
Mountain View         :  5.51
Saddle Road Quarry    :  5.21
Waiakea Uka           :  4.50
Piihonua              :  4.25
Waiakea Exp. Station  :  3.88
Hilo Airport          :  3.05
Glenwood              :  3.01
Papaikou Well         :  2.30

In addition to the automated site totals, a volunteer observer
with the Community Collaborative Rain, Hail, and Snow Network, or
CoCoRaHS, reported 36.49 inches at Wainiha during the 24-hour
period ending at 7 AM HST on April 15.

The peak 24-hour rainfall at Hanalei was 28.15 inches as of 2 AM
HST when the gage stopped reporting. The record 24-hour rainfall
at this site is 28.54 inches for the period from 4 AM HST March 4,
2012 to 4 AM HST March 5, 2012. While the current event total was
slightly less than the record, it is highly likely that this
record was broken by heavy rainfall after the gage stopped

The Wainiha total of 19.54 inches for the 24-hour period ending at
4 PM HST is a record for this site, breaking the previous long
term record of 16.70 inches from January 6, 1969.


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