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Pacific ENSO Update

4th Quarter, 2011 Vol. 17 No. 4


HI Flag
State of Hawaii
Seasonal Precipitation Summary

The state of Hawaii has been very dry during the 3rd Quarter of 2011. Below-normal rainfall and warm weather has increased the drought intensity over leeward areas of the state. The Waimanalo Reservoir on Oahu has been rapidly decreasing and has dropped over 25 feet since early this year. Mandatory water restrictions will be implemented if this drop continues. As far as drought conditions go: On the Big Island and on Maui, drought area conditions have declined. Pastures, ranching operations and water supplies have been negatively affected. Molokai and lanai have reported no significant changes in the past month, however, general vegetation degradation and cutbacks in irrigation water consumption continue. Kauai has not reported any drought conditions. The below-normal rainfall has continued into October in the state of Hawaii with Honolulu, Kahului, and Hilo receiving only 19%, 18%, and 48% normal rainfall respectively.

Most locations in the islands of Hawaii are also experiencing a similar long-term decline of rainfall. Cloud formation by trade winds is the most reliable and abundant source of water in the Hawaiian Islands. However, rainfall in Hawaii has been steadily declined over the past twenty years.

Additional individual rainfall station information and specific island information for Hawaii can be found in the Monthly Precipitation Summaries.

Hawaii Rainfall Summary for Select Stations, 3rd Quarter 2011

Station  
Jul.
Aug.
Sep.
3rd Qtr
Lihue Airport
Rainfall (inches)
1.45
1.18
0.79
3.42
% of Normal *
86%
64%
41%
63%
Honolulu Airport
Rainfall (inches)
0.57
0.07
0.07
0.71
% of Normal *
158%
37%
12%
62%
Kahului Airport
Rainfall (inches)
0.63
0.19
0.08
0.90
% of Normal *
166%
40%
42%
86%
Hilo Airport
Rainfall (inches)
5.18
8.74
4.45
18.37
% of Normal *
54%
104%
48%
68%

* Hawaii normals are computed from 1981-2010 data.



Climate Outlook: The long lead Hawaiian Islands Outlook issued on October 20 by the NOAA Climate Prediction center indicated that probabilities favored above-normal precipitation during early 2012 as part of a forecasted mature phase of La Niña.

The next long-lead outlook will be issued by the Climate Prediction Center on November 17th.



Pacific ENSO Applications Climate (PEAC) Center
c/o NOAA NWS - Weather Forecast Office Honolulu
2525 Correa Road, suite 250
Honolulu, HI 96822
(808) 956-2324

Web Master's email: peac@noaa.gov
Page Last Modified: December 10 2011 02:01:30 GMT

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