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NOAA > NWS > WFO HFO Home Page > Hydrology > June 2014 Precipitation Summary
June 2014 Precipitation Summary
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State of Hawaii

MONTH: June 2014

PREPARED: July 14, 2014

Note:  This summary uses the arithmetic mean, or average, for “normal” rainfall values.

State: [Text data table for rain gages]

The warm season arrived in earnest over the Hawaiian Islands during June with trade winds persisting at mainly moderate levels throughout most of the month.  The only significant break in the trades occurred at the beginning of the month, on June 1 and 2, as a surface low pressure trough moved into the area just west of Kauai.  This trough marked the tail end of a series of weather systems which interrupted trade wind conditions frequently during May.  Weather associated with the trough produced heavy rainfall over portions of Kauai on June 2.  Several rain gages recorded rates of 1 to 3 inches per hour but there were no reports of significant flooding problems.

After June 2, the uninterrupted trades produced rainfall daily, mostly along the windward and upper slopes of the islands.  Enhanced afternoon showers occurred along the Kona slopes of the Big Island on June 19 and 21, but no significant problems were reported.

Island of Kauai : [June 2014 map] [year-to-date map]

Most of the rainfall totals from Kauai were in the near to above average range for the month of June.  The U.S. Geological Survey’s (USGS) Mount Waialeale gage had the highest monthly total of 34.07 inches (104 percent of average) and the highest daily total of 5.27 inches on June 1.  Lihue Variety Station’s 7.30 inches marked its highest June total in a data record going back to 1996.  Anahola’s 2.98 inches (159 percent of average) and Hanapepe’s 2.52 inches (188 percent of average) represented the wettest June at both sites since 1996. 

The anomalous weather pattern at the beginning of June once again produced unusually wet conditions at the Mana gage in western Kauai.  This gage recorded 3.83 inches during the month, which was 10 times greater than the long term average.  Most of this total fell during the first 3 days of June.  While the existing site has been in service only since 2010, a discontinued gage nearby collected data from 1905 to 2000.  The last time the old site showed June rainfall at similar or higher levels was in 1934 when it posted 4.96 inches.

Most of the gages on Kauai had near to above average rainfall totals for 2014 through the end of June.  Mount Waialeale’s total of 129.73 inches (69 percent of average) was the highest year-to-date value on Kauai and moved up to second highest in the state.

Island of Oahu: [June 2014 map] [year-to-date map]

Most of the gages on Oahu recorded near to above average rainfall for the month of June.  The U.S. Fish and Wildlife Service’s Oahu Forest National Wildlife Refuge (NWR) gage had the highest monthly total of 15.36 inches (92 percent of average).  The USGS’ Poamoho No. 1 gage had the highest daily total of 2.19 inches on June 27.  Niu Valley’s 3.46 inches for the month represented the wettest June in a data record going back to 1991.  Totals from Kamehame (1.79 inches, 186 percent of average) and the Poamoho Experiment Farm (3.58 inches, 453 percent of average) marked the wettest June at both sites since 1996.

Rainfall totals for 2014 through the end of June were in the near to above average range at most of the gages on Oahu.  The Oahu Forest NWR gage had the highest year-to-date total of 120.75 inches (113 percent of average) but dropped down to third highest in the state.

Maui County: [Maui June 2014 map] [year-to-date map] [Molokai/Lanai June 2014 map] [year-to-date map]

June rainfall totals fell into the below average range at most of the sites across Maui County.  The USGS’ Puu Kukui gage posted the highest monthly total of 17.26 inches (59 percent of average) and the highest daily total of 3.17 inches on June 1.  Most of the Upcountry and leeward West Maui totals were less than 50 percent of the long term June average.

Despite the drier conditions recently, all of the Maui County totals for 2014 through the end of June remained in the near to above average range.  Puu Kukui kept its position as the wettest spot in the Hawaiian Islands so far in 2014 with a year-to-date total of 166.48 inches (87 percent of average).

Island of Hawaii: [June 2014 map] [year-to-date map]

Most of the Big Island gages reported near average rainfall totals for the month of June.  The USGS’ gage at Kawainui Stream posted the highest monthly total of 14.89 inches (151 percent of average) and the highest daily total of 1.50 inches on June 27.  Locations along the coffee belt in the North Kona and South Kona Districts reported good amounts of rainfall and continued the wet trend that started in May.  One of these sites is the Honaunau gage in the South Kona District.  This gage posted its highest June total (8.46 inches, 139 percent of average) since its 10.76 inches in June 1997.  Hilo Airport’s total of 6.57 inches (89 percent of average) was the highest June value since 2005.   The 10.27 inches in 2005 was the last time Hilo Airport had above average June rainfall.

Most of the gages on the Big Island had 2014 rainfall totals continuing in the near to above average range.  The USGS’ rain gage at Kawainui Stream had the highest year-to-date total of 111.61 inches (143 percent of average) but dropped down to fourth highest in the state.

Data Sources: Data used in this report are largely from National Weather Service sources including climate network weather observation stations at Lihue, Honolulu, Kahului, and Hilo, the Hydronet and Ua Net networks of automated rain gages, and selected Cooperative Observer sites.  Additional data come from automated rain gages operated by the State of Hawaii Department of Land and Natural Resources, the U.S. Geological Survey, the U.S. Bureau of Land Management, the U.S. National Park Service, the Department of Defense, the U.S. Fish and Wildlife Service, and the U.S. Department of Agriculture.  Averages come from the National Climatic Data Center (1981-2010 series) and the Rainfall Atlas of Hawaii (http://rainfall.geography.hawaii.edu/).  Data presented here are not certified and should be used for informational purposes only.

Kevin R. Kodama
Senior Service Hydrologist
NOAA/NWS Weather Forecast Office Honolulu