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June 2013 Precipitation Summary
State of Hawaii
MONTH: June 2013
PREPARED: July 3, 2013
Note: This summary uses the arithmetic mean, or average, for “normal” rainfall values.
State: [Text data table for rain gages]
After a slow start, the Hawaiian Islands dry season got into gear and featured uninterrupted trade winds during the entire month of June. Daily rainfall occurred along most of the windward slopes but the amounts per day were low in most cases. Leeward areas across the state were very dry as expected given the time of year. Upper level low pressure systems and shower areas embedded within the trade wind flow boosted rainfall totals on a few days but did not cause any flooding problems.
Following a brief easing of drought on the Big Island in May, a revival of extreme drought occurred during June with a high likelihood of drought expansion and intensification expected over the coming weeks and months. For additional information, please see the latest Drought Information Statement at: http://www.prh.noaa.gov/hnl/pages/DGT.php
Island of Kauai : [June 2013 map] [year-to-date map]
Most of the rain gages on the island of Kauai reported below average rainfall totals for the month of June. The sites showing near to above average amounts were mainly on the upper windward slopes. The U.S. Geological Survey’s (USGS) Mount Waialeale gage had the highest monthly total of 28.39 inches (86 percent of average) and the highest daily total of 3.12 inches on June 23. Low elevation gages from Hanapepe to Mana indicated dry conditions with all totals from the area at less than 40 percent of the June average. At Lihue Airport, the daily rainfall frequency was above average while the average rainfall per day was less than half of average.
Rainfall totals for 2013 through the end of June were in the near average range at most of the gages on Kauai. The Mount Waialeale year-to-date total of 161.68 inches (86 percent of average) was the highest in the state.
Island of Oahu: [June 2013 map] [year-to-date map]
A majority of the gages on the slopes of the Koolau Range recorded near to above average monthly rainfall totals. In contrast, monthly totals from the slopes of the Waianae Range were mostly below average. The U.S. Fish and Wildlife Service’s Oahu Forest National Wildlife Refuge (NWR) gage posted the highest monthly total of 19.31 inches (116 percent of average) and the highest daily total of 6.24 inches on June 25. The Wheeler Army Airfield gage had its highest June total (2.80 inches, 135 percent of average), since 2003 (10.58 inches).
An interesting aspect of the June rainfall was that the rainfall gradient, or the change in rainfall amounts with distance, was higher than normal. Many of the sites closest to the crest line of the Koolau Range had near to above average totals while lower elevation leeward gages had below average totals. A sample pairing would be the Manoa Lyon Arboretum gage which recorded 16.10 inches, or 136 percent of the average for June, and the Aloha Tower gage, which recorded just 0.43 inches, or 45 percent of average.
Most of the gages on Oahu have recorded near to above average rainfall totals for 2013 through the end of June. The Oahu Forest NWR gage had the highest year-to-date total of 124.45 inches (117 percent of average), which was third highest statewide.
Maui County: [Maui June 2013 map] [year-to-date map] [Molokai/Lanai June 2013 map] [year-to-date map]
Most of the windward gages across Maui County reported near to above average rainfall for the month of June while nearly all of the leeward gages showed below average totals. The USGS’ Puu Kukui gage had the highest monthly total of 21.10 inches (72 percent of average) and the highest daily total of 2.51 inches on June 25. The Mahinahina gage on the leeward slopes of the West Maui Mountains recorded just 0.38 inches (18 percent of average) which registered as its driest June in a data archive going back to 1991.
Over half of the Maui County gages have recorded rainfall totals for 2013 through the end of June in the below average range. Puu Kukui’s year-to-date total of 138.83 inches (73 percent of average) was the highest in the county and the second highest in the state.
Island of Hawaii: [June 2013 map] [year-to-date map]
Nearly all of the gages on the Big Island had below average rainfall totals for the month. Mountain View’s gage recorded rainfall every day but its total of 7.15 inches was just 58 percent of average. Hilo Airport showed a near average daily rainfall frequency but a below average amount of rain per day, which made it 8 consecutive years with these conditions in June. The USGS’ gage at Kawainui Stream posted the highest monthly total of 10.70 inches (108 percent of average) and the highest daily total of 1.59 inches on June 2. Kapapala Ranch in the Kau District recorded just 0.10 inches for the month (5 percent of average) which made it the driest June since 1966. Upolu Airport’s 0.68 inches (24 percent of average) was the lowest June total in a data record going back to 1991.
Rainfall totals for 2013 through the end of June remained in the near to below average range across the Big Island. The rain gage at Kawainui Stream had the highest year-to-date total of 71.75 inches (92 percent of average) which was just ninth highest statewide.
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 state network 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