"A hailstone with the diameter of roughly that of a grapefruit that hit Oahu on March 9, 2012, has been confirmed as the largest hailstone on record for the state of Hawaii.
“The final measurement of the hailstone was 4 1/4 inches long, 2 1/4 inches tall, and 2 inches wide,” said Michael Cantin, warning coordination meteorologist at NOAA’s National Weather Service in Honolulu, which, along with NOAA’s State Climate Extremes Committee, confirmed the new state record. “According to hail report records for Hawaii kept back to 1950 the previous state record hailstone was 1 inch in diameter.”
The record-setting hailstone was dropped by a “supercell” thunderstorm on the windward side of Oahu that also produced large hail in Kaneohe and Kailua. Numerous reports of hail with diameters of 2 to 3 inches and greater were reported. The National Weather Service investigated a hailstone reportedly larger than 3 inches in diameter, which was collected by a resident in the Aikahi neighborhood of Kailua. Upon inspection, it was apparent the stone was much larger”