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The 4.25 inch hailstone -- a Hawaiian record -- was produced by a very rare supercell thunderstorm that also generated a tornado.
A grapefruit-size hailstone that pummeled Oahu during a hailstorm this month has now been confirmed as the largest on record for the state of Hawaii, announced officials with the National Oceanic and Atmospheric Administration (NOAA).
A final measurement of the hailstone, which dropped from the skies on March 9, places it at 4.25 inches long, 2.25 inches tall and 2 inches wide (10.8 by 5.7 by 5 centimeters).
"According to hail report records for Hawaii kept back to 1950, the previous state record hailstone was 1 inch in diameter," Michael Cantin, warning coordination meteorologist at NOAA's National Weather Service (NWS) in Honolulu, said in a statement. The NWS, along with NOAA's State Climate Extremes Committee confirmed the new state record
www.wrcc.dri.edu...
Hail falls somewhere in Hawaii between five and ten times in the average year. Almost always it is quite small – one-fourth inch or less in diameter – but on several occasions hail the size of marbles, and discs about five-eights of an inch in diameter, have been reported. Trees and leafy crops have been battered by hail from time to time, but this is an infrequent occurrence and the area affected are small. Many lifelong residents of Hawaii have never experience hail in these islands.
news.discovery.com...
In fact, since records began, there have been no reports of hail larger than an inch in diameter; penny-size (just under an inch) or quarter-size (1 inch in diameter) hailstones, have been reported just eight times in Hawaii. Conditions needed to produce supercell thunderstorms, and thus to form large hailstones, the size of golf balls and baseballs, are rare in Hawaii.