Page "Hail" Paragraph 6
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The Meteorological Service of Canada will issue severe thunderstorm warnings when hail that size or above is expected.
The US National Weather Service has a 2. 5 cm ( 1 in ) or greater in diameter threshold, effective January 2010, an increase over the previous threshold of ¾-inch hail.
Other countries will have different thresholds according local sensitivity to hail ; for instance grape growing areas could be adversely impacted by smaller hailstones.
Hailstones can be very large or very small, depending on how strong the updraft is: weaker hailstorms produce smaller hailstones than stronger hailstorms ( such as supercells ).
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