Why do large damaging hailstones only occur during the summer time?

chapter

Astronuc

Lots of moisture in thunderclouds - cumulonimbus - with significant potential difference between head and base.

http://en.wikipedia.org/wiki/Hail

http://www.nssl.noaa.gov/primer/hail/hail_basics.html

http://www.ucar.edu/communications/factsheets/Hail.html
https://www2.ucar.edu/magazine/features/all-hail

http://www.youtube.com/watch?v=yS0F2_azlCA

http://www.srh.noaa.gov/jetstream/tstorms/hail.htm

http://www.erh.noaa.gov/cae/svrwx/hail.htm

CosmicEye

In short, it usually happens when hot moist air gets trapped under cold dry air when the 2 fronts meet ie a summer thunderstorm. Rain water rises to altitudes where it freezes. They clump together and updrafts keep the the clumps in these altitudes. The size of the hail depends on how strong the updrafts are until they are so heavy they fall.

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chapter	Why do large damaging hailstones only occur during the summer time? Why do large damaging hailstones only occur during the summer time?

CosmicEye	In short, it usually happens when hot moist air gets trapped under cold dry air when the 2 fronts meet ie a summer thunderstorm. Rain water rises to altitudes where it freezes. They clump together and updrafts keep the the clumps in these altitudes. The size of the hail depends on how strong the updrafts are until they are so heavy they fall.