When the rising ice crystals collide with graupel ( soft hail ), the ice crystals become positively charged and the graupel becomes negatively charged.
2.
Tapioca snow, usually referred to as snow pellets, soft hail or graupel by meteorologists, consists of white, opaque particles of ice that have a snow-like structure.
3.
I remember one occasion where soft hail ( graupel ) fell in the summer in Northern Ontario, and it was reported as 27C ( 80F ) and snow, but actual snow doesn't fall at those temperatures.
4.
On Tuesday afternoon, the temperature at Buffalo, N . Y ., plummeted to 39 degrees as a heavy shower of soft hail and chilly rain punctuated the arrival of the coldest air mass of the young season.
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