In Poland we have a proverb:
Kwiecien plecien, bo przeplata troche zimy, troche lata.
April weaves a dappled pleat, a little cold, a little heat.
On April 10th, afternoon, we got a sever weather warning. It was relatively warm, over 60 F. Suddenly there were gusty winds, gray-greenish clouds and few minutes later hail was banging all over:
The biggest pieces were about 1-1,5 cm in diameter.
Hail forms when strong currents of rising air, known as updrafts, carry water droplets high enough in a thunderstorm for the water droplets to freeze. Once hailstones grow large enough to begin falling despite the updraft that’s been holding them up, they hurtle toward the ground as fast as 90 mph.
It all happens in the lowest layer of Earth’s atmosphere: Troposphere.
Earth’s atmosphere. Project done by Teah in March’08.