41. Once they become too heavy for updrafts to support, hailstones careen toward earth. 42. The resulting ice nuclei enter clouds, providing vast opportunities for hailstones to form. 43. Once they become too heavy for updrafts to support, hailstones plummet to earth. 44. A torrential storm in Johannesburg covered the Wanderers stadium in white hailstones late Sunday. 45. Unlike ice pellets, hailstones are layered and can be irregular and clumped together. 46. The size of hailstones is best determined by measuring their diameter with a ruler. 47. Hailstones can grow to and weigh more than.48. Four days later, the carriers launched their planes as part of Operation Hailstone . 49. Rev . J . Hailstone , David Mushet, Thomas Biddle and Arthur Aikin. 50. The seventh bowl results in a devastating earthquake followed by giant hailstones ( ).