No. 15: Spring 1981
December 10, 1980. Birmingham. An ice lump weighing 1 pound, 6 ounces (626 grams) fell into a garden at Kings Norton. The lump was almost spherical and had a circumference of 12 inches.
(Anonymous; "Ice-Ball Falls into a Birmingham Garden," Journal of Meteorology, U.K., 6:16, 1981.)
Reference. Large, fallen ice chunks are often called "hydrometeors." These are cataloged at GWF1 in Tornados, Dark Days. Ordering information here.