Severe Hailstorms and Historic Rainfall Hit Southern and Western Finland, Causing Widespread Flooding and Rare Weather Phenomenon

A powerful thunderstorm swept through parts of Finland on Sunday, bringing destructive hail—including rare ice shards—near-record rainfall, and hazardous driving conditions to regions including Southern Ostrobothnia, Pirkanmaa, and areas near Turku. The extreme weather caused localized damage, left residents stunned by its intensity, and resulted in significant urban flooding due to rainfall amounts exceeding the capacity of stormwater drainage systems (Ilta-Sanomat). The slow-moving nature of the thunderstorms, which lingered over the same areas for hours, contributed to the exceptional rainfall totals, a phenomenon described as rare by meteorologists (Yle).