'Large, damaging hail': Severe thunderstorm warning issued for Canterbury

Hail could be larger than 20mm in diameter.

Christchurch severe thunderstorm warning: Threat of large damaging hail — NZ Herald · Right
'Large, damaging hail': Severe thunderstorm warning issued for Canterbury — RNZ — News
Thunderstorm hits Canterbury, dropping massive hailstones — Stuff.co.nz

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