I wouldn't claim global warming just yet, if this becomes the new norm, and not just a freak 500yr event, then we can be concerned.
Remember when Katrina was supposed to be the new norm according to "scientists"?
Weather gonna do crazy weather type things. This could be a 500yr cycle, 1000yr, 1500yr, 10000yr.
I'm not saying Global Warning is/isn't a thing but it definitely can't be proven as the cause.
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How's that hail for ya?