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I'm seeing numerous--and presumably incorrect--news reports that #Guadalajara, Mexico received "2 meters" (6.5 feet) of #hail accumulation during a thunderstorm. While the photos do show extremely impressive piles of hail, there's lots of evidence in photos/video that... (1/n)
...these enormous #hail drifts are almost certainly the result of an urban flash flood during hail-producing thunderstorm, which washed huge volumes of hail ice from around city into culverts & low-lying areas. Ice floats, so it can go wherever floodwaters do. (2/n) #Guadalajara
There are numerous documented reports of very deep hail drifts due to transport by floodwaters. A spectacular example occurred in desert of New Mexico in summer 2003. During that event, flash flooding washed hail into "glaciers" 15 feet tall! wunderground.com/cat6/record-ha… #NMwx (3/n) 
Finally, people have noticed how strange it is for ice to fall from the sky during summer. Believe it or not, the warm summer season is peak hail season in most places because hail requires tall thunderstorm clouds to form. These are rare in winter, but common in summer. (4/n)
That's not to say the event in #Guadalajara is not extremely impressive or did not have major local impacts. But this is not some "Day After Tomorrow" happening--events like this happen every year somewhere in world (though usually not in major low-latitude urban areas). (5/end)
