According to the greatest Internet resource, a wet microburst is a “small-scaled downburst” that is “accompanied by significant precipitation”. I think that’s underselling it a bit because man, this wet microburst that popped off in Tucson, Arizona basically looks like the sky decided to drop all of its rain at one damn time, like a faucet turning on and never shutting off until it smashes everything underneath.
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The footage was captured by Bryan Snider. You can see other stunning videos of crazy weather here.