Midwest Flooding by Much Precipitation All Winter & Spring Thick Snowpack Melted Quickly so What Caused All That?

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What do the global warming alarmists say about all the snow which fell this winter in the upper Midwest then prodigious rain this spring such that there now is all-time record flooding? Why did all that water in the form of snow and then rain fall from the sky? Obviously more clouds (vapor water) rolled in off the ocean, the surface temperature of which must have been elevated for more evaporation to form more clouds, perhaps heated by a temporary surge of solar output (not reported though), or by heating from below, the water column heated by volcanism on the seafloor.