cataclysm

current, river, stream, tide

cloudburst, discharge, flush, gush, outflow, outpouring

flux, inflow, influx

engulfment, washout

avalanche, blizzard

cascade, waterfall

excess, glut, overabundance, overage, overkill, overmuch, oversupply, superabundance, superfluity, surfeit, surplus

bloodbath, collapse, crash, meltdown

Armageddon, doomsday, end-time

convulsion, paroxysm, upheaval

accident, casualty, fatality

misadventure, mischance, misfortune, mishap

blast, blow, double whammy, one-two (or one-two punch)

insurgency, insurrection, mutiny, overthrow, overturn, rebellion, revolt, revolution, subversion, unrest, uprising, upset

fit, seizure, spasm

eruption, flare-up, outbreak, outburst

bluster, bobbery, bustle, coil, commotion, furor, furore, fuss, hubbub, hullabaloo, hurly-burly, pandemonium, rout, row, ruckus, ruction, rumpus, shindy, squall, stew, stir, to-do, turmoil, welter, williwaw

quaking, rocking, shaking, trembling