Earlier this month, Southwest Houston was warned that a Tropical Storm - dubbed Harvey - was headed for the Gulf Coast region.
Through Wednesday, the storm was expected to be nothing big. It downgraded first to a tropical depression, then merely a tropical wave, before picking back up and becoming a tropical storm again on Wednesday - two and a half days before landfall.
Over the next two days, things escalated quickly. The storm became a category 3 hurricane, then a category 4 within mere hours. By the time it made landfall late Friday evening, it was the strongest hurricane to hit the United States in over a decade.