Tropical Storm Harvey could dump nearly 2 more feet of rain around Houston by the time the slow-churning system finishes soaking the region, where the death toll — and floodwaters — continue to rise with little relief in sight.Confirmed deaths ranged from three to as many as 10 people amid Harvey’s unyielding downpours, according to reports, and forecasters say the storm that has inundated southeast Texas since the weekend could drop another 20 inches of rain by Thursday, driving totals to more than 50 inches.