Bridge collapses in Seneca, motorists rescued, serious flooding in area as more than 6 inches – ‘A pretty incredible amount of rain’ – falls in 3 hours, forecasters say

According to the weather service, there were several meteorological factors that contributed to the storm, including high atmospheric moisture, a slow-moving pressure system, a near-stationary warm front that had lifted north during the day and “was parked in the area of the heavy rain on Monday evening.”