Sep 11, 2013
A deep southerly flow over Colorado, ahead of a near stationary low pressure system over the Great Basin, pumped copious amounts of monsoonal moisture into the area. In addition, a weak stationary front stretched along the Front Range Foothills and Palmer Divide. As a result, a prolonged period of moderate to heavy rain developed across the Front Range Foothills, Palmer Divide, Urban Corridor. By the 14th, storm totals ranged from 6 to 18 inches, highest in the foothills of Boulder County. T
Source: NOAA National Weather Service Storm Events Database (event 473899). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Boulder County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.