Jun 4, 2015
Severe thunderstorms broke out across Boulder, Denver, Elbert, Jefferson and Larimer Counties. Two large and long lived tornadoes developed in Larimer County near Berthoud and near Simla in Elbert County. The tornado that occurred along the Boulder and Larimer county line was rated an EF3 at it's highest damage point, with maximum winds estimated at 135 to 140 mph. The path length was 6 miles long with a width of one quarter mile at times. In Elbert County, 17 tornadoes touched down, with EF
Source: NOAA National Weather Service Storm Events Database (event 590711). 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.