Aug 26, 2025
Unusually rich monsoonal moisture was in place on the morning of August 26th, with precipitable water close to 1.00 inch across eastern Utah and western Colorado. A jet streak moving in aloft brought not only additional moisture, but some extra lift as well. In addition, daytime heating on the complex terrain in this region help to spur on afternoon convection. As a result, widespread shower and thunderstorm activity developed during the afternoon, producing localized very heavy rain and high ra
Source: NOAA National Weather Service Storm Events Database (event 1291259). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in San Juan County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.