Flash Flood — Washington, Utah

2025-07-18 · near Zion National Park, Washington, Utah

Event narrative

Zion NP ranger reported numerous waterfalls around the park that were the result of heavy rain.

Wider weather episode

A weak northern stream shortwave trough moving through the northwest CONUS resulted in the development of high based convection. Some of this convection resulted in strong to severe wind gusts. Additionally, a cutoff low placed off of the southwest CONUS helped advect moisture into southern Utah, leading to convection with periods of sufficiently heavy rain to result in flash flooding over some rain sensitive areas.

View location on OpenStreetMap → (37.3258, -113.0740)

Source: NOAA Storm Events Database, event_id 1270428. Narrative written by the NWS forecast office that issued the report.