Severe thunderstorms and hail flooded roads across southwest Idaho on June 28, prompting emergency response in Canyon County, road closures in Payette County, and overnight cleanup in Ada County.
Severe thunderstorms, hail and flash flooding swept through parts of southwest Idaho on June 28, flooding suburban streets in the Boise area and creating immediate travel hazards on the first full summer weekend of 2026.
National Weather Service lead meteorologist Josh Smith said some northwest Meridian locations had several inches of small hail on the ground. He said the hail likely worsened the flooding because it melted quickly while more than an inch of rain fell and drains could not keep up.
Ada County recorded 100 lightning strikes in a single day, which Smith described as the second-most ever recorded on one June day since 2000. Owyhee County recorded 553 strikes.
Local Response
Canyon County declared a countywide disaster emergency as crews and officials dealt with storm damage and blocked roads.
The Ada County Highway District worked overnight clearing flooded roads and other hazards. The Boise Police Department urged drivers to use extreme caution after sharing photos of roadways that looked like rivers.
Payette County also reported mudslides and highway and street closures tied to the flooding.
What Officials Are Watching
The main open questions are whether anyone was injured, how much damage the storm caused, and when any closures in Payette County will fully reopen.
Further updates from county officials and the National Weather Service will determine whether additional warnings follow or whether cleanup and damage assessments become the focus.
Revision note
Initial automated publication.