Flash Flood in Canyon County, Idaho

Flash Flood June 26, 2026 · Canyon County, Idaho

$7.0M

Damage as recorded

Where the report was made, with tornadoes recorded within 15 miles over the years.

What the National Weather Service wrote

Timing estimated by MRMS, polygon focused on the area with the largest impact and intentionally kept broad. Numerous reports received of flooded roadways, some impassable; flooding also affected houses, public buildings, and infrastructure. The Caldwell Airport ASOS reported 1.06 inches of rainfall having fell in 15 minutes. A disaster was declared for Canyon County in the aftermath. There was an estimated 7 million dollars in damages to infrastructure.

The wider storm

Following a morning cold front, clearing skies allowed for weak to moderate instability (500-1000 j/kg of CAPE) to build in across SW Idaho. With an upper trough just to the west, dynamics and kinematics were favorable for thunderstorm development. The 00z sounding that afternoon revealed a precipitable water value of 0.96 inches, well above the 90th percentile value of 0.83 inches. With high moisture values, heavy rain was a threat with any storms that developed.

Began near Caldwell (43.6604, -116.7253).

Source: NOAA Storm Events Database, event 1357475. Narratives are written by the National Weather Service forecast office that issued the report.

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