Canyon storm history

One man was killed instantly when struck by lightning while moving an aluminum irrigation pipe on an alfalfa farm near Sunnyslope. A second man, standing about four feet away, received serious burns to the head and shoulder.

The 24 hour rainfall total was 0.73 inches at station ID CY 34.

Minor flooding was reported on Highway US-95 from Mile Post 0-35.

Heavy rain reported within a few hours.

Two boats capsized from thunderstorm outflow wind and subsequent waves on Lake Lowell. One person had to be rescued.

A portion of a metal roof was ripped off of an aircraft hangar.

A member of the public submitted a photo of this on social media.

This photo was submitted on social media and the time was estimated from radar.

The Mesonet station, FW5367, in Nampa measured 1.08 inches of total rainfall.

This was a public report form the Meteorological Phenomenon Identification Near the Ground.

A member of the public submitted a photo on social media.

A public report indicated that cropland, a yard, and a basement was flooded due to nearby rivers and creeks overflowing from heavy rain.

Blue Spruce tree 50 feet tall uprooted in thunderstorm outflow.

Damage was widespread across the valley including downed trees of various sizes.

The public in Caldwell reported several large trees and power lines down.

Trained spotters south of Caldwell reported lime and half dollar sized hail.

A trained spotter just west of Wilder reported large tree branches down due to thunderstorm outflow winds.

A retired National Weather Service employee reported very strong winds gusts and damage associated with nearby thunderstorms. Numerous reports of downed trees and power lines were received through social media.

Social media reported a 60 foot tall Blue Spruce tree was uprooted near Parma.

The Boise River remained in flood during the entire month of May due to planned release from Lucky Peak dam. Regulated flows were above flood stage for 101 days resulting in extensive bank erosion and flooding of lowlands along the river.

Planned releases from Lucky Peak Reservoir for flood control ranged from 7800 CFS to 8900 CFS during the month of April. The prolonged flood flows caused extensive damage along the river banks and widespread flooding of lowlands.

The Army Corps of Engineers and Bureau of Reclamation increased regulated flows from Lucky Peak Reservoir putting the Boise River in flood for the remainder of the month of March. Flooding was expected to continue through late spring. The extended period of flood flows caused sev…

A trained spotter reported 4 inch tree branches down on numerous trees from thunderstorm gusts. Lightning struck a fence post causing the post to catch on fire.

A National Weather Service employee reported flash flooding in Nampa and a trained spotter reported an inch and a half of rainfall in 30 minutes south of Nampa.

A retired NWS employee reported roof shingles blown off homes in the area.

Regulated flows on the Boise River increased above flood flow (7,000 cfs) on April 28, and were reduced below flood flow on May 15. Flood impacts were minor. Lowland flooding occurred along the river from Boise downstream through Caldwell to Parma. Sections of the greenbelt path …

A National Weather Service employee reported one inch size hail and damage to vehicles.

Several reports of downed trees and fences and damage to homes were received from local media.

A coop observer in Nampa reported a fence blown over and a 6 inch diameter tree uprooted.

A trained spotter in Nampa, Idaho reported three quarter inch hail.

A measured gust of 51 MPH was reported, but tree and shingle damage, and extensive blowing dust point to a likely wind in excess of 58 MPH from the storm.

A trained spotter reported wind gusts to 60 MPH with trees blown down and heavy rain.

Quarter Sized Hail Reported.

Penny and Nickel Sized Hail Reported.

Retired USAF weather forecaster reported nickel size hail.

Wind Gust measured by home weather station at 68 M.P.H

Sunnyslope Market

High winds blew down trees and damaged power lines which knocked out power to over 8000 homesas well as traffic signals, tying up traffic in Canyon County during the afternoon and evening. Heavy rain also caused street flooding in Nampa and Caldwell.

A gust of 54 knots was also reported from this site.