Thunderstorm shook Treasure Valley Tuesday night — but most lightning didn’t hit the ground

A severe thunderstorm that passed over Eagle and north Boise at about 10 p.m. Tuesday night produced a spectacular light show.

The National Weather Service reports that there were 26 cloud-to-ground lightning strikes before midnight, and another 41 strikes after midnight. On Wednesday morning, its meteorologists had not heard of any reports of fires, damage or injuries from the strikes.

Just as impressive were the cloud-to-cloud flashes during the storm – and there were many more of those. (Read about the different types of lightning on the website for the National Severe Storms Laboratory).

The largest number of flashes occurred between 9 to 10 p.m., when 869 were recorded. From 10 to 11 p.m., there were 620, and another 60 from 11 p.m. to midnight.

“It was clear around the storm,” said Weather Service meteorologist Korri Anderson. “You could see the top of the thunderstorm head, and all of that. It was pretty spectacular, I thought.”

The storm, which came out of the northwest, moved southeast. It weakened over the Boise Foothills and Lucky Peak area. It died off at about 12:30 a.m. over Arrowrock Reservoir, Anderson said.

Emergency dispatchers for Ada, Boise, Canyon and Elmore counties said they did not hear of any reports of fire, damage or injury due to the storm. Neither did the Boise National Forest, said spokesman David Olson.

Valley residents woke to more thunder and lightning Wednesday morning, and more were expected later Wednesday.

By Thursday, the storms should be mainly in the mountains, Anderson said. The storms haven’t affected the forecast for the weekend, with highs close to 90. Stormy weather is expected to return next week.