MuskogeePhoenix.com, Muskogee, OK

Oklahoma News

July 25, 2013

Tulsa storm labeled derecho

— TULSA (AP) — A violent storm system packing up to 80 mph winds and lightning that churned through the Tulsa area early Wednesday was later classified by meteorologists as a rare derecho because of the widespread wind damage it left throughout the city.

Meanwhile, nearly 70,000 homes and businesses in Tulsa County were still without electricity Wednesday afternoon — the total was more than 100,000 at the storm’s peak — and utility officials said it could be several days until all power is restored.

Authorities said one firefighter was injured while operating a chain saw to clean up debris, but the injuries weren’t life-threatening. No other injuries were reported.

National Weather Service meteorologist Karen Hatfield said derechos are a special type of damaging storm event that have consistent reports of wind damage or measured wind gusts of 58 mph or more for at least 250 miles.

Hatfield said forecasters at the weather service only informally discussed the possibility of the weather event but did not use the term in forecasts, instead opting to use layman’s terms in their prediction of a severe and damaging wind event.

Adding to the difficulty of classifying a possible derecho ahead of time, the classification typically comes after extensive field work to survey the wind damage to estimate how widespread it was, she said.

“They are not common,” she said. “Typically across the country, there are only a handful of derechos every year.”

The storm snapped power lines and decades-old trees and left tens of thousands of homes and businesses without electricity.

“It was the most amazing sound I’ve heard in a long time,” recounted resident Sherry Bruster, who’s lived in her midtown home since 1981. “I thought the roof was going to go.”

A new batch of potentially violent thunderstorms could hit the same area when they are forecast to clip eastern Oklahoma late Thursday and early Friday, according to the National Weather Service in Tulsa.

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