Tags: Big | Storm | midwest

Super Storms Pelt Midwest with Rain, Winds, Hail

Wednesday, 12 Jun 2013 06:10 PM

 

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An unusually massive line of storms packing hail, lightning and tree-toppling winds was rolling through the Midwest on Wednesday and could affect more than one in five Americans from Iowa to Maryland.

Meteorologists were even warning about the possibility of a weather event called a derecho (deh-RAY'-choh), which is a storm of strong straight-line winds spanning at least 240 miles. The storms are also likely to generate tornadoes and cause power outages that will be followed by oppressive heat, said Russell Schneider, director of the National Weather Service's Storm Prediction Center in Norman, Okla.

The weather service issued tornado warnings in several counties in Iowa, Illinois and Wisconsin. The National Weather Service said a tornado touched down near Belmond, about 90 miles north of Des Moines, but it wasn't immediately clear if it caused any damage or injuries.

"We're becoming increasingly concerned that a major severe weather event will unfold," Schneider said. "The main thing is for folks to monitor conditions and have a plan for what to do if threatening weather approaches."

For the first time this year, the center was using its highest alert level for parts of Iowa, Illinois, Indiana and Ohio. In Chicago, Wednesday night's White Sox game against the Toronto Blue Jays was postponed in anticipation of bad weather and airlines canceled more than 120 flights at O'Hare International Airport.

The storms were expected to push into northwest Indiana early Wednesday evening.

The Northern Indiana Public Service Co., the region's largest utility, said it was increasing staff at its customer call center and scheduling extra work crews to handle any outages.

In Pennsylvania, Pittsburgh was adding public safety and public works personnel and repositioning some equipment to prepare for possible flooding or downed trees and wires, the Pittsburgh Post-Gazette reported.

All told, the area the weather service considers to be under heightened risk of dangerous weather includes 74.7 million people in 19 states.

Tornadoes and a derecho can happen at the same time, but at any given place Wednesday the straight-line winds are probably more likely. Straight-line winds lack the rotation that twisters have, but they can still cause considerable damage as they blow down trees and other objects.

"Be prepared to move away from windows," Schneider said. Listen for weather warnings and go into a basement, if possible, and get underneath a study object like a table, he said, if a tornado warning is issued. "You want to know where your family's at so everyone can get to safety successfully."

Last year, a derecho caused at least $1 billion in damage from Chicago to Washington, killing 13 people and leaving more than 4 million people without power, according to the weather service. Winds reached nearly 100 mph in some places and in addition to the 13 people who died from downed trees, an additional 34 people died from the heat wave that followed in areas without power.

Derechoes, with winds of at least 58 mph, occur about once a year in the Midwest. Rarer than tornadoes but with weaker winds, derechoes produce damage over a much wider area.

Wednesday's storm probably won't be as powerful as 2012's historic one, but it is expected to cause widespread problems, said Bill Bunting, operations chief at the National Weather Service's Storm Prediction Center in Norman, Okla.

The storms will move so fast that "by the time you see the dark sky and distant thunder you may have only minutes to get to safe shelter," Bunting said.

For Washington, Philadelphia and parts of the Mid-Atlantic the big storm risk continues and even increases a bit Thursday, according to the weather service.

The term derecho was coined in 1888, said Ken Pryor, a research meteorologist at the Center for Satellite Applications and Research at the National Oceanic and Atmospheric Administration in College Park, Md. The word is Spanish for "straight ahead" or "direct," Pryor said.

The structure of a derecho-producing storm looks distinctive in radar and satellite imagery, Pryor said. "The systems are very large and have signatures that are very extreme," he said. "You get large areas of very cold cloud tops that you typically wouldn't see with an ordinary thunderstorm complex. The storms take on a comma or a bow shape that's very distinctive."


© Copyright 2014 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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