Multiple tornadoes cause damage in wright and franklin counties local news difference between indigestion and heartburn

The timing of thunderstorms across eastern Iowa will be from around 2 p.m. to 7 p.m., and the highest risk of severe weather is roughly east of Highway 218/Interstate 380. The main threat is from strong and damaging winds as the storms race to the east. There is also a chance of tornadoes where the wind at the ground blows from the southeast. The most likely area of this happening is from about Interstate 80 to Highway 20. Large hail may also fall from the strongest storms area-wide, although this is not our main concern.

Even if the tornado threat does not come together, the strongest storms will still have the potential to create winds greater than 70 mph, which is enough to cause damage. This happened a few Sundays ago, when numerous trees and branches were knocked down and power outages occurred.

Meteorologists were even warning about the possibility of a weather event called a derecho (duh-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.

For the first time this year, the center was using its highest alert level for parts of Iowa, Illinois, Indiana and Ohio. The storms will start in late afternoon in eastern Iowa, Schneider said, and could hit Chicago around rush hour. Wednesday night’s White Sox game against the Toronto Blue Jays was postponed in anticipation of bad weather.

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.

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.