![]() Damage to trees and power lines was so extensive in some communities that electricity was out for days. More than 20 people were killed and the high winds caused $2.9 billion in damage, knocking out power for 4.2 million customers. Ten years ago this month, a historic derecho raced from Chicago to the mid-Atlantic on June 30, 2012. Precautionary measures include bringing pets indoors and securing loose items in the yard such as trash cans, tents, trampolines and deck furniture. People should be prepared for the storms in advance, forecasters said. Storms tracking at this speed could allow just a few minutes for residents to take shelter after the first rumbles of thunder and flashes of lightning are observed. Once the thunderstorm complex develops, it could begin to move at a forward speed of 40-60 mph. Prior to daybreak Tuesday, the storms may roll through Pittsburgh before potentially reaching areas from Washington, to Norfolk, Va., during Tuesday morning and midday. "Of particular concern is if heavy rainfall persists over parts of Ohio, West Virginia, western Pennsylvania and surrounding areas, where the ground is already saturated from recent heavy rainfall." "This thunderstorm complex can produce heavy rainfall on the order of 2-3 inches in a short period of time, elevating the risk for rapidly rising water, including flooding of creeks and streams, as well as roadways," Porter said. In addition to powerful wind gusts, there is the risk of flash flooding, frequent lightning strikes, large hail and perhaps a couple of isolated tornadoes.Īnother risk not to be overlooked will be flash flooding. ![]() Ground stops are likely at area airports as the storms approach. ![]() Power outages, property damage and dangerous travel conditions are likely in the path of the storms. This means that many communities will be at risk for potentially dangerous thunderstorms. ![]() One or more lines of storms may extend all the way to the Chesapeake Bay region and perhaps into portions of the Carolinas during the day Tuesday. Regardless of an official designation of a derecho or not, severe thunderstorms are likely to occur along a swath of 700 miles from the Great Lakes region during late Monday and Monday night to portions of the central Appalachians early Tuesday. However, it is possible for the storm to turn toward cities such as Cincinnati on Monday night and perhaps Nashville and Charlotte, N.C., on Tuesday. severe thunderstorms are not expected to reach Boston and are unlikely to hit New York City and possibly avoid Philadelphia. In extreme cases, thunderstorms can turn so much that they end up traveling more to the south, rather than to the east. In situations such as this, the thunderstorm complex tends to travel in a slightly curved line that bends to the southeast. There is the potential for thunderstorms to organize into a large complex and then reach the threshold of a derecho, a high-powered severe weather event in which wind gusts reach or exceed 58 mph along an area of 240 miles or greater. CDT on Monday, a complex of heavy, gusty thunderstorms was organizing over Wisconsin, while locally severe thunderstorms were erupting farther south over Illinois and Indiana. On this radar snapshot captured at about 1 p.m. For example, AccuWeather RealFeel® Temperatures will be around 100 in lower Michigan, Ohio and parts of Indiana on Tuesday and Wednesday," Porter said. "This is especially concerning because some of the areas at greatest risk for damage from this thunderstorm cluster will be impacted by high temperatures in the coming days. Typically, severe thunderstorm wind damage tends to be much more localized to a part of a community, whereas this cluster of thunderstorms may create widespread damage over a much larger area and raises the risk for significant power outages, some of which could be long-lasting in the hardest-hit communities, according to Porter. One of the unique aspects of this type of severe thunderstorm complex is that the threat of wind damage is much more widespread than what typically occurs with most severe thunderstorms.
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