A persistent pattern of slow-moving thunderstorms will track across the central and eastern United States through the end of the week, bringing the potential for heavy rainfall, travel disruptions, and localized flash flooding.
According to AccuWeather meteorologists, a slow-moving weather front stretching across the Plains and Midwest will trigger repeated rounds of showers and thunderstorms that move along the same path from southwest to northeast. This setup, often referred to as “training,” can drop several inches of rain over the same locations within a short time frame.
The immediate area of concern through Thursday includes parts of the Plains and Midwest, extending into major metro areas such as Chicago.
Severe thunderstorms are also possible, particularly Wednesday afternoon and night, along a corridor stretching from the Texas and Oklahoma panhandles into west-central Illinois. Downpours are projected to persist across the central Plains, Mississippi Valley, and Ohio Valley heading into the weekend.
At the same time, atmospheric moisture is building across the East. A combination of high pressure over the Atlantic, an eastward-crawling front from the Mississippi Valley, and a jet stream disturbance parked over the Southeast will draw moisture northward from Florida and the Gulf Coast through the Appalachians and up the Eastern Seaboard.
AccuWeather senior meteorologist Alex Sosnowski noted that the busy weather pattern will drench large portions of the region, warning that “some communities could receive a couple of inches of rain in just a few hours, raising the risk of flash flooding.”
Temperatures and humidity are expected to climb alongside the rain chances. Locations that see prolonged periods of sunshine during the second half of the week will reach highs in the mid-80s to mid-90s Fahrenheit.
Combined with elevated humidity, AccuWeather RealFeel® Temperatures could near 100 degrees in some locations. Conversely, regions experiencing continuous cloud cover and frequent rainfall are expected to hold in the upper 70s to mid-80s.
Storm development in the East is anticipated to concentrate in a south-to-north corridor along the perimeter of the offshore high-pressure system. While most activity will peak during the afternoon and early evening hours, rainfall could occur at any time, potentially impacting both morning and evening commutes. Some localized storms may also produce gusty winds capable of bringing down tree branches and causing power outages.
AccuWeather’s Geoff Cornish indicated that the setups over the mid-Atlantic and Southeast from mid- to late week carry a distinct danger of localized flash flooding, particularly where drainage systems become overwhelmed or small streams rise rapidly.
Long-range forecasters are also keeping an eye on the Atlantic and northern Caribbean. Similar atmospheric configurations have historically permitted weak tropical systems to drift toward the Southeast.
AccuWeather hurricane experts are currently monitoring the region for potential tropical development between Aug. 9 and Aug. 15. Although such systems typically feature lower wind speeds, they carry the capacity to produce extreme rainfall amounts and escalate the overall flood threat.
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