Millions of Americans are being urged to prepare for severe thunderstorms, flash flooding, and damaging winds across more than a dozen states through the Fourth of July weekend. The storm threat is developing as a heat dome that has impacted the central and eastern U.S. for over a week begins to weaken.
The affected states include Colorado, Wyoming, Nebraska, South Dakota, Iowa, Kansas, Missouri, Oklahoma, Texas, Arkansas, Pennsylvania, New Jersey, New York, Vermont, and New Hampshire. Some of the most intense storms could produce wind gusts up to 85 mph, comparable to a Category 1 hurricane, along with torrential rain and frequent lightning. Forecasters warn these conditions could create life-threatening situations, especially in areas prone to flash flooding.
The transition from extreme heat to severe weather is expected to bring significant rainfall. AccuWeather Senior Meteorologist Brett Anderson noted that the atmosphere is "loaded with moisture" that will be released as the heat dome collapses and cooler air moves in. Already, some areas have experienced heavy downpours, with over nine inches of rain reported in 24 hours northwest of Des Moines, Iowa, and around four inches west of Chicago.
Forecasters anticipate a broad area from the Midwest to the Northeast, particularly along the Interstate 80 and Interstate 90 corridors, could receive one to four inches of rain. In some locations, this rainfall could reach up to six inches, with much of it potentially falling within a few hours, increasing the risk of flash flooding. Meteorologists advise campers to avoid low-lying areas and small streams due to rapidly rising water levels and urge drivers not to cross flooded roads.
The severe weather is expected to disrupt holiday travel and outdoor celebrations. Fireworks displays in some major cities could be impacted by rain, low clouds, fog, and the threat of lightning. The risk of severe weather is present from northern Mississippi and Alabama to New York, Vermont, and New Hampshire through Friday night. A particularly active zone is anticipated from central Nebraska and southeastern South Dakota into central Iowa and northwestern Missouri, with another area of concern in southern Michigan.
By Saturday, the severe thunderstorm forecast extends along an approximately 1,800-mile stretch from Colorado and Wyoming to the Mid-Atlantic coast and southeastern New England. Heavily populated areas along the Interstate 95 corridor, including New York City, Philadelphia, Baltimore, and Washington D.C., could be affected. The storms are expected to develop Saturday afternoon and evening, potentially interfering with holiday festivities.
The pattern is projected to continue into Sunday and Monday. Sunday's storms are forecast from Missouri and Arkansas eastward to Pennsylvania and New Jersey, with another potential outbreak across parts of Colorado, New Mexico, Wyoming, Nebraska, Kansas, Oklahoma, and Texas. By Monday, additional severe storms could emerge from near Pittsburgh to Virginia Beach, Virginia, and Greenville, North Carolina.
Millions of Americans may face a prolonged period of dangerous storms, bringing flooding and destructive winds during a busy holiday travel weekend.