The storms could significantly impact outdoor events, including Memorial Day ceremonies, parades, and recreational activities. Travelers in regions from Texas to New England should prepare for potential delays due to heavy rain and lightning. Rainfall totals of one to four inches are expected in many areas, with localized amounts exceeding six inches, increasing the risk of flash flooding. Beachgoers in the Northeast may also face cooler temperatures, 30 to 50 degrees lower than recent highs, limiting outdoor enjoyment.