Heavy Rainfall Threatens Flash Flooding Across Eastern, Southern US

A widespread pattern of heavy rainfall and thunderstorms is impacting large parts of the United States and other regions, with significant flooding risks continuing through the week. South Carolina is experiencing ongoing showers and thunderstorms with potential for heavy rain and gusty winds through at least Tuesday, including marginal severe weather risks from isolated damaging wind gusts and hail. The Northeast, including parts of New York and New England, is under flood watch as nearly 4 million people face potential flash flooding, with storms stretching from New England to Texas. In the Southeast, Texas and Louisiana continue to deal with repeated heavy rainfall and flooding, with forecasts indicating the pattern will persist. Internationally, heavy rain warnings are issued in New Zealand's South and North Islands due to an advancing cold front, and several districts of Tamil Nadu, India, are under heavy rain alert amid the early southwest monsoon onset, with accompanying thunderstorms and gusty winds expected until mid-May. These diverse regions face persistent unsettled weather with potential for localized flooding, strong winds, and storm-related hazards.