A potent storm system is sweeping across the United States, bringing with it heavy rain and a significant threat of flash flooding. The National Weather Service has issued flash flood watches and warnings for millions of people across the country, with the worst of the weather expected to hit the Midwest and Eastern Seaboard. The storm system is fueled by a strong low-pressure system that is drawing moisture from the Gulf of Mexico, leading to heavy rain and thunderstorms. The rain is expected to be particularly heavy in areas such as Illinois, Indiana, and Ohio, where totals could reach up to 4 inches in some areas. The National Weather Service is warning of a high risk of flash flooding in these areas, with the potential for rapid rises in water levels and significant disruptions to daily life. In addition to the Midwest, the storm system is also expected to bring heavy rain to the Eastern Seaboard, with areas such as New York and Pennsylvania potentially seeing totals of up to 2 inches. The rain is expected to be accompanied by strong winds, with gusts of up to 50 mph possible in some areas. The National Weather Service is urging people to stay indoors and avoid travel unless absolutely necessary, as the heavy rain and flash flooding could make roads impassable. The storm system is also expected to bring a significant threat of tornadoes, with the Storm Prediction Center issuing a moderate risk of severe weather for areas such as Arkansas and Tennessee. The threat of flash flooding is particularly concerning, as it can be deadly and destructive. Flash flooding can occur with little to no warning, and can be exacerbated by urbanization and other human activities. The National Weather Service is working to provide timely and accurate warnings to those in the affected areas, but it is up to individuals to take the necessary precautions to stay safe. This includes staying informed about the latest weather forecast and warnings, and having a plan in place in case of an emergency. The storm system is expected to move slowly, with the heavy rain and flash flooding threat lingering into the weekend. As the storm system moves east, it is expected to bring heavy rain and flash flooding to areas such as West Virginia and Virginia. The National Weather Service is warning of a high risk of flash flooding in these areas, with the potential for significant disruptions to daily life. In preparation for the storm, residents are advised to stock up on emergency supplies, such as food, water, and batteries, and to have a plan in place in case of a power outage. The American Red Cross is also urging people to take precautions, such as staying indoors and avoiding travel, and to be prepared for the possibility of flash flooding. Overall, the storm system is a significant threat to millions of people across the United States, and it is essential that those in the affected areas take the necessary precautions to stay safe.