A flood watch has been issued for millions of people due to the possibility of heavy rain, with some areas potentially seeing up to 8 inches of rain. The threat of flooding appears to be widespread, affecting regions including the northeast, the south, the midwest, and california, although the specific areas and severity of the threat are not entirely clear. Various parts of the country are also experiencing or bracing for other severe weather conditions, including flash flooding, tornadoes, and severe thunderstorms.