A weather system is bringing widespread heavy rainfall and flash flood threats across multiple regions in the United States from Monday through Tuesday. Florida is expected to experience heavy rains, particularly in the lower peninsula and Southwest Florida, with a 'yellow' risk level for excessive rainfall continuing into Thursday as the system shifts toward the upper Gulf. The Mid-Atlantic region along the I-95 corridor faces numerous instances of flash flooding on Monday, with the Weather Prediction Center maintaining a 'Moderate' risk of excessive rainfall and flash flooding across parts of the Mid-Atlantic and Northeast. Considerable flash flooding is likely in these areas, with locally catastrophic flash flooding possible. Additionally, concerns about potential flooding have been raised for the New Orleans area as the weather pattern supports widespread heavy rain through midweek.