Key facts
- Tropical Storm Allison formed 25 years ago.
- The storm caused an estimated $5 billion in damages.
- It resulted in widespread flooding.
- Tens of thousands of people were affected.
Twenty-five years ago, Tropical Storm Allison formed in the Gulf of Mexico. Over the subsequent days, the storm unleashed torrential rains, leading to widespread flooding that impacted tens of thousands of people. The event is remembered as a costly disaster, with estimated damages reaching $5 billion. The storm's impact was particularly severe in the Houston area.