The 2001 Hurricane Season had barely been proclaimed on June 1, when Tropical Storm Allison formed in the western Gulf of Mexico.

Remnants of Tropical Storm Allison - June 11, 2001 . Allison then acquired subtropical characteristics and continued to produce heavy While Allison was never strong enough to reach hurricane status and weakened to below tropical storm strength early in its life, the low pressure center remained after Allison impacted residents from … The formation of Tropical Storm Allison can be traced back to a tropical wave.

Tropical Storm Allison developed over the north western Gulf of Mexico and moved inland over the upper Texas coast, producing extremely heavy rainfall and catastrophic floods in the Houston area. The Tropical Prediction Center began to track the wave on May 21st after it moved off the west coast of Africa.