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Allison - 2001

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Tropical Storm Allison After Landfall

A tropical wave moved off the coast of Africa on May 21, the wave tracked west and emerged in the Caribbean Sea after moving into northern South America. This wave was eventually deemed strong and organized enough to become Tropical Storm Allison on June 5 about 120 miles south of Galveston, Texas. As Allison moved north, it quickly strengthened to 55 mph winds, and a pressure of 1002 mbar. The strengthening came to a halt as Allison moved inland near the Houston, Texas metropolitan area. After landfall, the storm slowly continued inland, and became stationary in eastern Texas near Lufkin on June 7.

The storm began to sag southward on June 8, and this led to a reemergence into the Gulf of Mexico late on June 9, at the same approximate location at which it made landfall. Although over warm waters once again, dry air that had entered the circulation prevented any immediate re-development. Allison became a subtropical depression at this time, having lost tropical characteristics. The depression developed a new center as it moved inland near Morgan City, Louisiana early on June 11. Strong thunderstorms began to organize at this point, and Subtropical Depression Allison became Subtropical Storm Allison that day. The bands of convection began to spiral and organize on June 11, creating an eyelike feature as the storm was over land. The subtropical storm continued to track to the ENE, and weakened back to a Subtropical Depression early on June 12 over Alabama. The depression continued ENE and became stationary near Wilmington, NC on June 14, when the center began to drift northward before regaining the ENE motion on June 16, and reached the open Atlantic on June 17. Allison briefly re-strengthened to a Subtropical Storm over the open waters, but was absorbed by a cold front on June 18, and dissipated on June 19 southeast of Nova Scotia.

The relentless heavy rains in the Houston area of Texas caused massive and catastrophic flooding. Damages were reported at over 1.2 Billion dollars, and a final loss total at about 2.4 Billion, but other agencies such as FEMA report damages at near 5 Billion dollars. A total of 48,000 homes received at least minor damage, 14,000 of those homes were either completely destroyed or received major damage. A total of 41 deaths were reported, all from the massive flooding, and high surf generated by the storm. Due to the devastation caused by the storm, the name Allison was retired in the spring of 2002 and will be replaced with Andrea when the list is used again in 2007.