Allison is one of the poster children that illustrate water is the deadliest weapon a tropical storm or hurricane has. This ...

Authorities are still assessing the deadly effects of heavy rains that caused devastating flash floods in Texas Hill Country, ...

Flooding has caused an average of more than 125 deaths per year in the United States over the past few decades, according to ...

PHOTOS: Remembering Tropical Storm Allison. FILE - Onlookers stand on an overpass where flood waters have covered Interstate 10 in Houston, Saturday, June 9, 2001. AP Photo/Eric Gay.

O n this day in 2001, Tropical Storm Allison made landfall near Freeport, Texas, becoming one of the most destructive tropical storms in U.S. history despite never reaching hurricane strength.

During Allison's dozen days as a tropical storm, meteorologists estimate it dumped 32 trillion gallons across Texas and other states. That's enough water to fill Galveston Bay 45 times.

Path of Tropical Storm Allison (National Weather Service). The storm actually began as a tropical wave off Africa on May 21, 2001. Within five days, it had traveled west and over northern South ...

Weather officials admitted Thursday that Tropical Storm Allison, despite the flooding it spurred across the Houston area, may not have been a tropical storm after all. What's clear is that, with a ...

Tropical Storm Allison (2001) essentially drowned the Houston metropolitan area and is the deadliest U.S. tropical storm. It killed 41 people across six states; ...