This is what happened when Tropical Storm Allison hit Houston area 19 years ago

HOUSTON – Nineteen years ago, Tropical Storm Allison made landfall and left Houston underwater. Allison delivered the most devastating rain Houston had ever seen.

Tropical Storm Allison started as a disturbance in the Gulf of Mexico in June 2001. No one expected it would end up going on record as one of the most devastating rain events in U.S. history.

In just days, the storm dumped 80% of the area's average rainfall.

Two million people were affected. Most of the deaths occurred from people walking or drowning in high water.

The National Weather Service issued a Flash Flood Warning three hours before the first fatality, and five hours before the first drowning.

When Allison was finally finished, 41 people were killed across the country, 95,000 cars were flooded and 73,000 homes were damaged. More than 30,000 people were left stranded in shelters and $5 billion in damage was done to property. Greens Bayou saw 27 inches of rain and other places experienced even more flooding.

The storm also destroyed 25 years of research at the Texas Medical Center.

Locally, 18 people drowned and three people were electrocuted. Death and destruction were everywhere.

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