Over 28 inches of rain fell just northeast of downtown Houston in a 12-hour span, far surpassing the nearly 21 inches of rain that fell over 12 hours during Harvey.
[Ads /]
Allison's rains were more localized, unlike Harvey, which dropped nearly three feet of rain across all of Harris County over a four-day span.
[Ads /]
Tropical Storm Allison claimed 23 lives and caused $5 billion in damage. Allison is the only tropical storm to ever have its name retired.