St. Louis got extremely lucky that night, and I think that gets overlooked. The metro area is sandwiched between the paths of the Defiance, MO EF3 to the west and the Edwardsville, IL EF3 to the east. If a tornado had occurred between those two, it very likely would have impacted or come very close to impacting areas hit by the 2011 Good Friday EF4. The NWS Office and radar site in Weldon Springs came very close to a direct hit by the Defiance tornado, which passed just to the south.
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An addition five significant tornadoes would occur in Illinois that night, which makes the northern portion of the outbreak impressive in and of itself, but of course it wasn't comparable to the unbelievable violence that occurred further south.