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Think 2004 or 2005-level bad. This has a few potential impacts:
1) The devastation in Florida in the waning months of WWI (with a *Katrina hitting Miami and New Orleans in August 1919) probably comes too late to allow for a Central Powers victory, but the amount of effort the US must deploy in rebuilding the Southeast might allow them to make out a bit better. Maybe Austria keeps Burgenland or Hungary keeps more of Slovakia?