Atlanta, GA

The September 2009 Atlanta flooding produced more than $500 million in losses across the metro and demonstrated what intense rainfall events do in a city where decades of development have replaced natural drainage surfaces with parking lots and rooftops. Atlanta's flood score of 51 sits at the 59th national percentile—moderate—but the 2009 event was not moderate in the affected neighborhoods. Heat at the 78th national percentile is the city's top-ranked hazard: the extended 2023 Southeast heat season drove cooling costs and urban-heat-island concerns in a metro where the Buckhead and Midtown tree canopy diverges sharply from lower-canopy districts. What we noticed: tree canopy coverage is one of the more consequential variables in Atlanta's risk profile. Buckhead's 30305 extensive tree cover helps heat exposure and is simultaneously a wind-damage liability after storms that take significant limbs and crowns down. Midtown's dense infill in 30309 affects both runoff and heat-island intensity. West Paces area properties in 30327 sit near creek and slope drainage systems that produce localized flooding in a surprising number of luxury properties—a condition that premium pricing does not resolve. Annual premiums range from $1,400 to $3,200—stable—with creek corridors and basement moisture issues deserving more buyer attention than most receive. Flood insurance is not broadly required but merits evaluation for creek-adjacent properties based on the 2009 precedent. Wildfire at the 24th national percentile is minimal. The Atlanta risk case is about urban infrastructure, tree management, and the compounding effect of heat on a city with significant cooling-infrastructure inequality across neighborhoods. Creek flooding is the event risk; heat is the chronic operating cost.

— Open Data Collective