Todd Gross sounds the alarm
A warning about future flooding can sound distant until familiar city names enter the conversation. Meteorologist Todd Gross says several U.S. communities could face serious trouble as sea levels rise and climate-related flood risks grow.
Gross pointed to places including New Orleans, Miami, Galveston, Atlantic City, and parts of New York City. His warning comes as a new United Nations Environment Programme report examines the growing risks associated with exceeding 1.5°C of global warming.
Todd Gross puts New Orleans first
Meteorologist Todd Gross says New Orleans stands out as the biggest concern on his list. The city already depends on levees, floodwalls, pumps, and drainage systems to manage water in a low-lying coastal setting.
Gross argued that future sea level rise could force difficult choices about how New Orleans adapts. His comments reflect his own assessment, not an official government projection that New Orleans will need to relocate.
Todd Gross turns attention to Miami
Meteorologist Todd Gross also singled out Miami, where rising seas and tidal flooding are already major planning concerns. South Florida faces additional challenges because water can move through its porous limestone.
Gross speculated that relocation could eventually become part of Miami’s debate, although city officials currently focus on flood prevention, resilience projects, and adaptation to sea level rise. Scientists and local officials, however, use detailed projections and engineering studies to assess risks, costs, and possible responses over the coming decades.
Why the 1.5°C mark matters
The broader warning comes as climate researchers assess a future in which the multi-decadal average global temperature exceeds the Paris Agreement’s 1.5°C threshold, only to decline again potentially. A 2026 United Nations report says overshoot is widely assessed as unavoidable.
That does not mean climate action has been abandoned. The report calls for faster emissions cuts, stronger adaptation, and efforts to keep any period above 1.5°C as short and limited as possible.
Fun fact: UNEP’s 2025 assessment said every fraction of a degree of warming avoided can reduce losses, costs, and risks to people and ecosystems.
Galveston faces its own challenge
Galveston, Texas, is another city Gross placed on his list. Its location on a barrier island along the Gulf Coast makes flooding, storm surge, and sea level rise important issues for local planners.
The city has a long history of preparing for coastal hazards. Future risk will depend on several factors, including how much sea levels rise, how storms change, and what protective projects are built.
Fun fact: U.S. sea-level projections released in 2022 extend through 2150, providing coastal communities with long-range planning scenarios.
Atlantic City joins the warning list
Atlantic City, New Jersey, also appeared in Gross’s warning. Like many Atlantic Coast communities, it faces risks from sea level rise, high-tide flooding, and storm surge.
Those risks do not mean the city is certain to be overwhelmed. Coastal flooding varies by storm, tide, location, and protection measures. Long-term planning can reduce exposure and help communities prepare for changing conditions.
Charleston faces a different threat
Gross also mentioned Charleston, West Virginia, although the cited report did not explain why he included the inland city alongside coastal locations. Charleston’s flood exposure differs because river flooding and heavy rainfall matter more there than ocean-driven sea-level rise.
That distinction matters because climate hazards are not identical everywhere. A city can face serious flood concerns without being coastal, especially when heavy rain overwhelms rivers, streams, or drainage systems.
New York is already building defenses
Lower Manhattan received different attention in Gross’s comments. He warned about future storm-surge flooding but also pointed to New York City’s substantial investment in coastal protection.
The city is rebuilding and elevating waterfront areas, including the $200 million Battery Coastal Resilience project. These projects are designed to reduce flood risk from storms and rising seas while keeping Lower Manhattan usable for residents, workers, local businesses, and visitors.
What climate adaptation looks like
New York’s response shows what adaptation can look like before the worst impacts arrive. Floodwalls, raised shorelines, improved drainage, and redesigned public spaces can lower risk without requiring an entire neighborhood to move.
No project can erase every danger, and future conditions remain uncertain. Still, planning can buy time, protect infrastructure, and reduce damage when coastal storms or unusually high water reach vulnerable areas.
High tides can become bigger problems
One reason the warning matters is that sea level rise can make ordinary high tides more disruptive. NOAA says annual high tide flooding has increased fivefold to tenfold since the 1960s in several U.S. coastal cities.
Rising baseline sea levels can allow storm surge to produce flooding at higher elevations and more frequently. A storm does not need to be historically extreme to cause problems where streets, homes, or infrastructure sit close to the water.
Heavy rain raises inland risks too
Heavy rain adds another layer of risk beyond the shoreline. Federal climate data show heavy precipitation events have become more common across much of the contiguous United States, especially in the Northeast and Midwest.
Cities can struggle when heavy rain falls faster than drains, streams, and sewer systems can handle it. Pavement limits how much water can soak into the ground, increasing runoff and flooding.
Ice age comparison needs context
The comparison with past ice ages needs context. Gross noted that relatively small changes in global average temperature can create enormous differences in Earth’s climate, which is broadly true.
However, warming today and the cooling that produced past ice ages happened under different conditions and timescales. The useful comparison is that relatively small changes in Earth’s global average temperature can correspond with major changes in ice cover, sea level, ecosystems, and regional climate.
For another weather update tied to shifting temperatures, seasonal patterns, and changing forecasts, see why September weather is taking an unexpected turn across the U.S.
Preparation matters more than panic
The warning is serious, but it is not a countdown saying these cities will suddenly disappear. Climate risk develops differently by place, and future outcomes depend on emissions, local geography, infrastructure, and adaptation.
For residents, the useful response is attention, not panic. Flood maps, evacuation plans, drainage upgrades, coastal defenses, and informed development choices can help communities prepare for hazards becoming harder to ignore.
Are U.S. cities doing enough now to prepare for growing flood and climate risks? Share your thoughts and drop a comment.
