29/10/2025
On This Day in Hurricane History: Superstorm Sandy, October 29th 2012.
Hurricane/Superstorm Sandy was an event unlike anything we've seen in quite a long time. A perfect combination of a winter storm and a hurricane, Sandy turned out to be one of the most costly, deadly, and devastating storms to ever hit the Northeast US.
Born off a tropical wave originating from Africa weeks earlier, Sandy was named south of Jamaica on October 22nd. Sandy was the 18th named storm, 10th hurricane, and 2nd major hurricane of a very active 2012 season. Sandy would turn northward in response to a large upper trough, striking Jamaica as a category one storm, then re-intensified rapidly to a category three before landfalling in Cuba with 135mph winds. As Sandy moved further northward, her slow transition into a "hybrid storm" began due to interaction with the Jet Stream to her west. Despite strong wind shear and cooler air trying to wrap in, Sandy maintained a warm core, keeping her a hurricane as the system tracked northward paralleling the Florida coast. Several days before landfall, most computer models turned the system out to sea, as virtually all storms in her position do. However the pattern was complex, and the European model (ECMWF) correctly predicted an unusual turn west, slamming the now gigantic storm right into New England.
As it turned out, the ECMWF was right. Sand would re-intensify over the Gulf Stream as it continued to both feed off the clashing of cold air, warm tropical air, and was vented by the jet stream aloft. Shortly before landfall on the 29th near Atlantic City, Sandy had become a monster hybrid of a Hurricane and Winter storm.
This means that Sandy technically made landfall as an "extra-tropical", or "post tropical" storm, rather than a classic hurricane. This made for a confusing and muddled message, since Hurricane Warnings weren't technically up for the storm, despite the conditions being no different. The handoff and handling of the event was heavily criticized, and highlighted a common issue of the field being too smart for it's own good.
Massive winds lashed up and down the coastline, sustained over 80mph off shore. Tropical storm force winds reached dozens of states. Water rise along the coast ran anywhere from 8-15 feet above normal. Rainfall totals of 8 inches or more flooded inland areas, while sea water flooded the coastline. Piers were ripped away, homes were destroyed, cities were evacuated. Over 6 million people were left without power in the storms wake.
In all, 233 people lost their lives during the storm, 157 in the US. This made Sandy the deadliest hurricane since Katrina in 2005. The total damage from Sandy was 68 Billion dollars in the US, the second costliest on record at the time. It has since been surpassed by several storms, sitting at 8th today.
Sandy was the second largest storm in Atlantic Basin History, by measuring her TS force wind field. The storm also set many pressure records, as well as surge and wave records along the coast. Due to the massive destruction, Sandy was retired, and will never be used for another Atlantic Hurricane again. She was replaced with "Sara." That name last appeared on 2024s list, and will appear again in 2030.
If anything good came out of this, Sandy did spur meteorological computer upgrades. The American GFS model did not forecast the storm well, while the ECMWF was right several days out. I think that was more luck than anything else, but billions of dollars were spent on massive computing upgrades stateside, to make our models better. It's interesting to wonder with the suites of models we have in 2025, if Sandy would have been as much of a surprise as it was then.