2017 Hurricane Season Was the Most Expensive in U.S. History

A series of major storms, including Harvey, Maria, and Irma, have caused unprecedented amounts of damage.

The Houston sky looks ominous after Hurricane Harvey on August 29.

An explosive September brought a spectacular end to an unusual streak of good luck that had kept major hurricanes away from U.S. shores for more than a decade, and the 2017 Atlantic hurricane season will now go down as the most expensive on record.

Two major hurricanes—Harvey and Irma—blasted the U.S. coast with winds exceeding 130 miles per hour (mph), and savage Hurricane Maria rocked Puerto Rico with winds exceeding 155 mph.

Totals are still being calculated, but early tabulations indicate that the U.S. suffered more than $200 billion worth of damage from 17 named storms during the season, which began June 1 and ends Thursday, November 30. That easily eclipses the previous record of about $159 billion, set during the summer of 2005, when Hurricane Katrina inflicted massive devastation on New Orleans. A record 28 named storms formed that year.

Most of this summer’s damage was caused by the infamous trio of Harvey, Irma, and Maria. Besides its winds, Harvey flooded Houston with more than four feet of rainfall as it made landfall August 25. Irma battered the Caribbean before coming ashore in the Florida Keys on September 10. And Maria destroyed homes and much of the infrastructure in Puerto Rico and inflicted a devastating disaster on the island when it came ashore on September 20.

Hurricanes 101

Some estimates put Hurricane Harvey’s damage as high as $180 billion. The Bloomberg Business website recently reported more conservative estimates, pegging the combined total from Harvey, Irma, and Maria at about $202.6 billion.

In contrast, the infamous Hurricane Andrew that ravaged Florida in 1992 cost about $15.5 billion. The great Galveston hurricane of 1900 caused $20 million in damage (in 1900 dollars). Adjusted for inflation that's about $605 million in 2016 dollars. That's a sum that would likely be vastly higher today given the relatively higher costs of modern development.

Source of Powerful Winds

A report on the 2017 hurricane season released Thursday by Colorado State University’s Tropical Meteorology Project notes several reasons why the 2017 season produced off-the-scale damages.

Unusually warm water in the area where hurricanes form in the Atlantic Ocean fueled the powerful storms, which formed when the peak of the season arrived in late August. Tropical storm activity had been about average until then.

Hurricanes draw their energy from seawater that has been heated to at least 80 degrees Fahrenheit. Early indications were that cooler temperatures would lead to a relatively quiet summer, but by late August the water had become unusually warm, despite the early season indicators, and that fueled the September eruption of hurricanes.

Grassland birds of the Great Plains wade by the water's edge as a storm begins to take shape in the background.
A landspout tornado grinds across a farm field. Though they can cause damage, typically landspout tornadoes – or narrow, rope-like condensation funnels that form underneath a growing cumulus cloud – are weak in strength.
A lone lightning bolt strikes the ground beneath an isolated supercell thunderstorm at sunset. Supercell thunderstorms are one of two types of thunderstorms that produce tornadoes. They’re the most common and the most dangerous.
An angry sky screams with rage as a storm begins in the depth of the night. With about 1,000 tornadoes per year, the United States is a major hotspot for thunderstorms and resulting twisters.
Nebraska, Kansas, Oklahoma, Northern Texas, eastern Colorado and eastern South Dakota comprise “Tornado Alley,” home to some of the world’s most powerful and destructive storms.
Concurrent landspout tornadoes swirl side-by-side across cropland. Landspout tornadoes are a type of non-supercell thunderstorm that are typically weak and are less likely to cause damage.
Lightning flickers across the dismal, gray sky as rain clouds roll in. In order for thunderstorms to form, there needs to be warm moisture near the earth’s surface and cool, dry air above.
Scientists predict that climate change will intensify the severity of storms.
A heavy thunderstorm hits the Flint Hills in Strong City, Kansas. Kansas is one of several states that makes up the U.S.’s "Tornado Valley."
A faint trail of lighting cuts its way through evening clouds over a hilltop in Wyoming's Red Desert.
Streaks of lightning trace their way across the night sky.
A collection of lightning bolts flashes through a purple sky in the Sand Hills of Ogallala, Nebraska.
An F4 category tornado races toward a storm chaser’s van. The F (Fujita) scale was used to measure wind speeds based on damage left behind after a tornado. F4 tornadoes, capable of causing devastating damage, can have wind speeds from 207 mph to 260 mph.
A supercell thunderstorm takes over the landscape in South Dakota, producing cloud-to-ground bolts of lighting as it stretches across the twilight sky. Supercell thunderstorms are dangerous storms characterized by strong winds, hail and tornadoes.
Silent but steady, single bolt of lightning bursts through a golden sky.
Low-hanging rain clouds form a over a river in Western Australia.
A rare mother ship cloud formation moves across the Texas Panhandle.
Lightning juts out from a thick cloud as rain begins to fall in the background.
A couple of farmers pause from their work as they survey the looming threat from growing storm clouds in the Sand Hills of Ogallala, Nebraska, in 2003.
Tap images for captions

Asked why seawater temperatures didn’t follow the usual pattern this year, CSU meteorologist Phil Klotzbach said, “I don’t have a great answer for that as of yet.” He said atmospheric and ocean conditions elsewhere may have influenced the unusual conditions in the Atlantic.

Upper-level winds—known as wind shear—that can disrupt and weaken Atlantic hurricanes were low during the summer. This allowed the trio of expensive hurricanes to form, as well as a fourth, Hurricane Jose, whose 155-mph winds stayed offshore as it moved northward roughly parallel to the U.S. Atlantic coast.

Weather systems and steering currents that had fortuitously aligned to steer hurricanes away from U.S. shores since 2005 were not in place this year. This meant that hurricanes traveled farther west, and thus made U.S. landfalls, instead of turning harmlessly out to sea.

Eye on the Future

Scientists are wondering whether the summer of 2017 may carry some warning signals for future hurricane seasons. “It was indeed a remarkable season,” said meteorologist Kerry Emanuel of the Massachusetts Institute of Technology. But Emanuel noted that “it is hard to tease out a climate signal with statistical confidence” from the carnage of the 2017 season.

Still, in a recent article published in the Proceedings of the National Academy of Sciences, Emanuel said human-influenced climate change “is expected to lead to a greater incidence of high-intensity hurricanes” which, combined with rising sea level, will increase flooding from hurricane-driven storm surges. Hurricanes also could produce “substantially more” rainfall as the atmosphere and oceans become warmer, he said.

Meteorologist Jeff Masters of Weather Underground said 2017 could be a harbinger of seasons to come.

The brutal 2017 season was an awful reminder of the huge hurricane vulnerability problem we face, and how unprepared we are for a potential future where the strongest storms get stronger and push their storm surges inland on top of steadily rising sea level,” Masters said.

Listen to IPPY Award-winning author Willie Drye talk about his latest book, For Sale—American Paradise: How Our Nation Was Sold an Impossible Dream in Florida, on NPR affiliates WUNC, Chapel Hill and WLRN , Miami. Visit his blog, Drye Goods, now in its 10th year. Follow him on Facebook . 


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