Moody's maps El Niño's split perils as Atlantic stays quiet and Pacific loads

A new analysis from Moody's argues that the eight named storms and zero hurricanes recorded in the North Atlantic by early October say little about what the season will cost, because the 2026 El Niño is suppressing some catastrophe perils while amplifying others across the map.

The event itself is the outlier: NOAA confirmed El Niño conditions in the Pacific on June 11, and by early September forecasters cited by Moody's were tracking it as potentially the fastest-developing on record—a pace NOAA and the World Meteorological Organization have both called unusually fast—while NOAA's July update assigned an 81% probability to a very strong peak from October through December, a strength that would rank the event among the most intense since records began in 1950.

El Niño's usual mechanism is wind shear, and the Atlantic has complied; forecasters expect that suppression to hold through the end of the season.

Losses do not follow the count: Hurricane Ida produced insured losses above $30 billion in 2021, and Hurricane Ian generated more than $53 billion in 2022, a year of otherwise average Atlantic activity, according to Moody's RMS event response data. A single landfalling storm can reset the year, and the aggregate tally says relatively little about how it ends.

That asymmetry bites harder now, with Atlantic sea surface temperatures unusually warm: a low-activity season has barely cooled the water, and any storm that forms meets conditions favorable to rapid intensification, which NOAA's National Hurricane Center defines as a maximum sustained wind increase of at least 35 miles per hour within 24 hours.

The Eastern and Central North Pacific has already supplied the counterexample: ten hurricanes and 20 named storms, three of them Category 5, with Hurricanes Lala and Lowell striking Hawaii and bringing wind, storm surge and rainfall flooding across the islands. For US Pacific territories and Pacific Rim assets, the analysis draws a seasonal picture markedly different from the Atlantic's.

Moody's then turns to Australia, which it treats as a case of its own, describing a continent in its wettest El Niño conditions; the published excerpt stops there mid-sentence, so the specific Australian peril the analysis goes on to describe is not in the material available. The article's framing points to bushfire, Pacific and Asian risks all shifting, but the detail behind that does not appear in the extract.

For insurance-linked securities, the analysis is useful as geography: cat bonds and parametric covers pay against named perils in named regions and against triggers defined in advance, and a year that suppresses one basin while loading another separates the quiet part of a portfolio from the live part. The Atlantic share of an ILS book, on the season so far, is the portion most likely to finish unused.

Trigger design is where that shows up: Mexico's cat bond demonstrated the mechanism in September, when the Polo system's 892-millibar reading cleared the bond's pressure test before the storm's coastal track had decided whether $175 million would move from ILS investors to Mexico's treasury. This season's Pacific activity runs more systems through the same test.

The capital backdrop sharpens the point: record capital has made the top of the reinsurance tower cheap, and eight named storms with no hurricanes will be read into January as evidence that wind capacity can stay abundant. The Moody's map cuts the other way, though, because the loss that resets the year is likelier to arrive from a basin where the industry has written and modeled less recently, and the same warm Atlantic water that suppressed activity raises the intensity of whatever does form.

January is where the map becomes terms. This publication has argued that the strongest El Niño on record arrives as a terms problem, not a capacity problem, with Atlantic wind capital still ample and the argument moving to sublimits; a $1.3 trillion surplus behind the market turns renewals into a test of discipline, and the Moody's analysis shows why that test is harder than a quiet Atlantic makes it look. The peril has moved rather than retired, and capital comfortable writing Atlantic wind is not automatically comfortable writing the Pacific.

NOAA's 81% probability runs through December, placing the Pacific's peak alongside the January renewal conversation rather than safely behind it, and the Atlantic will close with zero hurricanes on the board.