Hurricane Season Getting Going Across the Northern Hemisphere: AI Models Discussion 6-4-2026

The Northern Hemisphere tropical cyclone season is swinging into gear, with an expectation that it will be a busy year in the Pacific specifically, thanks to a robust developing El Niño event. We’ll go around the globe and look at AI forecasts of activity in the various basins.

West Pacific

With Typhoon Jangmi dissipating, there are currently no active cyclones in the West Pacific. Invest 91W is near Taiwan, though, and has a chance to develop and intensify a little bit as it moves NE towards Japan (Figure 1). It likely won’t have much time to intensify significantly before being absorbed in the mid-latitude flow.

In the medium-range, models are starting to hint at the potential for another Typhoon to develop in the Central Pacific (Figure 1). The 1000-member Google Deepmind ensemble shows a fairly significant chance of development into a strong typhoon, though most members don’t show a TC forming for about 10 days (Figure 2), based on the graphics from Michael Fischer’s awesome TC-ATLAS webpage. This will be another good test of the long-range TC genesis skill from this model.

Dynamically, TC genesis will be favored in this region thanks to another significant Westerly Wind burst (WWB) over the Pacific (Figure 3), as the MJO circulation interacts with the blossoming El Niño.

We will likely see quite a few TC genesis attempts in this part of the West Pacific this season, similar to 1997 (another famous El Niño year), which had a large number of Super Typhoons form in the general vicinity of the Mariana Islands (Figure 4).

East Pacific

Moving a little East, the East Pacific is also active. TS Amanda formed, but is facing a marginal environment, and will likely weaken and fall apart fairly soon (Figure 5).

Further East near Mexico, there are a couple more areas that bear watching, as models show potential development of a “Central American Gyre”, a broad area of vorticity, moisture, and low pressure that often forms near Mexico, Central America, and the Northwest Caribbean and is sometimes associated with TC development from smaller vortices within the broader background flow. In this case, models are showing two areas that could form on the East Pacific side of Central America (Figure 6), and could be a threat to Mexico, Guatemala, El Salvador, and nearby regions.

Atlantic

As Figure 5 shows, development from the Central American gyre may not be limited to the Pacific side. In the medium range, some models are hinting that low pressure could develop in the Gulf. This could come from one of the Pacific storms crossing into the Gulf, or from the gyre itself lifting north. I wouldn’t expect a strong tropical cyclone due to strong upper level winds (Figure 7) that are common both at this time of year and during El Niño years, but we could have a slight chance for the first named storm of the Atlantic season.

It certainly looks like it will be a busy few weeks in the tropics, so we will be back with more updates soon!