Tropics update, 23 June 2025

For those not obsessively watching for the next shoe to drop in the Middle East or Eastern Europe or any of the other hot spots, we have one tropical storm and two possible areas of development.

Starting in the West Pacific, Tropical Storm Sepat has developed southeast of Japan, and is expected to remain a relatively weak system as it tracks just offshore the main islands over the next few days. Sea surface temperatures are still pretty cool out there, and according to JTWC the overall environment is marginal.

Map showing the projected path and intensity of Tropical Storm Sepat near Japan, with estimated forecast intervals and impact markers.
click any image to embiggen.

In the East Pacific NHC has an area of thunderstorms off of Central America tagged at 70% chance of spinning up – this is the same area that has been spawning storms over the last few weeks. Most likely track is offshore, but worth checking in from day to day to (literally) see what develops.

Satellite image showing a designated area of thunderstorms off Central America with a 70% chance of tropical development, marked for the NHC Tropical Weather Outlook.

Finally, there is an area tagged as Invest AL90 in the central Atlantic. It is only of interests to fish, fish related interests, and those desperate for clicks as the Atlantic season has not had anything of interest as of yet. Here’s the obligatory spaghetti map, which if properly cooked turns into a gooey inedible mess, so nothing to worry about.

Map showcasing the projected track models for Invest area AL90 in the central Atlantic, with various colorful lines indicating potential paths of development.

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