Hurricane season isn’t over. Here’s the latest threats forecasters are tracking.

Specialists at the National Hurricane Center are watching potential storms in both the Pacific Ocean and the Atlantic Ocean, which appears to be awakening from its unexpected, extended quiet period.

Forecasters are awaiting the expected formation of a tropical depression or tropical storm in the waters of the central tropical Atlantic between the Windward Islands and the African coast, the hurricane center said on Sept. 16. That storm, expected to form later on Sept. 16 or on Sept. 17, would be named Tropical Storm Gabrielle.

“It’s the peak of hurricane season but it’s been three weeks since we’ve had an active tropical cyclone in the Atlantic Basin,” said Robbie Berg, the center’s warning coordination meteorologist, in a video published Tuesday, Sept. 16. “That looks like it’s going to change,” he added.

In the Pacific, meteorologists are watching to see how much rain the degenerating Tropical Storm Mario could carry into the San Diego region. The hurricane center also is awaiting the forecast formation of another tropical storm further to the south.

Will Gabrielle form?

The system expected to become a tropical storm over the next day or so is “likely to pass northeast of the Lesser Antilles, then reach the western Atlantic sometime next week,” Berg said. “Plenty of time to watch this system for any potential impacts in the United States or offshore.”

On Sept. 16, the hurricane center put the chances of storm formation at 90% over 48 hours as the low pressure area moves to the west-northwest in the Atlantic. The storm’s eventual path may become more clear once it develops into an organized tropical depression or storm.

There’s also plenty of time to watch another wave off the western coast of Africa, said John Cangialosi, a senior hurricane specialist at the center. “This one has a low shot of development during the next week, but plenty of time to watch that one.”

That second area of disturbed weather behind it is listed at a 20% chance of development over the next seven days.

For now, it looks like neither of the storms expected in the Atlantic will affect land anytime soon, and both could eventually curve out over the open ocean before reaching the Caribbean, according to the array of computer models the center uses to forecast hurricane movement.

Alan Gerard, retired meteorologist and author of the Balanced Weather Substack, said Bermuda will “need to pay attention” to the storm expected to become Tropical Storm Gabrielle, and added it “looks unlikely to have any other land impacts, other than maybe some surf and rip currents if it becomes a significant hurricane.”

Mario’s remnants to bring rain to Southern California

Moisture from Mario is forecast to be picked up by another area of low pressure, then interact with high temperatures averaging 4 to 8 degrees above normal in Southern California and bring rain to the San Diego region, according to the National Weather Service in San Diego. Mario’s remnants will bring increasing chances for showers on Wednesday, Sept. 17 and into Thursday, Sept. 18.

The second potential storm south of Mexico and west of Central America could produce a tropical depression or storm by the weekend of Sept. 20, the hurricane center said. The second tropical system could also bring tropical moisture to the San Diego region, the weather service said.

A lull in hurricane season may come to an end

To date, the Atlantic hurricane season has seen its lowest storm activity since 2014, with only one hurricane so far, Hurricane Erin. That’s the fewest through Sept. 15 since 2002, said Michael Lowry, a hurricane specialist with WPLG Local10 in South Florida. But he pointed out the plentiful tropical activity in late September 2024 and October 2024, after a similar mid-season lull.

In a recent update, the team of hurricane seasonal forecasters at Colorado State University said dry and stable conditions in the Atlantic and shearing winds have created unfavorable conditions for storms to form. The team still expects conditions to become more conducive to storms.

Storm tracker

The forecast track map below shows the most likely path of the center of a storm, once it forms. It does not illustrate the full width of the storm or its impacts. The center of the storm is likely to travel outside the cone up to 33% of the time.

Contributing: Jennifer Borresen, USA TODAY Graphics

Dinah Voyles Pulver, a national correspondent for USA TODAY, has written about hurricanes, tornadoes and violent weather for more than 30 years. Reach her at dpulver@usatoday.com or @dinahvp on Bluesky or X or dinahvp.77 on Signal.

This article originally appeared on USA TODAY: National Hurricane Center anticipates Tropical Storm Gabrielle