Tropical Cyclone 12L (Katia) / Invest 95L
Monday, September 4, 2023

Current Snapshot

For all the latest updates visit: DisasterAWARE

By PDC’s Senior Weather
Specialist Glenn James

The Pacific Disaster Center’s (PDC Global) Monday, September 4, 2023, Tropical Cyclone Activity Report…for the Atlantic Ocean, the Caribbean Sea, and the Gulf of Mexico


Post-Tropical Cyclone 12L (Katia)…is located about 1060 miles northwest of Cabo Verde Islands – Last Advisory


Tropical Cyclone 12L (Katia)


According to the NHC Advisory number 14…

The post-tropical cyclone is moving toward the northwest near 2 mph (4
km/h). Katia should slowly undergo a clockwise loop during the next two days and move more steadily southward by late Wednesday.

Maximum sustained winds are near 35 mph (55 km/h) with higher gusts. The system should gradually weaken and degenerate into a trough on

>>> Central Tropical Atlantic…

Invest 95L

Satellite imagery indicates that an area of low pressure has formed from the tropical wave centered about 700 miles west-southwest of the Cabo Verde Islands. The low-level circulation has become better defined since yesterday, with increasing organization in the shower and thunderstorm activity.

Environmental conditions are forecast to be conducive for further development, and this system is expected to become a tropical depression or a tropical storm in a day or two.

Additional strengthening is likely late this week while the system moves westward to west-northwestward at 15 to 20 mph over the central and western portions of the tropical Atlantic.

* Formation chance through 48 hours…high…90 percent
* Formation chance through 7 dayshigh…100 percent

>>> Eastern Tropical Atlantic…

A strong tropical wave over western Africa is forecast to move off the African coast in a couple of days.

Environmental conditions should support some slow development, and a tropical depression could form over the far eastern tropical Atlantic around the latter part of the week or the weekend while the wave moves to the west-northwest at about 15 mph.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 daysmedium…50 percent

>>> Northeastern Atlantic (ex-Franklin)…

Post-Tropical Cyclone Franklin is located several hundred miles north of the Azores and is forecast to move quickly southeastward towards warmer waters east of Azores.

This system could acquire some subtropical or tropical characteristics late this week or this weekend while it moves erratically between the Azores and Portugal.

* Formation chance through 48 hours…low…near 0 percent
* Formation chance through 7 days…low…20 percent