The Pacific Disaster Center’s (PDC Global) Saturday, September 13, 2025, Tropical Cyclone Activity Report…for the Pacific Ocean, the Indian Ocean, and adjacent Seas
Current Tropical Cyclones:
There are no Tropical Cyclones
Northeast Pacific Ocean: There are no Tropical Cyclones
Off the coast of Southwestern Mexico:
>>> An area of low pressure could develop well offshore of the coast of southern or southwestern Mexico early next week. Environmental conditions are expected to be conducive for gradual development thereafter, as the low tracks westward to west-northwestward around 10 to 15 mph.
*Formation chance through 48 hours…low…near 0 percent
*Formation chance through 7 days…low…20 percent
South of Baja California Peninsula:
>>> An area of low pressure could develop south of the Baja California Peninsula over the next day or two. Environmental conditions are expected to be conducive for gradual development thereafter, as the low tracks slowly westward.
*Formation chance through 48 hours…low…near 0 percent
*Formation chance through 7 days…low…20 percent
Central Pacific Ocean: There are no Tropical Cyclones
South and southeast of the Hawaiian Islands:
>>> An area of low pressure well southeast of the Hawaiian Islands is producing a large area of disorganized showers and thunderstorms. Environmental conditions appear conducive for some gradual development of this system as it moves westward or west-northwestward at around 10 mph.
*Formation chance through 48 hours…low…near 0 percent
*Formation chance through 7 days…low…20 percent
Western Pacific, Indian Ocean, and adjacent Seas: There are no Tropical Cyclones
Western Pacific
>>> There’s an area of disturbed weather being referred to as Invest 98W, which is located approximately 128 NM east-southeast of Legazpi
Animated multi-spectral satellite imagery (msi) depicts flaring convection to the northwest with a weakly defined low level circulation center (llcc). A 130029z ascat image shows 15-20 knot winds wrapping from the northern periphery with weaker winds to the south.
Environmental analysis for the area indicates marginally favorable conditions for development with low vertical wind shear (10-15 kts) and warm sea surface temperatures (30 c), offset by interaction with the Philippines and weak equatorward outflow aloft.
Global deterministic models are in agreement that 98W will move westward over the Philippines with little development. As for ensembles, ECENS is more aggressive in the short term than GEFS.
Maximum sustained surface winds are estimated at 13 to 18 knots.
The potential for the development of a significant tropical cyclone within the next 24 hours remains low.
South Indian Ocean
>>> There’s an area of disturbed weather being referred to as Invest 93S, which is located approximately 338 NM west-northwest of Cocos Islands
Animated multi-spectral satellite imagery (msi) does not depict a definable low level circulation center (llcc) for invest 93s, only a very broad and ill-defined rotation with convection being sheared to the southern periphery. A 112122z ssmis 91ghz microwave image depicted an ill-defined and elongated rotation displaced to the northeast of a patch of disorganized convection.
Environmental analysis reveals marginal to favorable environment for development with low to moderate vertical wind shear (20-25 knots), strong upper level equatorward outflow and
warm (27-28 c) sea surface temperature.
Deterministic models have rapidly backed off on development over the last couple runs, with no models showing significant development within the next 24 hours. However, ensemble models are continuing to depict a modest amount of development during the same time window. Both global and ensemble guidance agree on a west-southwestward track over the next 24-36 hours.
Maximum sustained surface winds are estimated at 22 to 28 knots.
The potential for the development of a significant tropical cyclone within the next 24 hours remains low.
