Post-Tropical Cyclone Iselle Discussion Number 15

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Post-Tropical Cyclone Iselle Discussion Number 15 NWS National Hurricane Center Miami FL EP092026 800 PM PDT Wed Aug 26 2026 Iselle continues to have no deep convective organization this evening with the low-level center still fully exposed due to dry air and moderate wind shear. With the lack of convection occuring, Iselle is now considered to have become a Post-Tropical Cyclone. The most recent TAFB Dvorak fix has 1.5/25 kt and the objective satellite intensity estimates are in the range of 25-43 kt. Based on that data, the current NHC initial intensity has been set to 30 kt. Iselle should continue to move west-northwestward over the next couple of days, steered by a mid-level ridge to the north of the cyclone. Increasing wind shear, cooler sea surface temperatures, and a drier air mass will continue to weaken the system. The post-tropical remnant low is expected to gradually spin down and open into a trough in about 2 to 3 days. However, it still remains possible that the cyclone could spin down even sooner. Very minor adjustments were made to the previous NHC track and intensity forecasts. For additional information on the remnant low please see High Seas Forecasts issued by the National Weather Service, under AWIPS header NFDHSFEPI, WMO header FZPN01 KWBC, and on the web at ocean.weather.gov/shtml/NFDHSFEPI.php FORECAST POSITIONS AND MAX WINDS INIT 27/0300Z 23.0N 125.9W 30 KT 35 MPH...POST-TROP/REMNT LOW 12H 27/1200Z 23.6N 127.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 24H 28/0000Z 24.3N 128.8W 20 KT 25 MPH...POST-TROP/REMNT LOW 36H 28/1200Z 24.8N 130.2W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 29/0000Z 25.3N 131.6W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 29/1200Z...DISSIPATED