Advisories

000
WTPZ44 KNHC 261434
TCDEP4
 
Tropical Storm Iselle Discussion Number  13
NWS National Hurricane Center Miami FL       EP092026
800 AM PDT Wed Aug 26 2026
 
Wind shear and dry air continue to take a toll on Iselle this 
morning. The low-level center is fully exposed, with what little 
deep convection remains displaced over 100 n mi to the northeast. 
Earlier scatterometer data indicated winds were still around 40 to 
45 kt. However, given the recent degradation in satellite appearance 
and decreasing subjective and objective intensity estimates, the 
initial intensity is lowered to 40 kt for this advisory.
 
Iselle is expected to continue moving west-northwestward over the 
next few days, steered by a mid-level ridge to the north. Increasing 
wind shear, cooler sea surface temperatures, and a drier air mass 
will continue to weaken the cyclone, and it is likely to become 
devoid of deep convection by tonight. The latest NHC forecast 
follows these trends and indicates Iselle will become a 
post-tropical cyclone tonight. The remnant low is then expected to 
gradually spin down and open into a trough by day 3. The track and 
intensity forecasts are similar to the previous advisory, with only 
minor adjustments made toward the consensus aids.
 
 
FORECAST POSITIONS AND MAX WINDS
 
INIT  26/1500Z 22.2N 124.0W   40 KT  45 MPH
 12H  27/0000Z 22.5N 125.3W   35 KT  40 MPH...POST-TROPICAL
 24H  27/1200Z 23.2N 127.0W   30 KT  35 MPH...POST-TROP/REMNT LOW
 36H  28/0000Z 23.9N 128.8W   30 KT  35 MPH...POST-TROP/REMNT LOW
 48H  28/1200Z 24.5N 130.7W   25 KT  30 MPH...POST-TROP/REMNT LOW
 60H  29/0000Z 25.0N 132.4W   25 KT  30 MPH...POST-TROP/REMNT LOW
 72H  29/1200Z...DISSIPATED
 
$$
Forecaster Kelly