Post-Tropical Cyclone Isaac Discussion Number  19
NWS National Hurricane Center Miami FL       AL102024
300 PM GMT Mon Sep 30 2024

Geostationary satellite data this morning indicates that Isaac has 
completed its transition to a Post-Tropical Extratropical Low and 
this will be the last NHC advisory. The remaining moderate-to-deep 
convection has sheared off to the northeast as stable stratocumulus 
clouds have fully infiltrated its low-level circulation from the 
west. The initial intensity has been lowered to 50 kt blending the 
latest subjective and objective measurements.

The post-tropical cyclone is still moving east-northeastward at 
about 065/15 kt. A subtle turn to the northeast is still expected 
over the next couple of days as the cyclone remains embedded in the 
mid-latitude westerlies. The guidance has shifted a bit east of the 
prior forecast track, partially a reflection of the more eastward 
initial position, and the NHC track was nudged in that direction. 
Over the forecast period, the cyclone is expected to slowly weaken, 
lacking baroclinic support for much non-tropical development. The 
low should ultimately dissipate in the far North Atlantic to the 
west of Ireland before the end of the week.

Additional information on this system can be found in 
High Seas Forecasts issued by Meteo France and the the UK Met 
Office. Links to each product are provided below:

Meteo France: WMO header FQNT50 LFPW and available on the web at 
www.meteofrance.com/previsions-meteo-marine/bulletin/grandlarge/ 
metarea2.

UK Met Office: WMO header FQNT21 EGRR and on the web at 
metoffice.gov.uk/weather/specialist-forecasts/coast-and-sea/high- 
seas-forecast/.

FORECAST POSITIONS AND MAX WINDS

INIT  30/1500Z 44.8N  29.1W   50 KT  60 MPH...POST-TROP/EXTRATROP
12H  01/0000Z 46.0N  26.2W   45 KT  50 MPH...POST-TROP/EXTRATROP
24H  01/1200Z 47.6N  23.6W   40 KT  45 MPH...POST-TROP/EXTRATROP
36H  02/0000Z 49.3N  22.0W   35 KT  40 MPH...POST-TROP/EXTRATROP
48H  02/1200Z 50.6N  20.7W   35 KT  40 MPH...POST-TROP/EXTRATROP
60H  03/0000Z 52.0N  19.3W   35 KT  40 MPH...POST-TROP/EXTRATROP
72H  03/1200Z 54.0N  17.5W   30 KT  35 MPH...POST-TROP/EXTRATROP
96H  04/1200Z...DISSIPATED

$$
Forecaster Papin