Official Discussion issued by the National Hurricane Center

Margot (AL142023) DATA RELEASED: 9/15/2023 9:00:00 AM UTC

Copy of official data

Tropical Storm Margot Discussion Number  32
NWS National Hurricane Center Miami FL       AL142023
900 AM GMT Fri Sep 15 2023

Margot is producing small, intermittent bursts of convection near 
its partially exposed low-level center this morning. An ASCAT pass 
over the western portion of the circulation from last night showed 
that the winds within the max wind band have decreased by about 
10-15 kt from 24 h ago, with peak vectors slightly above 50 kt. 
These data and the current satellite presentation indicate Margot is 
likely no longer a hurricane. The initial intensity is lowered to 60 
kt for this advisory, which remains above the highest available 
satellite intensity estimates. 

The tropical storm is drifting east-southeastward (115/3 kt) within 
weak steering currents, as a mid-level ridge continues to build over 
the north Atlantic. Margot is forecast to make a clockwise loop 
while it pivots around this ridge during the next couple of days. 
The latest NHC forecast shows a slightly broader loop that is 
consistent with the latest multi-model consensus aids. By early next 
week, the ridge is forecast to become oriented to the east and south 
of Margot, and the cyclone should turn northward and then eastward 
within the flow between this feature and mid-latitude westerlies. 
There is greater uncertainty in the long-range track forecast given 
mixed signals in the global guidance as to whether Margot gets fully 
caught in the westerlies (GFS) or stays farther south and continues 
to meander over the central Atlantic (ECMWF). For now, the NHC 
forecast is held near the simple consensus aids. 

Margot is likely to continue weakening during the next couple of 
days while it meanders over its own cool wake of sub-26C SSTs in an 
increasingly dry and stable airmass. By Sunday, it could briefly 
encounter slightly warmer waters while moving westward, but the 
upper-level winds do not appear very conducive for much 
strengthening. In fact, the GFS and ECMWF simulated satellite 
imagery suggest Margot could struggle at times to sustain enough 
organized convection to remain a tropical cyclone. While the 
guidance suite suggests some minor intensity fluctuations are 
possible during this period, the NHC intensity forecast remains 
steady between 48-96 h in agreement with the IVCN consensus aid.


INIT  15/0900Z 36.7N  38.6W   60 KT  70 MPH
12H  15/1800Z 36.3N  38.5W   60 KT  70 MPH
24H  16/0600Z 35.7N  38.8W   55 KT  65 MPH
36H  16/1800Z 35.1N  40.1W   50 KT  60 MPH
48H  17/0600Z 34.8N  41.6W   45 KT  50 MPH
60H  17/1800Z 35.3N  43.0W   45 KT  50 MPH
72H  18/0600Z 36.5N  43.6W   45 KT  50 MPH
96H  19/0600Z 39.5N  40.0W   45 KT  50 MPH
120H  20/0600Z 40.0N  34.0W   40 KT  45 MPH...POST-TROP/EXTRATROP

Forecaster Reinhart