NHC issues Tropical Cyclone Discussion (TCD) at Sep 30, 1:00 PM AST949
WTNT42 KNHC 300838
TCDAT2
Tropical Depression Twelve Discussion Number 3
NWS National Hurricane Center Miami FL AL122024
500 AM AST Mon Sep 30 2024
Tropical Depression Twelve has become better organized overnight. A
29/2338 UTC ASCAT-B overpass showed a large area of 25 to 30 kt
winds, and that the center was located near the northern edge of the
large convective mass. Although a 30/0334 UTC AMSR2 microwave image
showed that the center was still located near the northern edge of
the central convective area, curved banding has been increasing
during the night, with a large area of cold cloud tops persisting.
Subjective Dvorak intensity estimates are a consensus T-2.0/30 kt
from both TAFB and SAB. Objective intensity estimates from UW-CIMSS
are rising and now range from 36 to 41 kt. Based on the subjective
Dvorak estimates, a 30 kt initial intensity is held for this
advisory, but the depression is likely very near tropical storm
strength.
The estimated initial motion of the depression is westward, or 275/7
kt. The cyclone will continue moving westward to west-northwestward
for another couple days while a well-established subtropical ridge
remains in place to the north of the system. A gradual turn to the
northwest is expected around mid-week as a deep-layer trough over
the north-central Atlantic weakens the ridge. At the end of the
forecast period, an approaching upper-level trough near Bermuda will
induce the cyclone to turn northward over the open waters of the
central Atlantic Ocean. Some along-track spread is noted in the
various track model solutions, but the models are in good agreement
on the northward turn, with little cross-track spread. The latest
NHC track forecast is nearly identical to the previous one, and is
about halfway between the slower GFS solution and the faster ECMWF
model.
Conditions are quite favorable along the path of the depression with
29 degree C sea-surface temperatures, a moist environment, and weak
vertical wind shear. Given the weak shear and the gradually
improving structure, the cyclone should begin to steadily intensify
soon. The depression is forecast to become a hurricane in 36 to 48
hours and a major hurricane in about 4 days. The NHC intensity
forecast is similar to the previous one, and lies between the middle
and upper end of the intensity guidance suite, near the HCCA and
IVCN multi-model consensus aids. It should be noted that most of
the models indicate that the cyclone's wind and wave field will
expand significantly over the next several days, and the system is
forecast to become a large and powerful hurricane as it gains
latitude later this week.
FORECAST POSITIONS AND MAX WINDS
INIT 30/0900Z 14.0N 34.1W 30 KT 35 MPH
12H 30/1800Z 14.1N 35.7W 40 KT 45 MPH
24H 01/0600Z 14.3N 37.9W 50 KT 60 MPH
36H 01/1800Z 14.9N 39.8W 60 KT 70 MPH
48H 02/0600Z 15.8N 41.4W 70 KT 80 MPH
60H 02/1800Z 17.1N 42.7W 80 KT 90 MPH
72H 03/0600Z 18.4N 44.1W 90 KT 105 MPH
96H 04/0600Z 20.7N 46.5W 105 KT 120 MPH
120H 05/0600Z 23.4N 48.5W 105 KT 120 MPH
$$
Forecaster Hagen
Source:
NHC issues Tropical Cyclone Discussion (TCD) at Sep 30, 1:00 PM AST---------------
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