[Tropical] Tropical Cyclone Discussion
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Sat Sep 2 03:38:55 CDT 2023
WTNT42 KNHC 020838
TCDAT2
Tropical Storm Gert Discussion Number 18
NWS National Hurricane Center Miami FL AL062023
500 AM AST Sat Sep 02 2023
This morning's conventional satellite imagery and a recent AMSR2
microwave overpass indicate some improvement in the cloud pattern
overnight, although Gert's surface center remains near the
northern edge of the convective canopy where the colder cloud top
temperatures are evident. The subjective and objective satellite
intensity estimates have increased a bit during the past 6 hours,
and the initial intensity is bumped up to 40 kt for this advisory.
Gert's intensity shouldn't change much during the next few days
while the cyclone continues moving in a harsh northerly wind shear
environment. Gert is forecast to become a post-tropical cyclone
during the next couple of days as indicated in the global
models fields and their simulated infrared imagery forecasts.
Afterwards, Gert is expected to become absorbed by Post-Tropical
Idalia. The official intensity forecast follows the IVCN intensity
consensus aid through the period and indicates dissipation in 60
hours.
Gert should commence a northward track later today while the
southerly peripheral steering flow of larger Idalia captures the
cyclone and a subtropical ridge builds westward over the central
tropical Atlantic. There is quite a bit of along-track spread of
the models, however, so the best solution for the NHC forecast
track is to side with the consensus models, HCCA and TVCA through
dissipation early this week.
FORECAST POSITIONS AND MAX WINDS
INIT 02/0900Z 27.7N 54.3W 40 KT 45 MPH
12H 02/1800Z 28.0N 53.8W 40 KT 45 MPH
24H 03/0600Z 29.2N 53.1W 40 KT 45 MPH
36H 03/1800Z 30.8N 52.3W 35 KT 40 MPH
48H 04/0600Z 33.4N 51.7W 35 KT 40 MPH...POST-TROPICAL
60H 04/1800Z...DISSIPATED
$$
Forecaster Roberts
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