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#1015944 (Received by flhurricane at: 4:54 AM 10.Sep.2020)
TCDAT3

Tropical Storm Rene Discussion Number 13
NWS National Hurricane Center Miami FL AL182020
500 AM AST Thu Sep 10 2020

Several recent microwave overpasses indicate that Rene continues to
be affected by easterly shear, with the low-level center located
near the eastern edge of the ongoing bursting convection. Various
subjective and objective satellite intensity estimates are in the
35-45 kt range and have changed little since the last advisory.
Based on that, the initial intensity remains 35 kt.

The initial motion is west-northwestward or 285/9 kt. There is no
change in the overall track forecast philosophy. Rene should move
generally west-northwestward for the next couple of days, followed
by a turn toward the northwest into a weakness in the subtropical
ridge partly caused by Tropical Storm Paulette. Late in the
forecast period, the track forecast becomes more problematic due to
uncertainties in how much ridging will build north of Rene and how
close it will be to the larger Paulette. The track guidance during
this time shows increasing spread and some westward shift from the
previous advisory. The new NHC forecast track is similar to the
previous track through 72 h, then it lies to the left of the
previous track at 96 and 120 h. However, at these times, it lies
to the right of the various consensus models.

The shear should gradually diminish during the next 48-60 h, and
this should allow Rene to strengthen to or near hurricane strength.
After that time, strong west-northwesterly shear is expected to
cause gradual weakening despite the cyclone moving over increasing
sea surface temperatures. The new official intensity forecast is
unchanged from the previous forecast. It lies near the various
intensity consensus models through 72 h, but is weaker than those
models at 96 and 120 h.


FORECAST POSITIONS AND MAX WINDS

INIT 10/0900Z 18.2N 34.8W 35 KT 40 MPH
12H 10/1800Z 18.6N 36.2W 40 KT 45 MPH
24H 11/0600Z 19.1N 38.1W 45 KT 50 MPH
36H 11/1800Z 19.8N 40.2W 50 KT 60 MPH
48H 12/0600Z 21.0N 42.2W 60 KT 70 MPH
60H 12/1800Z 22.4N 44.1W 65 KT 75 MPH
72H 13/0600Z 24.1N 45.7W 60 KT 70 MPH
96H 14/0600Z 27.0N 47.5W 50 KT 60 MPH
120H 15/0600Z 28.6N 49.0W 40 KT 45 MPH

$$
Forecaster Beven