Official Discussion issued by the National Hurricane Center

Rene (AL182020) DATA RELEASED: 9/9/2020 3:00:00 PM UTC

Copy of official data

Tropical Storm Rene Discussion Number  10
NWS National Hurricane Center Miami FL       AL182020
1100 AM AST Wed Sep 09 2020

Although easterly shear has been affecting the system, Rene is 
producing vigorous deep convection, along with a broad convective 
band, over its western semicircle.  Scatterometer data indicate 
winds to 35 knots over the northwestern quadrant, and therefore the 
system is again being designated as a tropical storm.  The cyclone 
should be within an environment of moderate vertical shear, on the 
western side of an upper-level anticyclone, for the next couple of 
days.  Therefore, gradual strengthening is forecast, and Rene is 
expected to become a hurricane late this week.  By the weekend, 
increasing westerly shear should cause weakening.  The official 
intensity forecast is a little above the model consensus.

Rene is currently moving west-northwestward, or 285/11 kt, on the 
southern side of a mid-level ridge.  A weakness in the ridge near 
40W longitude is likely to cause the storm to turn toward the 
northwest in 2 to 3 days, followed by a turn toward the 
north-northwest.  By the end of the forecast period, Rene's forward 
progress should slow as it encounters a block in the mid-level 
flow.  As anticipated, the official track forecast is shifted to 
the left of the previous one, but not as far to the left as the 
latest corrected multi-model consensus. 


INIT  09/1500Z 17.6N  31.5W   35 KT  40 MPH
12H  10/0000Z 18.1N  33.1W   40 KT  45 MPH
24H  10/1200Z 18.8N  35.1W   45 KT  50 MPH
36H  11/0000Z 19.5N  37.0W   50 KT  60 MPH
48H  11/1200Z 20.4N  39.0W   60 KT  70 MPH
60H  12/0000Z 21.7N  40.9W   65 KT  75 MPH
72H  12/1200Z 23.5N  42.7W   60 KT  70 MPH
96H  13/1200Z 27.0N  44.5W   50 KT  60 MPH
120H  14/1200Z 28.7N  45.0W   40 KT  45 MPH

Forecaster Pasch