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Tropical Depression Rene Forecast Discussion Number 9
2020-09-09 10:46:48| National Hurricane Center (Atlantic)
Issued at 500 AM AST Wed Sep 09 2020 000 WTNT43 KNHC 090846 TCDAT3 Tropical Depression Rene Discussion Number 9 NWS National Hurricane Center Miami FL AL182020 500 AM AST Wed Sep 09 2020 Satellite imagery indicates that convection associated with Rene is increasing and becoming better organized, with a broad convective band forming in the western semicircle. Satellite intensity estimates indicate that the cyclone is close to regaining tropical storm strength, but the initial intensity will be held at 30 kt to see if the convection persists and what upcoming scatterometer data shows. The initial motion is west-northwestward or 285/12 kt. There is little change in the forecast philosophy for the first 48-60 h of the forecast, with Rene expected to continue west-northwestward. This part of the new forecast track is similar to the previous track. After 60 h, much of the track guidance has shifted significantly to the left and shows less of a northward turn by 96-120 hr. This shift has left the GFS and the old forecast on the right side of the guidance envelope. This part of the new forecast track is moved to the left of the previous track, but it lies to the right of the various consensus models. If the current guidance trends continue, additional westward shifts of the later part of the forecast track may be necessary in subsequent advisories, Conditions appear generally favorable for Rene to strengthen during the next 48-60 h, although the cyclone will be moving over sea surface temperatures of near 26.5C during that time. The intensity forecast calls for Rene to re-intensify and become a hurricane by the 60 h point. After that, the cyclone is likely to encounter moderate to strong northwesterly shear which should cause weakening. The new intensity forecast is unchanged since the previous forecast, and it lies between the ICON and HCCA intensity consensus forecasts. FORECAST POSITIONS AND MAX WINDS INIT 09/0900Z 17.4N 30.5W 30 KT 35 MPH 12H 09/1800Z 17.9N 32.4W 35 KT 40 MPH 24H 10/0600Z 18.7N 34.6W 40 KT 45 MPH 36H 10/1800Z 19.6N 36.7W 50 KT 60 MPH 48H 11/0600Z 20.8N 38.7W 60 KT 70 MPH 60H 11/1800Z 22.2N 40.4W 65 KT 75 MPH 72H 12/0600Z 24.2N 41.9W 60 KT 70 MPH 96H 13/0600Z 28.0N 43.0W 50 KT 60 MPH 120H 14/0600Z 30.0N 42.5W 40 KT 45 MPH $$ Forecaster Beven
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