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Hurricane Paulette Forecast Discussion Number 34
2020-09-15 10:31:23| National Hurricane Center (Atlantic)
Issued at 500 AM AST Tue Sep 15 2020 671 WTNT42 KNHC 150831 TCDAT2 Hurricane Paulette Discussion Number 34 NWS National Hurricane Center Miami FL AL172020 500 AM AST Tue Sep 15 2020 Paulette has generally changed little overnight. The hurricane still has a central dense overcast feature with an eye occasionally evident in satellite images. Convective banding remains well organized, especially to the north of the center. The satellite intensity estimates range from 77 to 102 kt and based on that data, the initial intensity is again held at 90 kt. The hurricane could strengthen slightly in the short term due to a combination of baroclinic influences from an approaching trough and relatively warm water beneath the cyclone. However, a steady weakening trend should commence on Wednesday when Paulette moves over much cooler waters and into an environment of strong wind shear. These factors should ultimately lead to extratropical transition, which is forecast to be complete by day 3. However, some of the guidance suggests that this could occur up to a day sooner than that. The NHC intensity forecast is near a blend of the HCCA, IVCN, and GFS models. Paulette continues to pick up speed, and the latest initial motion estimate is northeastward at 17 kt. The hurricane is expected to accelerate northeastward even more during the next couple of days as it becomes more embedded in the mid-latitude westerlies. After a few days, however, Paulette will likely turn southeastward and then southward as it moves in the flow on the west side of a cut off deep-layer low. There are some differences in the models on how sharply Paulette turns southward, but they generally agree on the overall scenario. The NHC track forecast lies roughly between the HCCA and TVCA consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 15/0900Z 37.0N 60.5W 90 KT 105 MPH 12H 15/1800Z 38.9N 56.8W 100 KT 115 MPH 24H 16/0600Z 41.3N 50.9W 95 KT 110 MPH 36H 16/1800Z 43.7N 44.2W 75 KT 85 MPH 48H 17/0600Z 45.4N 39.0W 60 KT 70 MPH 60H 17/1800Z 46.0N 35.1W 45 KT 50 MPH 72H 18/0600Z 44.9N 34.2W 40 KT 45 MPH...POST-TROP/EXTRATROP 96H 19/0600Z 41.6N 33.3W 35 KT 40 MPH...POST-TROP/EXTRATROP 120H 20/0600Z 38.7N 32.7W 35 KT 40 MPH...POST-TROP/EXTRATROP $$ Forecaster Cangialosi [ more ]
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