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Tropical Storm Norbert Forecast Discussion Number 8
2020-10-07 16:47:39| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Wed Oct 07 2020 323 WTPZ44 KNHC 071447 TCDEP4 Tropical Storm Norbert Discussion Number 8 NWS National Hurricane Center Miami FL EP192020 900 AM MDT Wed Oct 07 2020 Norbert has recovered somewhat from the dry air intrusion that occurred last night. A new burst of deep convection developed near the center early this morning, but the associated cloud tops are beginning to warm and the convection is becoming displaced over the northeastern portion of the circulation. The initial intensity is being held at 35 kt, and is based off the Dvorak intensity estimates from TAFB, SAB, and the UW-CIMSS ADT. The storm is struggling to stay organized despite being over warm waters and in an environment of relatively low shear. By Thursday, the SHIPS guidance suggests that the shear will increase to around 10-15 kt. This shear, along with occasional dry air intrusions similar to one experienced last night, could gradually weaken the system. On the other hand, the warm waters could counteract the moderately negative environmental factors. The latest NHC forecast still favors the latter scenario, and shows Norbert remaining a 35-kt tropical storm throughout the forecast period. This intensity forecast is unchanged from the previous one, and is a compromise between the SHIPS guidance and the model consensus. The initial motion is stationary, although the exact center location has been difficult to pinpoint this morning. The steering flow is forecast to remain very weak over the next couple of days, and most of the models show little movement through tonight followed by a slow westward drift Wednesday through Thursday. By late this week, a mid-level ridge is forecast to build to the north to northeast of the cyclone, which should force Norbert on a west-northwestward track. The latest NHC track forecast is near the previous one through 72 h, but was adjusted a little north after that time due to a northward shift in the guidance. However, the new track forecast remains south of the consensus aids late in the forecast period. FORECAST POSITIONS AND MAX WINDS INIT 07/1500Z 14.2N 107.1W 35 KT 40 MPH 12H 08/0000Z 14.1N 107.1W 35 KT 40 MPH 24H 08/1200Z 14.0N 107.2W 35 KT 40 MPH 36H 09/0000Z 13.9N 107.5W 35 KT 40 MPH 48H 09/1200Z 13.8N 107.9W 35 KT 40 MPH 60H 10/0000Z 14.1N 108.5W 35 KT 40 MPH 72H 10/1200Z 14.9N 109.3W 35 KT 40 MPH 96H 11/1200Z 16.5N 111.0W 35 KT 40 MPH 120H 12/1200Z 17.5N 112.2W 35 KT 40 MPH $$ Forecaster Latto
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