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Subtropical Depression Four Forecast Discussion Number 2
2020-06-23 04:37:29| National Hurricane Center (Atlantic)
Issued at 1100 PM AST Mon Jun 22 2020 000 WTNT44 KNHC 230237 TCDAT4 Subtropical Depression Four Discussion Number 2 NWS National Hurricane Center Miami FL AL042020 1100 PM AST Mon Jun 22 2020 The cyclone has little or no deep convection near its center, and remains situated beneath an upper-level low. Therefore, the system is still a subtropical cyclone and the intensity is kept at 30 kt in agreement with the most recent satellite classification from TAFB. The 30-kt intensity was also supported by recent scatterometer data. There is a small window of opportunity for strengthening since the system should remain over a relatively warm Gulf Stream eddy for 12 hours or so. Thereafter, a weakening trend is expected to begin and the system should make the transition to an extratropical cyclone over cooler waters in 36 hours or sooner. The global models indicate that the system should open up into a trough in a couple of days so the official forecast shows dissipation by 72 hours. It would not be surprising if the system meets its demise sooner than that. The official intensity forecast is similar to the latest decay-SHIPS guidance. The motion continues east-northeastward, or 060/9 kt. Over the next few days, the cyclone should remain embedded in a branch of west-southwesterlies that is split off from the main mid-latitude flow. There is good agreement in the track guidance that the system will turn northeastward with some acceleration during the next 48-60 hours. The official track forecast is similar to the previous one, and is also close to the dynamical model consensus. FORECAST POSITIONS AND MAX WINDS INIT 23/0300Z 38.7N 64.6W 30 KT 35 MPH 12H 23/1200Z 39.2N 62.9W 35 KT 40 MPH 24H 24/0000Z 40.3N 60.6W 30 KT 35 MPH 36H 24/1200Z 42.0N 58.5W 30 KT 35 MPH...POST-TROP/EXTRATROP 48H 25/0000Z 44.0N 55.5W 25 KT 30 MPH...POST-TROP/EXTRATROP 60H 25/1200Z 46.0N 52.0W 25 KT 30 MPH...POST-TROP/EXTRATROP 72H 26/0000Z...DISSIPATED $$ Forecaster Pasch
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