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Tropical Storm Theta Forecast Discussion Number 16
2020-11-13 21:38:13| National Hurricane Center (Atlantic)
Issued at 900 PM GMT Fri Nov 13 2020 000 WTNT45 KNHC 132038 TCDAT5 Tropical Storm Theta Discussion Number 16 NWS National Hurricane Center Miami FL AL302020 900 PM GMT Fri Nov 13 2020 Theta appears to be holding its own still, with a large curved band feature characterizing the bulk of the deep convection, and a smaller area of convection intermittently developing over the center. Like yesterday, there has been a lack of observational data over the system's core since last night. However, since Theta's organization has not appeared to change much since that time, the initial intensity is being kept at a somewhat uncertain 50 kt. Theta is forecast to change little in intensity into tonight as the cyclone continues moving in a relatively low shear zone associated with a mid- to upper-level trough axis. By tomorrow, strong northerly shear is forecast to begin impacting the system while stable air gets entrained into its circulation. As a result, Theta is expected to spin down over the weekend, degenerate to a remnant low on Sunday, and dissipate by the middle of next week. Theta is moving eastward at around 9 kt, steered by a mid-level ridge extending westward from west Africa to the eastern tropical Atlantic. A turn to the east-southeast along with a gradual slowing of the forward motion is expected overnight and continuing through the weekend as the ridge weakens, and mid- to upper level northerly winds impart on the cyclone. Early next week, what remains of Theta are expected to turn northward and then accelerate northeastward as a mid-latitude cyclone passes to the north of the region. The NHC forecast is little changed from the previous one and lies near the various consensus aids. On the forecast track, the center of Theta is forecast to track very near the westernmost Canary Islands. However, the system is forecast to weaken to a remnant low before reaching those islands. FORECAST POSITIONS AND MAX WINDS INIT 13/2100Z 31.9N 22.6W 50 KT 60 MPH 12H 14/0600Z 31.7N 21.0W 50 KT 60 MPH 24H 14/1800Z 31.4N 19.2W 45 KT 50 MPH 36H 15/0600Z 31.3N 18.2W 40 KT 45 MPH 48H 15/1800Z 31.7N 17.7W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 16/0600Z 32.5N 17.7W 30 KT 35 MPH...POST-TROP/REMNT LOW 72H 16/1800Z 34.4N 17.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 17/1800Z 39.2N 12.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 18/1800Z...DISSIPATED $$ Forecaster Latto
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