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Tropical Storm Theta Forecast Discussion Number 12
2020-11-12 21:47:27| National Hurricane Center (Atlantic)
Issued at 900 PM GMT Thu Nov 12 2020 000 WTNT45 KNHC 122047 TCDAT5 Tropical Storm Theta Discussion Number 12 NWS National Hurricane Center Miami FL AL302020 900 PM GMT Thu Nov 12 2020 The appearance and structure of Theta has changed little today, with intermittent bursts of convection wrapping mostly around the center of circulation. There has been no new observational data since last night, and it is still assumed that the cyclone's intensity remains a somewhat uncertain 55 kt due to the consistency of its appearance. Theta's motion over the past 12 h is 090/10 kt as the cyclone continues to be steered around the north side of a mid-level ridge. A slower east-southeastward motion is expected from 36-72 h as the mid-level ridge to the south weakens and mid- to upper-level northerly flow moves over Theta. After 72 h, Theta or its remnants are expected to turn northeastward or northward and accelerate in the low-level flow ahead of an approaching mid-latitude cyclone over the northeastern Atlantic. The latest track forecast has changed little from the previous one and remains near the multi-model consensus tracks. The shear across Theta is expected to relax somewhat over the next day or so, while the cyclone moves over cooler waters. These counteracting effects should allow the cyclone to maintain its intensity during that time. By this weekend, strong northerly shear is expected to impact Theta, while stable air gets entrained into its circulation. This should cause the cyclone to weaken, with the system likely degenerating into a remnant low by Sunday. The latest NHC intensity forecast is essentially unchanged from the previous one and is close to the various consensus models. FORECAST POSITIONS AND MAX WINDS INIT 12/2100Z 31.7N 27.4W 55 KT 65 MPH 12H 13/0600Z 31.8N 25.7W 55 KT 65 MPH 24H 13/1800Z 31.8N 23.4W 55 KT 65 MPH 36H 14/0600Z 31.5N 21.5W 55 KT 65 MPH 48H 14/1800Z 31.2N 20.2W 45 KT 50 MPH 60H 15/0600Z 31.1N 19.4W 35 KT 40 MPH 72H 15/1800Z 31.4N 19.1W 30 KT 35 MPH...POST-TROP/REMNT LOW 96H 16/1800Z 34.0N 19.1W 30 KT 35 MPH...POST-TROP/REMNT LOW 120H 17/1800Z 38.4N 15.4W 30 KT 35 MPH...POST-TROP/REMNT LOW $$ Forecaster Latto
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