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Tropical Storm Karina Forecast Discussion Number 11
2020-09-15 16:33:35| National Hurricane Center (East Pacific)
Issued at 800 AM PDT Tue Sep 15 2020 000 WTPZ41 KNHC 151433 TCDEP1 Tropical Storm Karina Discussion Number 11 NWS National Hurricane Center Miami FL EP162020 800 AM PDT Tue Sep 15 2020 Karina has changed little in organization over the past several hours with a concentrated area of deep convection mostly over the southwestern portion of the circulation and over the estimated position of the low-level center. The initial intensity is kept at 50 kt based on a blend of the latest Dvorak CI numbers from TAFB and SAB and the objective UW-CIMSS ADT. Karina is now crossing the 26 isotherm, so it is unlikely that any further strengthening will occur. The cyclone is forecast to move over progressively cooler waters and into a drier, more stable atmosphere over the next couple of days. These conditions should induce a weakening trend soon, and the deep convection is expected to gradually wane during that time. Karina is forecast to become a convection-free remnant low by 60 h, or perhaps a little sooner. The latest NHC intensity forecast is in good agreement with the various guidance aids. The initial motion of the tropical storm is 310/09 kt, as it continues to move along the periphery of a mid-level ridge to its northeast. This general motion should continue while the system maintains convection. As the system becomes devoid of convection, a turn to the west and west-southwest is anticipated as the cyclone moves within the low-level flow. FORECAST POSITIONS AND MAX WINDS INIT 15/1500Z 20.4N 121.1W 50 KT 60 MPH 12H 16/0000Z 21.3N 122.2W 45 KT 50 MPH 24H 16/1200Z 22.4N 123.9W 40 KT 45 MPH 36H 17/0000Z 23.3N 125.2W 35 KT 40 MPH 48H 17/1200Z 23.7N 126.2W 30 KT 35 MPH 60H 18/0000Z 23.9N 127.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 18/1200Z 23.5N 128.3W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 19/1200Z 22.6N 130.7W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 20/1200Z...DISSIPATED $$ Forecaster Latto
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