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Tropical Storm Norbert Forecast Discussion Number 23
2020-10-14 16:46:13| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Wed Oct 14 2020 000 WTPZ44 KNHC 141446 TCDEP4 Tropical Storm Norbert Discussion Number 23 NWS National Hurricane Center Miami FL EP192020 900 AM MDT Wed Oct 14 2020 Recent satellite imagery suggests Norbert is beginning to feel the effects of deep-layer shear and drier mid-level air associated with a mid- to upper-level low pressure system centered to its west-northwest. While Norbert still shows signs of organization, the deepest convection is now displaced to the north of the estimated center position. The advisory intensity is held at 35 kt this morning based on objective and subjective current intensity Dvorak estimates from UW-CIMSS, SAB, and TAFB. It is likely that Norbert has peaked in terms of its intensity. Norbert's estimated initial motion is 325/13 kt. The cyclone is moving northwestward between a mid-level ridge over northern Mexico and the aforementioned mid- to upper-level low. This motion is expected to continue for the next 24 h, with a gradual decrease in forward speed as the upper low pulls away from Norbert. There is increasing spread noted in the model track guidance as the steering flow weakens between 24-48 h, but the general trend is for a slightly more northward motion during this time. Only minor adjustments were made to the official NHC track forecast, which remains close to the various consensus aids including TVCE and HCCA. Increasing deep-layer shear, drier mid-level air, and cooler sea-surface temperatures are expected to induce a weakening trend beginning later today, and Norbert will likely become a tropical depression this afternoon. The GFS simulated satellite imagery suggests Norbert will lose its deep convection within the next 24-36 h, and the official NHC forecast shows the system degenerating to a remnant low before dissipation at 48 h. FORECAST POSITIONS AND MAX WINDS INIT 14/1500Z 23.1N 114.0W 35 KT 40 MPH 12H 15/0000Z 24.4N 115.0W 30 KT 35 MPH 24H 15/1200Z 25.6N 115.7W 25 KT 30 MPH 36H 16/0000Z 26.6N 115.9W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 16/1200Z...DISSIPATED $$ Forecaster Reinhart/Beven
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