{"id": "1209924790980214786", "title": "Tropical Cyclone Discussion", "adv_date": "2026-09-13T15:00:00Z", "msg": "108\nWTPZ44 KNHC 131435\nTCDEP4\n \nTropical Storm Norbert Discussion Number  16\nNWS National Hurricane Center Miami FL       EP142026\n500 AM HST Sun Sep 13 2026\n \nNorbert\u2019s overnight burst of convection has faded since the previous\nadvisory, however proxy-visible satellite imagery shows that a new\nconvective burst appears to be developing. Water vapor imagery \nshows that there is still plenty of dry air surrounding the system. \nThe latest TAFB Dvorak fix came in with an intensity of 45 kt, and \nthe UW-CIMSS objective intensity estimates are in the range of \n37-43 kt. Therefore the initial intensity remains at 45 kt for this \nadvisory.\n \nThe initial motion is estimated to be 285/10 kt. The storm is\nexpected to move west-northwestward to westward as it moves to the\nsouth of a low- to mid-level subtropical ridge. The track guidance\ncontinue to show good agreement on this general heading of the \ncyclone. The current NHC track forecast has been nudged a little \nright of the previous forecast track and remains close to the \nmulti-model consensus (HCCA) and the Google DeepMind (GDMI) \nensemble mean.\n \nSome fluctuations in intensity are possible in the short term as \nNorbert remains in a marginal environment. The cyclone is contending \nwith mid-level dry air intrusions and light west-southwesterly \nvertical wind shear.  After 12 h, the wind shear is expected to \nincrease, which should result in a generally weakening trend. Around \n60 h, the simulated GFS and ECMWF satellite imagery shows that the \ncyclone should lose organized deep convection and it is therefore \nexpected to become a post-tropical remnant low and then dissipated \naround 72 h. The current NHC intensity forecast is in line with the \nlatest guidance including the HCCA and GDMI. \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  13/1500Z 18.2N 132.7W   45 KT  50 MPH\n 12H  14/0000Z 18.6N 134.4W   45 KT  50 MPH\n 24H  14/1200Z 19.0N 137.0W   40 KT  45 MPH\n 36H  15/0000Z 19.4N 139.7W   35 KT  40 MPH\n 48H  15/1200Z 19.7N 142.4W   35 KT  40 MPH\n 60H  16/0000Z 19.8N 145.1W   30 KT  35 MPH...POST-TROP/REMNT LOW\n 72H  16/1200Z...DISSIPATED\n \n"}