{"id": "1220753523725565954", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-21T21:00:00Z", "msg": "457\nWTPZ42 KNHC 212033\nTCDEP2\n \nTropical Storm Vance Discussion Number   2\nNWS National Hurricane Center Miami FL       EP222026\n300 PM CST Wed Oct 21 2026\n \nSatellite imagery shows that the system continues to produce deep\nconvection in improved banding features, as depicted in recent\nmicrowave images. An earlier scatterometer pass shortly after the\nprevious advisory showed that the low-level center was slightly\nfarther south and had a peak wind of 27 kt. The latest satellite\nintensity estimates from UW-CIMSS and TAFB are 32-35 kt, and using\nthese estimates, the initial intensity is raised to 35 kt for this\nadvisory, making the system Tropical Storm Vance.\n \nThe initial motion is estimated at 265/6 kt. A generally slow \nforward motion is expected with a turn toward the northwest and then \nnorth-northwest as the cyclone is steered along the southern and \nwestern periphery of a mid-level ridge located over Mexico. There \ncontinues to be some disagreement in the short term over when the \nturn toward the northwest will occur The GFS and hurricane regional \nmodels continue to show a southwest motion, while the HCCA and GDMI \nshow the system slowing and turning sooner. The latest NHC track \nforecast is closest to the HCCA and GDMI, the best-performing models \nthis season, and was shifted slightly to the right compared to the \nprevious one.\n \nVance is within a conducive environment for steady to rapid \nintensification (RI), with warm sea surface temperatures near \n29-30C, low wind shear, and favorable upper-level divergence. RI \nSHIPS and DTOPS guidance remains very bullish, showing RI over the \nnext 12-60 hours. The NHC intensity forecast follows suit and the \npeak intensity was increased slightly from the previous one, \nalthough it remains slightly below the GDMI and HCCA aids. In 72 \nhours, wind shear is forecast to increase and the system will move \ninto a slightly drier mid-level air mass. Thus, a weakening trend is \nshown at that time.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  21/2100Z  9.4N  99.8W   35 KT  40 MPH\n 12H  22/0600Z  9.5N 100.5W   45 KT  50 MPH\n 24H  22/1800Z  9.8N 101.3W   60 KT  70 MPH\n 36H  23/0600Z 10.4N 102.1W   80 KT  90 MPH\n 48H  23/1800Z 11.2N 102.7W   95 KT 110 MPH\n 60H  24/0600Z 11.9N 103.1W  105 KT 120 MPH\n 72H  24/1800Z 12.8N 103.5W  100 KT 115 MPH\n 96H  25/1800Z 14.5N 104.3W   90 KT 105 MPH\n120H  26/1800Z 15.8N 105.2W   85 KT 100 MPH\n \n"}