{"id": "1221462315836211202", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-24T09:00:00Z", "msg": "673\nWTPZ42 KNHC 240838\nTCDEP2\n \nHurricane Vance Discussion Number  12\nNWS National Hurricane Center Miami FL       EP222026\n300 AM CST Sat Oct 24 2026\n \nSatellite imagery indicates that Vance's convective structure has \nchanged little during the past several hours. The eye remains ragged \nand intermittently obscured by clouds, surrounded by deep convection \nwithin the eyewall where cloud-top temperatures are around -75 C. \nRecent microwave imagery revealed a slight northward tilt of the \nvortex, reflecting the persistent moderate southerly vertical wind \nshear. A 0353 UTC Metop-C scatterometer pass helped refine the \nanalyzed wind radii. Subjective Dvorak and objective intensity \nestimates remain in the 90 to 100 kt range. Given these estimates \nand the relatively steady satellite presentation, the initial \nintensity is held at 95 kt.\n \nThe initial motion is north-northwestward, or 335/6 kt. This general \nmotion should continue through tonight as the subtropical ridge \nweakens in response to a broad mid- to upper-level trough near the \nWest Coast of the United States. The track guidance remains in good \nagreement through tonight, but Vance's forward speed is expected to \ndecrease as it enters a region of weak steering currents. \nConsiderable cross-track spread develops among the guidance \nsolutions beginning around 36 h, partly due to differences in how \nwell Vance maintains its vertical structure as increasing shear and \ncooler waters affect the cyclone. A weaker system could be steered \nmore west-northwestward, while a stronger hurricane would be more \nlikely to continue northward. Given the substantial spread, even \nbetween the HCCA and GDMI aids after day 3, track forecast \nconfidence remains quite low as Vance approaches the vicinity of the \nsouthwestern and west-central coast of Mexico next week. The NHC \ntrack forecast remains largely unchanged from the previous \nprediction, lying near the HCCA and GDMI aids through day 3 and \nrepresenting an average of these two solutions thereafter.\n\nVance's intensity appears to have leveled off during the past \nseveral hours after the hurricane underwent a period of rapid \nintensification on Friday. Although some fluctuations in strength \nremain possible today, cooler sea surface temperatures associated \nwith the wakes of recent tropical cyclones have reduced the ocean \nheat content along portions of Vance's forecast track. These cooler \nwaters, combined with increasing vertical wind shear, should induce \na weakening trend beginning tonight and continuing through Sunday. \nThe aforementioned differences in the track guidance have also \ncontributed to considerable spread among the intensity solutions, \nwith the possibility of more substantial weakening than currently \nforecast. Vance could move beyond the cooler waters by 48 h, \nallowing for a brief period of restrengthening by 60 h. Thereafter, \nincreasing vertical wind shear, decreasing mid-level moisture, and \npossible land interaction should lead to another weakening trend \nlate in the forecast period. The NHC intensity forecast remains \nsimilar to the previous prediction and lies near the upper end of \nthe guidance envelope through much of the forecast period.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  24/0900Z 12.4N 102.8W   95 KT 110 MPH\n 12H  24/1800Z 13.1N 103.1W   95 KT 110 MPH\n 24H  25/0600Z 14.3N 103.4W   90 KT 105 MPH\n 36H  25/1800Z 15.2N 103.7W   85 KT 100 MPH\n 48H  26/0600Z 15.9N 104.1W   85 KT 100 MPH\n 60H  26/1800Z 16.2N 104.2W   90 KT 105 MPH\n 72H  27/0600Z 16.6N 104.3W   85 KT 100 MPH\n 96H  28/0600Z 17.5N 104.4W   70 KT  80 MPH\n120H  29/0600Z 18.5N 104.5W   60 KT  70 MPH\n \n"}