{"id": "1221403326748426242", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-24T03:00:00Z", "msg": "378\nWTPZ42 KNHC 240338\nTCDEP2\n \nHurricane Vance Discussion Number  11\nNWS National Hurricane Center Miami FL       EP222026\n900 PM CST Fri Oct 23 2026\n \nCorrection: Updated to emphasize that Vance briefly reached major \nhurricane intensity earlier this evening before weakening to \nCategory 2 strength.\n \nSatellite imagery indicates that Vance became better organized \nearlier this evening, with cloud-top temperatures cooling and deep \nconvection expanding around a warming eye. However, the eye has \nbecome less distinct during the past hour or two, with some warming \nof the cloud tops in the eyewall, possibly due to moderate southerly \nvertical wind shear. The subjective Dvorak intensity estimate from \nTAFB was T5.5/102 kt, although recent objective intensity estimates \nhave trended downward toward 95 kt. Vance briefly reached major \nhurricane intensity earlier this evening before the recent \ndeterioration in its satellite presentation. Given the recent \ndegradation in satellite presentation and the latest objective \nestimates, the initial intensity is set at 95 kt.\n \nVance is moving north-northwestward, or 345/6 kt. This general \nmotion is expected to continue during the next couple of days as a \nbroad mid- to upper-level trough evolves over the western portion of \nthe United States, weakening the subtropical ridge over Mexico. \nAlthough the track guidance remains in relatively good agreement \nthrough 24 to 36 h, forecast confidence decreases thereafter as the \ntrough shifts eastward and Vance enters a region of weaker steering \ncurrents. Significant cross-track spread persists among the guidance \nsolutions, partly due to differences in how well Vance maintains its \nvertical structure as increasing shear affects the cyclone. A \nweaker, more vertically tilted system could be steered farther \nwestward, while a stronger, vertically coupled hurricane would be \nmore likely to continue northward toward the southwestern or \nwest-central coast of Mexico. Given these persistent differences, \nthe NHC track forecast remains largely unchanged from the previous, \nlying close to the HCCA and GDMI aids.\n \nVance may have reached its peak intensity earlier this evening after\nrapidly intensifying from 60 to 100 kt over the preceding 24 h.\nAlthough some additional strengthening is possible in the short\nterm, recent satellite trends suggest that the hurricane may be\nbeginning to feel the effects of a less favorable environment.\nCooler sea surface temperatures associated with the wakes of recent\ntropical cyclones have reduced the ocean heat content along portions\nof Vance's forecast track. These cooler waters, combined with\nincreasing vertical wind shear, should contribute to a weakening\ntrend during the next day or two. However, the magnitude of\nweakening remains uncertain and will depend partly on how long Vance\nremains over the cooler waters. The aforementioned differences in\nthe track guidance have also contributed to considerable spread\namong the intensity solutions, with the possibility of more\nsubstantial weakening than currently forecast. Vance could move\nbeyond the cooler waters after 48 h, allowing for some\nrestrengthening. Thereafter, increasing vertical wind shear,\ndecreasing mid-level moisture, and possible land interaction should\nlead to another weakening trend late in the forecast period. The NHC\nintensity forecast remains similar to the previous prediction and\nlies near the upper end of the guidance envelope through much of the\nforecast period.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  24/0300Z 12.0N 102.6W   95 KT 110 MPH\n 12H  24/1200Z 12.8N 102.8W  105 KT 120 MPH\n 24H  25/0000Z 13.8N 103.1W  100 KT 115 MPH\n 36H  25/1200Z 14.8N 103.4W   90 KT 105 MPH\n 48H  26/0000Z 15.8N 103.8W   85 KT 100 MPH\n 60H  26/1200Z 16.3N 104.0W   90 KT 105 MPH\n 72H  27/0000Z 16.8N 104.2W   95 KT 110 MPH\n 96H  28/0000Z 17.6N 104.3W   85 KT 100 MPH\n120H  29/0000Z 18.4N 104.4W   70 KT  80 MPH\n \n"}