Tropical Cyclone Discussion
050 WTPZ42 KNHC 230239 TCDEP2 Tropical Storm Vance Discussion Number 7 NWS National Hurricane Center Miami FL EP222026 900 PM CST Thu Oct 22 2026 Satellite imagery indicates that Vance continues to become better organized, with an expanding Central Dense Overcast, a well-defined curved convective band wrapping into the circulation from the south, and cloud-top temperatures as cold as -85 C. Upper-level outflow remains well established, and recent microwave imagery reveals an improvement in the inner-core structure compared to several hours ago. The latest subjective Dvorak intensity estimate from TAFB was T4.0/65 kt, in good agreement with UW-CIMSS objective estimates ranging from 55 to 65 kt. Given these estimates and the continued improvement in satellite presentation, the initial intensity is raised to a conservative 60 kt. Vance has turned northwestward, and the initial motion is estimated at 325/5 kt. The cyclone should continue moving northwestward along the southwestern periphery of a mid-level ridge extending over Mexico into early Friday. A gradual turn toward the north-northwest is expected during the next couple of days as the ridge weakens in response to an upper-level trough over the southwestern United States. The latest track guidance remains in good agreement through about 60 h. Thereafter, the trough is expected to shift eastward, leaving Vance in a region of weaker steering currents and resulting in increasing spread among the guidance solutions. The regional hurricane models and GFS favor a more westward track away from the coast between days 4 and 5, while the GDMI, HCCA, TVCN, and ECMWF maintain a more north-northwestward track toward the southwestern and west-central coast of Mexico. Given these persistent differences in the extended guidance, the NHC track forecast is largely unchanged from the previous prediction and remains close to the GDMI and HCCA aids. Environmental conditions are expected to remain favorable for significant strengthening during the next couple of days, characterized by warm sea surface temperatures, low vertical wind shear, and plenty of mid-level moisture. Guidance continues to indicate a high likelihood of rapid intensification (RI), with probabilities from the GFS- and ECMWF-based statistical guidance reaching 65 to 80 percent during the next 24 h, well above climatological values. Accordingly, the NHC intensity forecast explicitly calls for RI during the next 24 h, with Vance forecast to become a major hurricane by early Saturday. Thereafter, the cyclone could encounter relatively cooler waters, potentially influenced by upwelling associated with recent tropical cyclones, along with increasing vertical wind shear. These factors should limit further strengthening and support gradual weakening beginning around 60 h. The NHC intensity forecast is similar to the previous prediction and remains near the upper end of the guidance envelope through much of the forecast period. FORECAST POSITIONS AND MAX WINDS INIT 23/0300Z 10.5N 101.9W 60 KT 70 MPH 12H 23/1200Z 10.9N 102.2W 80 KT 90 MPH 24H 24/0000Z 11.7N 102.8W 95 KT 110 MPH 36H 24/1200Z 12.5N 103.1W 105 KT 120 MPH 48H 25/0000Z 13.6N 103.5W 100 KT 115 MPH 60H 25/1200Z 14.7N 103.8W 95 KT 110 MPH 72H 26/0000Z 15.7N 104.1W 90 KT 105 MPH 96H 27/0000Z 16.7N 104.4W 90 KT 105 MPH 120H 28/0000Z 17.3N 104.6W 85 KT 100 MPH