{"id": "1219128314165559298", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-16T03:00:00Z", "msg": "658\nWTPZ41 KNHC 160247\nTCDEP1\n \nHurricane Trudy Discussion Number  11\nNWS National Hurricane Center Miami FL       EP212026\n900 PM CST Thu Oct 15 2026\n \nThe latest satellite imagery of Trudy continues to show a core of \ndeep convection with cloud tops near -80C, particularly on the \nwestern side of the circulation. During the past few hours, an eye \nfeature has become apparent on infrared and proxy-vis imagery. \nUnfortunately, there have not been any recent microwave passes to \nprovide a better assessment of the core structure since the Air \nForce Hurricane Hunters departed earlier this afternoon. The latest \nsubjective Dvorak satellite intensity estimate from TAFB is T5.0/90 \nkt, while UW-CIMSS objective intensity estimates have a fairly large \nspread of 65-81 kt. Given the improved satellite presentation since \nthe previous advisory, with an eye-like feature, and the TAFB \nclassification, the initial intensity is raised to 90 kt.\n \nThe initial motion is north-northwestward, or 345/6 kt. Trudy is \nmoving generally north-northwestward into a weakness in the \nsubtropical ridge caused by an upper-level trough over the Yucatan \nPeninsula. As the trough moves eastward, the ridge is forecast to \nbuild over central Mexico, steering Trudy northwestward to \nnorth-northwestward along its western periphery and roughly parallel \nto the coast of southwestern and west-central Mexico. Most of the \ntrack guidance keeps the center just offshore, with the exception of \nthe GFS, which brings the center inland. After 72 h, a mid-level \nridge to the north of the system is expected to build, turning Trudy \nmore westward. The latest NHC track forecast is very similar to the \nprevious advisory through 60 h, but has been adjusted slightly north \nthereafter, leaning toward the HCCA and GDMI aids.\n \nEnvironmental conditions are favorable for steady to rapid \nintensification during the next day or so. Sea surface temperatures \nare near 29-30C, combined with low vertical wind shear and abundant \nmid-level moisture. The NHC peak intensity forecast still remains at \n125 kt, which is above all the intensity guidance. The SHIPS Rapid \nIntensification (RI) index still shows a 20 to 30 percent chance of \nRI over the next 24 h, and the NHC forecast explicitly reflects RI \nduring that time frame. After 36-48 h, increasing southwesterly wind \nshear, potential internal structural changes, such as eyewall \nreplacement cycles, and land interaction will begin to disrupt the \ncirculation, inducing a weakening trend. Regardless, Trudy is \nforecast to be a powerful major hurricane as it nears west-central \nMexico. It is worth noting that the intensity forecast is highly \nsensitive to the exact track. A track farther to the left and \noffshore would allow Trudy to remain stronger than currently \nforecast, while a track that brings the center inland would result \nin rapid weakening. Beyond 72 h, strong shear should cause continued \nweakening, even though the system will have less land interaction as \nit moves farther offshore. The NHC intensity forecast lies near the \nupper end of the guidance initially, then trends toward the HCCA \ncorrected consensus by the end of the forecast period.\n   \nKEY MESSAGES:\n \n1. Trudy is forecast to be a major hurricane as it approaches the \ncoast of southwestern and west-central Mexico this weekend, bringing \nan increasing risk of storm surge, damaging winds, and flooding \nrain. Hurricane Watches and Tropical Storm Warnings are currently in \neffect for portions of the coast, and additional watches and \nwarnings will likely be required on Friday.\n \n2. Heavy rainfall associated with Trudy will impact the southwest \nMexican coast between Guerrero and Jalisco through the weekend. This \nrainfall may produce life-threatening flooding and mudslides by the \nweekend along and near the southwest Mexican coast in Michoac\u00e1n, \nColima, and Jalisco, especially in areas along steep terrain.\n \n3. Large swells will begin to affect portions of the coast of\nsouthwestern Mexico Friday and continue through the weekend. These\nswells could cause life-threatening surf and rip current conditions.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  16/0300Z 14.3N 102.1W   90 KT 105 MPH\n 12H  16/1200Z 15.0N 102.3W  105 KT 120 MPH\n 24H  17/0000Z 15.9N 102.8W  120 KT 140 MPH\n 36H  17/1200Z 17.1N 103.7W  125 KT 145 MPH\n 48H  18/0000Z 18.4N 104.8W  115 KT 130 MPH\n 60H  18/1200Z 19.7N 105.7W  100 KT 115 MPH\n 72H  19/0000Z 20.7N 106.4W   85 KT 100 MPH\n 96H  20/0000Z 21.0N 107.6W   55 KT  65 MPH\n120H  21/0000Z 21.3N 108.8W   50 KT  60 MPH\n \n"}