Tropical Cyclone Discussion
443 WTPZ41 KNHC 150234 TCDEP1 Tropical Storm Trudy Discussion Number 7 NWS National Hurricane Center Miami FL EP212026 900 PM CST Wed Oct 14 2026 Satellite imagery indicates that Trudy has become better organized over the past several hours, with an expanding central dense overcast and a fragmented convective band wrapping around the northern portion of the circulation. A 2305 UTC GMI microwave image also revealed improving inner-core organization, with a curved convective band beginning to wrap around the center. The latest subjective Dvorak intensity estimate from TAFB was T4.0/65 kt, while objective estimates have generally been in the 50 to 60 kt range. Based on these estimates and the improving satellite presentation, the initial intensity is increased to 60 kt. The initial motion is west-northwestward, or 310/7 kt. This general motion is expected to continue into Thursday as Trudy moves along the southern periphery of a mid-level ridge extending across central Mexico. Thereafter, a gradual turn toward the north-northwest and possibly north is anticipated as the ridge weakens in response to an amplifying mid- to upper-level trough over the Gulf of America. This steering pattern is expected to bring Trudy very close to the coast of southwestern and west-central Mexico this weekend. Between 72 and 96 h, Trudy is forecast to move northwestward roughly parallel to the coast from near Manzanillo to Cabo Corrientes, before turning west-northwestward away from the coast early next week as the ridge begins to build back to the north. Some interaction with Tropical Storm Simon, a compact tropical cyclone located several hundred miles to the northwest, could further complicate the steering pattern. Considerable track uncertainty remains, particularly during days 4 and 5, when the guidance exhibits a significant amount of cross-track spread. The latest NHC track forecast is very close to the previous prediction through 96 h, but is farther north at day 5 as Trudy turns west-northwestward away from the coast of Mexico. The forecast lies close to the HCCA and GDMI consensus aids. Environmental conditions appear favorable for significant strengthening during the next couple of days, with low vertical wind shear, warm sea surface temperatures, and a plenty of deep moisture surrounding Trudy. The improving inner-core organization noted in recent microwave imagery also suggests that Trudy could be poised to undergo a period of rapid intensification. In fact, the latest SHIPS rapid intensification guidance indicates a strong likelihood of a 30-kt increase in maximum winds during the next 24 h, more than four times the climatological mean. Although Trudy could briefly encounter lower ocean heat content associated with the wakes of previous tropical cyclones, oceanic conditions are forecast to become more favorable thereafter. The NHC intensity forecast calls for rapid intensification during the next 24 h, followed by additional strengthening to major hurricane intensity by Friday. Beyond 60 h, increasing southwesterly vertical wind shear and the entrainment of drier mid-level air are expected to induce weakening. The NHC intensity forecast remains above the guidance envelope during the next few days, then lies near the upper end of the guidance envelope thereafter. Trudy is forecast to approach the coast of southwestern and west-central Mexico as a major hurricane this weekend. Given the uncertainty in the track forecast and the potential for significant impacts, interests along the coast of southwestern and west-central Mexico should closely monitor the progress of Trudy and be prepared to implement their hurricane plans. Key Messages: 1. Trudy is forecast to be a major hurricane as it approaches the coast of southwestern and west-central Mexico late this week and into the weekend. There is an increasing risk of wind, rain, and storm surge impacts, and watches could be required for a portion of these areas by early Thursday. 2. Heavy rainfall associated with Trudy will impact the southwest Mexican coast between Guerrero and Jalisco through the weekend. This rainfall may produce life-threatening flooding and mudslides by the weekend across Colima and Jalisco, especially in areas along steep terrain. 3. Large swells will begin to affect portions of the coast of southwestern Mexico late this week and continue through the weekend. These swells could cause life-threatening surf and rip current conditions. FORECAST POSITIONS AND MAX WINDS INIT 15/0300Z 12.4N 100.8W 60 KT 70 MPH 12H 15/1200Z 12.9N 101.3W 75 KT 85 MPH 24H 16/0000Z 13.6N 101.8W 90 KT 105 MPH 36H 16/1200Z 14.5N 102.1W 100 KT 115 MPH 48H 17/0000Z 15.3N 102.5W 110 KT 125 MPH 60H 17/1200Z 16.4N 103.2W 115 KT 130 MPH 72H 18/0000Z 17.6N 104.3W 105 KT 120 MPH 96H 19/0000Z 19.7N 106.4W 80 KT 90 MPH 120H 20/0000Z 20.1N 107.7W 60 KT 70 MPH