{"id": "1218988901699158019", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-15T15:00:00Z", "msg": "249\nWTPZ41 KNHC 151458\nTCDEP1\n \nHurricane Trudy Discussion Number   9\nNWS National Hurricane Center Miami FL       EP212026\n900 AM CST Thu Oct 15 2026\n \nTrudy appears to be undergoing a period of rapid intensification.\nAfter the previous advisory, there were several microwave images\nthat showed the hurricane has developed an eyewall, with a cyan ring\nnoted on the 37 GHz channel of the 1037 UTC GMI and more recent 1250\nUTC WSF-M pass. This signature is often a harbinger or indicates\nthat rapid intensification is underway. On geostationary satellite\nTrudy has been maintaining a healthy central dense overcast with\ncold cloud tops between -75 to -80 C with new bursts of convection\nfully wrapping around the circulation as it becomes more symmetric.\nThe subjective Dvorak estimate at 12 UTC was T4.5/77 kt, but given\nthe improving structure seen on microwave imagery, the initial\nintensity is being set at 80 kt this advisory, which is on the high\nend of the intensity estimates. This indicates that Trudy has\nintensified 30 kt in the past 24 h, qualifying as rapid\nintensification. An Air Force Reserve Hurricane Hunter aircraft is\nen route to sample the hurricane and should provide critial in-situ\ndata to help refine the forecast this afternoon.\n \nTrudy is now estimated to be moving slowly north-northwestward, or\n335 degrees at 5 kt. Over the next 24-36 h Trudy is expected to\nmaintain this heading but at a slow pace as its steering is\nmaintained by two ridges, one to its east and another to its north.\nThese features are split by a mid- to upper-level trough that is\ndraped across the Yucatan Peninsula, weakening the overall\nsteering flow. How these synoptic features interact over the next\nseveral days is leading to a lot of track uncertainty over the next\nfew days, and there are some track solutions (GFS, ECMWF) that show\nTrudy making landfall. The latest NHC track forecast has been\nshifted eastward compared to the prior one, following the trends in\nthe guidance. This track is blending the latest HFIP Corrected\nConsensus Approach (HCCA), Google DeepMind ensemble mean (GDMI) and\nalso places a little weight on the latest ECMWF track forecast.\nWith that said, given the spread of the deterministic and ensemble\ntrack guidance this cycle, this forecast is lower confidence than\nusual.\n \nNow that Trudy has developed an inner-core, intensification is\nlikely to be rapid in the short-term. Environmental conditions are\nquite favorable (shear under 10 kt, sea-surface temperatures 28-29\nC, and abundant moisture) and SHIPS-RI indices are elevated for a\n30-40 kt increase in intensity over the next 24 h. Thus, the first\npart of this intensity forecast was raised from the previous\nadvisory, showing Trudy becoming a major hurricane in 12-24 h, and\npeaking as a 125 kt Category 4 hurricane in 36 h. This part of the\nintensity forecast is on the upper end of the guidance. Thereafter,\nboth the GFS and ECMWF based SHIPS guidance shows southwesterly\nvertical wind shear increasing markedly, and this will also be the\nperiod where Trudy nears the coast of Mexico, where terrain-induced\neffects will likely start to affect the circulation. These combined\neffects are now forecast to lead to weakening beginning in 48 h and\ncontinuing through the rest of the forecast. One big caveat with\nthis intensity forecast is just how close Trudy gets to Mexico. A\ntrack closer to the coast may result in much more weakening than\nshown here, while a track further offshore may preserve Trudy's\nintensity, similar to what we saw with Simon earlier this week. The\nsecond part of the NHC intensity forecast falls back closer to the\nguidance mean. Given the proximity of Trudy's track to Mexico, this\nis also a lower confidence intensity forecast after the next 48 h.\n \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. There is\nan increasing risk of wind, rain, and storm surge impacts. A\nTropical Storm Watch has now been issued for a portion of the\nsouthwestern Mexican coast, and additional watches will likely be\nrequired further up the coast later today.\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 across Colima and Jalisco, especially in areas along steep\nterrain.\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  15/1500Z 13.1N 101.6W   80 KT  90 MPH\n 12H  16/0000Z 13.6N 101.9W   95 KT 110 MPH\n 24H  16/1200Z 14.6N 102.2W  115 KT 130 MPH\n 36H  17/0000Z 15.5N 102.5W  125 KT 145 MPH\n 48H  17/1200Z 16.7N 103.4W  120 KT 140 MPH\n 60H  18/0000Z 18.0N 104.3W  105 KT 120 MPH\n 72H  18/1200Z 19.4N 105.4W   90 KT 105 MPH\n 96H  19/1200Z 20.2N 107.4W   55 KT  65 MPH\n120H  20/1200Z 20.3N 108.4W   50 KT  60 MPH\n \n"}