{"id": "1212402357535965191", "title": "Tropical Cyclone Discussion", "adv_date": "2026-09-22T09:00:00Z", "msg": "029\nWTPZ42 KNHC 220837\nTCDEP2\n \nHurricane Polo Discussion Number   7\nNWS National Hurricane Center Miami FL       EP172026\n300 AM CST Tue Sep 22 2026\n \nPolo continues to intensify at a very rapid rate, and it is closing \nin on category 5 strength. Satellite images indicate that Polo has a \ncompact, well-defined eye surrounded by an intense eyewall. The \nestimated initial intensity is 130 kt, which is based on a blend of \nthe latest subjective and objective satellite estimates. The NOAA \nHurricane Hunters are scheduled to investigate Polo later today, and \nthe data they collect will provide a better estimate of the \ncyclone's intensity. The intensification rate over the past 24 hours \nis truly remarkable, with Polo strengthening by about 90 kt over \nthat time period. Despite its strength, Polo remains a relatively \ncompact cyclone with its hurricane and tropical-storm-force winds \nestimated to only extend about 30 and 80 n mi from the eye, \nrespectively.\n \nThe major hurricane continues to drift to the east-southeast, and it \ncould become nearly stationary later today in weak steering \ncurrents. A sharp turn to the northwest is expected tonight as \ndeep-layer ridging becomes established over Mexico and the \nsouth-central U.S. This pattern should bring the intense core of \nPolo near, but likely just offshore, of the coast of southwestern \nMexico during the next couple of days. There is still a considerable \namount of uncertainty in how close the hurricane will get to the \ncoast, and some wind, rain, and surf impacts appear likely when Polo \nmakes its closest approach. Polo should begin to pull away from \nsouthwestern Mexico Thursday night and Friday as the ridge keeps the \nsystem on a west-northwestward to northwestward path. The steering \ncurrents become more complicated over the weekend when Polo reaches \nthe western edge of the ridge and nears Tropical Storm Odalys to its \nwest. This pattern change should cause Polo to slow down and gain a \nlittle more latitude. The NHC track forecast has been nudged \nsouthward, but still lies on the northern side of the guidance \nenvelope.\n \nPolo remains in ideal environmental conditions and continued rapid \nintensification appears likely, and the cyclone is forecast to reach \ncategory 5 strength later today. It should be noted that in mature \nand powerful hurricanes like Polo, internal dynamics often cause \nintensity fluctuations and that could occur with this cyclone over \nthe next couple of days. Beyond that time, a slight increase in \neasterly vertical wind shear should cause slow weakening, but Polo \nis expected to remain a major hurricane throughout the forecast \nperiod. The NHC intensity forecast lies at the high end of the model \nguidance in the short term, but falls to near the middle of the \nguidance envelope from 48 to 120 hours.\n \nKey Messages:\n \n1. Heavy rainfall associated with Polo will impact coastal portions\nof southwest Mexico through Thursday. This rainfall may produce\nlife-threatening flooding and mudslides, especially in areas of\nsteep terrain.\n \n2. Although the core of the hurricane is forecast to remain offshore \nof southwestern Mexico, it is too soon to determine the exact \nlocation and magnitude of impacts. A Tropical Storm Watch is in \neffect for portions of southwestern Mexico, and interests in these \nareas should closely monitor updates to the forecast.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  22/0900Z 14.6N 101.8W  130 KT 150 MPH\n 12H  22/1800Z 14.6N 101.6W  150 KT 175 MPH\n 24H  23/0600Z 15.0N 101.8W  145 KT 165 MPH\n 36H  23/1800Z 15.7N 102.5W  140 KT 160 MPH\n 48H  24/0600Z 16.4N 103.7W  135 KT 155 MPH\n 60H  24/1800Z 17.0N 105.2W  130 KT 150 MPH\n 72H  25/0600Z 17.4N 106.8W  125 KT 145 MPH\n 96H  26/0600Z 18.2N 109.7W  115 KT 130 MPH\n120H  27/0600Z 20.1N 112.1W  105 KT 120 MPH\n \n"}