{"id": "1217219584048726023", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-09T09:00:00Z", "msg": "963\nWTNT44 KNHC 090858\nTCDAT4\n \nHurricane Isaias Discussion Number  11\nNWS National Hurricane Center Miami FL       AL092026\n400 AM CDT Fri Oct 09 2026\n \nIsaias has intensified overnight. NOAA and Air Force Reserve \nHurricane Hunter data showed that the maximum flight-level winds \nhave increased up to 107 kt, with a better-defined eye and a \nshrinking eyewall. These changes are also present on satellite \nimagery, with a more symmetric presentation along with a warming \neye/cooling eyewall. The available data suggest a current intensity \nof 95 kt for this advisory.\n \nIsaias will likely become a major hurricane soon with the improving \nsatellite imagery, and it could continue to intensify for the next \n12 hours or so while it moves over very warm and deep water. \nHowever, a large increase in shear is anticipated before landfall, \nwhich will probably cause some weakening to occur. This is a tenuous \nspot because it would only take about a 6h delay in the onset of the \nshear to bring a stronger hurricane than expected onshore. The new \nforecast explicitly is a bit higher than the last one, but our best \nforecast at this time is for a high-end category 2 intensity at \nlandfall, which is about the same as before.  Regardless of its \nexact wind speed at landfall, Isaias will be a dangerous hurricane \nwith significant storm surge, damaging winds, and flooding rains. \nThe wind field is also predicted to grow due to a trough \ninteraction, and some of these impacts will extend well away from \nthe center. After landfall, gusty winds are expected to reach well \ninland over portions of the southeastern United States.\n \nIsaias has turned towards the north-northeast (020/13 kt), and\nthe hurricane is expected to turn northward and accelerate later\ntoday due to increasing flow between an upper trough near the\nnorthwestern Gulf Coast and a subtropical ridge extending across\nthe western Atlantic. Landfall is expected to occur within the\nhurricane warning area Friday night or early Saturday.  The new\nforecast is almost the same as before, very near the Google DeepMind\nguidance, which has been very accurate for Isaias.\n \nKey Messages:\n \n1. A life-threatening storm surge is expected from the Mouth of the\nMississippi River to Suwannee, Florida. Residents in the warning\narea should follow advice given by local officials and evacuate\nimmediately if told to do so.\n \n2. Damaging hurricane force-winds are expected over portions of the\nFlorida Panhandle, southern Alabama, and southern Mississippi where\na Hurricane Warning is in effect. Residents in these areas should\nprepare for the possibility of long-duration power outages.\n \n3. Damaging wind gusts are possible over much of central and\nnorthern Alabama, extreme eastern Mississippi, and portions of\nwestern and northern Georgia, especially in areas of higher terrain.\nAdditional Tropical Storm and High Wind Watches and Warnings may be\nrequired for portions of that area later today. Residents should\nsecure loose outdoor items, avoid driving high-profile vehicles,\nand prepare for power outages.\n \n4. Isaias will bring areas of heavy rainfall to the central U.S.\nGulf coast and much of the Southeast through the weekend.\nConsiderable flash and urban flooding, along with significant river\nflooding, will be possible.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  09/0900Z 26.4N  88.0W   95 KT 110 MPH\n 12H  09/1800Z 28.4N  87.3W  105 KT 120 MPH\n 24H  10/0600Z 31.0N  87.1W   65 KT  75 MPH...INLAND\n 36H  10/1800Z 33.5N  87.5W   35 KT  40 MPH...POST-TROP/INLAND\n 48H  11/0600Z 35.5N  86.7W   25 KT  30 MPH...POST-TROP/INLAND\n 60H  11/1800Z 38.2N  83.1W   15 KT  15 MPH...POST-TROP/INLAND\n 72H  12/0600Z...DISSIPATED\n \n"}