{"id": "1217078310571114503", "title": "Tropical Cyclone Discussion", "adv_date": "2026-10-08T21:00:00Z", "msg": "823\nWTNT44 KNHC 082100\nTCDAT4\n \nHurricane Isaias Discussion Number   9\nNWS National Hurricane Center Miami FL       AL092026\n400 PM CDT Thu Oct 08 2026\n \nThe eye of Isaias has become apparent on visible and infrared\nsatellite imagery.  Interestingly, this is the first eye noted on\nsatellite pictures in the Atlantic basin during the 2026 Hurricane\nSeason.  The cloud tops have mostly warmed in the system, but the\nlatest subjective Dvorak classification value from TAFB has\nincreased to T4.5 or 77 kt.  NOAA Hurricane Hunter aircraft\nobservations do not indicate a drop in central pressure so far and\nthe peak 700-mb flight-level winds have not increased.  However,\nTail Doppler Radar wind velocities from the aircraft measured just\nabove the surface support increasing the intensity to 85 kt for\nthis advisory.\n \nSatellite and aircraft center fixes indicate that the hurricane \nappears to have made its expected turn toward the northeast and the \ninitial motion is now 050/10 kt.  Isaias is expected to turn \nnorthward tomorrow and move between a mid-level ridge extending \nwestward from the Bahamas to the Florida peninsula and a trough \nnear the northwest Gulf Coast.  On the forecast track, the center \nwill move inland along the northern Gulf coast within the next 36 \nhours, and then pass over portions of the southeastern U.S. during \nthe next few days.  The official forecast is nudged slightly \neastward and follows the latest corrected consensus model guidance. \n \nThe intensity forecast remains somewhat problematic.  The hurricane \nwill be passing over Gulf waters of high oceanic heat content \nduring the next day or so.  In fact, the projected track of Isais \nshows it passing near a warm eddy overnight.  However, the vertical \nwind shear, which is already significant, is expected to increase \nsubstantially during the next 36 hours. The current thinking is that \nthe shear will not offset the conducive oceanic conditions until \n12-24 hours, so further strengthening is anticipated overnight.  The \nofficial intensity forecast is at the high end of the model \nguidance, but in consideration of the expected stronger wind shear \nin 24-36 hours, some decrease in intensity is indicated as Isaias \napproaches the coast.  Regardless, Isaias is expected to remain a \ndangerous hurricane through landfall, and strong gusty winds are \nexpected well inland after the center crosses the coast.\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. \n Additional Tropical Storm and High Wind Watches and Warnings may be \nrequired for portions of that area later tonight. Residents should \nsecure loose outdoor items, avoid driving high-profile vehicles, and \nprepare for power outages.\n\n4. Isaias will bring areas of heavy rainfall to the central U.S.\nGulf coast and much of the Southeast Friday into the weekend.\nConsiderable flash and urban flooding, along with significant river\nflooding, will be possible.\n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  08/2100Z 24.4N  89.3W   85 KT 100 MPH\n 12H  09/0600Z 25.7N  88.4W   95 KT 110 MPH\n 24H  09/1800Z 28.2N  87.4W   85 KT 100 MPH\n 36H  10/0600Z 31.0N  87.2W   65 KT  75 MPH...INLAND\n 48H  10/1800Z 33.2N  87.8W   30 KT  35 MPH...INLAND\n 60H  11/0600Z 35.0N  87.8W   25 KT  30 MPH...POST-TROP/INLAND\n 72H  11/1800Z 37.0N  85.0W   20 KT  25 MPH...POST-TROP/INLAND\n 96H  12/1800Z...DISSIPATED\n \n"}