{"id": "1205610474602004483", "title": "Tropical Cyclone Discussion", "adv_date": "2026-08-29T09:00:00Z", "msg": "955\nWTPZ42 KNHC 290851\nTCDEP2\n \nTropical Storm Lowell Discussion Number   7\nNWS National Hurricane Center Miami FL       EP122026\n1100 PM HST Fri Aug 28 2026\n \nThere has been little change in Lowell's organization or intensity \nduring the past several hours. Moderate easterly vertical wind shear \ncontinues to displace the bulk of the deep convection over and west \nof the low-level circulation center. While an earlier scatterometer \npass showed slightly lower winds, a blend of the latest objective \nintensity estimates and the subjective Dvorak intensity estimate \nfrom TAFB supports holding the initial intensity at 40 kt for this \nadvisory.\n\nThe cyclone continues to move slowly westward, with an initial \nmotion of about 280/7 kt. A low- to mid-level ridge is forecast to \nstrengthen north of the cyclone during the next couple of days, \nwhich should cause Lowell to continue westward with a gradual \nincrease in forward speed. This general westward motion is expected \nto continue through the weekend and into early next week. Track \nforecast uncertainty increases considerably thereafter due in part \nto the potential influence of Tropical Storm Karina to the northeast \non Lowell's steering flow. There remains considerable spread in the \nguidance, particularly in forward speed, with the multi-model \nconsensus (HCCA) and Google DeepMind ensemble mean generally faster \nthan the GFS and ECMWF solutions. In addition to the along-track \nspread, the cross-track spread also increases considerably by day 5. \nGiven these differences, the latest NHC track forecast has been \nnudged slightly southward and reflects a blend of the previous \nforecast and the latest HCCA and Google DeepMind ensemble mean.\n\nThe easterly vertical wind shear currently affecting Lowell is \nforecast to persist into the weekend, then steadily decrease by \nSunday night into Monday, which should allow the cyclone to become \nbetter organized and gradually strengthen. However, the current \nsheared structure and nearby mid- to upper-level dry air should \ntemper the rate of intensification in the short term. Environmental \nconditions are forecast to become more favorable thereafter, and a \nfaster rate of strengthening is possible by early next week. The \nintensity forecast becomes more uncertain later in the period due to \nLowell's potential interaction with Karina. A faster westward track \nwould likely keep the cyclones sufficiently separated and allow \nLowell to continue strengthening, while a slower solution could \nexpose Lowell to stronger shear associated with outflow from Karina. \nThe latest NHC intensity forecast is essentially unchanged from the \nprevious advisory and lies near the middle of the guidance envelope.\n \n \nFORECAST POSITIONS AND MAX WINDS\n \nINIT  29/0900Z 12.6N 134.8W   40 KT  45 MPH\n 12H  29/1800Z 12.8N 136.3W   45 KT  50 MPH\n 24H  30/0600Z 12.9N 139.0W   50 KT  60 MPH\n 36H  30/1800Z 13.0N 141.3W   50 KT  60 MPH\n 48H  31/0600Z 13.0N 143.4W   55 KT  65 MPH\n 60H  31/1800Z 13.1N 145.0W   65 KT  75 MPH\n 72H  01/0600Z 13.3N 146.8W   75 KT  85 MPH\n 96H  02/0600Z 13.6N 149.0W   90 KT 105 MPH\n120H  03/0600Z 13.9N 151.6W   95 KT 110 MPH\n \n"}