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Tropical Depression NINE Forecast Discussion Number 4
2016-08-29 16:44:02| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT MON AUG 29 2016 000 WTNT44 KNHC 291443 TCDAT4 TROPICAL DEPRESSION NINE DISCUSSION NUMBER 4 NWS NATIONAL HURRICANE CENTER MIAMI FL AL092016 1100 AM EDT MON AUG 29 2016 Deep convection associated with the tropical cyclone increased this morning, especially around western Cuba where rainfall totals of up to 12 inches may have occurred. A NOAA Hurricane Hunter aircraft investigated the system earlier this morning and did not find winds of tropical storm force. Based on those observations, and Dvorak satellite estimates, the current intensity is held at 30 kt. An Air Force Hurricane Hunter aircraft is scheduled to investigate the depression this afternoon, which should give a better estimate of the strength of the system. Vertical shear should remain modest for the next couple of days, but begin to increase around 72 hours as the environment becomes more baroclinic with strong upper-level westerlies prevailing over northern Florida. This is likely to discourage significant strengthening as the cyclone nears landfall. The official intensity forecast is close to the latest statistical/dynamical LGEM guidance. The center is not easy to locate but is believed to be situated near the northwestern edge of the cloud mass, and the motion is estimated to be 280/6 kt. A mid-tropospheric shortwave trough developing over the southeastern United States is expected to induce a turn toward the north and northeast in 2 to 3 days, followed by acceleration toward the east-northeast late in the forecast period. The official forecast is similar to that from the previous advisory, and is mainly a blend of the latest GFS and ECMWF solutions but leans toward the latter model. FORECAST POSITIONS AND MAX WINDS INIT 29/1500Z 23.6N 84.3W 30 KT 35 MPH 12H 30/0000Z 23.9N 85.3W 35 KT 40 MPH 24H 30/1200Z 24.4N 86.4W 40 KT 45 MPH 36H 31/0000Z 25.0N 87.0W 45 KT 50 MPH 48H 31/1200Z 26.1N 86.7W 50 KT 60 MPH 72H 01/1200Z 28.6N 83.8W 55 KT 65 MPH 96H 02/1200Z 31.5N 79.0W 50 KT 60 MPH 120H 03/1200Z 34.0N 71.5W 50 KT 60 MPH $$ Forecaster Pasch
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