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Tropical Depression Mindy Forecast Discussion Number 4
2021-09-09 16:52:11| National Hurricane Center (Atlantic)
Issued at 1100 AM EDT Thu Sep 09 2021 000 WTNT43 KNHC 091452 TCDAT3 Tropical Depression Mindy Discussion Number 4 NWS National Hurricane Center Miami FL AL132021 1100 AM EDT Thu Sep 09 2021 Doppler radar data and surface observations show that the center of Mindy has recently moved offshore the coast of Georgia. Buoy 41008 located off the Georgia coast recently recorded 1-min sustained winds of 29 kt with gusts as high as 33 kt. Thus, 30 kt is maintained as the intensity for this advisory. Mindy is located in an environment of strong south to southwesterly vertical wind shear. Over the next 24 h, the shear is expected to become even stronger. The strong shear should prevent restrengthening and is likely to strip away any remaining convection by Friday or Friday night. Mindy is forecast to become post-tropical Friday evening. Most of the global models suggest that the cyclone will open up into a trough in 36-48 h, but it is possible this could happen sooner, as surface observations already show that easterly winds on the north side have become quite weak. The NHC forecast calls for dissipation Friday night, which is sooner than the previous advisory. Mindy continues moving quickly to the east-northeast or 065/18 kt. There has been no change to the track forecast philosophy. Mindy is forecast to continue moving east-northeastward at a similar speed for the next 24 h near the southern portion of a deep-layer trough moving across the eastern United States. Once the trough begins to lift northeastward, Mindy should slow down a little on Friday. The main adjustment to the NHC track is to show a slightly faster motion toward the east-northeast at the 24-36 h points. Key Messages: 1. Mindy will produce locally heavy rainfall across portions of coastal South Carolina through early this afternoon. This rainfall may produce isolated to scattered flash, urban, and small stream flooding. FORECAST POSITIONS AND MAX WINDS INIT 09/1500Z 31.5N 80.7W 30 KT 35 MPH 12H 10/0000Z 32.5N 77.5W 30 KT 35 MPH 24H 10/1200Z 33.6N 73.4W 30 KT 35 MPH 36H 11/0000Z 34.3N 70.3W 25 KT 30 MPH...POST-TROPICAL 48H 11/1200Z...DISSIPATED $$ Forecaster D. Zelinsky/Hagen
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