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Post-Tropical Cyclone Gamma Forecast Discussion Number 15
2020-10-06 04:31:40| National Hurricane Center (Atlantic)
Issued at 1000 PM CDT Mon Oct 05 2020 000 WTNT45 KNHC 060231 TCDAT5 Post-Tropical Cyclone Gamma Discussion Number 15 NWS National Hurricane Center Miami FL AL252020 1000 PM CDT Mon Oct 05 2020 Gamma was entirely devoid of convection for most of the day. Shortly before sunset, a few disorganized thunderstorms developed to the southeast of the cyclone's center, however these appear to be forced at least in part by a sea breeze boundary and are not exclusively associated with Gamma. A few other small cells of convection have developed to the west of Gamma's center during the past hour or so, but not nearly enough to be considered sufficiently organized to meet the requirement for a tropical cyclone. Gamma is therefore now considered to be post-tropical and this will be the last NHC advisory. The cyclone could still produce some additional disorganized convection and periods of heavy rain overnight as it moves inland over the Yucatan peninsula, but this is not expected to result in significant regeneration. Some of this rain could impact areas that are preparing for the much more significant approach of Hurricane Delta in a day or so. The cyclone is moving southwestward near 5 kt, and this should continue for another day or so until it dissipates. The winds associated with Gamma's remnants should gradually weaken through that time, though the system could still produce a few areas of heavy rain over southeastern Mexico. It is worth noting that several model trackers, and consequently the consensus aids, depict that Gamma will move northward over the Gulf of Mexico and strengthen significantly in a couple of days. This is because the trackers lose track of Gamma when it dissipates and start following nearby Hurricane Delta instead. In reality, no models forecast that Gamma will remain a well-defined cyclone for more than another day or two. FORECAST POSITIONS AND MAX WINDS INIT 06/0300Z 21.6N 88.4W 30 KT 35 MPH...POST-TROPICAL 12H 06/1200Z 21.1N 88.9W 30 KT 35 MPH...POST-TROP/INLAND 24H 07/0000Z 20.2N 89.6W 25 KT 30 MPH...POST-TROP/INLAND 36H 07/1200Z...DISSIPATED $$ Forecaster Zelinsky
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