ZCZC MIATCDEP5 ALL TTAA00 KNHC DDHHMM Tropical Storm Irwin Discussion Number 7 NWS National Hurricane Center Miami FL EP102023 500 AM HST Mon Aug 28 2023 Irwin continues to be a disheveled tropical cyclone. Infrared satellite imagery has shown a recent burst of convection just north of the estimated center and data from a microwave satellite pass at 0927 UTC indicates there is a curved band around the eastern portion of the semicircle. Objective and subjective satellite estimates range from 32-39 kt and the initial intensity is held at 35 kt as a blend of these measurements. The tropical storm is moving west-northwestward at 7 kt. The cyclone is expected to turn westward in the low-level flow shortly and continue in this direction with an increase in forward speed for the next several days. The most recent forecast has shifted slightly north of the previous prediction and lies near the various consensus aids. Irwin is crossing over a cooling gradient of sea surface temperatures and into a dry and stable environment. Simulated satellite imagery from global models suggests that the cyclone should be devoid of convection within 48 hours. Only minor adjustments have been made to the intensity forecast and it now shows Irwin becoming a remnant low in a couple of days. FORECAST POSITIONS AND MAX WINDS INIT 28/1500Z 18.0N 123.6W 35 KT 40 MPH 12H 29/0000Z 18.5N 125.2W 35 KT 40 MPH 24H 29/1200Z 18.7N 127.9W 30 KT 35 MPH 36H 30/0000Z 18.6N 130.6W 30 KT 35 MPH 48H 30/1200Z 18.6N 133.1W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 31/0000Z 18.7N 135.4W 30 KT 35 MPH...POST-TROP/REMNT LOW 72H 31/1200Z 18.8N 137.2W 30 KT 35 MPH...POST-TROP/REMNT LOW 96H 01/1200Z 19.1N 139.9W 30 KT 35 MPH...POST-TROP/REMNT LOW 120H 02/1200Z 19.0N 142.2W 25 KT 30 MPH...POST-TROP/REMNT LOW $$ Forecaster Bucci NNNN
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