576 WTNT80 EGRR 170411 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 00UTC 17.09.2023 TROPICAL STORM LEE ANALYSED POSITION : 44.7N 66.1W ATCF IDENTIFIER : AL132023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 17.09.2023 44.7N 66.1W MODERATE 12UTC 17.09.2023 47.0N 62.8W MODERATE WEAKENING SLIGHTLY 00UTC 18.09.2023 51.1N 56.8W MODERATE LITTLE CHANGE 12UTC 18.09.2023 52.9N 48.0W MODERATE LITTLE CHANGE 00UTC 19.09.2023 BELOW TROPICAL STORM STRENGTH TROPICAL STORM NIGEL ANALYSED POSITION : 21.1N 46.9W ATCF IDENTIFIER : AL152023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 17.09.2023 21.1N 46.9W WEAK 12UTC 17.09.2023 23.1N 49.0W WEAK LITTLE CHANGE 00UTC 18.09.2023 24.5N 49.7W WEAK LITTLE CHANGE 12UTC 18.09.2023 26.2N 50.9W WEAK LITTLE CHANGE 00UTC 19.09.2023 28.0N 52.1W WEAK LITTLE CHANGE 12UTC 19.09.2023 29.7N 53.7W WEAK LITTLE CHANGE 00UTC 20.09.2023 31.9N 54.8W WEAK LITTLE CHANGE 12UTC 20.09.2023 34.5N 54.6W MODERATE LITTLE CHANGE 00UTC 21.09.2023 37.0N 52.7W MODERATE INTENSIFYING SLIGHTLY 12UTC 21.09.2023 39.4N 48.1W MODERATE INTENSIFYING SLIGHTLY 00UTC 22.09.2023 41.4N 41.5W MODERATE LITTLE CHANGE 12UTC 22.09.2023 44.8N 32.8W MODERATE LITTLE CHANGE 00UTC 23.09.2023 50.0N 26.2W STRONG INTENSIFYING SLIGHTLY 12UTC 23.09.2023 POST-TROPICAL TROPICAL DEPRESSION 12E ANALYSED POSITION : 13.4N 140.4W ATCF IDENTIFIER : EP122023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 17.09.2023 13.4N 140.4W WEAK 12UTC 17.09.2023 BELOW TROPICAL STORM STRENGTH TROPICAL STORM MARGOT ANALYSED POSITION : 34.0N 40.3W ATCF IDENTIFIER : AL142023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 17.09.2023 34.0N 40.3W WEAK 12UTC 17.09.2023 34.2N 42.4W WEAK WEAKENING SLIGHTLY 00UTC 18.09.2023 35.3N 43.8W WEAK LITTLE CHANGE 12UTC 18.09.2023 37.0N 44.0W WEAK LITTLE CHANGE 00UTC 19.09.2023 38.6N 42.0W WEAK LITTLE CHANGE 12UTC 19.09.2023 38.9N 38.2W WEAK LITTLE CHANGE 00UTC 20.09.2023 38.1N 35.2W WEAK LITTLE CHANGE 12UTC 20.09.2023 37.0N 33.3W WEAK LITTLE CHANGE 00UTC 21.09.2023 36.7N 32.4W WEAK LITTLE CHANGE 12UTC 21.09.2023 37.3N 30.4W WEAK LITTLE CHANGE 00UTC 22.09.2023 37.6N 30.5W WEAK LITTLE CHANGE 12UTC 22.09.2023 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 72 HOURS FORECAST POSITION AT T+ 72 : 11.1N 17.0W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 20.09.2023 11.1N 17.0W WEAK 12UTC 20.09.2023 13.0N 18.1W WEAK LITTLE CHANGE 00UTC 21.09.2023 13.9N 20.9W WEAK LITTLE CHANGE 12UTC 21.09.2023 15.0N 24.6W WEAK LITTLE CHANGE 00UTC 22.09.2023 15.4N 28.4W WEAK LITTLE CHANGE 12UTC 22.09.2023 15.9N 31.9W WEAK LITTLE CHANGE 00UTC 23.09.2023 17.0N 34.9W WEAK LITTLE CHANGE 12UTC 23.09.2023 18.0N 37.9W WEAK LITTLE CHANGE 00UTC 24.09.2023 18.3N 39.8W WEAK LITTLE CHANGE THIS INFORMATION IS PROVIDED AS GUIDANCE FOR TROPICAL CYCLONE RSMCS. IT REQUIRES INTERPRETATION BY TROPICAL CYCLONE SPECIALISTS AND SHOULD NOT BE CONSIDERED AS A FINAL PRODUCT. BULLETINS ARE NOW AVAILABLE WHICH PROVIDE EXPLICIT GUIDANCE ON CENTRAL PRESSURE AND MAXIMUM WIND SPEED. FOR FURTHER INFORMATION CONTACT TROPICAL_CYCLONES@METOFFICE.GOV.UK MET OFFICE, EXETER, UK TOO 170411