338 WTNT80 EGRR 240409 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 00UTC 24.10.2023 TROPICAL STORM OTIS ANALYSED POSITION : 12.9N 98.2W ATCF IDENTIFIER : EP182023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 24.10.2023 12.9N 98.2W WEAK 12UTC 24.10.2023 13.8N 99.2W WEAK LITTLE CHANGE 00UTC 25.10.2023 14.7N 99.9W WEAK LITTLE CHANGE 12UTC 25.10.2023 15.7N 100.1W MODERATE LITTLE CHANGE 00UTC 26.10.2023 16.3N 100.1W MODERATE LITTLE CHANGE 12UTC 26.10.2023 17.1N 101.5W WEAK WEAKENING SLIGHTLY 00UTC 27.10.2023 BELOW TROPICAL STORM STRENGTH HURRICANE TAMMY ANALYSED POSITION : 22.8N 63.5W ATCF IDENTIFIER : AL202023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 24.10.2023 22.8N 63.5W MODERATE 12UTC 24.10.2023 23.4N 62.6W MODERATE LITTLE CHANGE 00UTC 25.10.2023 24.4N 61.2W MODERATE LITTLE CHANGE 12UTC 25.10.2023 25.8N 59.5W MODERATE LITTLE CHANGE 00UTC 26.10.2023 28.2N 57.9W MODERATE INTENSIFYING SLIGHTLY 12UTC 26.10.2023 30.3N 58.5W MODERATE LITTLE CHANGE 00UTC 27.10.2023 30.9N 59.8W MODERATE LITTLE CHANGE 12UTC 27.10.2023 31.3N 61.4W MODERATE LITTLE CHANGE 00UTC 28.10.2023 31.7N 62.6W MODERATE LITTLE CHANGE 12UTC 28.10.2023 32.8N 62.3W MODERATE LITTLE CHANGE 00UTC 29.10.2023 34.5N 60.3W MODERATE LITTLE CHANGE 12UTC 29.10.2023 35.3N 56.4W MODERATE LITTLE CHANGE 00UTC 30.10.2023 34.5N 50.6W MODERATE LITTLE CHANGE 12UTC 30.10.2023 32.5N 45.3W MODERATE LITTLE CHANGE 00UTC 31.10.2023 28.7N 43.4W MODERATE LITTLE CHANGE TROPICAL DEPRESSION 21L ANALYSED POSITION : 13.2N 87.5W ATCF IDENTIFIER : AL212023 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 24.10.2023 13.2N 87.5W WEAK 12UTC 24.10.2023 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 36 HOURS FORECAST POSITION AT T+ 36 : 7.4N 121.5W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 25.10.2023 7.4N 121.5W WEAK 00UTC 26.10.2023 7.2N 121.4W WEAK LITTLE CHANGE 12UTC 26.10.2023 7.5N 121.5W WEAK LITTLE CHANGE 00UTC 27.10.2023 7.9N 121.9W WEAK LITTLE CHANGE 12UTC 27.10.2023 8.1N 122.6W WEAK LITTLE CHANGE 00UTC 28.10.2023 8.0N 123.6W WEAK LITTLE CHANGE 12UTC 28.10.2023 7.8N 124.9W WEAK LITTLE CHANGE 00UTC 29.10.2023 7.9N 126.3W WEAK LITTLE CHANGE 12UTC 29.10.2023 8.0N 127.6W WEAK LITTLE CHANGE 00UTC 30.10.2023 7.8N 128.5W WEAK LITTLE CHANGE 12UTC 30.10.2023 7.7N 129.8W WEAK LITTLE CHANGE 00UTC 31.10.2023 7.7N 130.5W WEAK LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 144 HOURS FORECAST POSITION AT T+144 : 10.3N 94.7W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 30.10.2023 10.3N 94.7W WEAK 12UTC 30.10.2023 10.8N 94.6W WEAK LITTLE CHANGE 00UTC 31.10.2023 11.1N 95.0W WEAK LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 162 HOURS FORECAST POSITION AT T+162 : 15.0N 79.2W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 31.10.2023 15.5N 80.1W 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 240409