079 WTNT80 EGRR 280400 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 00UTC 28.09.2021 TROPICAL DEPRESSION 91L ANALYSED POSITION : 8.9N 25.9W ATCF IDENTIFIER : AL912021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 28.09.2021 8.9N 25.9W WEAK 12UTC 28.09.2021 BELOW TROPICAL STORM STRENGTH TROPICAL DEPRESSION 90L ANALYSED POSITION : 7.5N 17.9W ATCF IDENTIFIER : AL902021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 28.09.2021 7.5N 17.9W WEAK 12UTC 28.09.2021 BELOW TROPICAL STORM STRENGTH HURRICANE SAM ANALYSED POSITION : 16.5N 52.9W ATCF IDENTIFIER : AL182021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 28.09.2021 16.5N 52.9W STRONG 12UTC 28.09.2021 17.4N 54.0W STRONG WEAKENING SLIGHTLY 00UTC 29.09.2021 18.2N 55.1W STRONG LITTLE CHANGE 12UTC 29.09.2021 19.0N 56.5W STRONG LITTLE CHANGE 00UTC 30.09.2021 20.1N 57.9W STRONG INTENSIFYING SLIGHTLY 12UTC 30.09.2021 21.7N 59.5W INTENSE INTENSIFYING SLIGHTLY 00UTC 01.10.2021 24.0N 60.9W INTENSE LITTLE CHANGE 12UTC 01.10.2021 26.9N 61.9W INTENSE LITTLE CHANGE 00UTC 02.10.2021 30.9N 61.6W INTENSE LITTLE CHANGE 12UTC 02.10.2021 35.4N 60.0W INTENSE LITTLE CHANGE 00UTC 03.10.2021 40.1N 57.2W INTENSE LITTLE CHANGE 12UTC 03.10.2021 46.5N 52.7W STRONG WEAKENING RAPIDLY 00UTC 04.10.2021 53.7N 49.3W STRONG LITTLE CHANGE TROPICAL DEPRESSION PETER ANALYSED POSITION : 31.8N 59.1W ATCF IDENTIFIER : AL162021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 28.09.2021 31.8N 59.1W WEAK 12UTC 28.09.2021 33.4N 59.0W WEAK LITTLE CHANGE 00UTC 29.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 30 HOURS FORECAST POSITION AT T+ 30 : 8.1N 22.1W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 29.09.2021 8.2N 23.5W WEAK INTENSIFYING SLIGHTLY 00UTC 30.09.2021 8.6N 25.4W WEAK LITTLE CHANGE 12UTC 30.09.2021 8.9N 27.4W MODERATE INTENSIFYING SLIGHTLY 00UTC 01.10.2021 10.1N 28.8W MODERATE INTENSIFYING SLIGHTLY 12UTC 01.10.2021 11.7N 30.5W MODERATE INTENSIFYING SLIGHTLY 00UTC 02.10.2021 13.7N 32.3W MODERATE WEAKENING SLIGHTLY 12UTC 02.10.2021 15.7N 34.2W MODERATE WEAKENING SLIGHTLY 00UTC 03.10.2021 17.8N 36.3W WEAK WEAKENING SLIGHTLY 12UTC 03.10.2021 19.5N 38.1W WEAK LITTLE CHANGE 00UTC 04.10.2021 21.7N 39.9W WEAK LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 78 HOURS FORECAST POSITION AT T+ 78 : 13.1N 130.1W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 01.10.2021 13.3N 130.4W WEAK WEAKENING RAPIDLY 00UTC 02.10.2021 13.8N 131.0W WEAK LITTLE CHANGE 12UTC 02.10.2021 14.4N 131.5W WEAK LITTLE CHANGE 00UTC 03.10.2021 15.1N 132.1W WEAK LITTLE CHANGE 12UTC 03.10.2021 15.4N 133.1W WEAK LITTLE CHANGE 00UTC 04.10.2021 15.7N 133.7W 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 280400