450 WTNT80 EGRR 051603 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 12UTC 05.09.2021 TROPICAL DEPRESSION 91L ANALYSED POSITION : 15.6N 93.3W ATCF IDENTIFIER : AL912021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 05.09.2021 15.6N 93.3W WEAK 00UTC 06.09.2021 BELOW TROPICAL STORM STRENGTH HURRICANE LARRY ANALYSED POSITION : 19.0N 49.5W ATCF IDENTIFIER : AL122021 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 05.09.2021 19.0N 49.5W INTENSE 00UTC 06.09.2021 20.5N 51.4W INTENSE WEAKENING SLIGHTLY 12UTC 06.09.2021 21.7N 53.2W INTENSE INTENSIFYING SLIGHTLY 00UTC 07.09.2021 22.8N 54.6W INTENSE LITTLE CHANGE 12UTC 07.09.2021 24.1N 56.3W INTENSE INTENSIFYING SLIGHTLY 00UTC 08.09.2021 25.8N 57.7W INTENSE LITTLE CHANGE 12UTC 08.09.2021 27.5N 59.7W INTENSE LITTLE CHANGE 00UTC 09.09.2021 29.5N 61.7W INTENSE LITTLE CHANGE 12UTC 09.09.2021 31.9N 63.3W INTENSE LITTLE CHANGE 00UTC 10.09.2021 35.7N 63.3W INTENSE WEAKENING SLIGHTLY 12UTC 10.09.2021 40.8N 61.2W INTENSE WEAKENING SLIGHTLY 00UTC 11.09.2021 46.5N 55.5W INTENSE WEAKENING RAPIDLY 12UTC 11.09.2021 52.3N 48.3W STRONG WEAKENING RAPIDLY NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 36 HOURS FORECAST POSITION AT T+ 36 : 14.2N 119.1W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 07.09.2021 14.2N 119.1W WEAK 12UTC 07.09.2021 14.5N 118.6W WEAK LITTLE CHANGE 00UTC 08.09.2021 14.2N 117.5W WEAK LITTLE CHANGE 12UTC 08.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 60 HOURS FORECAST POSITION AT T+ 60 : 18.1N 109.4W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 08.09.2021 18.1N 109.4W WEAK 12UTC 08.09.2021 18.3N 110.4W WEAK LITTLE CHANGE 00UTC 09.09.2021 18.9N 111.1W WEAK LITTLE CHANGE 12UTC 09.09.2021 20.0N 111.8W WEAK LITTLE CHANGE 00UTC 10.09.2021 21.1N 113.4W WEAK LITTLE CHANGE 12UTC 10.09.2021 22.2N 115.3W WEAK LITTLE CHANGE 00UTC 11.09.2021 22.8N 116.3W WEAK LITTLE CHANGE 12UTC 11.09.2021 23.1N 117.6W WEAK LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 78 HOURS FORECAST POSITION AT T+ 78 : 12.9N 150.0W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 09.09.2021 13.1N 150.3W WEAK WEAKENING SLIGHTLY 12UTC 09.09.2021 13.4N 151.0W WEAK LITTLE CHANGE 00UTC 10.09.2021 13.5N 151.5W WEAK LITTLE CHANGE 12UTC 10.09.2021 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 84 HOURS FORECAST POSITION AT T+ 84 : 14.8N 134.8W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 09.09.2021 14.8N 134.8W WEAK 12UTC 09.09.2021 14.9N 134.3W WEAK LITTLE CHANGE 00UTC 10.09.2021 14.7N 133.3W WEAK LITTLE CHANGE 12UTC 10.09.2021 14.2N 132.9W WEAK LITTLE CHANGE 00UTC 11.09.2021 14.0N 133.2W WEAK LITTLE CHANGE 12UTC 11.09.2021 13.6N 134.0W 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 051603