326 WTNT80 EGRR 270359 MET OFFICE TROPICAL CYCLONE GUIDANCE FOR NORTH-EAST PACIFIC AND ATLANTIC GLOBAL MODEL DATA TIME 00UTC 27.08.2020 TROPICAL STORM HERNAN ANALYSED POSITION : 18.3N 106.1W ATCF IDENTIFIER : EP132020 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 27.08.2020 18.3N 106.1W WEAK 12UTC 27.08.2020 18.7N 106.0W WEAK LITTLE CHANGE 00UTC 28.08.2020 20.3N 107.1W MODERATE LITTLE CHANGE 12UTC 28.08.2020 23.0N 108.8W WEAK WEAKENING SLIGHTLY 00UTC 29.08.2020 26.0N 112.1W WEAK LITTLE CHANGE 12UTC 29.08.2020 BELOW TROPICAL STORM STRENGTH HURRICANE LAURA ANALYSED POSITION : 28.4N 93.0W ATCF IDENTIFIER : AL132020 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 27.08.2020 28.4N 93.0W STRONG 12UTC 27.08.2020 30.8N 93.4W STRONG WEAKENING SLIGHTLY 00UTC 28.08.2020 33.4N 93.0W MODERATE WEAKENING SLIGHTLY 12UTC 28.08.2020 35.1N 91.8W MODERATE WEAKENING SLIGHTLY 00UTC 29.08.2020 36.6N 88.9W MODERATE LITTLE CHANGE 12UTC 29.08.2020 36.9N 83.6W MODERATE LITTLE CHANGE 00UTC 30.08.2020 37.2N 76.4W MODERATE LITTLE CHANGE 12UTC 30.08.2020 40.9N 68.9W STRONG INTENSIFYING RAPIDLY 00UTC 31.08.2020 48.1N 61.5W STRONG INTENSIFYING SLIGHTLY 12UTC 31.08.2020 52.0N 60.7W STRONG WEAKENING SLIGHTLY 00UTC 01.09.2020 53.7N 56.6W MODERATE WEAKENING SLIGHTLY 12UTC 01.09.2020 BELOW TROPICAL STORM STRENGTH TROPICAL STORM ISELLE ANALYSED POSITION : 16.0N 116.5W ATCF IDENTIFIER : EP142020 VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 00UTC 27.08.2020 16.0N 116.5W MODERATE 12UTC 27.08.2020 17.3N 115.6W MODERATE LITTLE CHANGE 00UTC 28.08.2020 17.7N 115.3W MODERATE LITTLE CHANGE 12UTC 28.08.2020 18.1N 115.1W MODERATE LITTLE CHANGE 00UTC 29.08.2020 19.0N 115.3W MODERATE LITTLE CHANGE 12UTC 29.08.2020 20.4N 115.8W MODERATE LITTLE CHANGE 00UTC 30.08.2020 22.6N 116.2W MODERATE WEAKENING SLIGHTLY 12UTC 30.08.2020 24.3N 117.2W WEAK WEAKENING SLIGHTLY 00UTC 31.08.2020 24.9N 117.9W WEAK LITTLE CHANGE 12UTC 31.08.2020 25.3N 117.9W WEAK LITTLE CHANGE 00UTC 01.09.2020 25.7N 118.2W WEAK LITTLE CHANGE 12UTC 01.09.2020 26.0N 118.1W WEAK LITTLE CHANGE 00UTC 02.09.2020 BELOW TROPICAL STORM STRENGTH NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 36 HOURS FORECAST POSITION AT T+ 36 : 11.9N 143.7W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 28.08.2020 11.9N 143.7W WEAK 00UTC 29.08.2020 12.0N 144.2W WEAK LITTLE CHANGE 12UTC 29.08.2020 12.0N 145.3W WEAK LITTLE CHANGE 00UTC 30.08.2020 12.3N 147.1W WEAK LITTLE CHANGE 12UTC 30.08.2020 12.6N 148.9W WEAK LITTLE CHANGE 00UTC 31.08.2020 13.1N 151.1W WEAK LITTLE CHANGE 12UTC 31.08.2020 13.9N 153.5W WEAK LITTLE CHANGE 00UTC 01.09.2020 14.5N 156.0W WEAK LITTLE CHANGE 12UTC 01.09.2020 15.1N 158.4W WEAK LITTLE CHANGE 00UTC 02.09.2020 15.5N 160.5W WEAK LITTLE CHANGE NEW TROPICAL STORM FORECAST TO DEVELOP AFTER 108 HOURS FORECAST POSITION AT T+108 : 13.0N 63.8W VERIFYING TIME POSITION STRENGTH TENDENCY -------------- -------- -------- -------- 12UTC 31.08.2020 13.0N 63.8W WEAK 00UTC 01.09.2020 13.9N 65.7W WEAK LITTLE CHANGE 12UTC 01.09.2020 14.5N 68.5W WEAK LITTLE CHANGE 00UTC 02.09.2020 14.9N 70.8W 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 270359