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Hurricane Marie Forecast Discussion Number 17
2020-10-03 10:38:20| National Hurricane Center (East Pacific)
Issued at 200 AM PDT Sat Oct 03 2020 122 WTPZ43 KNHC 030838 TCDEP3 Hurricane Marie Discussion Number 17 NWS National Hurricane Center Miami FL EP182020 200 AM PDT Sat Oct 03 2020 Marie continues to be a powerful and dangerous hurricane. Cloud tops surrounding the eye have cooled and the center is now surrounded by a ring of convection with tops colder than -70 degrees C. The latest Dvorak intensity estimate ranges have narrowed considerably to 115-122 kt, so there is higher confidence in the cyclone's strength. The initial advisory intensity is being kept at 115 kt and is in agreement with both of the subjective Dvorak estimates from TAFB and SAB. The environment surrounding Marie will soon become rather hostile and the hurricane will likely not maintain this intensity for much longer. By later today, increasing southwesterly winds aloft should begin to degrade the symmetry of the cyclone. Later tonight, the cyclone is forecast to cross the 26 degree C SST isotherm. And by Monday, Marie is expected be in an environment characterized by vertical wind shear greater than 30 kt, low- to mid-level relative humidity values of less than 40 percent, and over waters cooler than 25 degrees C. These increasingly negative factors are expected to cause Marie to begin weakening later today, with rapid weakening possible Sunday into Monday. The latest NHC intensity forecast is in good agreement with the various consensus intensity guidance, and indicates that Marie should weaken to a tropical storm on Sunday night and a tropical depression early next week. By the end of the forecast period, the system is expected to become a post tropical cyclone devoid of deep convection. Marie continues to move northwestward and is forecast to continue to do so through the remainder of the weekend as it moves along the southwest periphery of a mid-level ridge. The ridge is forecast to expand westward early next week, which should force the cyclone to turn to the west-northwest. Toward the end of the 5-day forecast period, a large deep-layer trough north of Marie should cause it to begin a turn to the right. The NHC track forecast is little changed from the previous one, and is close to the HFIP corrected consensus HCCA. FORECAST POSITIONS AND MAX WINDS INIT 03/0900Z 17.9N 126.4W 115 KT 130 MPH 12H 03/1800Z 18.6N 127.2W 110 KT 125 MPH 24H 04/0600Z 19.5N 128.2W 90 KT 105 MPH 36H 04/1800Z 20.3N 129.2W 75 KT 85 MPH 48H 05/0600Z 20.9N 130.5W 60 KT 70 MPH 60H 05/1800Z 21.5N 131.9W 50 KT 60 MPH 72H 06/0600Z 22.0N 133.1W 40 KT 45 MPH 96H 07/0600Z 23.0N 135.3W 30 KT 35 MPH 120H 08/0600Z 24.5N 136.5W 30 KT 35 MPH...POST-TROP/REMNT LOW $$ Forecaster Latto
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