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Hurricane Marie Forecast Discussion Number 15
2020-10-02 22:41:59| National Hurricane Center (East Pacific)
Issued at 200 PM PDT Fri Oct 02 2020 000 WTPZ43 KNHC 022041 TCDEP3 Hurricane Marie Discussion Number 15 NWS National Hurricane Center Miami FL EP182020 200 PM PDT Fri Oct 02 2020 Marie remains a powerful hurricane this afternoon. A 1530 UTC SSMIS 91 GHz microwave image showed a well-defined, closed eyewall with a 20 nm eye, which is still evident in recent GOES-17 visible and infrared satellite imagery. The initial intensity is held at 115 kt based on T6.0 Dvorak classifications from TAFB and SAB, which are consistent with recent ADT and earlier SATCON estimates. The 34-kt radii are expanded slightly with this package based on recent ASCAT data. Marie is moving west-northwestward (295 degrees) at 10 kt, around the southwestern periphery of a mid-level ridge centered over the southwestern United States. A break in the ridge should allow Marie to turn northwestward within the next 24 hours and maintain that motion over the next several days. By day 5, an approaching upper-level trough moving across the eastern Pacific Ocean should turn Marie more toward the north-northwest. There is still more noticeable spread in the guidance at days 4 and 5, likely related to differences in the amplitude of the upper-level trough. It is worth noting that the GFS depicts a deeper upper trough, and thus a more drastic northerly turn, than the rest of the global models. Overall, the NHC forecast was again slowed down a bit and shifted slightly to the right to align better with the latest TVCE multi-model consensus and HCCA aids. Marie is expected to remain in a low-shear environment with sea surface temperatures of 26 degrees Celsius for the next 18-24 hours. Although slight additional strengthening cannot be ruled out, the storm is running out of time before environmental conditions become more hostile. After 24 hours, increasing deep-layer southwesterly shear and cooler waters should support a steady weakening trend through the rest of the forecast period. Marie is expected to fall below hurricane strength by 60 hours and become a tropical depression by day 5. The latest NHC intensity forecast shows a slightly faster weakening trend and remains very close to the IVCN consensus and the HCCA aid. FORECAST POSITIONS AND MAX WINDS INIT 02/2100Z 16.9N 125.0W 115 KT 130 MPH 12H 03/0600Z 17.6N 126.1W 115 KT 130 MPH 24H 03/1800Z 18.6N 127.4W 105 KT 120 MPH 36H 04/0600Z 19.5N 128.4W 90 KT 105 MPH 48H 04/1800Z 20.1N 129.5W 70 KT 80 MPH 60H 05/0600Z 20.6N 130.8W 60 KT 70 MPH 72H 05/1800Z 21.2N 132.1W 55 KT 65 MPH 96H 06/1800Z 22.0N 134.5W 35 KT 40 MPH 120H 07/1800Z 23.5N 136.0W 30 KT 35 MPH $$ Forecaster Reinhart/Berg
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