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Hurricane Hilda Forecast Discussion Number 14
2021-08-03 04:36:34| National Hurricane Center (East Pacific)
Issued at 800 PM PDT Mon Aug 02 2021 000 WTPZ43 KNHC 030236 TCDEP3 Hurricane Hilda Discussion Number 14 NWS National Hurricane Center Miami FL EP082021 800 PM PDT Mon Aug 02 2021 Moderate northeasterly wind shear continues to take a toll on Hilda this evening. The upper-level outflow on the northern and eastern sides of the circulation has a sharp edge in satellite imagery. Recent SSMIS microwave data show the structure of Hilda has changed little since earlier today, with a weakness in the upshear portion of the eyewall and a slight displacement of the low- and mid-level centers. The various objective intensity estimates and subjective Dvorak classifications from TAFB and SAB support holding the initial intensity at 65 kt for this advisory. Hilda is moving northwestward, or 315/6 kt, under the influence of a subtropical ridge to its northeast. This general motion is expected to continue through midweek, and the track guidance remains tightly clustered during this period. As Hilda continues weakening and the ridge builds westward, Hilda is forecast to move west-northwestward and then westward within the low-level flow through the rest of the period. However, a complicating factor is the potential for some interaction with the remnants of TD Nine-E, which now have a high chance of redevelopment during the next couple of days. The official NHC track forecast has been adjusted slightly poleward once again at day 3 and beyond, bringing it closer to the reliable consensus aids TVCE and HCCA and accounting for the aforementioned possibility of some interaction between the two systems. Moderate northeasterly shear will persist for the next day or so, and afterwards the cooler sea-surface temperatures along Hilda's forecast track will offset any reduction in shear over the system. Therefore, weakening is expected during the next several days. The official NHC intensity forecast lies slightly above the multi-model consensus aids in the near-term, but then closely follows IVCN and HCCA once Hilda reaches the cooler waters. The system is forecast to degenerate into a remnant low by 96 h, but this transition could occur soon after 72 h based on some of the latest GFS and ECMWF simulated satellite imagery. FORECAST POSITIONS AND MAX WINDS INIT 03/0300Z 16.4N 123.3W 65 KT 75 MPH 12H 03/1200Z 17.1N 123.9W 60 KT 70 MPH 24H 04/0000Z 18.0N 124.8W 50 KT 60 MPH 36H 04/1200Z 18.9N 125.9W 45 KT 50 MPH 48H 05/0000Z 19.8N 127.2W 40 KT 45 MPH 60H 05/1200Z 20.8N 128.9W 35 KT 40 MPH 72H 06/0000Z 21.6N 130.9W 30 KT 35 MPH 96H 07/0000Z 22.5N 135.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 08/0000Z 22.6N 139.5W 20 KT 25 MPH...POST-TROP/REMNT LOW $$ Forecaster Reinhart/Pasch
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