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Tropical Storm Hernan Forecast Discussion Number 6
2020-08-27 16:48:10| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Thu Aug 27 2020 000 WTPZ43 KNHC 271448 TCDEP3 Tropical Storm Hernan Discussion Number 6 NWS National Hurricane Center Miami FL EP132020 900 AM MDT Thu Aug 27 2020 First light visible satellite imagery reveals that Hernan remains a sheared tropical cyclone with most of the deep convection confined to the western semicircle. Even though convection has waned a bit overnight, there appears to be a new cluster developing. Therefore the initial intensity is being held at 40 kt, based on the earlier morning ASCAT overpass. Hernan should at least maintain its current strength for the next 12-24 h as it remains over very warm waters while battling moderate easterly shear. This shear is not forecast to abate during the forecast period. And after 24 h, the cyclone is expected to begin moving over progressively cooler waters. The combination of these two factors should induce a weakening trend. By 60 h, simulated satellite imagery by global models suggest that the cyclone will become devoid of deep convection. After that time, the remnant low is expected to be absorbed within the broader circulation of Hernan to its west. The latest NHC intensity forecast is close to the IVCN/ICON intensity consensus. Hernan has turned to the north-northwest and is moving at about 4 kt. There is no change to the track forecast reasoning. Hernan is expected to remain caught within a large-scale, eastern North Pacific cyclonic gyre during the next few days, which will result in Hernan moving counter-clockwise around the eastern and northern periphery of the gyre. The cyclone will continue to parallel the coast of southwestern Mexico through this evening, followed by a northwestward then westward turn tonight and Friday. The westward motion should continue until the system becomes absorbed early next week. FORECAST POSITIONS AND MAX WINDS INIT 27/1500Z 19.1N 106.2W 40 KT 45 MPH 12H 28/0000Z 20.1N 107.0W 40 KT 45 MPH 24H 28/1200Z 21.2N 108.5W 35 KT 40 MPH 36H 29/0000Z 22.2N 110.2W 30 KT 35 MPH 48H 29/1200Z 22.8N 112.3W 30 KT 35 MPH 60H 30/0000Z 22.5N 113.9W 30 KT 35 MPH...POST-TROP/REMNT LOW 72H 30/1200Z...ABSORBED $$ Forecaster Latto
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