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Tropical Storm Odalys Forecast Discussion Number 5
2020-11-04 21:36:08| National Hurricane Center (East Pacific)
Issued at 100 PM PST Wed Nov 04 2020 000 WTPZ45 KNHC 042036 TCDEP5 Tropical Storm Odalys Discussion Number 5 NWS National Hurricane Center Miami FL EP202020 100 PM PST Wed Nov 04 2020 The center of Odalys has become easier to find this afternoon. A well-defined low-level center has become apparent on visible satellite imagery, about 50 nm southwest of the deepest convection. Despite this somewhat disheveled appearance, a series of ASCAT passes earlier this afternoon found winds of 35-40 kt in a band north of the center. Allowing for a bit of instrument undersampling, and blending the latest SAB and TAFB satellite estimates, the initial intensity was raised slightly to 40 kt for this advisory. Odalys continues to move northwestward this afternoon at 315/15 kt. The track forecast philosophy has remained largely unchanged. The storm will continue to head northwest in the short-term, situated between a deep-layer ridge over Mexico and a mid to upper-level trough located to its northeast. This same trough will likely generate high enough vertical wind shear to cause the low and mid level centers of Odalys to completely separate in the next 24 h, resulting in the low-level center of Odalys to bend west and then west-southwest as it comes under the influence of the low-level easterly trade winds. The latest track guidance is in good agreement on this evolution with only minor speed differences after Odalys becomes a shallow vortex and only small adjustments were made to the official forecast track. Odalys may maintain its current intensity over the next 12 h if it is able to maintain active downshear convection. Thereafter, the southwesterly vertical wind shear is forecast to increase above 35 kt in the latest GFS-based SHIPS guidance. This should import very dry mid-level air near the center and will likely choke off any remaining convective bursts. Odalys is expected to become a shallow remnant low on Friday afternoon, if not sooner. FORECAST POSITIONS AND MAX WINDS INIT 04/2100Z 17.7N 120.7W 40 KT 45 MPH 12H 05/0600Z 18.3N 122.1W 40 KT 45 MPH 24H 05/1800Z 18.8N 123.6W 35 KT 40 MPH 36H 06/0600Z 18.7N 125.2W 30 KT 35 MPH 48H 06/1800Z 18.0N 126.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 60H 07/0600Z 17.2N 127.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 07/1800Z 16.3N 128.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 08/1800Z...DISSIPATED $$ Forecaster Papin/Zelinsky
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