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Tropical Storm Polo Forecast Discussion Number 7
2020-11-19 09:48:07| National Hurricane Center (East Pacific)
Issued at 100 AM PST Thu Nov 19 2020 000 WTPZ41 KNHC 190848 TCDEP1 Tropical Storm Polo Discussion Number 7 NWS National Hurricane Center Miami FL EP212020 100 AM PST Thu Nov 19 2020 Polo has been devoid of deep convection near the center for more than 6 hours. However, a narrow band of convection with cloud tops to -60 to -70 deg C has recently developed in the northeastern quadrant 30-40 nmi from the center, in the same location where a 0439Z partial ASCAT-B scatterometer pass indicated a few surface wind vectors of 34-35 kt. Therefore, Polo is being maintained as a tropical storm with an intensity of 35 kt for this advisory. The initial motion estimate is now 280/10 kt. A low-/mid-level ridge situated to the north of Polo should steer the small cyclone generally westward until it dissipates in a day or two. The new NHC track forecast is similar to but a tad south of the previous advisory track, and lies close to the tightly packed consensus models TVCE, GFEX, and NOAA-HCCA. Over the next two days, Polo is forecast to move into a less favorable environment consisting of moderate-to-strong westerly shear, a drier and more stable air mass, and sea-surface temperatures less than 26 deg C. As a result, convection should steadily weaken, causing Polo to gradually spin down and become a remnant low by this afternoon or tonight, and dissipate by 60 hours, if not sooner. The official intensity forecast is similar to the previous advisory, and closely follows the intensity consensus models IVCN and HCCA. FORECAST POSITIONS AND MAX WINDS INIT 19/0900Z 17.1N 119.3W 35 KT 40 MPH 12H 19/1800Z 17.1N 120.9W 30 KT 35 MPH 24H 20/0600Z 17.1N 123.0W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 20/1800Z 17.0N 125.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 21/0600Z 16.6N 128.1W 20 KT 25 MPH...POST-TROP/REMNT LOW 60H 21/1800Z...DISSIPATED $$ Forecaster Stewart
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