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Tropical Storm Henriette Forecast Discussion Number 5
2019-08-13 04:50:35| National Hurricane Center (East Pacific)
Issued at 900 PM MDT Mon Aug 12 2019 000 WTPZ44 KNHC 130250 TCDEP4 Tropical Storm Henriette Discussion Number 5 NWS National Hurricane Center Miami FL EP092019 900 PM MDT Mon Aug 12 2019 Scatterometer data and visible satellite imagery indicate that Henriette has maintained a robust, compact low-level circulation despite the pulsing convection. In fact, three earlier ASCAT passes between 1613Z and 1728Z indicated reliable wind speeds of 37-38 kt, suggesting that Henriette could have been near 40 kt prior to those times. However, since 1800Z, northeasterly vertical wind shear and dry air intrusions have reduced and confined the overall convective pattern to just intermittent bursts in the southwestern quadrant. The initial intensity is being maintained at 35 kt based on the shear pattern, a UW-CIMSS ADT intensity estimate of T2.4/34 kt, and allowing for some slight spin down of the low-level vortex. The initial motion remains 290/11 kt. A west-northwestward motion is forecast to continue for the next 24 hours so, followed by a turn toward the west by early Wednesday as the weakening cyclone becomes vertically shallow and gets steered by the low-level easterly tradewind flow. The new NHC forecast track remains essentially unchanged and is just an extension of the previous advisory, and lies about midway between the consensus models HCCA and TVCE. Although the official intensity forecast calls for steady weakening, it is possible that Henriette could remain a tropical storm in 12 h due to the cyclone coming out of the convective maximum period and still located over SSTs between 26C and 26.5 deg C. However, by 18 h and beyond, the cyclone will be moving over sub-26C SSTs and into a drier environment, which is expected to result in significant weakening, with Henriette degenerating into a remnant low by late Tuesday and dissipating by late Wednesday. The official intensity forecast is identical to previous advisory and closely follows the IVCN and HCCA consensus intensity forecast models. FORECAST POSITIONS AND MAX WINDS INIT 13/0300Z 20.7N 114.3W 35 KT 40 MPH 12H 13/1200Z 21.2N 116.0W 30 KT 35 MPH 24H 14/0000Z 21.8N 118.4W 25 KT 30 MPH...POST-TROP/REMNT LOW 36H 14/1200Z 22.3N 121.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 48H 15/0000Z...DISSIPATED $$ Forecaster Stewart
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