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Tropical Storm Henriette Forecast Discussion Number 3
2019-08-12 16:33:30| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Mon Aug 12 2019 000 WTPZ44 KNHC 121433 TCDEP4 Tropical Storm Henriette Discussion Number 3 NWS National Hurricane Center Miami FL EP092019 900 AM MDT Mon Aug 12 2019 Henriette is a sheared tropical cyclone, with microwave and first-light visible satellite imagery revealing a low level center that is near the northeastern edge of the deep convection. The overall presentation of the cyclone has changed little over the past several hours, and therefore the initial intensity is being held at 35 kt. This is in agreement with an earlier ASCAT pass showing a very small area of 30-35 kt winds over the northwestern portion of the circulation. The initial motion is 295/10 kt. Henriette is expected to continue this general motion for the next 24 hours as it is steered by a mid-level ridge that extends from northern Mexico to the north of the cyclone. A turn to the west is expected on Tuesday as the system weakens and becomes steered by the low-level flow. The official forecast is slightly south of the previous one through 24 hours, due to a more southward initial position. Beyond 24 hours, the official forecast is very near the previous one, and near the middle of the consensus aids. Northeasterly shear and dry air over the northern portion of the cyclone should continue to keep the low level center near the edge of the deep convection into tonight, preventing any further strengthening. By 24 hours, the cyclone is forecast to cross the 26 C SST isotherm and move into a more stable airmass. This should cause the cyclone to lose its convection and weaken on Tuesday, with the system likely becoming a remnant low by Tuesday night. The official intensity forecast is close to the previous one, and is in agreement with the various dynamical and consensus aids. FORECAST POSITIONS AND MAX WINDS INIT 12/1500Z 19.7N 112.2W 35 KT 40 MPH 12H 13/0000Z 20.2N 113.9W 35 KT 40 MPH 24H 13/1200Z 20.9N 116.1W 30 KT 35 MPH 36H 14/0000Z 21.4N 118.8W 25 KT 30 MPH...POST-TROP/REMNT LOW 48H 14/1200Z...DISSIPATED $$ Forecaster Latto/Pasch
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