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Tropical Storm Mario Forecast Discussion Number 13
2019-09-20 16:55:45| National Hurricane Center (East Pacific)
Issued at 900 AM MDT Fri Sep 20 2019 000 WTPZ44 KNHC 201455 TCDEP4 Tropical Storm Mario Discussion Number 13 NWS National Hurricane Center Miami FL EP142019 900 AM MDT Fri Sep 20 2019 Microwave imagery since the last advisory indicates that Mario has been able to maintain its low-level structure, but deep convection is mostly displaced to the southwest of the cyclone's surface center. This may be a sign that northeasterly shear has again increased across Mario, at least for the moment. The intensity estimate is still 55 kt based on Dvorak current intensity estimates from TAFB and SAB, but objective values are lower. Almost no change was made to the NHC intensity forecast. SHIPS diagnostics from the GFS and ECMWF indicate that substantial northeasterly shear will continue to affect Mario for the next couple of days, and by the time the shear relaxes early next week, the cyclone will have reached much cooler waters. Given that Mario is in better shape than it was a day ago, some slight strengthening is still shown in the short-term forecast, but only the GFS explicitly forecasts Mario to reach hurricane strength. Nearly all of the dynamical models forecast that Mario will lose its convection and become a remnant low by 96 h or sooner, and this is reflected in the NHC forecast. The track forecast is very low confidence, evidenced by the fact that the deterministic GFS and ECMWF are both outliers from their respective ensembles run at the same time. In fact, both models are outside of their associated guidance envelope and show Mario getting very near the southern tip of the Baja California peninsula in a couple of days. There is still considerable uncertainty as to how much Mario and Lorena will interact during the next 2 or 3 days. The NHC forecast continues to keep the two systems separate, showing both systems moving generally northwestward in tandem at 48 h and beyond. However, given the close proximity of the two cyclones, a merger can not be ruled out. The NHC forecast has been shifted to the right of the previous forecast, and lies near the middle of the GFS and ECMWF ensemble envelopes. Significant changes may still be required to the track forecast later today, and there is still a chance that Mario could directly affect portions of the Baja California peninsula. FORECAST POSITIONS AND MAX WINDS INIT 20/1500Z 17.9N 110.1W 55 KT 65 MPH 12H 21/0000Z 18.6N 110.0W 60 KT 70 MPH 24H 21/1200Z 19.8N 110.7W 55 KT 65 MPH 36H 22/0000Z 21.1N 112.1W 50 KT 60 MPH 48H 22/1200Z 22.3N 113.8W 45 KT 50 MPH 72H 23/1200Z 25.0N 116.6W 30 KT 35 MPH 96H 24/1200Z 26.0N 118.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 25/1200Z 25.0N 120.5W 20 KT 25 MPH...POST-TROP/REMNT LOW $$ Forecaster Zelinsky
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Category:Transportation and Logistics