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Tropical Storm Mario Forecast Discussion Number 14
2019-09-20 22:46:50| National Hurricane Center (East Pacific)
Issued at 300 PM MDT Fri Sep 20 2019 000 WTPZ44 KNHC 202046 TCDEP4 Tropical Storm Mario Discussion Number 14 NWS National Hurricane Center Miami FL EP142019 300 PM MDT Fri Sep 20 2019 A resumption of northeasterly shear has caused the center of Mario to peak out to the northeast of its convective canopy. This is the second day in row that the low-level center of Mario has become exposed after it developed a low- to mid-level eye in microwave imagery the previous night. ASCAT data from shortly before 1800 UTC showed maximum winds around 50 kt, so the intensity estimate is still 55 kt, assuming a little undersampling has occurred. All of the intensity guidance indicates that Mario has already peaked and should only weaken from now on. Given how the last few nights have gone, I am not confident that Mario will weaken as quickly as the models suggest, but it does seem likely that steady weakening will begin by tomorrow afternoon, if not sooner. The tropical storm will reach some very cold water by 72 h, and it is forecast to become a remnant low at that time. The official intensity forecast is slightly lower than the previous one, but it is above most of the guidance for the first 72 h. The track forecast remains highly uncertain, especially beyond 24 h. The guidance spread is a little lower than it was before, but the run-to-run consistency is still quite low. In general, the models are calling for less binary interaction between Mario and Lorena, with Mario simply lifting northward to north-northeastward in Lorena's wake. As a result, Mario is now forecast by most of the models to move closer to the Baja California peninsula than it was before. The NHC track forecast has been adjusted substantially to the east beyond 24 h accordingly, and there remains a distinct chance that Mario will directly affect portions of the Baja California peninsula. FORECAST POSITIONS AND MAX WINDS INIT 20/2100Z 18.0N 110.0W 55 KT 65 MPH 12H 21/0600Z 18.7N 110.1W 55 KT 65 MPH 24H 21/1800Z 19.8N 110.6W 50 KT 60 MPH 36H 22/0600Z 21.0N 111.3W 40 KT 45 MPH 48H 22/1800Z 22.6N 112.3W 35 KT 40 MPH 72H 23/1800Z 25.3N 114.5W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 24/1800Z 26.5N 116.0W 20 KT 25 MPH...POST-TROP/REMNT LOW 120H 25/1800Z...DISSIPATED $$ Forecaster Zelinsky
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