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Tropical Storm Hanna Forecast Discussion Number 15
2020-07-26 16:45:44| National Hurricane Center (Atlantic)
Issued at 1000 AM CDT Sun Jul 26 2020 058 WTNT43 KNHC 261445 TCDAT3 Tropical Storm Hanna Discussion Number 15 NWS National Hurricane Center Miami FL AL082020 1000 AM CDT Sun Jul 26 2020 Surface observations and WSR-88D radar data from Brownsville, Texas, indicate that Hanna continues to weaken as it moves farther inland. The radar shows a couple of fairly well-defined bands of convection over the eastern semicircle and tropical-storm-force wind gusts have been reported at observing sites along the U.S./Mexico border within the past couple of hours. The initial intensity has been reduced to 40 kt, and is based primarily on recent observations and Doppler radar velocities. Hanna should continue to weaken quickly during the next 12-24 hours as it moves inland over Mexico. Hanna is forecast to become a tropical depression later today and dissipate over the mountainous terrain of Mexico by Monday night. Hanna is moving west-southwestward or 250/8 kt. The system is forecast to continue moving west-southwestward around the southern portion of a mid-level ridge over the central United States. The new NHC track forecast is similar to the previous advisory and lies near the various consensus aids. Key Messages 1. Tropical storm conditions are expected to persist into this afternoon near and to the east of the center of Hanna. 2. Heavy rainfall from Hanna has already produced numerous reports of flash flooding across south Texas. Additional heavy rainfall will continue to cause life-threatening flash flooding over south Texas and northern Mexico, and isolated minor to moderate river flooding in south Texas. 3. Storm surge along the Texas coast should continue to diminish today. FORECAST POSITIONS AND MAX WINDS INIT 26/1500Z 26.1N 99.7W 40 KT 45 MPH 12H 27/0000Z 25.5N 100.6W 30 KT 35 MPH...INLAND 24H 27/1200Z 25.0N 101.9W 25 KT 30 MPH...INLAND 36H 28/0000Z 24.9N 102.9W 20 KT 25 MPH...POST-TROP/INLAND 48H 28/1200Z...DISSIPATED $$ Forecaster Brown
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