Tropical Storm Boris Discussion Number 9

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Tropical Storm Boris Discussion Number 9 NWS National Hurricane Center Miami FL EP022026 300 AM CST Tue Jun 09 2026 Organized convection associated with Boris began falling apart about 12 hours ago, and now there is barely any organized convection remaining. It is quite difficult to estimate where the low-level center is, and there have been no recent microwave images, scatterometer data, or nearby surface observations. Based on the GOES proxy vis imagery, it is estimated that the center of Boris has moved inland along the border of Oaxaca and Guerrero. The initial intensity has been brought down to 35 kt which could be generous, and is in good agreement with a blend of the latest subjective and objective satellite intensity estimates. The current motion is estimated to be north-northwest at 5 kt. A turn to the northwest is expected shortly as a mid-level ridge builds over the western Gulf of America, and little change has been made to the NHC track forecast. Model guidance is in good agreement showing rapid weakening and dissipation occurring over land very soon. The NHC forecast indicates weakening to a remnant low by midday today with dissipation by hour 24, although it is possible that Boris could dissipate sooner. The threat of heavy rainfall continues to be the primary hazard of concern with this slow-moving system, which will likely result in flash flooding and mudslides in mountainous terrain through this morning. Key Messages: 1. Heavy rainfall associated with Tropical Storm Boris across portions of southern Mexico will subside by later today. Some risk of additional flooding and mudslides continues this morning, especially in areas of steep terrain. 2. Tropical storm conditions are likely occurring along the coast within the Tropical Storm Warning area and will continue through early this morning. FORECAST POSITIONS AND MAX WINDS INIT 09/0900Z 16.4N 98.4W 35 KT 40 MPH 12H 09/1800Z 17.1N 99.1W 25 KT 30 MPH...POST-TROP/INLAND 24H 10/0600Z...DISSIPATED