Tropical Storm Rafael Forecast Discussion Number 27
Issued at 900 PM CST Sat Nov 09 2024 000 WTNT43 KNHC 100232 TCDAT3 Tropical Storm Rafael Discussion Number 27 NWS National Hurricane Center Miami FL AL182024 900 PM CST Sat Nov 09 2024 Rafael remains sheared this evening, with the remaining convection located to the northeast of the exposed low-level center. The circulation center itself is broad and appears to have multiple small vorticity center embedded in it. The initial intensity is decreased to 40 kt based on a blend of the various subjective and objective satellite intensity estimates. These winds are likely occurring in the area of convection northeast of the center and northwest of buoy 42001. The initial motion is now a slow 325/3. during the next 36 h or so, Rafael should make a small clockwise loop over the central Gulf of Mexico. After that time, the low-level flow should steer the cyclone or its remnants southward and southwestward. One change in the track guidance is that that the GFS and HWRF models turn the system move westward after 60 h and wind up to the north of the rest of the guidance. Overall, the new forecast track is little changed from the previous track and lies near the consensus models. Rafael should continue to weaken due to a combination of southwesterly shear and dry air entrainment. Simulated satellite imagery from the GFS and ECMWF continue to indicate that the associated convection will dissipate between 24-36 h, with the circulation becoming elongated. Based on this, the intensity forecast calls for the cyclone to degenerate to a remnant low pressure area by 36 h, with final dissipation by 120 h as suggested by most of the global models. The new intensity forecast has only minor tweaks from the previous forecast. Rafael poses no direct threat to land, but swells from the storm are still contributing to an elevated rip current risk along the northern and western Gulf Coast. Also, the interaction of distant moisture from Rafael with a slow-moving front will cause heavy rainfall and potentially significant flash flooding across portions of Southwest and Central Louisiana through Sunday morning. Key Messages: 1. Swells generated by Rafael are likely to cause life-threatening surf and rip current conditions along the Gulf Coast through the weekend. FORECAST POSITIONS AND MAX WINDS INIT 10/0300Z 25.7N 91.7W 40 KT 45 MPH 12H 10/1200Z 26.0N 91.8W 35 KT 40 MPH 24H 11/0000Z 26.0N 91.5W 35 KT 40 MPH 36H 11/1200Z 25.3N 91.4W 30 KT 35 MPH...POST-TROP/REMNT LOW 48H 12/0000Z 24.0N 91.8W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 12/1200Z 22.8N 92.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 13/0000Z 22.2N 93.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 14/0000Z 21.4N 95.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 15/0000Z...DISSIPATED $$ Forecaster Beven
Issued at 900 PM CST Sat Nov 09 2024
000 WTNT43 KNHC 100232 TCDAT3 Tropical Storm Rafael Discussion Number 27 NWS National Hurricane Center Miami FL AL182024 900 PM CST Sat Nov 09 2024 Rafael remains sheared this evening, with the remaining convection located to the northeast of the exposed low-level center. The circulation center itself is broad and appears to have multiple small vorticity center embedded in it. The initial intensity is decreased to 40 kt based on a blend of the various subjective and objective satellite intensity estimates. These winds are likely occurring in the area of convection northeast of the center and northwest of buoy 42001. The initial motion is now a slow 325/3. during the next 36 h or so, Rafael should make a small clockwise loop over the central Gulf of Mexico. After that time, the low-level flow should steer the cyclone or its remnants southward and southwestward. One change in the track guidance is that that the GFS and HWRF models turn the system move westward after 60 h and wind up to the north of the rest of the guidance. Overall, the new forecast track is little changed from the previous track and lies near the consensus models. Rafael should continue to weaken due to a combination of southwesterly shear and dry air entrainment. Simulated satellite imagery from the GFS and ECMWF continue to indicate that the associated convection will dissipate between 24-36 h, with the circulation becoming elongated. Based on this, the intensity forecast calls for the cyclone to degenerate to a remnant low pressure area by 36 h, with final dissipation by 120 h as suggested by most of the global models. The new intensity forecast has only minor tweaks from the previous forecast. Rafael poses no direct threat to land, but swells from the storm are still contributing to an elevated rip current risk along the northern and western Gulf Coast. Also, the interaction of distant moisture from Rafael with a slow-moving front will cause heavy rainfall and potentially significant flash flooding across portions of Southwest and Central Louisiana through Sunday morning. Key Messages: 1. Swells generated by Rafael are likely to cause life-threatening surf and rip current conditions along the Gulf Coast through the weekend. FORECAST POSITIONS AND MAX WINDS INIT 10/0300Z 25.7N 91.7W 40 KT 45 MPH 12H 10/1200Z 26.0N 91.8W 35 KT 40 MPH 24H 11/0000Z 26.0N 91.5W 35 KT 40 MPH 36H 11/1200Z 25.3N 91.4W 30 KT 35 MPH...POST-TROP/REMNT LOW 48H 12/0000Z 24.0N 91.8W 30 KT 35 MPH...POST-TROP/REMNT LOW 60H 12/1200Z 22.8N 92.6W 25 KT 30 MPH...POST-TROP/REMNT LOW 72H 13/0000Z 22.2N 93.7W 25 KT 30 MPH...POST-TROP/REMNT LOW 96H 14/0000Z 21.4N 95.2W 25 KT 30 MPH...POST-TROP/REMNT LOW 120H 15/0000Z...DISSIPATED $$ Forecaster Beven
