In its first advisory on the re-developed cyclone, the National Hurricane Center classified the system Ivan "after considerable and sometimes animated in-house discussion of [its demise]... in the midst of a low-pressure and surface frontal system over the eastern United States... based primarily on the reasonable continuity observed in the analysis of the surface and low-level circulation." Despite unfavorable shear and its disorganized cloud structure, the cyclone intensified to tropical storm status early on September 23, based on reports by Hurricane Hunters. As an area of deep convection developed over the center, Ivan reached winds of 60 mph (95 km/h), though the winds decreased as thunderstorm activity diminished. Ivan weakened to a tropical depression at 0000 UTC on September 24, and two hours later it moved ashore near Holly Beach, Louisiana. Initial computer models forecast the low-level circulation to turn southwestward and re-emerge into the Gulf of Mexico. However, the storm rapidly weakened over land, and by 1200 UTC on September 24, Ivan degenerated into a remnant low pressure area over southeast Texas. The low turned to the south and the circulation dissipated early on September 25. The remnant trough reached the northwestern Gulf of Mexico later that day, briefly producing scattered thunderstorms before it diminished. Reaching Category 3 status on the Saffir–Simpson Hurricane Scale at 10.2° N, Ivan became the southernmost major hurricane on record. Additionally, the hurricane attained Category 4 status further south than any other North Atlantic hurricane, at 10.6° N. At the time, Ivan was the sixth-most intense Atlantic hurricane on record; it has since dropped to eleventh. Throughout its duration, Ivan maintained winds of major hurricane status or greater for a total of 10 days, establishing an Atlantic hurricane record. Lasting as a tropical cyclone for a total of 450 hours, Ivan was the tenth-longest-tracked Atlantic hurricane on record. Upon making its two landfalls in the United States, the hurricane spawned a total of 120 tornadoes, which is the largest tornado outbreak associated with a tropical cyclone; this broke the previous record of 115 set by Hurricane Beulah in 1967.