the area as well. The storms weakened and dissipated that night, but another severe weather event was expected in Arizona beginning early the next day. Large hail and damaging winds were expected to be the primary hazards, although an isolated tornado threat was also noted. However, environmental conditions were more favorable for the development of tornadic supercells than expected. As a result, a round of supercells formed and produced a tornado outbreak that struck northern Arizona and southern Utah, an extremely rare occurrence for an area west of the Rocky Mountains. The most significant damage was in Bellemont, Arizona, which was struck by three tornadoes in short succession. The first and third one were rated EF2 while the second one was rated EF3. Throughout the town, houses and businesses were significantly damaged, a train was derailed and Camp Navajo was heavily damaged. The first EF2 tornado also caused all seven of the tornadic injuries that occurred during the outbreak. Other tornadoes touched down, but primarily remained over the open mountainous terrain in the very sparsely populated area. However, one other EF3 tornado touched down on the Navajo Nation and destroyed three metal transmission towers, one of which was flattened. Although the exact track length of this tornado is unknown given that it passed over an very rural area, it and the other EF3 tornado that day were among the strongest tornadoes ever recorded west of the Rockies. October 21 (Argentina) A tornado touched down in Formosa Province, Argentina and struck the town of Pozo del Tigre, killing six people and injuring 116. An estimated 70% to 80% of the town lost power. October 24–27 A developing intense low pressure system resulted in an unstable air mass over parts of the Southern United States on October 24. The most intense tornado hit Rice, Texas, where a high school was heavily damaged and several people were reported to be injured. That tornado was rated as an EF2. Another notable tornado, an EF1, hit Mobile, Alabama, early on October 25. As the low explosively deepened to become the most intense extratropical low of non-tropical origins ever recorded in the continental United States, reaching as low as 955 mbar (28.20 inHg) over northern Minnesota (as low as a medium-sized Category 3 hurricane), storms developed on the associated cold front late on October 25. A high risk of severe storms, the first to be issued