Question: An EF4 tornado touched down near which county in Kansas on May 18th?
Context: The tornado outbreak of May 18–21, 2013 was a significant tornado outbreak that affected parts of the Midwestern United States and lower Great Plains.  This event occurred just days after a deadly outbreak struck Texas and surrounding southern states on May 15.  On May 16, a slow moving trough crossed the Rockies and traversed the western Great Plains.  Initially, activity was limited to scattered severe storms; however, by May 18, the threat for organized severe thunderstorms and tornadoes greatly increased.  A few tornadoes touched down that day in Kansas and Nebraska, including an EF4 near Rozel, Kansas.  Maintaining its slow eastward movement, the system produced another round of severe weather nearby.  Activity significantly increased on May 19, with tornadoes confirmed in Oklahoma, Kansas, Iowa, Missouri, and Illinois.  In Oklahoma, two strong tornadoes, one rated EF4, caused significant damage in rural areas of the eastern Oklahoma City metropolitan area; two people lost their lives near Shawnee.  The most dramatic events unfolded on May 20 as a large EF5 tornado devastated parts of Moore, Oklahoma, killing 24 people.  Thousands of structures were destroyed, with many being completely flattened.  Several other tornadoes occurred during the day in areas further eastward, though the majority were weak and caused little damage. The Tornado of Rochelle–Fairdale, Illinois was an extremely violent and long-lived tornado that tore through the communities near Rochelle and in Fairdale, Illinois throughout the evening hours of April 9, 2015.  Part of a larger severe weather event that impacted the Central United States, the tornado first touched down in Lee County at 6:39 p.m. CDT (22:39 UTC).  It progressed through the counties of Ogle, DeKalb, and Boone before finally dissipating at 7:20 p.m. CDT.  Along the tornado's 30.14 mi (48.51 km) path, numerous structures were heavily damaged or destroyed, especially in the small town of Fairdale where two fatalities and eleven injuries were recorded.  A few well-constructed homes were swept completely away, indicative of peak winds near 200 mph (320 km/h), the upper bounds of an EF4 tornado.  A small zoo in Belvidere, Illinois also sustained damage from the tornado that evening. The 2006 Westchester County tornado was the strongest and largest tornado in the history of Westchester County, New York.  It touched down there on July 12, 2006 and traveled 13 mi into southwestern Connecticut during a 33-minute span through two states.  The tornado touched down at 3:30 p.m. EDT (19:30 UTC) on the shore of the Hudson River before becoming a waterspout and traveling 3 mi across the river.  Coming ashore, the tornado entered Westchester County and struck the town of Sleepy Hollow at F1 intensity.  After passing through the town, it intensified into an F2 tornado and grew to almost a quarter of a mile (400 m) in diameter.  The tornado continued through the county, damaging numerous structures, until it crossed into Connecticut at 4:01 p.m. EDT (20:01 UTC).  Not long after entering the state, it dissipated in the town of Greenwich at 4:03 p.m. EDT (20:03 UTC).  When the tornado entered Westchester County, it was the eighth known tornado to either touch down or enter the county since 1950. The tornado outbreak of April 9–11, 2011 was one of several tornado outbreaks in the U.S. to take place during the record month of April 2011.  Producing 43 tornadoes across five states, widespread damage took place; however, no fatalities resulted from the event due to timely warnings.  In Wisconsin, 16 tornadoes touched down, ranking this outbreak as the state's largest April event on record as well as one of the largest single-day events during the course of any year.  The strongest of these storms was an EF4 tornado that touched down south of Pocahontas, Iowa on April 9.  Between 0256 and 0257 UTC (9:56 and 9:57 pm CDT) that day, five tornadoes were on the ground simultaneously in Pocahontas County, Iowa, all of which were from one supercell thunderstorm. The November 2008 Carolinas tornado outbreak was a brief but deadly tornado outbreak which began shortly after midnight (local time), while many people were sleeping.  Most of the eight tornadoes that touched down were produced by two supercell thunderstorms over North Carolina.  At 12:25 a.m. EST, the National Weather Service issued a tornado watch for most of eastern North Carolina as the risk of tornadoes increased.  Not long after, the first tornado of the outbreak, an EF2, touched down in South Carolina.  Almost an hour later, the second tornado touched down in Robeson County, North Carolina.  Three other minor tornadoes, two EF0 and an EF1, touched down over the next two hours.  Around 3:10 a.m. EST, the first of two killer tornadoes touched down near Kenly, North Carolina.  The EF2 tornado destroyed a few homes and damaged several others.  Roughly 20 minutes later, an EF3 tornado touched down in Wilson County.  This tornado killed one person and injured a few others after destroying several homes.  Total damages from the outbreak amounted to $2.5 million, about half of which was a result of the EF3 tornado. On April 27, 2011, a very long-tracked EF4 tornado touched down in Pickens County, northeast of Pickensville, killing 13 people and injured 54 others along its 116 mi path. The tornado outbreak of February 28 – March 1, 2017 was a widespread and significant outbreak of tornadoes and severe weather that affected the Midwestern United States at the end of February 2017 and beginning of March.  Fueled by the combination of ample instability, strong wind shear, and rich low-level moisture, the event led to 72 confirmed tornadoes and thousands of other non-tornadic severe weather reports.  The most notable aspect of the outbreak was a long-tracked EF4 tornado—the first violent tornado of 2017 and the first violent tornado during the month of February since the 2013 Hattiesburg, Mississippi tornado—that tracked from Perryville, Missouri to near Christopher, Illinois, killing one person.  Three EF3 tornadoes were recorded during the event, including one that caused two fatalities in Ottawa, Illinois, one that caused a fatality near Crossville, and one that heavily damaged or destroyed homes in and around Washburn.  In addition to the deaths, 38 people were injured by tornadoes and an additional 30 were injured by non-tornadic impacts, mainly by fallen trees. Katie is a town in Garvin County, Oklahoma, United States.  The town is 69 mi south of Oklahoma City.  It was incorporated in 2004 and had a population of 348 at the 2010 census.  On May 9, 2016, an EF4 tornado touched down in the southern part of Katie and tracked to the east, causing one death and several injuries. The Anderson Hills tornado struck near Huntsville, Alabama on May 18, 1995, killing one person and causing extensive damage and devastation, including the destruction of the Anderson Hills subdivision.  It was rated an F4 when it made a direct hit on the subdivision.  The tornado touched down just northwest of Athens.  It tracked from that point through eastern Limestone County, through Harvest, Meridianville, and New Market in northern Madison County, Alabama, and ended near Princeton in northwest Jackson County, Alabama.  The strongest portion of the tornado's path was near Harvest in northwest Madison County around the Anderson Hills subdivision and the Huntsville Dragway, which is the reason it is usually referred to as the "Anderson Hills Tornado". Rozel is a city in Pawnee County, Kansas, United States.  As of the 2010 census, the city population was 156.
Answer: Pawnee County