Moore has a
humid subtropical climate (
Köppen:
Cfa) with frequent variations in weather during part of the year and consistently hot summers. Prolonged and heavy rainfall often leads to flash flooding. Consistent winds, usually from the south or south-southeast during the summer, help temper the hotter weather. Consistent northerly winds during the winter can intensify cold periods. Severe
ice storms and
snowstorms happen sporadically during the winter. {{Weather box
Tornado history The
Oklahoma City metropolitan area (of which Moore is a part) is located in
Tornado Alley and is subject to frequent and severe tornadoes and hailstorms, making it one of the most tornado-prone major metropolitan areas in the world. Due to this, Moore is sometimes considered the
Tornado Capital of either the United States or the world. Moore itself has seen nine tornadoes between 1998 and 2015, three of them big enough to claim lives and cause catastrophic damage. The city of Moore was damaged by significant tornadoes on
October 4, 1998;
May 3, 1999;
May 8, 2003;
May 10, 2010; and
May 20, 2013, with weaker tornadoes striking at other times, notably
May 31, 2013 and
March 25, 2015. Moore is located in
Tornado Alley, a colloquial term for the area of the United States where tornadoes are most frequent. About 20 tornadoes occurred in the immediate vicinity of Moore from 1890 to 2013. The most significant tornadoes to hit Moore occurred in 1893, 1999, and 2013. To warn residents of tornadoes, 44
outdoor warning sirens have been densely installed throughout Moore.
1999 tornado During
the tornado outbreak on May 3, 1999, a tornado hit Moore and nearby areas. The tornado, which was rated an F5 on the
Fujita scale, was the most costly tornado in history at the time (not adjusted for changes in inflation and population). The tornado had an approximate recorded wind speed of as sampled by
mobile Doppler radar, the highest
wind speed ever recorded on Earth. It left a swath of destruction over wide at times, and long. It killed a total of 36 people in the Oklahoma City metropolitan area.
2013 tornado On May 20, 2013, parts of Moore and neighboring
Newcastle and southern
Oklahoma City, were affected by a violent tornado. Classified as
EF5 on the Enhanced Fujita scale, it had estimated wind speeds of , a maximum width of , and a path length of . Entire subdivisions were destroyed; the tornado struck
Briarwood and
Plaza Towers elementary schools in Moore while school was in session. The Oklahoma Medical Examiner's office reported that 24 people were killed, including 10 children. Over 140 patients, including at least 70 children, were treated at hospitals following the tornado. It was the deadliest U.S. tornado since the
Joplin, Missouri tornado that killed 158 people in 2011. ==Demographics==