Prior to 1990, there is a likely undercount of tornadoes, particularly F0–1, with reports of weaker tornadoes becoming more common as population increased. A sharp increase in the annual average F0–1 count by approximately 200 tornadoes was noted upon the implementation of
NEXRAD Doppler weather radar in 1990–1991. 1974 marked the first year where significant tornado (F2+) counts became homogenous with contemporary values, attributed to the consistent implementation of
Fujita scale assessments.
Fort Smith, Arkansas Part of a long-lived tornado family, this event may have first damaged trees near the
Arkansas River in Oklahoma, beginning near Cache Creek. Intermittent damage to vegetation continued past the
Poteau River. The tornado was confirmable at the
Fort Smith National Cemetery, where it leveled a , stretch of masonry, downed trees, and severely damaged a lodge. Farther on, it extensively damaged a schoolhouse. The tornado then tracked into the
business district of Fort Smith, causing scores of fatalities. "Dozens" of businesses and residences were flattened, some homesites being left bare. At city hall, 40 large trees, up to tall, were felled, and an iron flagstaff, embedded in
granite and fastened by
guy wires, was pulled out, the wires being snapped. A brick wall, thick and tall, was leveled. A three-story brick building was moved off its foundation, and 30 homes in town, mostly frame, were destroyed, along with a quartet of churches. 130 other homes of similar composition were damaged. An iron beam, driven into a brick wall, could not be dislodged, clothing was found away, and signage from Fort Smith was carried . Initial reports indicated that 33 people died instantly, while 18 later succumbed of injury. Of the 113 injuries, 44 were severe, 73 minor. Final tabulations totaled 55 dead and 113 injured, including three dead near Van Buren, where rural farmsteads were wrecked. ==Notes==