A tornado occurred on August 10th at about 1:57 pm CST at the town of Meridian in eastern Logan County. The tornado was produced by a thunderstorm within in a squall line that formed in central Oklahoma during the afternoon of August 10th, and extended northeastward for about 75 miles. The tornado swept into the town from the southwest and produced damage to homes and buildings in Meridian. Two people were slightly injured and damage estimates to the buildings totaled $20,000.

Severe thunderstorms moving along an east-southeastward path in central Oklahoma produced tornadoes, damaging winds, hail and rain from southwestern Logan County, through northeastern Oklahoma County, and into southwestern Lincoln County. One of the tornadoes touched down at 3:45 pm CST about 8 miles southeast of Seward and near the intersection of U.S. Interstate Highway I-35 and the Logan/Oklahoma County line.

The tornado strengthened at about 4:05 pm CST and produced a swath of destruction that was 0.25 miles wide. The damage path was well defined by downed and twisted trees, and total destruction occurred to 2 homes, 4 barns, and 9 outbuildings, with lesser damage incurred by 10 homes and 7 buildings.

Four persons were injured when their car was picked up and carried 100 feet off of the U.S. Interstate Highway I-35. A second car in that vicinity was blown off the pavement. An oil derrick and pumping unit were destroyed along with 3 storage tanks, one of which was blown 1.5 miles away from its mountings.

The damage path of the tornado continued to just north of Arcadia, OK in Oklahoma County where 2 homes were heavily damaged. The path continued through open country and crossed the Turner Turnpike (U.S. Interstate Highway I-44) just south of Luther, OK. The tornado next leveled buildings on 2 farmsteads 7 miles southeast where a woman was fatally injured when it destroyed her mobile home.

Heavy damage was produced along the path for the next few miles until the tornado lifted 3 miles north of Luther. Hailstones of 1 to 2 inches were reported along the path of the storm.

A tornado touched down briefly in the southeastern part of Guthrie where it ripped a flat roof from the new wing of a 90-bed home for senior citizens in the 1900 block of East Perkins. Only 3 of the home's 73 residents received minor injuries even through the one-story structure received heavy damage and some people were completely covered by debris in their beds. Several branches were snapped from trees in the immediate area of the rest home. A swimming pool cover was ripped off of the pool, shingles were torn from rooftops, and few windows were smashed. Debris ripped from the rest home was found more than a half mile away to the east-northeast along U.S. Interstate Highway I-35. The storm also knocked telephone and utility services in a 5-block area.

This tornado picked up a mobile home southwest of Coyle in Logan County and moved it 110-150 feet to the west of its original location while the storm continued on in a northeasterly direction. Two people were slightly injured in the mobile home. A pilot flew over the storm path from east of Guthrie in Logan County to south of Stillwater in Payne County, and reported seeing several intermittent damage paths within that flightline.

A tornado touched down 10 miles southwest of Guthrie in Logan County and moved northeastward across Guthrie where it damaged a lumber yard, downed trees, and toppled utility lines. The tornado continued touching down intermittently to a point 4 miles east of Stillwater in Payne County. Several mobile homes were heavily damaged along its path, and the water tower in the town of Langston was damaged. Baseball to Grapefruit size hail accompanied the tornado and damages were estimated at $200,000.

Strong thunderstorm winds of 70-80 mph and a small tornado occurred about 9 miles south-southeast of Guthrie in southern Logan County. Eight mobile homes were completely destroyed and two sustained heavy damage. Minor damage occurred to several other residential structures. Twelve people received minor injuries, and all were located in the mobile homes. The total damage was estimated at $320,000.

A record outbreak of tornadoes struck Oklahoma from late afternoon of May 3, 1999, through early morning of May 4, 1999. A total of 58 tornadoes were recorded across portions of western and central Oklahoma of the NWS Norman, Oklahoma County Warning Area (CWA). An additional 5 tornadoes were reported across eastern Oklahoma from late evening of May 3rd through the early morning of May 4th, and are listed under the eastern Oklahoma portion of Storm Data, provided by the National Weather Service Office in Tulsa, Oklahoma.

All direct fatalities (40) and all direct injuries (675) occurred in the Norman National Weather Service warning area. The most notable tornado was rated F5 and formed over Grady County near Amber and tracked northeast for 37 miles eventually into the Oklahoma City metropolitan area. Bridge Creek, Oklahoma City, Moore, Del City, and Midwest City suffered tremendous damage. Thirty-six direct fatalities and 583 direct injuries were recorded. There were many other significant tornadoes as well, including F4 tornadoes in Kingfisher and Logan Counties, and F3 tornadoes in Caddo, Grady, Kingfisher, Logan, and Lincoln Counties. There were 8 tornadic producing thunderstorms, called supercells, and most of them spawned numerous tornadoes, one after another. Occasionally, these thunderstorms spawned tornadoes at the same time.

This violent tornado, which killed two people, was the last of 20 tornadoes produced by one cyclic supercell thunderstorm which moved over Caddo, Canadian, Kingfisher, Logan, Payne and Noble counties during the May 3, 1999 tornado outbreak. The tornado formed about 7 miles southwest of Crescent, OK and tracked northeast for 39 miles before dissipating east of Perry, OK in Noble County.

A very unusual event took place in Logan County where this tornado, and a second tornado produced by another supercell thunderstorm about 80 minutes later, affected much of the same area between Crescent and Mulhall, OK in Logan County. Assessment of damage from the individual tornadoes was difficult, and in some areas nearly impossible, due to overlapping damage paths.

Damage from the tornado was first observed about 2 miles west of the intersection of OK State Highway 33 and OK State Highway 74 near Twin Lakes Road, where 2 homes and other businesses were damaged. The width of damage is believed to have increased to nearly 1 mile as it tracked east of Crescent where numerous homes suffered major damage. Damage to 1 brick residence 3 miles east-southeast of Crescent was rated F4. All walls were knocked down, and part of the foundation was removed.

The tornado then tracked through the small community of Abell, OK (6 miles southwest of Mulhall, OK), where 1 woman was killed in her home, and 6 people were injured, and then finally through Mulhall. Approximately 60%-70% of Mulhall's 130 homes were severely damaged or destroyed. In addition, Mulhall's primary water source, a water tower, and the Mulhall/Orlando Elementary School were destroyed.

Lesser damage continued to about ½ mile west of the Logan/Payne County border where tombstones and fences were blown over. Along U.S. Interstate Highway I-35 in northwest Payne County, a semi-truck trailer was overturned, and 2 cars were flipped. The driver of one of the cars was killed when his vehicle, parked under the U.S. Interstate Highway I-35 overpass at mile-marker 176.5, was picked up and dropped on its top.

In Noble County, the tornado produced major structural damage in the Boonsboro Addition, a mobile home park located along OK State Highway 86, 6 miles south of Perry. Approximately 20 mobile homes were destroyed, and dozens of others were damaged. Damage continued northward to a location 3 miles east of Perry, where 3 homes suffered major damage on U.S. Highway 64 and 1 critical injury was reported. In total, approximately 25 homes were destroyed in Noble County, and 50 homes were damaged. Total damage was estimated at $13.1 million.

This tornado formed about 2.5 miles south of Crescent and tracked northeast for 13 miles before dissipating 4 miles southwest of Mulhall. Twenty-five homes were destroyed near Crescent, and 30 homes were damaged. Damage here is believed to have been produced by this tornado as well as a violent F4 tornado which occurred 80 minutes earlier. Near the end of this tornado track, along portions of EW68 Road and EW69 Road, another house received significant roof damage.

This tornado began very close to the Caddo/Canadian County border and quickly became a strong/violent tornado. The tornado destroyed numerous trees, many of which were debarked, before crossing U.S. Interstate Highway I-40. Three people died in vehicles near the U.S. Interstate Highway I-40 Calumet exit, and two other fatalities occurred just northeast of that location. Cars were thrown thousands of feet off the roadways. It is believed that the tornado reached its maximum intensity just after crossing U.S. Interstate Highway I-40, and it was here that a mobile radar measured winds of greater than 210 mph just off the surface.

The tornado side-swiped the El Reno Oklahoma Mesonet station (located 5 miles west of El Reno, OK) along its path, and the site measured wind gusts of 131 and 151 mph. From this location, the tornado continued northeast, narrowly missing the town of Piedmont, OK. Widespread EF-3, occasional EF-4 damage occurred between El Reno and Piedmont. More widespread EF-4 damage was seen west and north of Piedmont. Especially hard hit was the Falcon Lake neighborhood, near the Kingfisher County border. Two children were killed at this location.

The tornado entered far southeast Kingfisher County before moving into Logan County. However, EF-3 damage occurred just over the Kingfisher County border, debarking trees and significantly damaging buildings. As the tornado continued northeast, the damage was mainly considered EF-2, with damage to mostly outbuildings and trees. The tornado then continued into Logan County.

The tornado moved into Logan County and resulted in two additional fatalities (both of whom were outside when the tornado struck) near Cashion, OK. The tornado destroyed several manufactured homes (both double and single-wide) after entering Logan County. Large high-transmission line tresses collapsed. Trees were debarked with only stumps remaining. Several buildings had most of their exterior walls collapse, with only the inner walls remaining. EF-2 to occasionally EF-3 damage occurred as the tornado neared Guthrie, OK. Luckily, most of the town of Guthrie was spared to the tornado as it moved west and then north of the center of the city. Finally, the tornado dissipated northeast of Guthrie with some minor tree damage. The tornado’s path total path length was 63 miles, and it was on the ground for nearly one hour and 45 minutes. This was the first EF-5 tornado to occur in Oklahoma since the Enhanced Fujita Scale was adopted by the National Weather Service in 2007.

A moist and very unstable airmass was in place over the eastern two thirds of Oklahoma, to the east of a dryline. Additionally, strong wind shear was present as a mid-level jet streak carved into the southern Plains. Several supercells developed along the dryline during the mid and late afternoon hours, producing large hail. Two supercells in central Oklahoma also produced tornadoes, including a few significant, damaging tornadoes.

This tornado touched down just south of Triple XXX Road and Coffee Creek Road to the northwest of Luther and began to move east-northeast. The tornado began producing EF2 damage soon after crossing Luther Road where an outbuilding was destroyed. At least two mobile homes were destroyed as the tornado continued to the east-northeast. The tornado crossed Waterloo Road and moved into Logan County.

Tornado continued tracking northeast, producing tree damage as it clipped the extreme southeastern corner of Logan County before moving into Lincoln County. The large tornado continued to move northeast from Logan County into Lincoln County. The tornado passed just southeast of Fallis and then clipped the southeastern portion of Carney. It produced EF3 damage to a number of homes from just south of Carney into the southeast portion of the town. The tornado finally dissipated about 3 miles southeast of Tryon. Motions observed visually in this tornado suggest that the tornado was likely stronger than EF3 in western Lincoln County, but no damage indicators were available that would have supplied a rating higher than EF3 in this area.