| Tornado outbreak sequence of June 20–23, 1957 | |
| Active: | June 20–23, 1957 |
| Lowest Pressure: | 998 |
| Tornadoes: | 23 |
| Fujitascale: | F5 |
| Tornado Duration: | 4 days |
| Highest Winds: | 115mph (Downtown Kansas City) |
| Hail: | 4.5inches (northeast of Fort Stockton, Texas) |
| Casualties: | 11 fatalities, 105 injuries |
| Damages: | $25.883 million (1957 USD)[1] |
| Enhanced: | no |
| Partof: | the tornado outbreaks of 1957 |
A deadly and destructive outbreak sequence of 23 tornadoes struck parts of the Great Plains and the Great Lakes in late-June 1957. At least seven significant tornadoes (F2+) touched down during the outbreak sequence. The most devastating storm was a large, violent, and catastrophic 500-yard-wide F5 tornado family that struck Fargo, North Dakota on Thursday, June 20, 1957, killing 10 people and becoming the deadliest tornado ever recorded in North Dakota. The outbreak caused 11 fatalities, 105 injuries, and $25.883 million in damage.
On June 20, 1957, a combination of strong instability and vertical wind shear, high storm-relative helicity (SRH), favorable storm-relative flow (SRF), and lowered lifted condensation levels (LCLs) set up over the High Plains. Boundary-layer moisture was also present, which was enhanced via evapotranspiration (ET) and moisture convergence. A shortwave ridge then centered itself over the region and, despite only modest forcing, a trough spawned a low-pressure area over Southwestern North Dakota. It then moved northeastward into the central part of the state, where temperatures and dewpoints were in the lower 80s and lower 70s respectfully. Although bulk shear was not quite high enough to support long-tracked supercells, meteorologist did indicate that an outbreak of severe thunderstorms along with a significant to violent tornado or two was possible.
That afternoon, a thunderstorm complex over Devil's Lake, North Dakota produced an outflow boundary that further enhanced the low-level convergence zone in Eastern North Dakota and Western Minnesota. An isolated supercell formed in the warm sector of the low pressure system and took advantage of this favorable environment, dropping five tornadoes, including the F5 tornado in Fargo (although the tornado family has been listed as one tornado). Four other tornadoes were confirmed on that day, although most were brief, but some were strong as well.[2]
| F# | Location | County / Parish | State | Start | Time (UTC) | Path length | width | Summary | ||
|---|---|---|---|---|---|---|---|---|---|---|
| bgcolor=# | F2 | S of Oake | Dickey | ND | 00:30–? | 2miles | 30yd | Damages were estimated at $25,000 (1957 USD). Tornado researcher Thomas P. Grazulis did not list this tornado as an F2 or stronger.[3] [4] | ||
| bgcolor=# | F0 | SSE of Warren | Cass | ND | 00:30–? | 0.1miles | 10yd | Brief tornado occurred southwest of Fargo, North Dakota with little to no damage.[5] | ||
| bgcolor=# | F5 | Wheatland, ND to Fargo, ND to S of Winnipeg Junction, MN | Cass (ND), Clay (MN) | ND, MN | 00:40–04:10 | 52.4miles | 500yd | 10 deaths – See article on this tornado – Later analysis has determined that this was a family of at least five tornadoes. The death toll may be 12. 103 people were injured and damages were estimated at $25.250 million (1957 USD).[6] [7] [8] | ||
| bgcolor=# | F0 | Southern Fergus Falls | Otter Tail | MN | 01:30–? | 0.1miles | 10yd | The amount of damage is unknown.[9] | ||
| bgcolor=# | F2 | WNW of Ashton | Spink | SD | 04:00–? | 0.1miles | 10yd | 1 death – A mobile home, four barns, and a residence were destroyed or unroofed. Damages were estimated at $25,000 (1957 USD).[10] |
| F# | Location | County / Parish | State | Start | Time (UTC) | Path length | width | Summary | ||
|---|---|---|---|---|---|---|---|---|---|---|
| bgcolor=# | F1 | SSW of Holyoke | Yuma | CO | 08:15–? | 0.1miles | 10yd | Damages were estimated at $2,500 (1957 USD).[11] | ||
| bgcolor=# | F3 | Waco to Utica | York | NE | 00:15–? | 5.4miles | 10yd | An intense tornado moved eastward between the towns of Waco and Utica, destroying or damaging barns and outbuildings on 16 farms. Damages was estimated at $250,000 (1957 USD). Downbursts produced a 3miles swath of damage as well. Grazulis classified the tornado as an F2.[12] | ||
| bgcolor=# | F1 | Bellwood | Butler | NE | 00:30–? | 1miles | 100yd | Damages were estimated at $250 (1957 USD).[13] | ||
| bgcolor=# | F0 | Northern Valparaiso | Saunders | NE | 00:52–? | 0.1miles | 10yd | Damages were estimated at $30 (1957 USD).[14] | ||
| bgcolor=# | F0 | ESE of Norway | Republic | KS | 02:00–? | 0.1miles | 10yd | The amount of damage is unknown.[15] | ||
| bgcolor=# | F1 | Western Hutchinson | Reno | KS | 03:14–? | 0.1miles | 10yd | A trucking terminal was unroofed and a man may have been killed as a result. Widespread downbursts obscured the distinction between tornado and downburst damage and damage estimates are unknown as well. Grazulis classified the tornado as an F2.[16] | ||
| bgcolor=# | F0 | NNW of Benton to ESE of Hurley | Sedgwick | KS | 04:09–? | 2.3miles | 100yd | Tornado caused $2,500 (1957 USD) in damage to farmlands.[17] | ||
| bgcolor=# | F1 | E of De Soto to Zarah to S of Lake Quivera | Johnson | KS | 05:30–? | 9miles | 400yd | A destructive tornado moved directly through Zarah, west of Shawnee in the western suburbs of Kansas City. It injured two people and caused $250,000 (1957 USD) in damage.[18] |
| F# | Location | County / Parish | State | Start | Time (UTC) | Path length | width | Summary | ||
|---|---|---|---|---|---|---|---|---|---|---|
| bgcolor=# | F2 | Southern Kansas City to Birmingham to Liberty | Jackson | MO | 06:00–? | 19.8miles | 10yd | A strong tornado moved through the eastern side of Kansas City, causing $250 (1957 USD) in damage.[19] | ||
| bgcolor=# | F0 | Southern Albert Lea | Freeborn | MN | 16:00–? | 0.1miles | 10yd | A brief tornado caused little to no damage.[20] | ||
| bgcolor=# | F2 | Hudsonville | Ottawa | MI | 21:30–? | 0.1miles | 10yd | Major damage occurred in Downtown Hudsonville from this brief, but strong tornado. Businesses and homes were damaged or destroyed and trees were downed. Damage was estimated at $25,000 (1957 USD). This came just over one year after an F5 tornado caused major damage on the south side of town.[21] | ||
| bgcolor=# | F1 | Eau Claire to SW of Decatur | Ottawa, Cass | MI | 22:05–? | 10.7miles | 50yd | This tornado moved directly through Eau Claire, causing $25,000 (1957 USD) in damage.[22] | ||
| bgcolor=# | F0 | Dumont Lake | Allegan | MI | 22:10–? | 1miles | 10yd | Weak tornado passed near Dumont Lake, causing $30 (1957 USD) in damage.[23] | ||
| bgcolor=# | F2 | Southwestern Bay City | Bay | MI | 00:00–? | 0.1miles | 10yd | Brief, but strong tornado caused heavy destruction southwest of Bay City, totaling $25,000 (1957 USD) in damage.[24] | ||
| bgcolor=# | F1 | SSW of Campo | Baca | CO | 03:00–? | 0.1miles | 10yd | Brief tornado touchdown in the West Ute Canyon, causing $250 (1957 USD) in damage.[25] | ||
| bgcolor=# | F0 | N of Denver City to S of Plains | Yoakum | TX | 04:00–? | 0.1miles | 10yd | Little to no damage occurred.[26] | ||
| bgcolor=# | F1 | Finney | Hale | TX | 04:18–? | 0.5miles | 10yd | A tornado struck the town of Finney north of Plainview and Seth Ward, causing $2,500 (1957 USD) damage.[27] |
See main article: Fargo tornado.
| Wheatland—Fargo, North Dakota/Moorhead–Hawley, Minnesota | |
| Formed: | June 20, 1957 4:40 p.m. CDT |
| Duration: | 3 hours, 30 minutes |
| Dissipated: | June 20, 1957 8:10 p.m. CDT (UTC−06:00) |
| Basin: | atl |
| Winds: | 275 mph (442.57 km/h) |
| Fujita-Scale: | F5 |
| Enhanced: | no |
A violent F5 tornado family tore directly through Downtown Fargo, killing 10 and injuring 103. The supercell produced the first tornado at 5:40 pm CDT near Wheatland, North Dakota. The weak F0 tornado moved east-northeast, tossing haybales and damaging crops. After 11miles, the tornado lifted and another tornado touched down just to its south. It struck the town of Casselton at F2 intensity, causing major damage. After traveling 5miles the tornado lifted and supercell continued to the east for about 10miles without producing a tornado, although a consistent wall cloud was present.[2]
As it neared Fargo, the cell dropped another tornado over West Fargo. As it traveled east, it began to rapidly intensify, grew to 500yd, and became violent as it struck Fargo. Numerous homes, businesses, and vehicles were damaged and destroyed. One neighborhood had multiple homes that were completely swept away and all 10 fatalities occurred here. Damage at this location was rated F5. The tornado then weakened, but remained strong as it crossed the Red River into Moorhead, Minnesota, damaging more buildings and homes. The tornado then turned sharply north and dissipated after being on the ground for 9miles and injuring 103. After continuing another 5miles, the supercell dropped a fourth tornado, which quickly became a violent F4 storm as it moved eastward through Glyndon. It then turned northeastward, and produced significant tree damage along the Buffalo River before completely destroying a family farm. Significant damage was observed on a second farm before the tornado abruptly turned north and dissipated after traveling 10miles. The cell traveled about 5miles, before dropping one final F3 tornado in Dale. It traveled for 7miles, destroying a family farm as it occluded northward. A clock inside the residence stopped at 9:05 pm CDT, when the tornado struck. The tornado dissipated five minutes later at 9:10 pm CDT.[2] [29]
The family of tornadoes traveled a total 52.4miles, was 500yd wide at its peak, and was rated F5 when the Fujita scale came into effect in 1973. Although numerous studies indicate that this was a tornado family, it is officially listed as one continuous tornado. A total of 10 people were killed (some sources list the death toll as 12) and 103 others were injured with all the casualties occurring in Fargo, making it the deadliest tornado ever recorded in North Dakota. Damage was estimated $25.25 million (1957 USD).[7] [8]
Along with tornadoes, numerous reports of strong winds and large hail occurred during the period. June 20 saw baseball-sized hail south of Valley City in Barnes County, North Dakota.[30] Later, a 94mph wind gust was recorded just southeast of Ruskin Park, South Dakota.[31] The next day, a 100mph wind gust was recorded just northwest of Castleton, Kansas.[32] Just after midnight on June 22 in the Kansas City metropolitan area, an 92mph was recorded in Parkville, Missouri.[33] The strongest winds from the event were in Downtown Kansas City, where wind gusts reached as high as 115mph.[34] The next day, a massive 4.5inches hailstone was documented northeast of Fort Stockton, Texas, the largest from the event.[35]