Tornado outbreak of August 6, 1969
Template:Short description Template:Use mdy dates Template:Infobox weather event Template:Infobox weather event/Tornado outbreak Template:Infobox weather event/Effects Template:Infobox weather event/Footer On August 6, 1969, a destructive tornado outbreak affected portions of the Upper Midwest—principally north-central Minnesota. The severe weather event generated 14 confirmed tornadoes, killed 15 people, and caused 109 injuries. To date, the outbreak remains the deadliest on record in the North Woods region of Minnesota. It is also known as the 1969 Minnesota tornado outbreak and the 1969 North Woods tornado outbreak. The most destructive tornado of the outbreak was a Script error: No such module "convert". violent F4 that leveled miles of timberland and farmland across portions of Crow Wing, Cass, and Aitkin counties in Minnesota, killing at least 12 people and injuring 70 others.[1][2]Template:Efn
Background
Very warm, humid, summertime air had pushed into central and southern Minnesota on August 6, 1969. Minneapolis recorded a high temperature of Script error: No such module "convert". with dew points near Script error: No such module "convert".. Meanwhile, strong upper-level winds over northern Minnesota and an approaching cold front from the west added the needed ingredient for the strong storms.[1] Two distinct thunderstorms formed approximately Script error: No such module "convert". apart and tracked east-northeastward across Minnesota at Script error: No such module "convert"..Template:Sfn These parallel storms generated 14 tornadoes, killing 15 people and injuring 109.
The first tornado of the day, rated F0, touched down at 1:15 p.m. CDT (12:15 p.m. CST; 18:15 UTC) in Beltrami County.[1][3] The main tornado event started about three hours later in Cass County when an F3 tornado touched down southwest of Backus, injuring four people.[4] The most damaging tornado of the outbreak touched down at 4:48 p.m. CDT (3:48 p.m. CST; 21:48 UTC) in Crow Wing County. It achieved F4 strength, traveling Script error: No such module "convert". through Crow Wing, Cass and Aitkin counties. The area around Outing was especially hard hit by this tornado, where 11 deaths and 40 injuries occurred on the shores of Roosevelt Lake.[1]
Several more strong tornadoes touched down over the next two hours, killing one person near Jacobson and two people near Two Harbors.[1] Damage and casualties were limited, however, because most of the twisters, however large in size, struck rural areas.Template:Sfn
Confirmed tornadoes
| FU | F0 | F1 | F2 | F3 | F4 | F5 | Total |
|---|---|---|---|---|---|---|---|
| 1 | 2 | 0 | 8 | 2 | 1 | 0 | 14 |
{{efn|Prior to 1990, there is a likely undercount of tornadoes, particularly E/F0–1, with reports of weaker tornadoes becoming more common as population increased. A sharp increase in the annual average E/F0–1 count by approximately 200 tornadoes was noted upon the implementation of NEXRAD Doppler weather radar in 1990–1991.Template:SfnTemplate:Efn 1974 marked the first year where significant tornado (E/F2+) counts became homogenous with contemporary values, attributed to the consistent implementation of Fujita scale assessments.Template:SfnTemplate:Efn Numerous discrepancies on the details of tornadoes in this outbreak exist between sources. The total count of tornadoes and ratings differs from various agencies accordingly. The list below documents information from the most contemporary official sources alongside assessments from tornado historian Thomas P. Grazulis.
| Color / symbol | Description |
|---|---|
| † | Data from Grazulis 1990/1993/2001b |
| ¶ | Data from a local National Weather Service office |
| ※ | Data from the 1969 Storm Data publication |
| ‡ | Data from the NCEI database |
| ♯ | Maximum width of tornado |
| ± | Tornado was rated below F2 intensity by Grazulis but a specific rating is unavailable. |
| F# | Location | County / Parish | State | Start Coord.Template:Efn | Time (UTC)Template:Efn | Path length | WidthTemplate:Efn | Damage |
|---|---|---|---|---|---|---|---|---|
| F0 | Lake Bemidji | Beltrami | Minnesota | Script error: No such module "Coordinates". | 18:15–? | Script error: No such module "convert".‡ | Script error: No such module "convert".‡ | Template:Unk |
| A short-lived waterspout was sighted.[5][3]Template:Sfn | ||||||||
| F3 | NE of Nimrod to ENE of Backus | Cass | Minnesota | Script error: No such module "Coordinates". | 21:20–21:40※ | Script error: No such module "convert".※ | Script error: No such module "convert".† | Template:Nts※ |
| This intense tornado, which lifted at the southeastern corner of Big Portage Lake, significantly damaged or destroyed 13 farms to the southeast of Backus. Additionally, it destroyed 11 homes to the east of Backus. One trailer was destroyed as well. Four people were seriously injured and hospitalized.Template:Sfn[4]Template:Sfn | ||||||||
| F4 | NNW of Swanburg to S of Hill City※ | Crow Wing, Cass, Aitkin | Minnesota | Script error: No such module "Coordinates". | 21:48–22:28※ | Script error: No such module "convert".※ | ~Script error: No such module "convert".♯¶ | Template:Nts※ |
| 12+ deaths – This large, violent tornado attained a width of almost Script error: No such module "convert". while passing a short distance north of Outing. Of the dozen deaths 11 took place around Lake Roosevelt, and 40 children in the vicinity were injured while vacationing. Along its path, the tornado hurled cars and downed thousands of trees, many of which were debarked. The tornado also destroyed scores of cabins and leveled farmsteads. In all, 70 people were injured. The death toll may have exceeded 12.Template:SfnTemplate:Sfn[6][7][8]Template:Sfn | ||||||||
| F2† | NNE of Chisholm to S of Idington | St. Louis | Minnesota | Script error: No such module "Coordinates". | 22:25–22:38※ | Script error: No such module "convert".※ | >Script error: No such module "convert".♯※ | Template:Nts※ |
| This tornado, which ended just north of Big Sandy Lake, reportedly exceeded Script error: No such module "convert". in width. It destroyed numerous trees, homes, and cabins. Nine people were injured.Template:SfnTemplate:Sfn[9]Template:Sfn | ||||||||
| F2† | WNW of Jacobson※ | Aitkin | Minnesota | Script error: No such module "Coordinates". | 22:50–23:03※ | Script error: No such module "convert".※ | Template:Unk | Template:Nts |
| 1 death – This tornado, which formed from the same storm as the Outing F4, destroyed a cabin, seven agricultural outbuildings, and a pair of farmhouses. The number of injuries was unknown at the time, but was later listed as three in official records. The NCEI incorrectly list the path as extending from southeast of Hill City to east-southeast of Ball Bluff.Template:Sfn[10]Template:Sfn | ||||||||
| F2± | WNW to NNE of Wahlsten (1st tornado)※ | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:00–? | Script error: No such module "convert".※ | Script error: No such module "convert". | Template:Nts※ |
| This tornado and the following two events occurred in close proximity and succession. Further information is lacking.Template:Sfn[11]Template:Sfn | ||||||||
| F2± | WNW to NNE of Wahlsten (2nd tornado)※ | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:00–? | Script error: No such module "convert".※ | Script error: No such module "convert". | Template:Nts※ |
| Details are unavailable.Template:Sfn[12]Template:Sfn | ||||||||
| F2† | SW of Tower to SSW of Eagles Nest† | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:00–? | Script error: No such module "convert".※ | Script error: No such module "convert".† | Template:Nts※ |
| This strong tornado, which ended near Eagles Nest Lake No. 3, damaged or destroyed several homes and barns, while felling hundreds of trees.Template:Sfn[13]Template:Sfn | ||||||||
| F3¶ | NW of Floodwood to NW of Baden※ | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:00–23:29※ | Script error: No such module "convert".※ | Script error: No such module "convert".♯※ | Template:Nts※ |
| According to the National Weather Service (NWS), damage from this tornado was nearly as intense as that of the Outing F4, spawned by the same thunderstorm. This tornado was up to Script error: No such module "convert". wide near Floodwood. It killed 39 head of cattle, felled hundreds of trees, and destroyed several cabins and barns. 20 people were injured. The path ended north-northeast of Prosit.Template:Sfn[1][14]Template:Sfn | ||||||||
| F2† | SW of Eagles Nest to SSE of McComber | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:15–? | Script error: No such module "convert".※ | Script error: No such module "convert".† | Template:Nts※ |
| This tornado destroyed trees and cottages in its path.Template:Sfn[15]Template:Sfn | ||||||||
| FU※ | Bear Island Lake | St. Louis | Minnesota | Template:Unk | 23:30–? | Script error: No such module "convert". | Script error: No such module "convert". | Template:Nts |
| This tornado is not officially listed, but was recorded in the publication Storm Data.Template:Sfn[16]Template:Sfn | ||||||||
| F2± | SSW of Burntside to S of Ely※ | St. Louis | Minnesota | Script error: No such module "Coordinates". | 23:35–? | Script error: No such module "convert".※ | Script error: No such module "convert".‡ | Template:Nts※ |
| This event may have consisted of twin tornadoes that merged. Further information is unavailable. A jet-like din was noted for a few minutes.Template:Sfn[17]Template:Sfn | ||||||||
| F2† | N of Island Lake to NE of Two Harbors† | St. Louis, Lake | Minnesota | Script error: No such module "Coordinates". | 23:50–00:15※ | Script error: No such module "convert".※ | Script error: No such module "convert".† | Template:Nts※ |
| 2 deaths – On the eastern shoreline of Boulder Lake, a cabin was wrecked, resulting in the deaths. Hundreds of trees were splintered and three people were injured. The tornado exhibited a skipping path, with intermittent damage.Template:Sfn[18]Template:Sfn | ||||||||
| F0 | NW of Monroe※ | Platte | Nebraska | Script error: No such module "Coordinates". | 01:40–? | Template:Unk | Template:Unk | Template:Unk |
| A brief touchdown occurred over uninhabited countryside.[5][19]Template:Sfn | ||||||||
See also
Notes
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References
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Sources
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