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词条 1969 Minnesota tornado outbreak
释义

  1. Meteorological synopsis

  2. Outbreak description

  3. Confirmed tornadoes

  4. See also

  5. References

  6. External links

{{Use mdy dates|date=February 2012}}{{Infobox storm
| name = 1969 Minnesota tornado outbreak
| image = LakeRoosevelt_Tornado_Damage_1969_August_cabins.jpg
| alt =
| caption = Damage to cabins near the current Lake Roosevelt Resort just north of Outing, Minnesota, from the F4 tornado. Damage in the photo is not indicative of maximum intensity.
| type = Tornado outbreak
| active = August 6, 1969
| lowest pressure =
| lowest temperature =
| tornadoes = 13
| fujitascale = F4
| tornado duration = 7 1/2 hours
| highest winds =
| hail =
| gusts =
| maximum snow =
| power outages =
| casualties = 15 deaths, 109 injuries
| damages = $88.4 million (2006 USD)
| affected = Minnesota, Nebraska
| current advisories =
| enhanced =
| notes =
}}

The 1969 Minnesota tornado outbreak was a tornado outbreak that affected portions of north central Minnesota on August 6, 1969. There were 13 confirmed tornadoes from the outbreak, 15 people were killed and 109 were injured.

Meteorological synopsis

Very warm, humid, summertime air had pushed into central on southern Minnesota on August 6, 1969. Minneapolis saw a high temperature of {{convert|93|F|C|0}} with dew points near {{convert|70|F|C|0}}.[1] Meanwhile, strong upper-level winds over northern Minnesota and an approaching cold front from the west added the needed ingredient for the strong storms.[2]

Outbreak description

Thirteen tornadoes touched down that day, killing 15 people and injuring 109. The first tornado of the day, rated F0, touched down at 12:15 pm CDT in Beltrami County.[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]

Outbreak death toll
StateTotalCountyCounty
total
Minnesota15Aitkin1
Cass12
St. Louis2
Totals15
All deaths were tornado-related
The most damaging tornado of the outbreak touched down at 3:48 pm in Crow Wing County. It achieved F4 strength, traveling {{convert|38|mi|km|0}} 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.[5]

Several more strong tornadoes touched down over the next two hours, killing one person near Jacobson and two people near Two Harbors.[5] Damage and casualties were limited however because most of the twisters struck rural areas.

Confirmed tornadoes

Table of confirmed tornadoes – after surveys by local weather service offices[6]

{{Tornado Chart | Total=13 | F0=2 | F1=0 | F2=3 | F3=7 | F4=1 | F5=0}}
F#LocationCountyTime (UTC)Path lengthDamage
Minnesota
storm}} | F0BemidjiBeltrami18150.1 miles
(0.16 km)		No Damage Reported.
cat3}} | F3Backus areaCass212017.3 miles
(27.7 km)		$2.5 Million in damages, 4 injuries. 5 miles NE of Nimrod to 4 mi ENE of Backus. 11 homes were destroyed, and 13 farms were destroyed or heavily damaged. One trailer was destroyed as well.[7]
cat4}} | F4Outing areaCrow Wing, Cass, Aitkin214832.3 miles
(51.7 km)		12+ deaths occurred with 70 injuries, $7.5 Million in damages. Large F4 wedge tornado hit the town of Outing at 1702 hrs CDT resulting in heavy damage. Thousands of trees, many cabins, and farms were leveled by the tornado.[7]
cat3}} | F3NE of ChisholmSt. Louis222510 miles
(16 km)		$2.5 million in damage. Homes, cabins, and utilities were destroyed. Many trees were downed and nine people were injured.[7]
cat3}} | F3S of JacobsonAitkin225012.5 miles
(20 km)		1 death 3 injured, $250k in damage. Two farm homes, seven outbuildings, and a cabin were destroyed.[7]
cat2}} | F2S of Tower (1st tornado)St. Louis23002 miles
(3.2 km)		Homes and barns were damaged and destroyed. Hundreds of trees were downed as well. Caused $25k in damage.[7]
cat2}} | F2S of Tower (2nd tornado)St. Louis23001 mile
(1.6 km)		Cottages were destroyed and trees were downed. Caused $25k in damage.[7]
cat3}} | F3E of TowerSt. Louis23007.2 miles
(11.5 km)		Caused $250k in damage.
cat3}} | F3Floodwood areaSt. Louis230018.4 miles
(29.4 km)		$2.5 million in damage. Barns and cabins were destroyed and homes were badly damaged. Hundreds of trees were downed as well. 20 people were injured and 39 head of livestock were killed.[7]
cat3}} | F3E of SoudanSt. Louis23153.8 miles
(6.1 km)		$250k in damage
cat2}} | F2S of ElySt. Louis23351.9 miles
(3 km)		$25k in damage
cat3}} | F3N of Duluth to Two HarborsSt. Louis, Lake235017.2 miles
(27.5 km)		2 deaths – $250k in damage in St. Louis County. $2.5 k in damage in Lake County. A cabin was destroyed, resulting in two fatalities. Hundreds of trees were snapped and three people were injured.[7]
Nebraska
storm}} | F0NE of Monroe Platte01400.1 miles
(0.16 km)
Source: Tornado History Project – August 6, 1969 Storm Data

See also

  • Climate of Minnesota
  • List of North American tornadoes and tornado outbreaks
  • Tornadoes of 1969

References

1. ^{{cite web | title = Daily Weather Records for the Twin Cities: 1960's | publisher = NOAA | url = http://climate.umn.edu/doc/twin_cities/msp1960's.htm | accessdate =December 26, 2006 }}
2. ^{{cite web | title = Daily Weather Maps | publisher = U.S. Weather Bureau | date = August 10, 1969 | url = http://docs.lib.noaa.gov/rescue/dwm/1969 | format = DJVU | accessdate =December 26, 2006 }}
3. ^{{cite web | title = Event Record Details – Beltrami County F2 | publisher = National Climatic Data Center | date = August 6, 1969 | url = http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~73922 | accessdate =March 2, 2008}}
4. ^{{cite web | title = Event Record Details – Cass County F3 | publisher = National Climatic Data Center | date = August 6, 1969 | url = http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~73924 | accessdate =March 2, 2008}}
5. ^1 {{cite web | title = Memorable Northland Storms | publisher = National Oceanic and Atmospheric Administration | date = September 14, 2005 | url = http://www.crh.noaa.gov/dlh/?n=memorablewinterstorms | accessdate =December 26, 2006 }}
6. ^{{cite web | title = Storm Events | publisher = National Climatic Data Center | url = http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~Storms | accessdate = December 26, 2006 | archive-url = https://web.archive.org/web/20110505093502/http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwEvent~Storms | archive-date = May 5, 2011 | dead-url = yes | df = mdy-all }}
7. ^1 2 3 4 5 6 7 {{cite book | last = Grazulis | first = Thomas P | title = Significant Tornadoes 1680-1991 | publisher = The Tornado Project of Environmental Films | location = St. Johnsbury, Vermont | isbn = 1-879362-03-1 |date= July 1993}}

External links

  • [https://web.archive.org/web/20070811154836/http://climate.umn.edu/doc/historical/tornadic.htm Minnesota Tornado History and Statistics]
  • Gendisasters.com
{{DEFAULTSORT:1969-08-06 Minnesota tornado outbreak}}

6 : F4 tornadoes by date|F4 tornadoes by location|Tornadoes of 1969|Tornadoes in Minnesota|1969 in Minnesota|August 1969 events
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