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Archive:Tornado outbreak of August 9, 1993

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The tornado outbreak of August 9, 1993 was a small tornado outbreak that occurred over the Upper Midwest of the United States from the pre-dawn hours until dusk on August 9th. An F0 tornado near Littlefork, Minnesota lifted and moved a mobile home, killing its two occupants. It is Minnesota's most recent single tornado to cause multiple deaths. Other minor tornadoes occurred in Minnesota, Iowa and Wisconsin, causing limited damage.

Meteorological synopsis

At about 6:00 PM CST (23:00 UTC) a sea-level cyclone and occluded front were located over North Dakota.[1] Observations from International Falls showed the tropopause was at 39,800 feet (Expression error: Unrecognized punctuation character ",". m), while observations from Bismarck recorded it at 39,000 feet (Expression error: Unrecognized punctuation character ",". m).[1] Lifted Indices (LI) at the time CDT were also low, and thunderstorms were starting to develop in the Eastern Dakotas.[1] In response to the storms, the National Severe Storms Forecast Center (NSSFC) issued a tornado watch for the eastern Dakotas.[1] At 11:55 PM CST (0440 UTC) the outbreak's first confirmed tornado was reported near Gully, Minnesota. As a result of the tornado a Tornado Warning was issued for Clearwater County; the storm's next location.[1][2] Ten minutes later at 12:05 PM CST (0450 UTC) another tornado, rated an F0, was reported near Roseau, Minnesota.[1][3] After the two August 8th tornadoes, most local warnings were allowed to expire, as local radar did not determine any of the storms to be severe.[1] During the early morning hours of August 9 Duluth radar indicated multicellular convection near the Littlefork, Minnesota area that was associated with an outflow boundary from the earlier Dakota storms.[1] At 1:35 AM CST (0735 UTC) a deadly F0 tornado touched down unexpectedly near Littlefork, in association with the multicellular thunderstorm.[4] Unstable air from the day before persisted over much of the upper Midwest, and allowed storms to form over much of the area. On the night of August 9th the strongest tornado of the outbreak, an F2, occurred near New Hampton injuring 2 people.[5] Another cluster of thunderstorms occurred over Wisconsin, producing 3 relatively minor tornadoes.[6]

Confirmed tornadoes

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August 9 event

List of confirmed tornadoes – Monday, August 9, 1993Template:Efn
F# Location County / Parish State Start Coord. Time (UTC) Path length Max width
color|storm}}; border-bottom: 1px solid black"| F0 S of Gully Polk MN 47°44′N 95°38′W / 47.73°N 95.63°W / 47.73; -95.63 (Gully (Aug. 9, F0)) 05:40 {{rnd/cTemplate:Rnd/b|0.1|1|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
This brief tornado damaged several farm buildings and uprooted trees.[7]
color|storm}}; border-bottom: 1px solid black"| F0 N of Roseau Roseau MN 48°52′N 95°45′W / 48.87°N 95.75°W / 48.87; -95.75 (Roseau (Aug. 9, F0)) 05:50 {{rnd/cTemplate:Rnd/b|0.1|1|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
A warehouse was damaged.[8]
color|storm}}; border-bottom: 1px solid black"| F0 E of Littlefork Koochiching MN 48°24′N 93°28′W / 48.40°N 93.47°W / 48.40; -93.47 (Littlefork (Aug. 9, F0)) 07:35 {{rnd/cTemplate:Rnd/b|1.25|2|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
2 deaths – A mobile home was swept off its concrete slab and tossed a quarter of a mile. A farm home was also damaged.[9][10]
color|cat2}}; border-bottom: 1px solid black"| F2 N of Ionia to W of New Hampton Chickasaw IA 43°04′N 92°27′W / 43.07°N 92.45°W / 43.07; -92.45 (Ionia (Aug. 9, F2)) 22:40–22:52 {{rnd/cTemplate:Rnd/b|5|0|0}} mi ({{rnd/cTemplate:Rnd/b|8|(1−0)|1}} km) Template:Convert/yd
Multiple farm buildings were destroyed. Two people were injured when their car was slammed with debris.[11]Template:Sfn
color|storm}}; border-bottom: 1px solid black"| F0 SE of Fifield Price WI 45°49′N 90°19′W / 45.82°N 90.32°W / 45.82; -90.32 (Fifield (Aug. 9, F0)) 01:15 {{rnd/cTemplate:Rnd/b|0.3|1|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
A few trees were damaged.[12]
color|cat1}}; border-bottom: 1px solid black"| F1 NNE of Dover Price WI 45°41′N 90°11′W / 45.68°N 90.18°W / 45.68; -90.18 (Dover (Aug. 9, F0)) 02:00 {{rnd/cTemplate:Rnd/b|0.5|1|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
This tornado ripped the roof off of a barn and downed several trees.[13]
color|storm}}; border-bottom: 1px solid black"| F0 N of Tripoli Oneida WI 45°34′N 90°00′W / 45.57°N 90.00°W / 45.57; -90.00 (Tripoli (Aug. 9, F0)) 02:15 {{rnd/cTemplate:Rnd/b|0.3|1|1}} mi ({{rnd/cTemplate:Rnd/b|Expression error: Unexpected < operator.|(Expression error: Unexpected < operator.)|Expression error: Unexpected < operator.}} km) Template:Convert/yd
Minor damage occurred.[14]

See also

Notes

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References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Packingham, Dean. "The Littlefork Tornado: A Post-Event Analysis". National Weather Service Office Duluth. http://www.crh.noaa.gov/crh/?n=arp16-05. Retrieved on 7 March 2010. 
  2. ↑ "Event Record Details". National Climatic Data Center (NCDC). http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~210683. Retrieved on 4 March 2010. 
  3. ↑ "Event Record Details". National Climatic Data Center (NCDC). http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~210762. Retrieved on 4 March 2010. 
  4. ↑ "Event Record Details". National Climatic Data Center (NCDC). http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~210417. Retrieved on 4 March 2010. 
  5. ↑ "Event Record Details". National Climatic Data Center (NCDC). http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~200706. Retrieved on 4 March 2010. 
  6. ↑ "Event Record Details". National Climatic Data Center (NCDC). http://www4.ncdc.noaa.gov/cgi-win/wwcgi.dll?wwevent~ShowEvent~247480. Retrieved on 5 March 2010. 
  7. ↑ Template:Cite report
  8. ↑ Template:Cite report
  9. ↑ Template:Cite report
  10. ↑ Grazulis, Thomas P. (2023). Significant Tornadoes 1974–2022. St. Johnsbury, Vermont: The Tornado Project. p. 213. ISBN 978-1-879362-01-7. 
  11. ↑ Template:Cite report
  12. ↑ Template:Cite report
  13. ↑ Template:Cite report
  14. ↑ Template:Cite report

Template:1993 tornado outbreaks

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