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Tornado outbreak of August 9, 1993

Extreme weather event in US Upper Midwest

Extreme weather event in US Upper Midwest

FieldValue
nameTornado outbreak of August 9, 1993
dateAugust 9, 1993

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. Observations from International Falls showed the tropopause was at 39,800 ft, while observations from Bismarck recorded it at 39,000 ft. Lifted Indices (LI) at the time CDT were also low, and thunderstorms were starting to develop in the Eastern Dakotas. In response to the storms, the National Severe Storms Forecast Center (NSSFC) issued a tornado watch for the eastern Dakotas. 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. Ten minutes later at 12:05 PM CST (0450 UTC) another tornado, rated an F0, was reported near Roseau, Minnesota. 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. 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. At 1:35 AM CST (0735 UTC) a deadly F0 tornado touched down unexpectedly near Littlefork, in association with the multicellular thunderstorm. 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. Another cluster of thunderstorms occurred over Wisconsin, producing 3 relatively minor tornadoes.

Confirmed tornadoes

August 9 event

F#LocationCounty / ParishStateStart Coord.Time (UTC)Path lengthMax widthcolorstorm}}; border-bottom: 1px solid black"F0colorstorm}}; border-bottom: 1px solid black"F0colorstorm}}; border-bottom: 1px solid black"F0colorcat2}}; border-bottom: 1px solid black"F2colorstorm}}; border-bottom: 1px solid black"F0colorcat1}}; border-bottom: 1px solid black"F1colorstorm}}; border-bottom: 1px solid black"F0
S of GullyPolkMN05:400.1 mi10 yd
This brief tornado damaged several farm buildings and uprooted trees.
N of RoseauRoseauMN05:500.1 mi10 yd
A warehouse was damaged.
E of LittleforkKoochichingMN07:351.25 mi200 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.
N of Ionia to W of New HamptonChickasawIA22:40–22:525 mi55 yd
Multiple farm buildings were destroyed. Two people were injured when their car was slammed with debris.
SE of FifieldPriceWI01:150.3 mi50 yd
A few trees were damaged.
NNE of DoverPriceWI02:000.5 mi75 yd
This tornado ripped the roof off of a barn and downed several trees.
N of TripoliOneidaWI02:150.3 mi50 yd
Minor damage occurred.

Notes

References

References

  1. Packingham, Dean. "The Littlefork Tornado: A Post-Event Analysis". National Weather Service Office Duluth.
  2. (October 2016). "Event Record Details". National Climatic Data Center (NCDC).
  3. (October 2016). "Event Record Details". National Climatic Data Center (NCDC).
  4. (October 2016). "Event Record Details". National Climatic Data Center (NCDC).
  5. (October 2016). "Event Record Details". National Climatic Data Center (NCDC).
  6. "Event Record Details". National Climatic Data Center (NCDC).
  7. National Weather Service in Grand Forks, North Dakota. (1993). "Minnesota Event Report: F0 Tornado". National Centers for Environmental Information.
  8. National Weather Service in Grand Forks, North Dakota. (1993). "Minnesota Event Report: F0 Tornado". National Centers for Environmental Information.
  9. National Weather Service in Duluth, Minnesota. (1993). "Minnesota Event Report: F0 Tornado". National Centers for Environmental Information.
  10. (2023). "Significant Tornadoes 1974–2022". The Tornado Project.
  11. National Weather Service in La Crosse, Wisconsin. (1993). "Iowa Event Report: F2 Tornado". National Centers for Environmental Information.
  12. National Weather Service in Duluth, Minnesota. (1993). "Wisconsin Event Report: F0 Tornado". National Centers for Environmental Information.
  13. National Weather Service in Duluth, Minnesota. (1993). "Wisconsin Event Report: F1 Tornado". National Centers for Environmental Information.
  14. National Weather Service in Green Bay, Wisconsin. (1993). "Wisconsin Event Report: F0 Tornado". National Centers for Environmental Information.
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