November 17, 2013 tornado outbreak
Storms associated with the outbreak over the Midwest United States on November 17
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| Type | Tornado outbreak |
|---|---|
| Duration | November 17, 2013 |
| Tornadoes confirmed | 73 confirmed, 136 reported |
| Max rating1 | EF4 tornado |
| Duration of tornado outbreak2 | 10 hours, 48 minutes |
| Highest winds |
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| Largest hail | 4.00 in (10.2 cm) in diameter in Bloomington, IL |
| Damage | $1.6 billion |
| Casualties | 8 fatalities (+3 non-tornadic); 190+ injuries (+2 indirect) |
| Areas affected | Midwest United States |
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1Most severe tornado damage; see Enhanced Fujita scale 2Time from first tornado to last tornado |
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1Most severe tornado damage; see Enhanced Fujita scale
The tornado outbreak of November 17, 2013, was the deadliest and costliest in the U.S. state of Illinois to occur in the month of November and fourth largest for the state overall. Associated with a strong trough in the upper levels of the atmosphere, the event resulted in 73 tornadoes tracking across regions of the Midwest United States and Ohio River Valley, impacting seven states. Severe weather during the tornado outbreak caused over 100 injuries and eleven fatalities, of which eight were tornado related. Two tornadoes—both in Illinois and rated EF4 on the Enhanced Fujita Scale—were the strongest documented during the outbreak and combined for five deaths. In addition to tornadoes, the system associated with the outbreak produced sizeable hail peaking at 4.00 in (10.2 cm) in diameter in Bloomington, Illinois, as well as damaging winds estimated as strong as 100 mph (160 km/h) in three locations.
The development and progression of a severe weather event on November 17 had been well anticipated, and appeared in Storm Prediction Center products as early as November 12. The first storms associated with the event formed during the afternoon and evening hours of November 16 over the Great Plains, producing primarily hail and strong winds. However, tornadic activity was limited to November 17, as individual supercell thunderstorms tracked across the Midwest United States, at times producing long-tracked tornadoes. The first tornadoes formed over Illinois, while the final tornadoes developed over Tennessee. Towards the end of November 17, these individual systems had merged into an extensive squall line that tracked eastward across the Mid-Atlantic states, producing damaging wind before exiting into the Atlantic Ocean early on November 18.
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Wikipedia