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2005 Evansville tornado

Deadly F3 tornado in Evansville, Indiana

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This tornado occurred in a small outbreak of nine tornadoes that span from November 5 to November 6, taking place across the Mississippi Valley and the Midwest.

Meteorological synopsis

The system formed on a warm front that tracked across the Midwest and stretched from the northern Great Lakes into Tennessee. The front was enhanced by a strong jet stream and warm, humid air ahead of it, allowing thunderstorms to develop. A severe thunderstorm watch was issued for the region just west of Evansville as the main threat appeared to be straight-line winds. The system had formed into a squall line but at about 1:30 am CST (0730 UTC), the squall line broke up in the Ohio Valley area, as the low-level jet intensified, allowing embedded tornadoes to form rapidly out of newly formed supercells. They were fairly isolated (only nine were confirmed across the entire region over 24 hours) but three significant tornadoes formed from two simultaneous supercells in southern Indiana and western Kentucky — one of them was the F3 tornado. Dew points were in the upper 50°s along with CAPE reaching up to 1,000 J/kg. The threat for damaging winds was expected to lessen throughout the night due to stabilization in the atmosphere. By the time the squall line reached southern Indiana and portions of Kentucky, the chance of an isolated tornado threat was noted by the Storm Prediction Center. SRH in the 0-1 kilometer (0-0.6 mile) portion of the atmosphere had reached 340 m2/s2.

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