Meteorological Analysis
The system formed on a cold front that tracked across the Midwest and stretched from the northern Great Lakes to 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 seven were confirmed across the entire region over a 24-hour period) but four significant tornadoes formed from two simultaneous supercells in southern Indiana and western Kentucky — one of them was the deadly Evansville tornado.
Read more about this topic: Evansville Tornado Of November 2005
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