1991 Alexandria, Indiana tornado

the 1991 Alexandria, Indiana tornado, also known as the Great Storm of Halloween 1991 or the Halloween Cyclone of 1991, was a devastating, deadly and high-end F3 tornado that struck the town of Alexandria, Indiana during the early evening hours of October 31, 1991. The tornado was the second deadliest of the year, and was often considered a national tragedy. It was one of many strong tornadoes that touched down during the historic Tornado outbreak of October 30-31, 1991.

Meteorological setup
On the morning of October 31, 1991, a unusually warm and humid atmosphere existed across the Midwestern United States, warranting the NSSFC to highlight a slight risk of severe thunderstorms for that afternoon, concerning a straight-line wind and very isolated tornado threat. The previous day had seen 28 tornadoes touch down across portions of the Great Plains, including a F4 over rural Kansas. CAPE values topped out at 6,000 J/kg that morning across the region, however it was expected that a warm mid level troposphere would limit the severe thunderstorm development to very isolated clusters.

However, this setup fell apart early that afternoon, with a significant blast of cool air into the mid level troposphere allowed significantly more instability to develop, warranting the NSSFC to upgrade the risk level to a high risk, one of the few ever issued in October. Despite this, many towns in Indiana didn't cancel Halloween festivities, one such town was Alexandria. The initial supercells early that afternoon exhibited more straight-line wind producing tendencies, rather than tornado producing ones, and at 1740, the NSSFC issued a tornado watch for all of Indiana.

The first tornado of the day was a F2, that touched down near Albany, Indiana, at 1830, east of Alexandria. It was noted that storms would develop not in a really specific pattern, making it difficult to predict where the storms' worst impact would be. The supercell that would go on to produce the Alexandria F3 tornado first popped up as a rain shower over Indianapolis at 2056, and proceeded northeast, warranting a severe thunderstorm warning for Madison County at 2130, and a tornado warning at 2155.

Tornado history and path
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