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1966 Jackson, Mississippi tornado

F5 Tornado in Jackson, MS

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Through Tornado, Mississippi and Atmosphere

The tornado is commonly known as the Candlestick Park tornado after the name of a recently opened shopping center that was leveled by the storm.

Meteorological synopsis

On Thursday, March 3, the atmosphere over Mississippi was ripe for a violent tornado. In the upper-levels of the troposphere, a fairly strong jet stream, with winds estimated at 140 to 150 miles per hour (230 to 240 km/h), oriented itself northeastward over the state, providing strong diffluence. A large mid-level trough, centered near Sioux Falls, South Dakota, was the overall system that produced the tornado. It featured low millibar heights roughly four times below the standard mean. Additionally, an unusually strong mid-level jet stream with 105 mph (169 km/h) winds provided additional energy to the storm system. The final factor in the development of the Candlestick Park storm was a subtle wind shift near the surface. At the higher levels, winds flowed from the southwest to the northeast in relation to the jet stream; however, closer to the surface, the inflow from the low pressure system over South Dakota resulted in a south to north flow, allowing for rotation within storms.

In the hours prior to the tornado forming, convective available potential energy (CAPE) values of over 1,500 J/kg were present, indicating moderate instability. However, dry air at higher levels created a capping inversion, limiting the number of thunderstorms that could develop. Later on, a warm front moved past Jackson, Mississippi, allowing more moist air into the region and increasing lapse rates. While this cap served to prevent a widespread tornado outbreak, it did allow for the formation of a few discrete strong storms. With this, a supercell thunderstorm developed over Louisiana and produced at least three tornadoes, including the large F5 tornado that moved through Mississippi and Alabama.

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