June 1990 Lower Ohio Valley Tornado Outbreak - Event

Event

The National Severe Storms Forecast Center put out a high risk for severe weather over much of Illinois, Indiana, Ohio, and northern Kentucky. A notable feature of this outbreak is that there was a sector of weak tornadoes north of Terre Haute, Indiana while a sector of strong and violent tornadoes developed south of the city. This could perhaps be attributed to the storms in central Indiana having weaker helicity—a measurement of storm rotation—resulting in many of the storms farther to the north being left-moving supercells. These types of supercells are generally weaker than their right-moving counterparts.

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