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June 1990 Lower Ohio Valley tornado outbreak
The June 1990 Lower Ohio Valley tornado outbreak was a tornado outbreak that occurred in southern Illinois, central and southern Indiana, southwestern Ohio, and northern Kentucky on June 2–3, 1990. By the end of the outbreak, 66 tornadoes had struck the Ohio River Valley, including seven of F4 intensity. 37 tornadoes occurred in Indiana, a record for a single day that eclipsed the previous record of 21 set during the Super Outbreak on April 3, 1974.
==Meteorological synopsis==
On June 2, an unseasonably intense surface low over eastern North Dakota brought with it a cold front across the Mississippi Valley. Ahead of the front, a highly unstable air mass combined with a strong jet stream that increased the synoptic-scale lifting favoring supercell development. Meanwhile, backed southerly low-level winds brought moist dew points well into the region.〔 The National Severe Storms Forecast Center in Norman, Oklahoma, 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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