Multiple swarms of tornadoes terrorized the Plains on Thursday, bringing damage to the Interstate 35 corridor in Oklahoma — part of a classic springtime outbreak of severe weather. The same parent storm system could bring more tornadoes on Friday.
The well-anticipated weather, which drew a level 3 out of 5 “enhanced” risk of severe weather from the Storm Prediction Center, stemmed from a violent clash of air masses characteristic of the spring months.
The same parent storm system could bring more tornadoes on Friday. Another level 3 out of 5 enhanced risk of severe weather has been drawn for portions of the mid-Missouri Valley and encompasses Omaha Sioux City, Iowa, and regions along Interstate 29.Fomenting Thursday’s menagerie of meteorological malfeasance was a strong low pressure system ejecting out of the Colorado Rockies. The low was “stacked,” meaning a pocket of high-altitude frigid air, low pressure and spin hung over the surface low.
The northern zone, which stretched along Interstate 70 in eastern Colorado and western Kansas, was a “cold core” setup near the center of low pressure. Warmth and moisture struggled to snake that far north, but what little thunderstorm fuel present was met with extreme shear — or changing winds with height. That meant that any of the low-topped thunderstorms that formed rapidly rotated, producing a slew of tornadoes.
In Oklahoma, there was far more instability, i.e. thunderstorm fuel, but less shear . Meteorologists were unsure how the storms would evolve, but they knew that if limiting factors were overcome, the storms could become especially dangerous. That wound up exactly the case.Fourteen reported tornadoes accompanied the cold core setup. Meteorologists chased several along Highway 40 between Weskan, Kan., and Arapahoe, Colo.
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