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Severe Thunderstorms Possible in the South Central U.S.; Wildfire Smoke Impacts in the North Central U.S.; Severe Space Weather

Scattered severe thunderstorms may bring large hail and isolated damaging winds this weekend over parts of the south central U.S. Smoke from Canadian wildfires will bring air quality issues to parts of the north central U.S. this weekend. Moderate to Severe geomagnetic storm conditions will remain possible into early Monday following a strong coronal mass ejection from the sun. Read More >

Event Overview

Cold core low moved over the area, dragging along a weak and slow moving surface low pressure. While weak, sufficient low level and upper forcing aided in developing strong to severe storms. While instability was more than sufficient, the shear was lacking, but was enough to help develop a few supercell thunderstorms. Due to the weak forcing overall and the slow moving nature of the storms, some storms anchored over locations for an extended period of time, resulting in Flash Flooding. Some repeated storms over the same area also led to similar results. Severe weather reports were mostly in the form of hail, as these storms produced hail very efficiently. Some hail reaching 1.5", with some isolated reports of damaging winds. 

 

This event not only impacted the area on 8/19, but due to little movement of the system as a whole, repeated events were seen the following day, on 8/20. Storm action generally hovered over counties along and east of the Mississippi River on the second day. 8/20 was filled with many mini supercells, where many led to funnel clouds. Along with the funnel clouds, some reports of brief tornadoes were received. 

 

 

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Surface Map on August 20th
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