EF1 tornado in Butler County, Missouri

An EF-2 tornado (max of EF-1 in Butler County) began in far southeast Oregon County, then tracked northeastward across the entirety of Ripley County before entering Butler County just north of US-160. The track continued into the western edge of Poplar Bluff with minor roof and shingle damage to homes. Hundreds of trees were uprooted and snapped along the tornado track. Several homes sustained gutter and shingle damage. Estimated peak winds with the Butler County portion of this tornado were 105 mph.

The second major severe weather outbreak for the month occurred on the 26th for the Quad State region. On the synoptic scale, a shortwave trough centered in the middle of the country with a 60 kt mid-level jet moved across northern Arkansas. A weak surface low was moving into SE Missouri during the morning with a secondary low located further northwest. A warm frontal boundary was draped across our area. A bowing line progressed east across SE Missouri into W Kentucky and far S Illinois between 0500-1000CST, followed by a mostly sub-severe second line that exited the region by 1300CST. The environment recovered producing fuel for more severe storms, starting with supercells 1800-2100CST with a line of storms moving east-southeastward across the entire Quad State after 1900CST, crossing through by midnight. Across the Quad State, this event produced the record for most tornado track miles in a single day in office history, along with the second most warnings issued in a day (just behind the May 8, 2024 event). Widespread straight-line wind and tornado damage resulted in over 100,000 customers without power across the Quad State.

For the morning, MLCAPE values at 0700CST were 1000-2500 J/kg in SE Missouri. Effective bulk shear was 40-50 kts with STP of 1-3. Precipitable water was 1.6-1.9 inches, allowing for torrential rainfall rates.

The morning round of storms produced widespread straight-line wind damage across the southernmost portions of SE Missouri, especially Ripley to Stoddard Counties. Three strong tornadoes occurred during the early morning in SE Missouri. The first was a long-track EF-2 tornado beginning in Oregon County, then crossed the entirety of Ripley County before lifting on the SW side of Poplar Bluff. A destructive downburst in Dexter transitioned into an EF-2 tornado that tracked northeastward to southeast of Morley in Scott County. An EF-3 tornado that began in far eastern Stoddard County moved northeastward through Sikeston to Diehlstadt with widespread damage in Sikeston. One person (43m, indirect) in Southeast Sikeston lost his life due to a falling tree branch during cleanup. Another person (51f, indirect) in Morehouse died as a result of an unattended candle, used for lighting during the resulting power outage, causing a house fire. Flash flooding occurred in several counties in SE Missouri as a result of high rain rates with the first round of storms, with late morning storms extending flood duration. A majority of Ripley, Butler, Stoddard, and New Madrid Counties were without power as of late morning, with significant outages also occurring in Wayne, Scott, and Mississippi Counties.

Heading into the evening, MLCAPE values at 1800CST were 3500-4500 J/kg in SE Missouri. For SE Missouri, effective bulk shear rose to 45-55 kts, with SRH around 200-250 m2/s2 and STP of 2-4. 0-1 km shear was 15-20 kts. Mid-level lapse rates were 7-7.5 C/km. DCAPE of 1200-1500 J/kg provided ample opportunity for downburst winds.

Late afternoon to early evening supercells were mainly in S Illinois and W Kentucky. The few in SE Missouri approached far western counties. After several chaser videos of tornadoes west of Carter County, the cold front caught up to the storm and Carter County primarily had straight-line wind damage as a result, with a brief EF-0 tornado. Another tornado, an EF-1, entered Bollinger County southeast of Marquand. Several straight-line wind reports were received, along with more flash flooding as lingering high water and saturated soils from the day were quickly reinvigorated. 2-5 inches of rain fell across the southern two rows of counties, with some of the highest rainfall totals near the Black River and south of Cape Girardeau. More power outages occurred with Carter and Bollinger County outages, along with the seven counties from the morning with substantial outage numbers, continuing through the night. The Black River briefly flooded in Poplar Bluff following this storm.