EF3 Tornado — Johnson, Illinois

2024-05-26 · near Goreville, Johnson, Illinois

Event narrative

An EF-3 tornado began north of Goreville, IL, where a security camera at a house on Newton Lane captured the tornado's formation. Crossing I-57, the tornado snapped large tree limbs and damaged an outbuilding on Pulley's Mill Ln. The tornado was again filmed crossing I-24 northeast of Goreville. Along IL-37, the tornado did roof damage to two homes and snapped a few wooden power poles. Nearby trees suffered extreme damage, with debarking noted on a few trees near the intersection of IL-37 and Orchared Ln, along with numerous large trees snapped. To the east on Orchard Ln, a home suffered a direct hit by the tornado, with the roof being removed and most of the exterior walls collapsed. A nearby outbuilding was also destroyed, along with several large snapped trees. As the tornado approached the Eagle Point Bay subdivision on Lake of Egypt, it snapped several large trees and wooden electrical poles on Deaton Rd and Greentree Dr. Two manufactured homes were severely damaged or destroyed. One resident here suffered broken bone injuries. Another house had its roof uplifted slightly and was slightly moved off its foundation. Continuing east-southeast into the Eagle Point Bay subdivision, the tornado weakened then dissipated, doing mainly tree damage and minor roof damage to homes along and near John Able Dr and Thunderhead Dr. Peak winds with this tornado were estimated at 150 mph.

Wider weather episode

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 1000-1500 J/kg in S Illinois. Effective bulk shear was 40-50 kts with STP of 1. Precipitable water was 1.5-1.75 in. The morning storms mostly missed just south of S Illinois with some street flooding in Johnston City.

Heading into the evening, MLCAPE values at 1800CST were 2000-3500 J/kg in S Illinois. For S Illinois, effective bulk shear rose to 50 kts, with SRH around 150-250 m2/s2 and STP of 2-3.5. 0-1 km shear was 20 kts. Mid-level lapse rates were 7-7.5 C/km. DCAPE of 1200-1400 J/kg provided ample opportunity for downburst winds.

Three tornadoes occurred in S Illinois. Two of these were with the late afternoon to early evening supercells. An EF-3 in the Lake of Egypt area of Johnson County debarked some trees, damaged several homes in the Eagle Point Bay subdivision, and injured one person. An EF-1 tornado in Johnson and Union Counties ahead of the approaching cold front tracked southeastward to Buncombe. The third tornado, an EF-1, was with the cold front in the Grayville area, tracking into Gibson County, IN. The supercells produced several hail reports, with a 2 inch hail report near the Williamson/Saline County border. Training heavy rain produced significant flash flooding for the second time in a month in Saline County, focused on Harrisburg with U.S. 45 flooded and at least one water rescue. Rainfall amounts in Southern Illinois were 1-4 inches, with the highest amounts in Alexander/Pulaski County and along a line from Williamson to Gallatin County. Numerous trees and power lines were damaged with the supercells and the frontal passage. Late evening power outages amounted to roughly a third of Williamson, Union, Johnson, and Alexander Counties.

View location on OpenStreetMap → (37.5804, -89.0161)

Source: NOAA Storm Events Database, event_id 1185420. Narrative written by the NWS forecast office that issued the report.