MOUNT VERNON, ILL. — New supercells are spotting along what forecasters are calling a Tail End Charlie setup this evening, Sunday, June 21, as the first line of storms weakens and broadens, allowing fresh cells to form off the southwest flank of the boundary near Mount Vernon and Olney between 5 and 6 p.m. CDT.
Weakening First Line Opens Door for New Supercells
As the first line of storms weakens and broadens out, it is allowing cells to form off the southwest flank of the boundary. This setup can lead to rapid development for supercells as they tap into better thermodynamics and wind energy across south central Illinois.
Elevated Tornado Threat Where Boundary Stalls
Forecast guidance is showing an elevated tornado threat where the boundary can stall along the Interstate 64 corridor, stretching through Mount Vernon and toward Olney. Forecasters say this is an interesting trend worth watching closely as the evening progresses.
High Probability Window Centered Near Mount Vernon
Tornado probability guidance shows the highest likelihood, in the 50 to 90 percent range, centered directly over Mount Vernon between 5 and 6 p.m. CDT, with elevated probabilities extending out toward Effingham, Greenville, and Olney. Radar simulation guidance for 6 p.m. shows strong, organized cells already tracking near Mount Vernon, Kinmundy, and toward Norris City.
Storm Coverage Team Positioned Across the Region
Forecast teams are positioning across the threat area as conditions evolve, with coverage based near Olney and a command center handling broadcast updates later today and into tonight. Residents across south central and southeast Illinois, including Mount Vernon, Olney, Effingham, and surrounding communities, are urged to stay weather aware through the evening as this setup continues to develop.
Stay with GordonRamsayClub.com for the latest updates.
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