Healthy Hail Cores Detected Along and South of Highway 136 Across Mason and Southern Fulton County, Illinois at 10:18 PM Monday May 4
MASON COUNTY, IL — Significant hail-producing storm cells were detected moving along and south of Highway 136 across Mason and southern Fulton County, Illinois at 10:18 PM Monday, May 4, 2026, with VIPIR hail radar showing likely and probable hail signatures concentrated across a corridor stretching through Havana, Manito, Mason City, and Delavan as intense storm cores pushed through the central Illinois region.
VIPIR radar imagery captured at 10:18 and 10:19 PM showed deep pink and magenta hail signatures blanketing a broad swath of the Mason and Fulton County area, with warning polygons outlined in yellow covering Havana, Manito, and the surrounding corridor where the most significant hail cores were tracked along the Highway 136 alignment.
Hail Cores Track Through Havana and Manito Corridor
The most intense hail signatures on VIPIR radar were concentrated across the Havana and Manito corridor, where likely and probable hail classifications were displayed across multiple storm cells moving through the region. The pink and magenta returns visible on hail radar indicated well-developed hail cores within the storms, consistent with hail of meaningful size capable of causing property and vehicle damage across communities positioned along the storm track.
Lewistown, Vermont, Astoria, and surrounding Fulton County communities to the west also showed hail signatures as the storm complex pushed eastward through the central Illinois region during the late Monday evening hours.
Radar Confirms Intense Storm Activity Across the Region
VIPIR base radar imagery captured at 10:19 PM confirmed the intensity of the storm complex moving through Mason and Fulton counties, with deep red and orange reflectivity cores concentrated across the Havana, Manito, Mason City, and Delavan corridor. The intense reflectivity returns were consistent with heavy rainfall and active hail production within the storm cells tracking along and south of Highway 136 through central Illinois.
Communities including Pekin, Tremont, Delavan, Mason City, Greenview, and Chandlerville all fell within the broader storm footprint as the cells continued their eastward push through the region toward Lincoln and the broader central Illinois corridor.
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