03/10/2026
Forecast confidence continues to increase that a favorable environment for strong to severe thunderstorms will develop Tuesday afternoon and evening across parts of northeast Missouri into central Illinois.
A strengthening storm system moving out of the Plains will advance a cold front eastward into a warm and increasingly humid air mass. Southerly winds ahead of the front will transport Gulf moisture northward, allowing dew points to rise into the middle and upper 60s. This increasing moisture, combined with daytime heating, will create a highly unstable atmosphere supportive of vigorous thunderstorm development.
At the same time, winds will strengthen and change direction with height, producing strong wind shear. This shear is a key ingredient for storm organization and will support clusters of severe thunderstorms capable of maintaining intensity as they move eastward through the evening.
The corridor where atmospheric ingredients overlap most favorably currently appears to extend from northeast Missouri into west-central and central Illinois. The most favorable zone for organized severe storms is near and east of the Mississippi River, including communities such as Quincy, Macomb, Galesburg, Peoria, and toward Bloomington. This region will be closest to the advancing cold front while remaining firmly within the warm, unstable air mass.
Areas farther west into northeast Missouri may still experience thunderstorms, though storm coverage could be more scattered initially, with organization improving as activity tracks east into Illinois where environmental conditions become more supportive.
Thunderstorms are expected to develop between approximately 5:00 PM and 9:00 PM and then track northeast through the evening hours.
Eastern Iowa remains in a Level 1 risk for strong thunderstorms, where a few storms could approach severe limits. Far southeast Iowa is included in a Level 2 risk, indicating scattered severe thunderstorms are possible. Farther east and southeast, a Level 3 risk is in place, including a hatched area highlighting an enhanced potential for tornadoes, large hail, and damaging winds. Forecast trends suggest this risk area may be refined or upgraded as newer data becomes available.
A developing surface low over Illinois will act as the primary driver of storm organization. Extending east from the low is a warm front separating cooler air to the north from warmer, more humid air to the south. As this boundary lifts northward, it allows moisture-rich air to expand across Illinois and surrounding states, providing additional fuel for thunderstorms.
The intersection of the warm front, cold front, and surface low — commonly referred to as the “triple point” — often becomes the focus for the most organized and intense storms. This zone supports strong atmospheric lift, converging surface winds, and increasing wind shear, all of which promote storm rotation and strengthening. Current projections place central Illinois near this key intersection, making it an area to monitor closely.
Trailing southwest from the low is the advancing cold front, which marks the leading edge of cooler, denser air. As this front moves into the warm sector, it forces warm air to rise rapidly — a key mechanism for thunderstorm initiation.
While small shifts in the placement of these features will determine where storms intensify most, this pattern is a classic signal of an atmosphere becoming increasingly supportive of organized severe weather.
Additional updates will be provided as new data helps refine timing, location, and storm intensity expectations.
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