ILLINOIS — An organized severe storm threat is developing for Monday, May 18, as a cold front pushes into a corridor of warm and unstable air stretching from Arkansas and Oklahoma northward through Missouri, Illinois, Indiana, and into Wisconsin, bringing damaging winds and large hail as the primary concerns.
Forecasters are also noting that the tornado risk for Monday is probably not zero, adding an additional layer of concern for residents across the outlined threat zone.
Cold Front Pushing Into Warm Unstable Air Triggers Severe Storm Setup Monday
A cold front arriving Monday, May 18 will collide with abundant warm and unstable air already in place across the region, creating the necessary ingredients for a few organized severe storms to develop during the afternoon and evening hours.
The ECMWF model initialized Tuesday May 12 shows significant atmospheric instability values across the threat corridor, with MUCAPE readings climbing well into the higher ranges across Arkansas, Missouri, and southern Illinois by 1:00 PM CDT Monday.
This level of instability combined with the approaching cold front is what forecasters are pointing to as the primary driver behind Monday’s organized severe weather potential.
Damaging Winds and Large Hail Identified as Primary Threats Monday May 18
Forecasters have identified damaging winds and large hail as the two primary threats with Monday’s severe storm setup across the outlined zone covering Chicago, St. Louis, Springfield, Peoria, Davenport, Milwaukee, Fort Wayne, Indianapolis, Memphis, Little Rock, and Fayetteville.
The threat zone spans a large and densely populated corridor from northern Texas and Oklahoma northeastward through the heart of the Midwest, putting millions of residents within range of potential severe weather impacts.
Any storms that develop Monday afternoon have the potential to become organized and capable of producing significant wind and hail damage across multiple states simultaneously.
Tornado Risk for Monday Described as Probably Not Zero
While damaging winds and large hail remain the headline concerns, forecasters have explicitly stated that the tornado risk for Monday, May 18 is probably not zero at this range.
The exact tornado potential remains difficult to pin down with confidence given the current forecast range, but residents across the threat zone should not rule out the possibility of tornado activity alongside the wind and hail threats.
Forecasters have committed to providing additional updates as Monday approaches and the storm setup comes into sharper focus over the coming days. Stay with GordonRamsayClub.com for the latest updates.
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