OKLAHOMA CITY, OKLAHOMA — A return to more organized and potentially significant severe weather activity across the Plains appears increasingly likely by mid to late June 2026, with the CFSv2 Week 3 Accumulated Supercell Composite Parameter showing a robust and expansive signal across the central and southern United States for the June 12 through June 19, 2026 timeframe as a more active troughing pattern develops across the region.
CFSv2 Week 3 Shows Intense Red Supercell Signal Across Oklahoma, Kansas and Missouri Corridor
The CFSv2 Week 3 Accumulated Supercell Composite Parameter valid from 1200Z June 12, 2026 through 0600Z June 19, 2026 shows one of the most expansive and intense supercell composite signals of the season across a wide corridor covering Oklahoma, Kansas, Missouri, Nebraska, Iowa, and extending into the mid-South. The deep red shading reaching values of 25 to 30 on the color scale is spread broadly across this entire multi-state zone, indicating a highly favorable atmospheric environment for supercell thunderstorm development across the heart of tornado alley during this mid-June window.
The signal is notably broader and more widespread than the Week 3 supercell composite outputs seen in recent weeks, suggesting the mid-June pattern shift toward more active troughing will deliver a significantly more organized and dangerous severe weather environment than the relatively suppressed pattern affecting parts of the plains in late May.
Active Troughing Pattern Developing Across the Plains Driving the Mid June Severe Weather Signal
The 500 mb upper-level analysis map showing the large-scale atmospheric pattern behind this severe weather signal reveals an active troughing configuration developing across the northern and central plains, with tighter height contours and more energetic flow patterns visible across the Pacific Northwest through the central United States corridor. The 570 dam height contour and tighter isobar spacing visible across the northern plains and upper Midwest on the upper-level map confirms the more amplified and active pattern that forecasters are pointing to as the driver of the increased severe weather potential heading into mid-June.
Purple and blue upper-level colors extending across the northern tier of the map from Seattle through Regina and Winnipeg indicate the presence of a stronger and more positively tilted upper trough feature compared to the relatively flat and inactive pattern that has dominated parts of the plains through late May.
Broad Blue Elevated Signal Extends From the Dakotas Through the Ohio Valley and Mid Atlantic
Beyond the intense red core across the southern and central plains, the CFSv2 Week 3 map shows an expansive blue elevated supercell composite signal spreading across a much wider area of the country from the Dakotas and Minnesota through Iowa, Illinois, Indiana, Ohio, and into the mid-Atlantic region. This broader elevated zone indicates that the mid-June severe weather potential extends well beyond just the traditional tornado alley corridor and may affect a much larger geographic footprint across the central and eastern United States during the June 12 to 19 window.
Residents across the central plains, southern states, and mid-South should begin monitoring long-range severe weather forecasts closely as the mid-June timeframe approaches.
Stay with GordonRamsayClub.com for the latest updates.
Leave a Reply