Northern Plains, Dakotas, Nebraska, Kansas, Iowa Face Active Supercell Pattern Through Late June Into July 11 as CFSv2 Long Range Models Show Strong Severe Weather Signal

RAPID CITY, S.D. — Long range CFSv2 model guidance is showing an active and potentially relentless severe weather pattern across the Northern Plains and central United States stretching from this week all the way through July 11, with strong model ensemble agreement on environments supportive of supercells across multiple consecutive week long windows.

June 21 Through 27 Already Showing Strong Supercell Signal

The first window, June 21 through 27, is already showing a strong supercell composite parameter signal across the central and southern Plains, with model ensemble members in broad agreement on an environment capable of supporting organized severe thunderstorms. The red shading on the CFSv2 guidance indicates the highest confidence areas for supercell supportive conditions this week.

June 28 Through July 4 Keeps Active Pattern Going

The second window from June 28 through July 4 shows the active pattern continuing across the Northern Plains, with the signal shifting slightly northward but remaining robust. Forecasters note this overlaps with the same period flagged in other long range guidance for elevated storm cluster risks across the Midwest and Ohio Valley.

July 5 Through 11 Extends Severe Threat Well Into Summer

The third window from July 5 through July 11 shows the active severe weather pattern persisting across the Northern Plains and Upper Midwest with no sign of letting up. This extended stretch of supercell supportive environments has prompted some forecasters to suggest tornado season could effectively last well into the summer of 2026.

Pattern Signal Unusually Strong for This Time of Year

The strength and consistency of the CFSv2 signal across three consecutive week long windows is noteworthy, reflecting a pattern that keeps returning to favorable supercell setups across the Plains and Northern tier states. Residents across the Northern Plains, Midwest, and central United States should expect an active and potentially dangerous severe weather stretch through at least mid July.

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