Central Plains and Midwest Facing Potentially Significant Severe Weather Event Next Wednesday as ECMWF Shows Extreme Wind Shear and High Summertime Instability

KANSAS CITY, MISSOURI — A potentially significant severe weather event is on the horizon for next Wednesday June 18 across the Central Plains and Midwest, with the ECMWF IFS 850mb analysis valid Thursday June 18 at 00z showing an extreme environment featuring strong wind shear and very high summertime thermodynamic values concentrated across a circled zone covering the central United States.

ECMWF IFS Highlights Extreme Environment for Mid-June

The ECMWF IFS 850mb winds, heights, and dewpoint analysis run Friday June 12 at 18z and valid Thursday June 18 at 00z shows a concentrated area of concern circled across the central plains. The 850mb wind field within the circled zone shows strong directional shear with veering wind barbs indicating a classic severe weather-favorable profile developing across the region by mid-week.

Forecasters are describing this as a pretty extreme environment for mid-June, with strong wind shear in place simultaneously with very high summertime thermodynamic values. That combination is what produces the most impactful severe weather setups during the summer months.

Strong Wind Shear and High Thermodynamics Overlap Next Wednesday

The overlap of robust 850mb wind shear and elevated summertime instability across the circled zone is the key ingredient combination drawing forecaster attention for next Wednesday. When strong shear and high CAPE values converge in mid-June, the potential for organized severe convection including supercells, damaging winds, large hail, and tornadoes increases significantly.

Forecast confidence remains limited at this range with changes expected as the event gets closer, but the signal is strong enough to warrant early awareness for communities across the central plains and Midwest.

Early Heads Up Warranted for the Central Plains Region

While the forecast will continue to evolve through the week, the ECMWF is consistent enough at this range to put residents across the central plains on early notice. Anyone in the general area of the circled zone covering Kansas, Missouri, Nebraska, Iowa, and surrounding states should monitor updated forecasts daily as Wednesday approaches.

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