textproduct: Kansas City/Pleasant Hill

KEY MESSAGES

* Strong to severe thunderstorms may develop along and south of I-70 later Sunday evening. The strongest storms would be capable of producing damaging winds, large hail (2"+ possible, mainly south of the Kansas City metro), and potentially an isolated tornado. Heavy rainfall could lead to localized flooding.

* Lingering showers and storms early Monday. Low-end severe threat Monday morning for damaging winds and hail as MCS continues to progress through Missouri. Heavy rainfall could also be a hazard.

* Hot and humid Monday with heat indices in the 90s. Apparent temperatures to be reflective of actual air temperatures in the 80s starting Tuesday, providing a few days of relief.

DISCUSSION

Issued at 853 PM CDT Sun May 31 2026

Evening/overnight storm potential tonight into early Monday morning remains the most pressing aspect of the forecast period. Over the course of the day, instability has grown appreciably, with recent SPC mesoanalysis indicating a 3500-6000 J/kg SBCAPE gradient from the northern portions of the Kansas City metro into the far southern portions of the CWA. ACARS soundings out of KMCI continue to depict a stout capping inversion with multiple failed attempts at convection in eastern Kansas observed via satellite. A diffuse outflow boundary extending from central Kansas into south-central Missouri has been the primary area of focus for these initiation attempts, but as of about 800 PM CDT, only one remotely successful updraft has been able to form in Douglas County, KS. Isolated development will continue to be possible over the next 1-2 hours, but more widespread convection will likely have to wait for improved mid/upper-level support, namely in the form of CVA as a shortwave moves through the flow aloft. Initially, storms are expected to be discrete and capable of all severe hazards. High resolution guidance points to over 4000 J/kg MUCAPE and around 1000 J/kg of CAPE in the HGZ, with values nearing 1500 J/kg south of I-70. In this environment, discrete storms could produce very large hail. Despite poor low-level flow overall, the potential for cell and boundary interactions in such a highly unstable environment supports an isolated tornado threat. PWATs > 1.5" across the area provides a heightened flood/flash flood threat overnight, mainly along and south of I-70 where the greatest moisture convergence is colocated with the strongest updraft potential. Soils across southern and central Missouri have reduced infiltration capacity due to earlier rainfall, further heightening flood concerns in these locales. As a weak low-level jet protrudes into the area tonight, storms will be encouraged to grow upscale as they move into central Missouri. With quite a bit of instability persisting into the overnight hours, the severe threat will continue through much of the early morning as storms progress east. Flood/flash food concerns will also remain with potential training as the event progresses.

Around sunrise, the main storm system is expected to have exited the eastern fringes of the CWA, though some lingering precipitation is possible. Light winds, clearing sky conditions, and small dewpoint depressions could allow patchy fog to develop in the early morning hours, especially further north and west behind the MCS. Surface dewpoints look to return to the low/mid 70s, leading to a muggy first day of June. Northerly and easterly surface flow that sets in behind the surface low with ridging building overhead. This will provide some reprieve as the area loses its connection to Gulf moisture, keeping uncomfortable heat indices at bay until late in the week when surface flow becomes increasingly southerly once again as an upper/mid level trough approaches the region on Thursday. This system will bring another active period of weather to the area Friday through the weekend.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/

Issued at 621 AM CDT Mon Jun 1 2026

VFR conditions expected to prevail across the sites through the period. In the wake of overnight storms, there are some pockets of light fog, which may briefly affect sites such as KMCI and KSTJ. Given the scattered and brief expected nature, if at all, have opted to keep VFR prevailing. Otherwise, initially light and variable winds give way to prevailing N to NE through the day, up to around 10 kts.

EAX WATCHES/WARNINGS/ADVISORIES

MO...None. KS...None.