textproduct: Kansas City/Pleasant Hill

KEY MESSAGES

- Dry, breezy weather and enhanced fire weather concerns are expected today.

- Near, or above, record heat continues today and Tuesday.

- Strong to severe storms are possible Tuesday afternoon/evening. The primary threats are damaging winds and marginally severe hail.

- Shower/storm chances increase (75-95%) Tuesday evening into Wednesday morning, lasting through Thursday.

- Temperatures cool down into the upper 50s and low 60s by the end of the week.

DISCUSSION

Issued at 240 AM CDT Mon Oct 12 2026

A 500-hPa analysis shows mid-level ridging present over the central CONUS, with a high amplitude trough situated over the western CONUS and a shortwave along the East Coast. This pattern will continue to support near, or above, record temperatures today, with highs expected to be in the upper 80s and low 90s. At the surface, a frontal boundary is draped from the Upper Great Lakes back to a low pressure system that is developing in northeast CO and the NE panhandle. A broad area of high pressure is situated over the Gulf Coast. A tight pressure gradient between these two surface features will allow breezy (10-15 mph) southwesterly winds to continue through the early morning hours this morning across northern MO and northeastern KS with gusts up to 25 mph possible at times. The low pressure system is expected to move northeast through the day today, further tightening the pressure gradient and allowing winds to increase to 15-20 mph by the afternoon with gusts up to 35 mph. While the winds alone create elevated fire weather concerns given the dry antecedent conditions, afternoon RHs will only fall to the 35-50% range, so Red Flag Criteria is not expected to be met today.

As the low pressure system moves towards the Upper Great Lakes today, it will push a cold front across NE and IA. This front is expected to reach northwest MO this evening/overnight. The nose of a 30-35 kt LLJ will reach into southeastern NE and northwestern MO overnight, which may provide enough lift for a few showers to form along or behind the front through the early morning hours.

The progression of the front is expected to slow on Tuesday, with the front becoming nearly stationary across northern MO. Model guidance remain in poor agreement on where exactly this stall will happen, resulting in large spreads in forecast temperatures on Tuesday. However, the general consensus is for areas south of the front to be in the low 90s (making Tuesday the hottest day of this heat wave), while areas north of the front will see temperatures in the low-to-mid 80s. Southerly surface flow will also continue on Tuesday bringing Gulf moisture into the region. Dew points are expected to climb into the upper 60s and low 70s by Tuesday afternoon, which will actually bring heat indices in the upper 90s to near 100F into play, which is mind-boggling for mid-October.

Another result of the influx of boundary layer moisture will be the development of 1000-2000 J/kg of MLCAPE south of the frontal boundary Tuesday afternoon/evening. This will come in conjunction with 40-50 kts of deep layer shear. To the west, a mid-level trough will slide east over the Great Basin and lee cyclogenesis will occur in southeastern CO. With better synoptic support focused to the west of the local area, CAM guidance indicates that convective initiation should occur across central KS and areas south by mid-afternoon. The local area will be capped through much of the afternoon, however, the combination of diurnal heating and increasing synoptic support should allow the cap to erode through the day and convection appears likely along the frontal boundary by late afternoon/early evening. Mid- level lapse rates are not overly impressive (6.5-7 C/km), however, given the parameter space previously outlined, strong to severe storms appear possible, with the primary threats being damaging winds and hail up to 1" in diameter. This thinking aligns with the SPC Day 2 outlook, which outlines eastern KS and western MO in a Slight (Level 2 of 5) Risk with the remainder of northern MO in a Marginal (Level 1 of 5) Risk.

Continued ascent along the frontal boundary Tuesday night will lead to the development of widespread showers and storms by early Wednesday morning, lasting into Thursday. The presence of this precipitation makes the convective forecast for Wednesday a little uncertain. Model guidance indicates that at least some instability will be present, with shear values remaining elevated, so it seems as though at least some severe threat exists Wednesday afternoon/evening, though, the best parameter space should be on the southern periphery of the showers. SPC has outlined the far southern portion of the CWA in a Day 3 Marginal (Level 1 of 5) Risk, which matches this thinking.

Though model guidance diverges on the handling of the upper trough beyond Thursday, there is agreement that a cold front will sweep across the Central Plains Thursday afternoon/evening and high pressure will build in from the northwest bringing a cool down to the region. The current forecast calls for highs in the upper 50s and low 60s on Friday and Saturday with low falling into the 30s on Friday night.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/

Issued at 617 AM CDT Mon Oct 12 2026

VFR conditions are expected at all four terminals through the TAF period. Despite 40-45 kts within the lowest 2000 ft AGL early in the period, surface winds should be strong enough to keep LLWS concerns at bay. SSW winds will be around 15-20 kts with gusts up to 30 kts possible this afternoon. Gusts will weaken around sunset, but are not expected to fully subside until well into the overnight period.

EAX WATCHES/WARNINGS/ADVISORIES

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