textproduct: Kansas City/Pleasant Hill

KEY MESSAGES

- Hazardous / prolonged heat continues, with broader relief mid-late week. - Extreme Heat Warning remains in effect through 8 PM for Kansas City Metro and immediately surrounding counties.

- Additional short-duration heat headlines may be possible Tuesday as renewed heat briefly surges back across Missouri.

- A SPC Marginal Risk (Level 1 of 5) for severe storms across much of the area. Main concerns for damaging wind gusts and hail.

DISCUSSION

Issued at 334 AM CDT Sun Sep 6 2026

Summary:

The large scale pattern evolution across CONUS remains a generally broken record, with continued high confidence in its evolution over the next few days. Just peek the LREF 500mb spreads for confirmation in that regard. The existing Omega Block pattern will finally begin to break down later today and into the work week, but substantial and widespread relief from the existing heat is unlikely before mid- week. In fact, a brief resurgence of heat is expected Tuesday. In the more immediate, chances for showers and storms remain today, including the potential for a few strong to severe and even some localized heavy rainfall.

Heat and Eventual Relief:

With the mid-level ridge entrenched over central CONUS, the immediate area unsurprisingly remains very quiet at the moment. The advertised cool front has made its way into and across much of the CWA, as seen by the light E to NE winds. Unfortunately for western areas of the CWA though is that notable relief (cooler temps and lower dew points) remain displaced further east. In fact, there is actually a ribbon of enhanced dew points across the state currently with the drier airmass yet back into Illinois. This will help, to some degree, set the table for shower/storm chances later today, but more on that in a minute.

The large surface high responsible for the easterly winds will continue to drop into the Great Lakes Region, but given its position, remains unexpected to push much additional relief across the state as it should effectively stall in/around the Kansas-Missouri border. This will result in temperatures today ranging from the upper 80s to low 90s in NE Missouri to more of the same mid-upper 90s to around 100 for western and central Missouri and heat index values approaching 105 to 110. Monday temps may be a couple degrees cooler, but still seasonally well above normal, as the easterly winds struggle to provide much tangible temperatures or dew point relief beyond eastern Missouri. As the Omega Block breaks down, the mid- level ridge shifts back eastward and begins to flatten, heat does briefly surge back on Tuesday when 850mb temps peak. That may yield yet one more day in the mid-upper 90s to 100 for much of the CWA. Given the above, Extreme Heat Warnings remain for areas around/south of Highway 36 through today/Sunday and in/around the Kansas City metro through Tuesday. An additional short duration headline for areas outside of the Kansas City metro counties may be considered for Tuesday.

By Wednesday, the western CONUS cutoff low will have tracked into the Canadian Plains, flattening the mid-level ridge. Its attendant surface low will have pushed a cold front across the Northern to Central Plains, likely to approach northern Missouri by Wednesday morning. There remains a little uncertainty in timing and how quickly it pushes southward across the state, which may result in a bifurcated CWA when it comes to highs Wednesday. Regardless, by Thursday more seasonable temperatures are anticipated for most, while southern areas toward central Missouri may remain a few degrees above normal. Southerly winds return to end the week into the weekend, likely to bounce temperatures back warmer a few degrees but not to the extent we have experienced of late.

Shower and Storm Chances:

For today, an interesting evolution in CAM guidance overnight and early this morning. HRRR/RAP guidance has tended to scale back the area coverage and potential for air-mass convection this afternoon. Now largely relegating those opportunities just W and SW of the CWA. This appears to be at least partially in response to anticipated cloud cover overspreading the area from existing Nebraska convection, which would temper peak mixing. Recent HRRR runs depict more cloud cover over eastern Kansas than is reality, areas in/around KC Metro may yet see some air mass thunderstorms. Any such storms would be within an environment characterized by weak wind profiles and sizable inverted-V (large DCAPE) profiles. This should yield a primary threat for strong to damaging winds from evaporatively enhanced downdrafts and brief non-severe hail during peak heating. Additionally, the aforementioned Nebraska convection is expected to continue into Iowa and given the position of the mid- level ridge axis and CAPE gradient, may drift down into northern Missouri. Recent CAM trends suggest much of the activity remains in Iowa given the more E to ESE deep layer sheer/steering profiles, but cannot rule it out especially should a cold pool/outflow move into the area. Damaging winds would likely remain the primary threat, but depicted better deep (speed) shear could allow for a severe hail threat as well. There is an SPC Day 1 Marginal Risk for severe storms given all of the above. There is also a WPC Excessive Rainfall Slight Risk that noses into NW Missouri, which would rely on slow moving and/or training area of storms.

Another opportunity for precipitation moves through the area mid- week, with the cold frontal passage. While shear profiles appear supportive of organized convection, frontal strength and timing will play a factor in any strong/severe potential. For now, suffice it to say additional shower and storm chances are anticipated during this time frame.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 617 AM CDT Sun Sep 6 2026

VFR conditions prevail to begin the TAF period, but the potential for non-VFR conditions enters the conversation this afternoon / after around 20z and may continue to around 06z before subsiding. Guidance continues to grapple with the coverage of any air mass type storms, but has suggested those chances are primarily relegated W and SW of the TAF sites. This would would turn primary chances for thunderstorms to progression of current activity or outflows from Nebraska (and eventually Iowa). Given the lingering uncertainty in coverage, have opted for PROB30 mentions at all sties. Otherwise winds remain out of the E to SE up to around 10 kts daytime and through the remainder of the period.

EAX WATCHES/WARNINGS/ADVISORIES

MO...Extreme Heat Warning until 8 PM CDT Tuesday for MOZ028-029-037- 043-053. Extreme Heat Warning until 8 PM CDT this evening for MOZ020>022-030-031-038>040-044>046-054. KS...Extreme Heat Warning until 8 PM CDT Tuesday for KSZ025-057-060- 103>105. Extreme Heat Warning until 8 PM CDT this evening for KSZ102.