textproduct: Kansas City/Pleasant Hill

KEY MESSAGES

- Strong to Severe Storms Monday Late Afternoon and Evening

- Additional Rain Chances Middle of This Week

- Seasonable Temperatures

DISCUSSION

Issued at 201 PM CST Sun Nov 1 2026

Mid to upper-level synoptic pattern features an amplifying ridge axis that is currently over the Central Plains and moving eastward, being driven by a deep trough digging toward the Four Corners Region this afternoon. For the lower Missouri River Valley for the remainder of Sunday, a few breaks in cloud cover may be possible with mid-level AVA generating some subsidence. However, flow around 700mb continues to bring in plenty of moisture, which will limit the ability to completely clear the overcast and misty conditions across the forecast area. The ridge axis races east of the Mississippi River Valley overnight, as the trough acquires a negative tilt and lifts out of the Four Corners Region toward the Rockies. Mid-level height falls will extend eastward into the lower Missouri River Valley. The strong dCVA into the Front Range and High Plains will foster lee cyclogenesis for most of Monday, tracking a strong cyclone into the Central Plains. Low-level flow from central Kansas into the Mississippi River Valley will turn southerly, and increase theta-e transport, with a notable jump in dewpoint temperatures by Monday afternoon. For our forecast area, this will start to push a warm front northward, bringing with it increasing isentropic upglide and perhaps some enhanced mid-level lift from any vorticity lobes that eject eastward into the central CONUS. For eastern Kansas to Central Missouri, this will likely keep dense cloud cover, unless something Sunday evening helps to drastically clear it. The better clearing within this synoptic pattern will be in south-central Kansas and regions southward where a more notable EML is noted. Scattered showers are likely along the nose of stronger isentropic upglide Monday morning through early afternoon. At this time, instability does not look overly impressive, with HREF mean MUCAPE values struggling to reach 1000 J/kg. However, depending on how faster the 500mb trough axis moves, mid-level cooling may help to steepen mid-level lapse rates by the early afternoon, which may produce some thunderstorm activity. An isolated severe storm prior to 20z is possible if there is any kind of mesoscale clearing that can help locally destabilize the boundary layer, as deep layer shear with strong mid-level let jet will be present (0-6km bulk shear values above 40kts possible over the warm sector). But, overall forcing will be minimal and the lack of insolation may inhibit deep convection.

Late afternoon, the rate of mid-level height falls increases, along with convergence along the deepening cyclone and its trailing cold front. Continued theta-e advection will provide more moisture into the area, and will help bring in a somewhat more unstable airmass that could see SBCAPE attempt to near 1000 J/kg. The instability is the greatest source of uncertainty with how the severe threat will play out for eastern Kansas and western Missouri late afternoon Monday and through the evening. If there is any kind of localized subsidence prior to sunset that destabilizes the boundary layer with dewpoints in the mid 60s, mid-level cooling that steepens lapse rates will readily increase CAPE for SB and ML parcels. Throw in the increasing forcing and deep layer bulk shear magnitudes upwards of 50kts, storms will have what they need to go severe, even if their tops are under 35kft. If the boundary layer does not rapidly destabilize, it may take a longer for activity to develop, but there should be enough instability and lift to help some kind of organized activity get going, with the uncertainty being how long it could remain strong. If there is enough destabilization early, storms could develop over east-central Kansas as early as 20z, and then move eastward. CI may have to wait until after 23z though. The evolution of storm mode, specifically the timing of it, will determine the most prevalent storm hazards, along with its longevity. If discrete storms are able to initiate in eastern Kansas and western Missouri in the warm-sector with enough ML CAPE, a supercell storm mode is possible given the strong vorticity in the lower to middle portions of the troposphere. Current CAM hodographs demonstrate notable cyclonic curvature in the 1-4km layer, and could make an argument that it extends up to 6km. While storms may not be as tall as warm-season cores, the shear environment could play a role in mitigating instability insufficiency. Low-level SRH is set to be quite robust within the region surface troughing working to back surface winds, with 0-500m values above 100 m^2/s^2, and near 150-200 m^2/s^2 in the 0-1km layer. If 0-3km CAPE values can reach above 50 J/kg, this should be enough to support low-level mesocyclone that could present a tornado threat. The depth of the storms likely limits their longevity. The wind threat with discrete convection would likely be tied to any kind of rear-flank downdraft development. This reflects the conditional threat for discrete storms though. With the insufficient instability expected earlier in the afternoon, this scenario will be difficult to realize. The more likely scenario will be discrete convection developing in south- central Kansas, then growing upscale into an MCS or QLCS along the cold front through the evening, that then rolls into the area. Through eastern Kansas, there should be just enough instability to bring a strong line or clusters storms toward the KS-MO state line. Normal MCS or QLCS wind threat will exist in this very favorable deep layer shear environment, fostering the development of strong cold pools and maintaining balance. With deep layer shear present on both of sides of the boundary, and anticipated low-level jet, surges within the line are possible that will help to enhance to winds. The 0-3km bulk shear will also being very strong, well above 30 kts even into the warm-sector, along with enough 0-3km CAPE that could promote mesovortex generation along surges that are oriented from northwest to southeast, enhancing winds and developing brief a brief tornado. Hail threat should be fairly minimal after upscale growth. The first line should start to push east of the forecast area by 04z, but another vorticity lobe and dCVA may happen behind the cold front that could result in post-frontal convection that may goes past 06z before it exits into eastern Missouri. Depending on their inflow bases, uncertain how much a severe threat these storms would pose.

As for hydrology, QPF amounts are generally around 1.00 for an event total, with HREF probability matched mean values showing pockets of 1.75 in south of Hwy. 36. With the strong shear and progressive nature of this trough, storms should be moving at a faster enough to speed to limit training, therefore limiting flooding concerns. Heavier rainfall over urbanized areas may result in elevated levels of local creeks and streams.

The forecast for Tuesday and beyond will largely be tied to how the mid-level trough wraps up and if it becomes a closed-low system, with another trough potentially ejecting out of the Rockies. Current deterministic guidance depicts the wrap-around precipitation shield just missing our forecast area, remaining in southern Iowa and moving northeastward. Ensemble probabilities for measurable precipitation are also fairly low for most of the forecast area. Northerly flow will help keep high temperatures in the lower to mid 60s, with only upper 50s possible near the Iowa-Missouri state line.

AVIATION /18Z TAFS THROUGH 18Z MONDAY/

Issued at 1115 AM CST Sun Nov 1 2026

Moisture continues to push into the area and will allow cloud cover to continue. There may be some breaks this afternoon but bases will still be between 1 to 2 kft AGL. Most of the rain shower and thunderstorm activity Monday will hold off until after 18z.

EAX WATCHES/WARNINGS/ADVISORIES

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