textproduct: Kansas City/Pleasant Hill

KEY MESSAGES

- Patchy to dense fog this morning.

- Near seasonal temperatures (afternoon highs in the mid to upper 80s) expected for today through Friday.

- Hot and more humid conditions likely this weekend into early next week.

DISCUSSION

Issued at 332 AM CDT Wed Aug 26 2026

Current H5 analysis depicts a 598 dam H5 high centered over New Mexico with attending mid/upper ridging extending northward all the way into Alberta, with an upper trough extending from Ontario into the Upper Midwest. This continues to yield northwesterly flow aloft over the region. At the surface, a very relaxed pressure gradient has resulted in calm winds, and with solid moisture return between yesterday afternoon and this morning pulling dew points back to the upper 60s to lower 70s and saturating the boundary layer, patchy to dense fog has developed across the region. The most dense fog, where visibility is on the order of quarter to half mile, is across far NW Missouri, which has prompted the issuance of a dense fog advisory. Fog should mix out by around 9 am this morning. By later today, a surface low associated with the upper trough across the Upper Midwest will move eastward across Ontario, with a trailing cold front moving northwest to southeast across the CWA. This will yield a bit of a gradient for high temperatures today, with high temperatures in the mid 80s across northern MO where the front will move through later this morning and highs in the upper 80s to lower 90s further south where the front will arrive a bit later this afternoon. Drier air will filter in behind the front, with dew points projected to fall to the mid 60s by this evening. For tomorrow, seasonal temperatures are expected, but with dew points in the upper 50s it should be a relatively pleasant day and evening. Temperatures may increase a degree or two on Friday, but humidity should remain relatively comfortable.

By this weekend, the upper ridge axis is progged to drift further east as an upper trough comes ashore across the Pacific Northwest (and will also flatten out the ridge). This should lead to increased mid level heights and warmer 850 temps, translating to surface high temperatures into the lower to mid 90s for Saturday. By Sunday and Monday, the center of the H5 high shifts eastward over the region. The upper trough will make its way across the Intermountain West and into the Northern Plains, with southerly low level flow increasing across our CWA in response and ushering in some moisture return. Highs on Sunday are forecast to reach the mid 90s for most locations, and highs in the lower to mid 90s on Monday. However, recent trends in the guidance has lowered temps and dew points a bit, and the current grids reflect max heat indices on Sunday and Monday in the mid to upper 90s (rather than 100 to slightly above 100 this time yesterday). Shower and thunderstorm chances return to the forecast Sunday night into Monday morning (20 to 40%) and again Monday night into Tuesday morning (20 to 50%).

AVIATION /00Z TAFS THROUGH 00Z THURSDAY/

Issued at 1058 PM CDT Tue Aug 25 2026

Skies will continue to clear overnight. Some areas may see fog, and expected to fog in along the Missouri River Valley which will impact the STJ terminal. A few clouds may start to clip eastern KS and western MO by the middle of Wednesday morning.

EAX WATCHES/WARNINGS/ADVISORIES

MO...Dense Fog Advisory until 9 AM CDT this morning for MOZ001-002- 011-012-020. KS...Dense Fog Advisory until 9 AM CDT this morning for KSZ102.