textproduct: Topeka

KEY MESSAGES

- Late season heat persists through Labor Day weekend. Highs in the upper 90s, near 100 in north central Kansas, with heat indices of 100 to around 105.

- No Heat Advisory should be needed today. Thursday and Friday are the most likely days to reach criteria as it looks now.

- Warm lows in the middle and upper 70s keep record warm minimums in play through Thursday.

- The overall pattern may last into mid to late next week before a meaningful airmass change brings temperatures back to around normal.

DISCUSSION

Issued at 223 AM CDT Tue Sep 1 2026

The 00Z analysis shows a strong anticyclone centered over the southern into the central Plains with a compact low over the Canadian Prairies and the jet running along the international border. A trough is digging into the Pacific Northwest while Tropical Storm Edouard sits just off the Louisiana coast. WV imagery suggests dry and subsident air over the region beneath the ridge, with monsoon moisture streaming across the Desert Southwest into the Rockies. At the surface the weak quasi-stationary boundary that held northern Kansas a few degrees cooler Monday has lifted into Nebraska, leaving the entire area in the warmer air to the south. H85 temperatures in the middle 20s C supported yet another day with temperatures around 100 degrees at many area locations.

The forecast question this period continues to center on whether heat headlines will be needed and when, and it revolves around dewpoint uncertainty. Ensemble high temperatures remain tightly clustered in the upper 90s, near 100 across north central Kansas, with spread of only a few degrees through Saturday. Ensemble dewpoints are not as clear. The mean sits near 60 today, dips Wednesday in association with some of the deepest mixing of the week, then climbs into the middle 60s Thursday and Friday in association with southerly return flow and holds through the weekend. The member spread for Thursday and Friday runs from the upper 50s to the upper 60s, and that spread will ultimately factor into the headline decision making. Low 60s dewpoints yield heat indices near 100 and no advisory issue, but still hot and dry. Middle 60s, the current ensemble mean, push heat indices to 103 to 105. Upper 60s bring the 105 to 107 range. NBM heat index probabilities follow the same trend, with values above 100 likely Thursday and Friday, while 105 remains unlikely for most of the area but still possible across north central Kansas late week. Near- record warm overnight lows add to the overall concern with little cooling to start the day. Lows in the middle and upper 70s puts Topeka and Concordia on record warm minimum watch through Thursday morning. No headline is currently needed for today as confidence in the temperature forecast is high. With the depth of mixing and thus the distribution of moisture through the boundary layer dewpoints today should hold in the low to mid 60s.

The ridge still holds through the Labor Day holiday weekend. Ensemble mean mid level heights over Topeka dip slightly Thursday as a low amplitude northern stream disturbance passes well to the north of the area, then the ridge re-amplifies and builds directly over the central Plains Saturday through Tuesday with tight overall member agreement. H85 temperatures hold in the middle 20s C through the same period with no meaningful downward trend, and WPC cluster analysis keeps the ridge axis over Kansas in every cluster through Monday. That continues to argue against the NBM cooling trend for the weekend, which reflects widening spread in the tails rather than a shift in the mean, and highs were held in the upper 90s through Sunday and middle 90s on Labor Day. Rain chances remain minimal through Friday barring an unforeseeable mesoscale change to the going forecast pattern. Slight chances for precipitation return Saturday onward as the western flank of the ridge works east, possibly allowing smaller scale mesoscale complex activity to push into the area, but predictability is low at this time.

The overall weather pattern may finally change by mid to late next week as a more amplified Pacific trough swings through the northern Plains in the Thursday time frame. Ensemble mid level heights hold through Wednesday and then fall sharply, hinting at a frontal system working into the region. Meanwhile, H85 temperatures in the LREF drop several degrees C as well, which appears to be the first real cooling signal in the current guidance. Cluster analysis splits sooner, in the Tuesday time frame, between holding the ridge and flattening it. Either way, the signal is that a change in airmass may finally be on the way.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 538 AM CDT Tue Sep 1 2026

VFR conditions persist through the period. Winds increase from the SSW as mixing begins an hour or two after sunrise this morning with a few gusts through the afternoon. The LLJ may become slightly stronger again this evening and overnight especially around KMHK. Will need to monitor trends to see if criteria for LLWS are met but right now the overall impact appears to remain in the marginal concern category.

CLIMATE

Issued at 631 PM CDT Mon Aug 31 2026

Record highest minimum temperature information:

Record Forecast

September 2 Topeka 80, set in 2011 77 Concordia 79, set in 1929 78

September 3 Topeka 77, set in 1939 78 Concordia 80, set in 1947 79

TOP WATCHES/WARNINGS/ADVISORIES

None.