textproduct: Topeka

KEY MESSAGES

- Patchy valley fog early this morning, mainly in low-lying areas near rivers and streams, then sunny and seasonably mild with highs in the mid 70s and light winds.

- A dry and gradually warmer pattern persists through much of the week, with highs trending into the upper 70s to low 80s by midweek and no meaningful precipitation chances.

DISCUSSION

Issued at 332 AM CDT Sun Oct 4 2026

Early-morning observations across northeast Kansas show a classic radiational cooling setup with clear skies, light winds, and cool temperatures in the upper 40s to low 50s. Shallow fog and mist have developed in some valleys and near area rivers, particularly where soils remain moist from recent heavy rainfall and winds are calm. Surface pressure remains high, indicative of a broad surface ridge centered over the central Plains.

Short-term guidance support rapid erosion of any fog shortly after sunrise as mixing increases. Once fog clears, skies will be mostly sunny across the entire forecast area with only thin high clouds possible on the periphery of the ridge. Highs this afternoon should reach the low to mid 70s in most locations, running near to slightly below early October normals. Winds will remain light, generally north to northeast at 5 to 10 mph during the morning, veering more easterly or variable later in the day as the surface ridge shifts east. Dew points have fallen into the 40s and low 50s, so the air will feel noticeably drier than recent days.

Tonight, clear skies, light winds, and continued dry air will again favor efficient radiational cooling. Lows are expected to fall into the upper 40s to low 50s area-wide, with the coolest readings in traditional cold pockets of north-central Kansas and sheltered valleys along the Kansas and Republican Rivers. Another round of patchy valley fog cannot be ruled out toward daybreak Monday, but coverage should remain limited and primarily confined to low-lying areas.

From Monday through Wednesday, large-scale pattern evolution features a strengthening midlevel ridge over the central U.S. while the primary storm track remains displaced to the north over the northern Plains and Great Lakes. At the surface, high pressure gradually slides east, allowing a more consistent southerly component to develop in the low-level flow across Kansas. This will support a gradual warming trend and slow return of moisture. High temperatures are expected to climb from the mid to upper 70s Monday into the upper 70s to low 80s Tuesday and Wednesday. Skies should remain mostly clear to partly cloudy, and forecast guidance shows little in the way of organized lift or moisture convergence over the area during this period. As a result, precipitation chances remain near zero and any cloud cover will be tied mainly to passing high clouds or weak warm advection layers.

The Thursday through Saturday period continues to show above-normal confidence in a dry forecast. Ensemble and deterministic guidance maintain the ridge either overhead or only slightly flattened by weak shortwaves passing well north of northeast Kansas. Low-level southerly flow increases somewhat, supporting highs in the low 80s for many locations late in the week, with perhaps mid 80s in parts of north-central and central Kansas if mixing is efficient. Dew points rise into the 50s and low 60s but remain insufficient, in the absence of stronger forcing, to support more than isolated, low-probability showers or thunderstorms along any weak boundaries. Current indications suggest deeper moisture and stronger ascent remain focused well away from the area through at least next weekend.

AVIATION /12Z TAFS THROUGH 12Z MONDAY/

Issued at 500 AM CDT Sun Oct 4 2026

VFR at all TAF sites through the TAF period. Some patchy, very low- lying fog has developed in the river valleys and occasionally is registered on observations, but likely not leading to visibility restrictions above the first several feet off the surface.

TOP WATCHES/WARNINGS/ADVISORIES

None.