153 FXUS63 KTOP 231108 AFDTOPArea Forecast Discussion National Weather Service Topeka KS 608 AM CDT Tue Sep 23 2025
.KEY MESSAGES...
- Thunderstorms build into the area this morning, some of which could be strong and produce a brief damaging wind gust, and rain rates in excess of an inch an hour.
- Chances for showers and storms continue through the day Tuesday (50-60% chance) and into Wednesday (20-40%) before dry conditions return Wednesday night.
- Dry and mild conditions expected Thursday into early next week.
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.DISCUSSION... Issued at 159 AM CDT Tue Sep 23 2025
Two complexes of storms are converging on our area this morning. The first one, currently moving across southern Kansas is associated with surface trough and low-level jet. The second one, currently over southeast Nebraska is associated with cold pool surging south.
Models have been in good agreement with these features intersecting northeast Kansas by around sunrise. The threat for severe storms is very low and the window for any severe threat is very narrow. From around 5 am to 7 am CAMs continue to depict around 1,500 J/Kg of elevated CAPE and steep elevated lapse rates. However, with significant boundary- layer CIN in place, it would be a tall order for stronger wind gusts to reach the surface and with a lack of shear (20 knots or less of effective shear) hail is also not probable.
What is more likely is heavy rainfall. With that elevated instability and PWATs around 1.75 inches, rain rates in excess of an inch an hour are favored in stronger storms early this morning. Instability and stronger lift will move quickly out of the area by mid-morning and the higher rain rates with them. Generally a half inch to as much as an inch and quarter are favored across the area. Some isolated locations that experience the strongest storms could see higher amounts.
Scattered showers and isolated thunderstorms are possible through the rest of the day and into Wednesday as the main upper-level low slowly pivots over Kansas before exiting the area Wednesday night. Thereafter, an upper- level ridge builds into the central Plains and we are favored to remain dry and mild through the weekend.
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.AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/... Issued at 605 AM CDT Tue Sep 23 2025
Generally MVFR at all TAF sites through the TAF period with rain showers. Thunderstorms moved through this morning and there are still some clusters across portions of eastern Kansas, but lightning is rapidly diminishing across the area. While a few lightning strikes can`t be ruled out, the prevailing weather type today will be rain showers. Precipitation will be most widespread this morning and become much more scattered this afternoon/evening.
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.TOP WATCHES/WARNINGS/ADVISORIES... None.
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DISCUSSION...Jones AVIATION...Jones
NWS TOP Office Area Forecast Discussion