160 FXUS63 KEAX 112335 AFDEAXArea Forecast Discussion National Weather Service Kansas City/Pleasant Hill MO 635 PM CDT Thu Sep 11 2025
.KEY MESSAGES...
* Late season heat wave expected late week with high temperatures in the 90s F and heat indicies approaching 95-100 F in some locations.
* More unsettled pattern returns to the region as early as Sunday night with mainly overnight chances of rain through Wednesday morning. Temperatures remain above normal.
&&
.DISCUSSION... Issued at 131 PM CDT Thu Sep 11 2025
A relatively slowly evolving pattern is expected the next several days with an omega block across the lower 48 leading to upper level ridging and a warming pattern through at least the first half of the weekend. Mild temperatures centered across the western high plains today will shift east tomorrow into Saturday. With the warming temperatures and increasing pressure gradient, expect lows to be around 5 degrees warmer tonight than last night. With little change in moisture, dew point depressions should be wider limiting fog potential.
15-20 knots aloft is expected to mix down from 925/850hpa towards the surface on Friday leading to marginally gusty conditions. With the flow originating in west Texas versus the gulf expect moisture values to creep up only slightly keeping heat index values just a degree or two above the actual temperature. As the ridge near the surface over the Tennessee Valley weakens and shifts slightly to the southeast, expect flow to draw a little additional moisture into the region as temperatures continue to warm. This will result in widespread readings in the 90s F Saturday afternoon and heat indicies approaching the 95-100 F range Saturday afternoon. Best chance for this occurring will be across central Missouri which is also supported by the LREF ensemble.
Upper ridge shifts noticeably east late Saturday into Sunday as east coast trough breaks down and west coast trough shifts east. Upper ridge across central US pushes the approaching upper low north, but northern Missouri could get clipped by chances of rain as early as Sunday night. Mainly nocturnal chances of rain continue into early next week as upper ridge continues to break down and spokes of energy rotate into the region emanating from the upper trough across the Northern Plains.
&&
.AVIATION /00Z TAFS THROUGH 00Z SATURDAY/... Issued at 632 PM CDT Thu Sep 11 2025
VFR conditions are expected for the duration of the forecast period. High clouds will continue to move through the region overnight. Winds will slow becoming SE through the overnight before shifting more southerly and accelerating after sunrise with afternoon gusts around 20-25 knots.
&&
.EAX WATCHES/WARNINGS/ADVISORIES... MO...None. KS...None.
&&
$$
DISCUSSION...BT AVIATION...Pesel
NWS EAX Office Area Forecast Discussion