447
FXUS63 KEAX 270721
AFDEAX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE KANSAS CITY/PLEASANT HILL MO
221 AM CDT SUN SEP 27 2026
KEY MESSAGES
- ISOLATED TO SCATTERED SHOWERS AGAIN TODAY, MAINLY FOR AREAS SOUTH/EAST
OF I-35. A FEW THUNDERSTORMS ARE POSSIBLE AS WELL, BUT SEVERE
WEATHER IS NOT EXPECTED.
- THE POTENTIAL FOR HEAVY RAIN AND FLOODING FOR THE MIDDLE OF
THE WEEK IS INCREASING. MULTIPLE ROUNDS OF HEAVY RAIN ARE
EXPECTED IN THE REGION FROM TUESDAY NIGHT THROUGH THURSDAY.
DISCUSSION
ISSUED AT 221 AM CDT SUN SEP 27 2026
WATER VAPOR IMAGERY SHOWS A SHORTWAVE TROUGH OVER NORTHERN MISSOURI,
SLOWLY MOVING EASTWARD. IT'S PROGRESS IS BEING HAMPERED BY THE THE
DEEP UPPER LOW/ NOR'EASTER OVER THE EASTERN US THAT IS STUCK WITHIN
A BROAD UPPER RIDGE. THIS IS CLOSE TO A REX BLOCK SETUP BUT NOT
QUITE THERE JUST YET AND IT SEEMS UNLIKELY TO EVOLVE INTO A TRUE
BLOCKING PATTERN. REGARDLESS, IT IS STILL SLOWING THE PROGRESSION OF
WAVES THROUGH THE MIDDLE OF THE COUNTRY. THERE IS ANOTHER WAVE,
POTENTIALLY A SUBTLE INTERNAL PV ANOMALY, LEADING TO SHOWERS AND
STORMS IN SOUTHEASTERN KANSAS AS OF 07Z. WITH THE NEAR BLOCKING
PATTERN TO THE EAST, THIS WAVE WILL MEANDER OVER/THROUGH THE
SOUTHERN HALF OF THE FORECAST AREA TODAY, LEADING TO CONTINUED
ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS, MAINLY SOUTH/ EAST
OF I-35. WHILE WE'LL SEE GREATER INSTABILITY, ESPECIALLY ACROSS
EASTERN KANSAS AND FAR WESTERN MISSOURI, SHEAR REMAINS WEAK SO
SEVERE WEATHER IS NOT ANTICIPATED. PRECIPITATION CHANCES SHOULD
FINALLY START TO WIND DOWN BY 03Z TO 06Z MONDAY, LEADING TO DRY
CONDITIONS FOR MONDAY INTO TUESDAY.
FOCUS THEN TURNS TO THE POTENTIAL FOR WIDESPREAD HEAVY RAINFALL AND
FLOODING FOR THE MIDDLE TO LATER PORTIONS OF THE WORK WEEK,
TUESDAY NIGHT THROUGH MAINLY THURSDAY. FROM A SYNOPTIC
PERSPECTIVE, THIS PATTERN FLASHES HEAVY RAINFALL. IN THE UPPER-
LEVELS, A POTENT SHORTWAVE TROUGH WILL BE MOVING INTO THE
SOUTHWEST. THIS WILL HELP DRAW COPIOUS AMOUNTS OF MID AND UPPER-
LEVEL MOISTURE FROM THE PACIFIC INTO THE CENTRAL US. THIS
MOISTURE IS WILL BE THE REMNANTS OF WHAT IS CURRENTLY HURRICANE
POLO. IN THE LOWER-LEVELS, A BROAD HIGH PRESSURE AREA OVER THE
EASTERN US WILL LEAD TO A STRONG MOISTURE TRANSPORT FROM THE
GULF NORTHWARD INTO EASTERN KANSAS AND WESTERN MISSOURI. THIS
COMBINATION OF RICH LOWER-TO-MID-LEVEL MOISTURE AND UPPER-LEVEL
MOISTURE WILL LEAD TO VERY ANOMALOUS PRECIPITABLE WATER VALUES.
IN FACT, THESE VALUES ARE 3+ STANDARD DEVIATIONS ABOVE NORMAL
FOR THIS TIME OF YEAR, ABOVE THE 99.5 PERCENTILE FOR A LARGE
PORTION OF THE AREA, AND AT THE MAX VALUES ON THE NAEFS
PERCENTILES AND GEFS M-CLIMATE. ENSEMBLE GUIDANCE SHOWS ROUGHLY
A 10-20% CHANCE FOR AT LEAST FOUR INCHES OF RAIN FOR THE RUN
ENDING AT 7PM FRIDAY. THIS JUMPS TO 20-30%+ FOR TOTAL RAIN OF AT
LEAST 3 INCHES THROUGH THE SAME TIME FRAME. WITH ALL THAT SAID,
THERE REMAINS A FAIR AMOUNT OF UNCERTAINTY ON WHERE THE
HEAVIEST RAINS WILL ACTUALLY SETUP. THAT WILL LARGELY DEPEND ON
WHERE THE STRONGEST FORCING SETS UP AS THE SHORTWAVE EJECTS INTO
THE PLAINS WEDNESDAY INTO THURSDAY AS THE SYSTEM TAKES ON
DISTINCTIVE MID-LATTITUDE CYCLONE CHARACTERISTICS, WITH A
NOTABLE DEFORMATION AREA, A WARM FRONTAL REGION EXTENDING
EASTWARD, AND COLD FRONT EXTENDING SOUTHWARD. EACH OF THESE
AREAS WILL PROVIDE A FOCUS FOR HEAVY RAINFALL AND PLACEMENT OF
THESE FEATURES WILL BE KEY TO DEFINING THE AREAS WITH THE
GREATEST FLOODING POTENTIAL.
AVIATION /00Z TAFS THROUGH 00Z MONDAY/
ISSUED AT 611 PM CDT SAT SEP 26 2026
LIGHT RAIN SHOWERS ARE WORKING EAST ACROSS THE REGION LEADING TO
DRYING CONDITIONS FROM WEST TO EAST; HOWEVER, ADDITIONAL SHOWER
ACTIVITY IS EXPECTED TO DEVELOP EARLY SUNDAY MORNING. MVFR STRATUS
IS EXPECTED TO DEVELOP AFTER 14Z SUNDAY MORNING ALONG AND NORTH
OF I-70 AND LOOKS TO REMAIN FAIRLY CONSISTENT THROUGHOUT THE
DAY.
EAX WATCHES/WARNINGS/ADVISORIES
MO...NONE.
KS...NONE.
DISCUSSION...CDB
AVIATION...BT
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