Flash Flood Warning 12, NWS Kansas City, MO

Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
630 AM CDT Mon Apr 27 2026

.KEY MESSAGES...

- Severe thunderstorms will persist through the morning across
eastern KS and western MO, with some impact on later storm
development further west.

- Strong/severe storms anticipated to develop further east  during
the afternoon and into the evening, with all severe  hazards
possible.

- Mostly quiet forecast period ahead, with some isolated chances (20-
40%) for showers/storms through the period.

&&

.SHORT TERM /THROUGH TONIGHT/...
Issued at 345 AM CDT Mon Apr 27 2026

Continued convective activity is expected through the overnight
hours into the morning today. From a mesoanalysis perspective,
elevated storm modes have been able to persist through the night
with adequate MLCAPE values (around 1000-1500 J/kg) and ample
environmental shear (50-60 kts) along the left exit region of the
LLJ. An elevated dry layer persists to the southeast of the main
line, with upscale growth occurring more towards the northeast
through time. These storms have a history of producing large hail
and damaging winds further west, which will continue to be the
concern through the overnight period. Current CAM guidance shows
this cluster of storms congealing into a line that will push towards
the southeast during the early morning hours, with consistency
between subsequent iterations of the HRRR through the night and
reflected by the 6z run of the RAP. However, continued mesoanalysis
will be the greater influence on subsequent updates to the forecast
as the event progresses. With this line of storms, there is concern
for flash flooding along a line through the KC Metro. Present PWAT
values over our immediate forecast area reside around 1-1.5 inches,
but our threshold for meeting flash flood guidance for hourly
precipitation is around 1.5 inches, which will easily be
met/exceeded in convective storms. Thus, will be continuing to
monitor the potential for flooding/flash flooding tonight and into
this morning, especially for areas where training precipitation
could occur over the next few hours.

Regarding the remainder of the day today, any lingering shower/storm
activity should gradually exit the area through the afternoon as the
cold front begins to push in with a deepening surface cyclone
lifting from the OK Panhandle towards the northeast. There is some
uncertainty on how current weather will impact storms developing
further west, as current storms would aid in further stabilizing the
atmosphere. Greater confidence in severe activity exists further
towards the east around Kirksville/Macon area, with greater
instability generation during the day and more significant synoptic
forcing along an eroding capping inversion. With any storms that
initiate along the cold frontal boundary, the threat for all severe
hazards exists, with moderate mid- level lapse rates on the order of
7.5-8 degC/km and effective shear around 50-60 kts supporting
organized storm development. Some CAMs try to force activity behind
the passing cold front, but the threat of these storms scaling
upward into severe storms remains lower, as the cold front will
effectively wipe out any favorable storm environment as it passes
through.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
Issued at 345 AM CDT Mon Apr 27 2026

The upper level trough north of the Great Lakes will generate
shortwaves that will invigorate some chance of precipitation through
the remainder of this week, with the chance (30-50%) for
showers/storms south of the US-50 corridor Tuesday
afternoon/evening. Otherwise, weather will remain generally quiet as
we reside under northwest flow with the upper level trough digging
towards the Great Lakes through the period. There is some chance for
additional precipitation chances (10-30%) late Thursday/early
Friday, but general model deviance at this point does not place high
confidence in this outcome. Highs will remain much cooler than in
previous days, with highs forecasted in the low-mid 60s through much
of the forecast period before warming back up near the end of the
forecast period.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 624 AM CDT Mon Apr 27 2026

Very messy TAF period, with lots of variables to consider. Current
storms progressing through terminals, with storms clear of
northern terminals at this time. Weather is expected to clear
from terminals at around 13z, with lingering showers/storms
possible at southern terminals through 15z with development on
the back edge of current storm line. Around early/mid afternoon,
expecting gusts to pick up as winds shift from southeasterly
towards the north/northwest through the period. Also expecting
ceilings to gradually lift and clear through the afternoon.
Confidence is not high enough in a weather mention for this
afternoon, so have elected to leave it out of this TAF issuance
to evaluate forecast confidence at the next issuance.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...Flood Watch through this evening for MOZ001>008-011>017-
     020>025-028>033-037>040-043>046-053-054.
KS...Flood Watch through this evening for KSZ025-057-060-102>105.

&&

SHORT TERM...SPG
LONG TERM...SPG
AVIATION...SPG

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
0510 AM CDT Mon Apr 27 2026

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-281010-
Atchison KS-Miami-Linn KS-Doniphan-Leavenworth-Wyandotte-Johnson KS-
Atchison MO-Nodaway-Worth-Gentry-Harrison-Mercer-Putnam-Schuyler-
Holt-Andrew-De Kalb-Daviess-Grundy-Sullivan-Adair-Buchanan-Clinton-
Caldwell-Livingston-Linn MO-Macon-Platte-Clay-Ray-Carroll-Chariton-
Randolph-Jackson-Lafayette-Saline-Howard-Cass-Johnson MO-Pettis-
Cooper-Bates-Henry-
0510 AM CDT Mon Apr 27 2026

This hazardous weather outlook is for northwest...north central and
west central Missouri...as well as extreme eastern Kansas.

.DAY ONE...Through tonight.

Please go to https://weather.gov/media/eax/DssPacket.pdf for more information on
potential weather hazards.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Please go to https://weather.gov/media/eax/DssPacket.pdf for more information on
potential weather hazards.

.KEY MESSAGES...

- Severe thunderstorms will persist through the morning across
eastern KS and western MO, with some impact on later storm
development further west.

- Strong/severe storms anticipated to develop further east  during
the afternoon and into the evening, with all severe  hazards
possible.

- Mostly quiet forecast period ahead, with some isolated chances (20-
40%) for showers/storms through the period.

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
632 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0615 AM     Flash Flood      Riverside               39.18N 94.61W
04/27/2026                   Platte             MO   Law Enforcement

            Multiple roads closed from flash flooding in
            Riverside.

&&

CMS

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
639 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0635 AM     Flash Flood      1 N Maywood             39.14N 94.80W
04/27/2026                   Wyandotte          KS   Local Official

            Water rushing over 96th and Leavenworth.

&&

CMS

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
650 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0546 AM     Hail             4 SW Shawnee            38.97N 94.86W
04/27/2026  M1.75 Inch       Johnson            KS   Trained Spotter

            Spotter called in, reported hail between 3/4
            and 1 3/4 between 5:42-5:46am, time
            confirmed from radar.

&&

spg

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
652 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 AM     Flood            4 SSW Raytown           38.95N 94.50W
04/27/2026                   Jackson            MO   Trained Spotter

            Reported flooding occurring in this area
            since around 5:16am, time taken from time of
            call.

&&

spg

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
658 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0605 AM     Hail             1 NW Stanley            38.87N 94.68W
04/27/2026  M1.00 Inch       Johnson            KS   Public

&&

CMS

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
703 AM CDT Mon Apr 27 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0650 AM     Tstm Wnd Dmg     7 NE Prairie Hill       39.60N 92.66W
04/27/2026                   Randolph           MO   Broadcast Media

            Multiple 6-10 inch limbs down and dime size
            hail.

&&