Flash Flood Warning 14, NWS Kansas City, MO

225 
WGUS53 KEAX 170043
FFWEAX
MOC079-081-129-170630-
/O.EXT.KEAX.FF.W.0014.000000T0000Z-260517T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Kansas City/Pleasant Hill MO
743 PM CDT Sat May 16 2026

The National Weather Service in Pleasant Hill has extended the

* Flash Flood Warning for...
  Grundy County in north central Missouri...
  Southeastern Harrison County in north central Missouri...
  Southwestern Mercer County in north central Missouri...

* Until 130 AM CDT.

* At 743 PM CDT, Emergency management Water was flowing over several
  locations along Highway 146 west of Trenton. . Between 3 and 6
  inches of rain have fallen. Additional rainfall amounts of 0.5 to 2
  inches are possible in the warned area. Flash flooding is already
  occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Emergency management reported.

  IMPACT...Flash flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other poor
           drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Trenton, Bethany, Gilman City, Spickard, Galt, Laredo, Tindall and
  Brimson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4014 9416 4034 9405 4033 9400 4025 9339
      3997 9339 3997 9346 4004 9376 4013 9376

FLASH FLOOD...OBSERVED

$$

CDB

191 
WGUS73 KEAX 170107
FFSEAX

Flash Flood Statement
National Weather Service Kansas City/Pleasant Hill MO
807 PM CDT Sat May 16 2026

MOC079-081-129-170630-
/O.CON.KEAX.FF.W.0014.000000T0000Z-260517T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grundy MO-Harrison MO-Mercer MO-
807 PM CDT Sat May 16 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 130 AM CDT SUNDAY FOR
GRUNDY, SOUTHEASTERN HARRISON AND SOUTHWESTERN MERCER COUNTIES...

At 807 PM CDT, Emergency management reported flash flooding is
occurring in the city of Trenton. Water is over multiple roads
including Normal Street west of the school complex. Additionally,
water was flowing over several locations along Highway 146 west of
Trenton. . Between 3 and 6 inches of rain have fallen. Additional
rainfall amounts of 0.5 to 2 inches are possible in the warned area.
Flash flooding is already occurring.

HAZARD...Life threatening flash flooding. Thunderstorms producing
         flash flooding.

SOURCE...Emergency management reported.

IMPACT...Life threatening flash flooding of creeks and streams, urban
         areas, highways, streets and underpasses.

Some locations that will experience flash flooding include...
  Trenton, Bethany, Gilman City, Spickard, Galt, Laredo, Tindall and
  Brimson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Move to higher ground now. Act quickly to protect your life.

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

&&

LAT...LON 4014 9416 4034 9405 4033 9400 4025 9339
      3997 9339 3997 9346 4004 9376 4013 9376

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

CDB

769 
WGUS73 KEAX 170614
FFSEAX

Flash Flood Statement
National Weather Service Kansas City/Pleasant Hill MO
114 AM CDT Sun May 17 2026

MOC079-081-129-170624-
/O.CAN.KEAX.FF.W.0014.000000T0000Z-260517T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grundy MO-Harrison MO-Mercer MO-
114 AM CDT Sun May 17 2026

...FLASH FLOOD WARNING IS CANCELLED FOR GRUNDY, SOUTHEASTERN HARRISON
AND SOUTHWESTERN MERCER COUNTIES...

The flash flood warning has been replaced by an areal flood warning,
which is in effect until 1200 PM CDT.

&&

LAT...LON 4014 9416 4034 9405 4033 9400 4025 9339
      3997 9339 3997 9346 4004 9376 4013 9376

$$

CMS

Area Forecast Discussion
National Weather Service Kansas City/Pleasant Hill MO
344 PM CDT Sat May 16 2026

.KEY MESSAGES...

* Strong to severe storms possible (50-70%) late this afternoon and
  evening, primarily across northern Missouri. All hazards are
  possible, but the greatest threats are damaging winds and heavy
  rainfall.

* Warm and windy conditions Sunday before another chance of storms
  later in the evening/overnight, mainly across northern Missouri
  again. The primary hazard would be hail.

* Greatest chance for severe weather arrives Monday evening into
  the overnight hours. All severe hazards will be possible.

&&

.DISCUSSION...
Issued at 342 PM CDT Sat May 16 2026

Earlier this morning, scattered showers and storms driven by the low-
level jet spread across the southern half of the CWA. A residual
outflow boundary from overnight convection lifting north caused
additional storms to form near the US-36 corridor. These storms
persisted for a couple of hours before decaying in tandem with the
low-level jet. CAMs were unable to latch onto the morning
convection, thus limiting trust in guidance for the remainder of the
immediate forecast period and leading to several questions about how
the evening will unfold.

In the wake of morning precipitation and storms, clear sky
conditions  largely took hold along and west of US-63. This, along
with southerly surface flow, led to destabilization across the CWA.
Mesoanalysis indicates around 1000-1500 J/kg of SBCAPE was ushered
into the region between 15Z and 18Z. As of 20Z, SBCAPE across
Missouri has increased to 3000-4000 J/kg. ACARS soundings have shown
this trend, most recently with SBCAPE ~3000 J/kg and falling CIN.
With increased instability, sporadic cumulus development was noted
across the region early this afternoon. The latest analysis of
surface observations indicate that a stalled boundary continues to
roughly bisect Iowa in a northwest/southeast manner. This boundary
will be the primary lifting mechanism as we head into the late
afternoon and early evening. Importantly, there has been a southward
trend in the boundary's trajectory this evening, ultimately
increasing the likelihood of convection for the northern portions of
Missouri as well as northeast Kansas. Satellite imagery remains
indicative of some sort of mesoscale boundary within the US-36
corridor that could allow for convection to light up as a weak
shortwave trough propagates eastward and ahead of the larger,
synoptic scale boundary currently sitting in Iowa. As such, isolated
discrete storms could form as early as late this afternoon. With
CAPE >1000 J/kg in the hail growth zone, hail is a reasonable
expectation for storms that are able to develop in the late
afternoon hours. LCLs are anticipated to sit roughly around 1500ft,
and 19Z mesoanalysis suggests the presence of 100-150 m2/s2 0-1km
SRH east of I-35 with >150 m2/s2 0-3km SRH surrounding the US-36
corridor in Missouri. The tornado threat is expected to be largely
confined to the late afternoon/early evening with any supercellular
structures that are able to develop. As the northern boundary sags
south later in the evening, rapid upscale growth is anticipated,
after which point the primary threat would become damaging winds and
excessive rainfall, but a tornado cannot be entirely ruled out due
to potential boundary interactions and cell mergers. With several
models suggesting PWATs > 1.8", confidence in heavy rainfall between
the US-36 corridor and the Missouri-Iowa border is high, leading to
WPC upgrading to a slight risk of excessive rainfall through 12Z
tomorrow.

Storms are expected to retreat northward with the synoptic boundary
after midnight, though the southward portion of a QLCS coming out of
western Kansas and Nebraska could lead to brief periods of rain and
thunder in our far northern Missouri counties through sunrise.
Southerly flow will prevail on Sunday, allowing for another day of
temperatures in the mid/upper 80s. Breezy conditions will also be
widespread with sustained winds up to 15-20 MPH and gusts up to 35-
40 MPH. Much of the area is outlooked in a marginal risk for strong
to severe storms tomorrow evening, though assessment of forecast
soundings suggests the cap will be rather difficult to overcome.
Upper-level support also looks considerably better further north and
west of the CWA. Some broad and weak QG frontogenic forcing
overnight could produce or sustain some elevated showers and storms
from other portions of the Plains, but CAMs don't seem particularly
eager on anything severe tomorrow night.

Looking ahead to Monday, an upper/mid-level trough axis is progged
to sit overhead of the Four Corners region. Throughout the course of
the day, a mid-level jet is expected to intensify, primarily into
Kansas, Nebraska, and Iowa where southwesterly flow around 80 knots
is predicted to be present. Closer to home, only about half the
magnitude of the mid-level jet is realized. A surface low pressure
center near the IA/NE/MN border with an attendant cold front will
continue to move eastward, with the cold front pushing into Kansas
and Missouri sometime Monday evening. Guidance suggests that a high
to extremely unstable airmass will spread across much of the Central
Plains. Deep layer shear is anticipated to strengthen to 40-45 kts
ahead of the cold front. High CAPE in the HGZ, DCAPE, SRH, PWATs and
low LCLs are all indicative of a robust convective environment.
Questions remain regarding the timing of the front and whether we
will see discrete convection initiate in the open warm sector.
However, confidence is high in a line of thunderstorms along the
front sometime Monday evening and/or overnight into early Tuesday
morning.

&&

.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...
Issued at 1214 PM CDT Sat May 16 2026

Breezy southerly/southeasterly winds are expected at all four
terminals for much of the TAF period. Saturday, sustained winds
between 10-15 kts with occasional gusts up to 25 kts will
persist through sunset. After sunset, winds should lighten with
limited gust potential. After sunrise Sunday, however, winds
will again pick up out of the south, this time sustained between
15-20 kts with gusts around 30 kts. Scattered thunderstorms are
possible between 22Z Saturday and 09Z Sunday across northern
Missouri. PROB30 for -TSRA has been included from 00Z through
03Z Sunday for KSTJ given the uncertainty surrounding the
southern extent of storm development/coverage.

&&

.EAX WATCHES/WARNINGS/ADVISORIES...
MO...None.
KS...None.

&&

DISCUSSION...Macko
AVIATION...Macko

Hazardous Weather Outlook
National Weather Service Kansas City/Pleasant Hill MO
0506 AM CDT Sat May 16 2026

KSZ025-057-060-102>105-MOZ001>008-011>017-020>025-028>033-037>040-
043>046-053-054-171006-
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-
0506 AM CDT Sat May 16 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...Sunday through Friday.

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

.KEY MESSAGES...

- Active weather pattern continues into early next week.

- Strong to severe storms will be possible tonight, primarily
  across northern Missouri.

- Marginal risk for strong to severe storms on Sunday
  evening/night.

- Best chance for severe weather comes Monday afternoon into
  late Monday night. All severe hazards will be possible.

  - Locally moderate to heavy rainfall will also be possible.

- Hot temperatures expected today through Monday.

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
502 PM CDT Sat May 16 2026

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

0458 PM     Hail             3 SSE Bethany           40.23N 94.01W
05/16/2026  E1.25 Inch       Harrison           MO   Trained Spotter

&&

AK

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
505 PM CDT Sat May 16 2026

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

0502 PM     Hail             4 E Trenton             40.08N 93.55W
05/16/2026  M1.00 Inch       Grundy             MO   Public

&&

SM

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
508 PM CDT Sat May 16 2026

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

0501 PM     Hail             4 ESE Bethany           40.26N 93.96W
05/16/2026  E1.50 Inch       Harrison           MO   Trained Spotter

&&

AK

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
516 PM CDT Sat May 16 2026

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

0511 PM     Hail             2 ESE Trenton           40.07N 93.58W
05/16/2026  E1.25 Inch       Grundy             MO   Emergency Mngr

&&

AK

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
517 PM CDT Sat May 16 2026

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

0514 PM     Hail             5 E Bethany             40.26N 93.93W
05/16/2026  E1.00 Inch       Harrison           MO   Trained Spotter

&&

AK

Preliminary Local Storm Report
National Weather Service Kansas City/Pleasant HIll MO
521 PM CDT Sat May 16 2026

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

0517 PM     Hail             2 ESE Trenton           40.06N 93.58W
05/16/2026  E2.75 Inch       Grundy             MO   Public

            Chaser reports baseball size hail south of
            Trenton along Hwy 65 via social media.

&&

AK