Flash Flood Warning 10, NWS Topeka, KS

488 
WGUS73 KTOP 010422
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
1122 PM CDT Sun May 31 2026

KSC111-010730-
/O.CON.KTOP.FF.W.0010.000000T0000Z-260601T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon KS-
1122 PM CDT Sun May 31 2026

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 AM CDT MONDAY FOR 
SOUTHERN LYON COUNTY...

At 1121 PM CDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area. Between 3 and 4 inches of rain 
have fallen. Additional rainfall amounts of 1 to 3 inches are 
possible in the warned area. Flash flooding is ongoing or expected 
to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar.

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...
  Olpe.

This includes Kansas Turnpike between mile markers 117 and 121.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3826 9596 3817 9596 3817 9636 3835 9635
      3829 9595 3826 9595

FLASH FLOOD...RADAR INDICATED

$$

327 
WGUS73 KTOP 010724
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
224 AM CDT Mon Jun 1 2026

KSC111-010734-
/O.EXP.KTOP.FF.W.0010.000000T0000Z-260601T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Lyon KS-
224 AM CDT Mon Jun 1 2026

...FLASH FLOOD WARNING WILL EXPIRE AT 230 AM CDT EARLY THIS MORNING 
FOR SOUTHERN LYON COUNTY...

The flash flood warning has been replaced with a Flood Warning in 
effect until 11 AM CDT Monday.

&&

LAT...LON 3826 9596 3817 9596 3817 9636 3835 9635
      3829 9595 3826 9595

$$

Area Forecast Discussion
National Weather Service Topeka KS
618 PM CDT Sun May 31 2026

.KEY MESSAGES...

-A conditional threat for severe storms continues this evening,
 however, some uncertainty exists in whether storms develop.

-Best chances for storms early week will be in central KS. Chances
 increase eastward later in the week.

-Hot and humid to start the week, slightly cooler midweek.

&&

.DISCUSSION...
Issued at 148 PM CDT Sun May 31 2026

The main focus in the short-term is on the potential for severe
thunderstorms this evening. Looking at the synoptic pattern,
southwest flow persists aloft with an H5 trough axis across the
Northern Plains. Water vapor isn't showing much in the way of
shortwaves within the southwest flow as of midday. At the surface
low pressure is over northern Oklahoma and southern Kansas early
this afternoon. Instability has been building in the wake of this
morning's thunderstorm activity, although cloud cover is hampering
temps/dew points and associated instability a bit. The cloud cover
could continue to be a factor. However, most models agree on a quick
increase in instability into the evening with over 3000 J/kg of
MLCAPE in eastern KS by 21/22Z. The 18Z TOP RAOB still shows a cap
with 14C at 750mb. RAP forecast soundings show a similar cap, but
erode it by around 01/02Z. Some CAMs show storm initiation in our
southeastern counties around that same timeframe. Have kept POPs
only around 30 percent given uncertainty that remains on a forcing
mechanism and whether the cap can be overcome. If storms do develop,
there should be enough instability and deep layer shear to support
supercells with a damaging wind and hail risk. Backed sfc and low
level winds would also aid in a tornado risk with both RAP and HRRR
forecast soundings showing over 100 m2/s2 of 0-1km SRH and over 200
m2/s2 of 0-3km SRH.

Monday looks hot and humid with highs reaching the upper 80s and low
90s. Most of the day should be dry but chances for storms will begin
increasing again Monday night and early Tuesday, mainly in central
KS where models show impacts from a shortwave H5 trough. A mid-level
ridge will build over the area early in the week and a sfc ridge
will move in from the northeast midweek. That set up should keep the
main axis of storms in central KS until the upper ridge advances
eastward as an upper trough moves across the far northern CONUS.
Shortwaves aloft can be tough to predict several days in advance,
but in general, POPs will increase eastward late in the week as that
ridge pushes east. The 12Z run of long range models continue to show
a storm system moving over KS next weekend, which would keep rain
chances around. Temperature-wise, a slight cool down is expected
through midweek due to the sfc ridge nudging in from the east.

&&

.AVIATION /00Z TAFS THROUGH 00Z MONDAY/...
Issued at 618 PM CDT Sun May 31 2026

Main short-term aviation concern will be thunderstorm development
across east-central KS this evening that may impact KTOP and KFOE.
Kept mention at PROB30 as coverage in storms will remain isolated to
scattered in nature. Following storms this evening, model guidance
continues to be confident in fog development as clear skies build in
across the TAF locations. Ensemble guidance depicts areas further
west, such as KMHK, will see the best chances for visibilities under
1SM (60%+ chances). Areas further east may dip into MVFR and high-
end IFR status, but confidence in dense fog this far east at KTOP
and KFOE is low at this time. Fog should clear off a few hours after
sunrise Monday morning with mostly clear skies and light winds the
remainder of the TAF.

&&

.TOP WATCHES/WARNINGS/ADVISORIES...
None.

&&

DISCUSSION...Teefey
AVIATION...Griesemer

Hazardous Weather Outlook
National Weather Service Topeka KS
158 PM CDT Sun May 31 2026

KSZ008>012-020>024-026-034>040-054>056-058-059-011900-
Republic-Washington-Marshall-Nemaha-Brown-Cloud-Clay-Riley-
Pottawatomie-Jackson-Jefferson-Ottawa-Dickinson-Geary-Morris-
Wabaunsee-Shawnee-Douglas-Lyon-Osage-Franklin-Coffey-Anderson-
158 PM CDT Sun May 31 2026

This Hazardous Weather Outlook is for central Kansas, east central
Kansas, north central Kansas and northeast Kansas.

.DAY ONE...This afternoon and tonight.

A few thunderstorms may develop in eastern Kansas this evening. Any
storm that develops could produce damaging wind, and large hail. A
tornado could also occur.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

There is a slight chance for a few additional storms Monday
evening and night. These storms could produce some gusty winds or
small hail, primarily in central Kansas.

&&

More detailed information can be found at:
www.weather.gov/media/top/DssPacket.pdf

Preliminary Local Storm Report
National Weather Service Topeka KS
905 PM CDT Sun May 31 2026

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

0904 PM     Hail             3 SW Olpe               38.23N 96.21W
05/31/2026  E1.75 Inch       Lyon               KS   Emergency Mngr

&&