Alert archive / Kansas / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Kansas City, MO

May 27, 2021Johnson County, Leavenworth County, Wyandotte County, Kansas; Clay County, Jackson County, Platte County, Missouri

NWS Kansas City, MO issued this flash flood warning at May 27, 2021, 5:55 PM CDT for Johnson County, Leavenworth County, Wyandotte County, Kansas; Clay County, Jackson County, Platte County, Missouri. It was in force for 3 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 27, 2021, 5:55 PM CDT (22:55 UTC)
Expired
May 27, 2021, 9:00 PM CDT
In force
3 hr
Issued by
NWS Kansas City, MO
Area
Storm-based polygon
Flood severity
None

Counties Johnson County, KS, Leavenworth County, KS, Wyandotte County, KS, Clay County, MO, Jackson County, MO, Platte County, MO

The radar

The Pleasant Hill radar (KEAX), 68 km from the middle of the area, began a volume at 22:58 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
May 27, 6:21 PM CDTFLASH FLOOD5 Wnw Bonner Springs, KS8 TO 12 INCHES OF WATER OVER ROADWAY SOUTH OF THE 166TH ST AND METRO AVE INTERSECTION.
May 27, 6:55 PM CDTFLASH FLOOD3 N De Soto, KS12 INCHES OF WATER OVER ROADWAYS, 6 CARS CURRENTLY STALLED OUT IN WATER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 10.9 hours before the alert went out and 55 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2021-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2021-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -3 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
3 J/kg
Mixed-layer CIN
-459 J/kg
Mixed-layer LCL
1511 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
-3 m²/s²
0-3 km storm-relative helicity
343 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

403 
WGUS53 KEAX 272255
FFWEAX
KSC091-103-209-MOC047-095-165-280200-
/O.NEW.KEAX.FF.W.0007.210527T2255Z-210528T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Kansas City/Pleasant Hill MO
555 PM CDT Thu May 27 2021

The National Weather Service in Pleasant Hill MO has issued a

* Flash Flood Warning for...
  Northwestern Johnson KS County in east central Kansas...
  Southern Leavenworth County in northeastern Kansas...
  Wyandotte County in northeastern Kansas...
  Southwestern Clay County in west central Missouri...
  Northwestern Jackson County in west central Missouri...
  Southeastern Platte County in west central Missouri...

* Until 900 PM CDT.

* At 555 PM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  1.5 and 3 inches of rain have fallen. Additional rainfall amounts 
  of 0.5 to 1 inch are possible in the warned area. Flash flooding 
  is already occurring.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Kansas City, Overland Park, Olathe, Independence, Shawnee, Lenexa, 
  Liberty, Gladstone, Merriam, Mission, Smithville, Bonner Springs, 
  De Soto, Parkville, Tonganoxie, Basehor, Edwardsville, North 
  Kansas City, Sugar Creek and Riverside.

This includes the following highways...
	Kansas Turnpike between mile markers 206 and 226.
	Interstate 435 between mile markers 6 and 24...and
	between mile markers 38 and 57.
	Interstate 35 in Kansas between mile markers 230 and 235.
	Interstate 635 between mile markers 0 and 12.
	Interstate 29 between mile markers 0 and 11.
	Interstate 35 in Missouri between mile markers 0 and 16.
	Interstate 70 in Kansas between mile markers 410 and 423.
	Interstate 70 in Missouri between mile markers 0 and 4.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3908 9519 3935 9453 3917 9440 3905 9460
      3898 9487 3895 9506 3898 9506 3899 9507
      3898 9508 3898 9509 3896 9508 3895 9509
      3896 9510 3897 9511 3897 9513 3898 9516
      3897 9517 3896 9519

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

PP
1 follow-up statement
679 
WGUS73 KEAX 280158
FFSEAX

Flash Flood Statement
National Weather Service Kansas City/Pleasant Hill MO
858 PM CDT Thu May 27 2021

KSC091-103-209-MOC047-095-165-280208-
/O.EXP.KEAX.FF.W.0007.000000T0000Z-210528T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Johnson KS KS-Leavenworth KS-Wyandotte KS-Clay MO-Jackson MO-
Platte MO-
858 PM CDT Thu May 27 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 9 PM CDT THIS EVENING FOR 
NORTHWESTERN JOHNSON KS, SOUTHERN LEAVENWORTH, WYANDOTTE, 
SOUTHWESTERN CLAY, NORTHWESTERN JACKSON AND SOUTHEASTERN PLATTE 
COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3908 9519 3935 9453 3917 9440 3905 9460
      3898 9487 3895 9506 3898 9506 3899 9507
      3898 9508 3898 9509 3896 9508 3895 9509
      3896 9510 3897 9511 3897 9513 3898 9516
      3897 9517 3896 9519

$$

PP

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 27, 1:20 AM CDTRiver Flood WarningEAXAtchison, Leavenworth7 hr
May 27, 2:50 AM CDTSpecial Weather StatementEAXLeavenworth, Wyandotte40 min
May 27, 6:19 AM CDTSpecial Weather StatementEAXJohnson, Miami41 min
May 27, 6:28 AM CDTSpecial Weather StatementEAXLeavenworth, Wyandotte32 min
May 27, 7:51 AM CDTAreal Flood AdvisoryEAXMiami71 min
May 27, 9:02 AM CDTFlash Flood WarningEAXMiami3 hr
May 27, 9:49 AM CDTRiver Flood WarningEAXMiami3 days
May 27, 9:57 AM CDTRiver Flood WarningEAXLinn4 days
May 27, 10:50 AM CDTFlash Flood WatchEAXLinn, Miami8 hr
May 27, 11:23 AM CDTRiver Flood WarningEAXLinn4 days
May 27, 11:46 AM CDTAreal Flood WarningEAXLinn, Miami9 hr
May 27, 4:08 PM CDTSpecial Weather StatementEAXWyandotte37 min
May 27, 4:51 PM CDTAreal Flood AdvisoryEAXJohnson, Leavenworth, Wyandotte3 hr
May 27, 5:14 PM CDTSevere Thunderstorm WarningEAXJohnson, Leavenworth, Wyandotte31 min
May 27, 5:40 PM CDTSevere Thunderstorm WarningEAXLeavenworth, Wyandotte35 min
May 27, 1:20 AM CDTRiver Flood WarningEAXCarroll32 hr
May 27, 1:20 AM CDTRiver Flood WarningEAXCooper, Saline55 hr
May 27, 1:20 AM CDTRiver Flood WarningEAXCass, Henry, Johnson4 days
May 27, 1:20 AM CDTRiver Flood WarningEAXJohnson, Pettis39 hr
May 27, 3:15 AM CDTSpecial Weather StatementEAXAndrew45 min
May 27, 3:51 AM CDTSpecial Weather StatementEAXClay, Clinton39 min
May 27, 4:05 AM CDTSevere Thunderstorm WarningEAXCaldwell, Clinton, Daviess, DeKalb40 min
May 27, 4:26 AM CDTSpecial Weather StatementEAXCaldwell, Carroll49 min
May 27, 4:50 AM CDTSpecial Weather StatementEAXHenry40 min
May 27, 5:27 AM CDTSpecial Weather StatementEAXChariton, Linn, Macon, Sullivan48 min
May 27, 5:37 AM CDTSpecial Weather StatementEAXPettis38 min
May 27, 6:22 AM CDTRiver Flood WarningEAXClay, Ray27 hr
May 27, 6:51 AM CDTSpecial Weather StatementEAXJackson39 min
May 27, 8:31 AM CDTAreal Flood AdvisoryEAXHenry, Johnson, Pettis31 min
May 27, 9:02 AM CDTFlash Flood WarningEAXHenry, Johnson, Pettis3 hr
May 27, 9:35 AM CDTRiver Flood WarningEAXBates, Cass, Henry56 hr
May 27, 11:46 AM CDTAreal Flood WarningEAXHenry, Johnson, Pettis9 hr
May 27, 12:25 PM CDTRiver Flood WarningEAXHoward8 hr
May 27, 12:25 PM CDTRiver Flood WarningEAXCooper19 hr
May 27, 4:50 PM CDTSpecial Weather StatementEAXClay40 min
May 27, 5:05 PM CDTSevere Thunderstorm WarningEAXClay, Ray25 min
May 27, 5:58 PM CDTFlash Flood WarningEAXClay, Ray3 hr
May 27, 6:11 PM CDTSpecial Weather StatementEAXClay34 min

Nearby

Flash Flood Warnings in Kansas, 2021Flash Flood Warnings in Missouri, 2021Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.