Alert archive / Kansas / Flash Flood Warnings in 2021

Flash Flood Warning 5, NWS Topeka, KS

May 19, 2021Anderson County, Coffey County, Kansas

NWS Topeka, KS issued this flash flood warning at May 19, 2021, 6:44 PM CDT for Anderson County, Coffey County, Kansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 19, 2021, 6:44 PM CDT (23:44 UTC)
Expired: May 19, 2021, 9:23 PM CDT
In force: 3 hr
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Flood severity: None

Counties Anderson County, KS, Coffey County, KS

The radar

The Topeka radar (KTWX), 100 km from the middle of the area, began a volume at 23:48 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 11.7 hours before the alert went out and 78 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 33 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 721 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

949 
WGUS53 KTOP 192344
FFWTOP
KSC003-031-200345-
/O.NEW.KTOP.FF.W.0005.210519T2344Z-210520T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Topeka KS
644 PM CDT Wed May 19 2021

The National Weather Service in Topeka has issued a

* Flash Flood Warning for...
  Anderson County in east central Kansas...
  Eastern Coffey County in east central Kansas...

* Until 1045 PM CDT.

* At 643 PM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is ongoing or expected to begin
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Garnett, Waverly, Colony, Westphalia, Kincaid, Lone Elm, Harris and
  Le Roy.

Additional rainfall amounts of one to two inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3843 9570 3843 9551 3839 9551 3839 9524
      3804 9514 3804 9567

FLASH FLOOD...RADAR INDICATED

$$

Baerg

1 follow-up statement

371 
WGUS73 KTOP 200223
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
923 PM CDT Wed May 19 2021

KSC003-031-200232-
/O.CAN.KTOP.FF.W.0005.000000T0000Z-210520T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Anderson-Coffey-
923 PM CDT Wed May 19 2021

...THE FLASH FLOOD WARNING FOR ANDERSON AND EASTERN COFFEY COUNTIES
IS CANCELLED...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Light to moderate rain will continue for the next couple of 
hours. Please continue to heed any remaining road closures.

LAT...LON 3843 9570 3843 9551 3839 9551 3839 9524
      3804 9514 3804 9567

$$

Baerg

The office that day

Everything else NWS Topeka, KS issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 19, 5:34 PM CDT	Areal Flood Advisory	TOP	Anderson	3 hr
May 19, 5:47 PM CDT	Areal Flood Advisory	TOP	Anderson, Franklin	3 hr
May 19, 5:55 PM CDT	Areal Flood Advisory	TOP	Douglas, Jefferson	3 hr

Nearby

Flash Flood Warnings in Kansas, 2021 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.