Alert archive / Kansas / Flash Flood Warnings in 2021

Flash Flood Warning 21, NWS Topeka, KS

July 15, 2021Clay County, Cloud County, Riley County, Kansas

NWS Topeka, KS issued this flash flood warning at Jul 15, 2021, 12:33 AM CDT for Clay County, Cloud County, Riley County, Kansas. It was in force for 3 hr. 1 report 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: Jul 15, 2021, 12:33 AM CDT (05:33 UTC)
Expired: Jul 15, 2021, 3:30 AM CDT
In force: 3 hr
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Flood severity: None

Counties Clay County, KS, Cloud County, KS, Riley County, KS

The radar

The Topeka radar (KTWX), 67 km from the middle of the area, began a volume at 05:32 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

Time	Report	Where	Remark
Jul 15, 3:20 AM CDT	FLASH FLOOD	Morganville, KS	WATER WAS REPORTED TO BE OVER MULTIPLE ROADS IN THE CITY OF MORGANVILLE.

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 00:00Z, 5.6 hours before the alert went out and 111 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: 476 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1856 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

859 
WGUS53 KTOP 150533
FFWTOP
KSC027-029-161-150830-
/O.NEW.KTOP.FF.W.0021.210715T0533Z-210715T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Topeka KS
1233 AM CDT Thu Jul 15 2021

The National Weather Service in Topeka has issued a

* Flash Flood Warning for...
  Northwestern Riley County in northeastern Kansas...
  Central Clay County in north central Kansas...
  Southeastern Cloud County in north central Kansas...

* Until 330 AM CDT.

* At 1232 AM CDT, Doppler radar and automated gauges indicated
  thunderstorms producing heavy rain across the warned area. Up to
  three inches of rain have already fallen. Flash flooding is ongoing
  or expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar and automated gauges.

  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...
  Clay Center, Riley, Miltonvale, Leonardville, Morganville,
  Randolph, Green, Aurora and Idana.

Additional rainfall amounts of one to three 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.

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

&&

LAT...LON 3951 9757 3950 9666 3949 9666 3945 9672
      3943 9673 3941 9672 3940 9673 3937 9668
      3936 9669 3933 9667 3932 9665 3932 9664
      3930 9663 3929 9664 3927 9661 3931 9757

FLASH FLOOD...RADAR AND GAUGE INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

Baerg

2 follow-up statements

447 
WGUS73 KTOP 150739
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
239 AM CDT Thu Jul 15 2021

KSC027-029-161-150830-
/O.CON.KTOP.FF.W.0021.000000T0000Z-210715T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riley-Clay-Cloud-
239 AM CDT Thu Jul 15 2021

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 330 AM CDT FOR
NORTHWESTERN RILEY...CENTRAL CLAY AND SOUTHEASTERN CLOUD COUNTIES...

At 238 AM CDT, Doppler radar and automated gauges indicated 
thunderstorms producing heavy rain across the warned area. Up to 
four inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar and automated gauges.

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...
Clay Center, Riley, Miltonvale, Leonardville, Morganville, Randolph,
Green, Aurora and Idana.

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 3951 9757 3950 9666 3949 9666 3945 9672
      3943 9673 3941 9672 3940 9673 3937 9668
      3936 9669 3933 9667 3932 9665 3932 9664
      3930 9663 3929 9664 3927 9661 3931 9757

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

Baerg

662 
WGUS73 KTOP 150827
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
327 AM CDT Thu Jul 15 2021

KSC027-029-161-150837-
/O.EXP.KTOP.FF.W.0021.000000T0000Z-210715T0830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Riley-Clay-Cloud-
327 AM CDT Thu Jul 15 2021

...THE FLASH FLOOD WARNING FOR NORTHWESTERN RILEY...CENTRAL CLAY AND
SOUTHEASTERN CLOUD COUNTIES WILL EXPIRE AT 330 AM CDT...

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

LAT...LON 3951 9757 3950 9666 3949 9666 3945 9672
      3943 9673 3941 9672 3940 9673 3937 9668
      3936 9669 3933 9667 3932 9665 3932 9664
      3930 9663 3929 9664 3927 9661 3931 9757

$$

Baerg

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 15, 12:20 AM CDT	Areal Flood Advisory	TOP	Clay, Cloud, Ottawa, Riley	4 hr
Jul 15, 2:19 AM CDT	Flash Flood Warning	TOP	Clay, Dickinson, Geary, Pottawatomie, Riley	4 hr
Jul 15, 3:27 AM CDT	Areal Flood Warning	TOP	Clay, Cloud, Riley	6 hr
Jul 15, 3:31 AM CDT	Flash Flood Watch	TOP	Anderson, Clay, Coffey, Dickinson, Douglas, Franklin and 10 more	16 hr
Jul 15, 3:46 AM CDT	Areal Flood Advisory	TOP	Dickinson, Geary, Morris, Wabaunsee	4 hr
Jul 15, 6:08 AM CDT	Areal Flood Warning	TOP	Clay, Dickinson, Geary, Pottawatomie, Riley	3 hr
Jul 15, 7:34 AM CDT	River Flood Warning	TOP	Riley	15 hr
Jul 15, 9:05 AM CDT	Flash Flood Warning	TOP	Clay, Geary, Riley	4 hr
Jul 15, 9:53 AM CDT	Areal Flood Advisory	TOP	Pottawatomie, Riley	3 hr
Jul 15, 3:28 PM CDT	Special Weather Statement	TOP	Republic	32 min
Jul 15, 4:06 PM CDT	Special Weather Statement	TOP	Republic	24 min
Jul 15, 4:48 PM CDT	Severe Thunderstorm Warning	TOP	Republic	27 min
Jul 15, 4:54 PM CDT	Special Weather Statement	TOP	Cloud	36 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.