Alert archive / Kansas / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Topeka, KS

May 25, 2021Washington County, Kansas

NWS Topeka, KS issued this flash flood warning at May 25, 2021, 6:46 PM CDT for Washington County, Kansas. It was in force for 2 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: May 25, 2021, 6:46 PM CDT (23:46 UTC)
Expired: May 25, 2021, 9:15 PM CDT
In force: 2 hr
Issued by: NWS Topeka, KS
Area: Storm-based polygon
Flood severity: None

County Washington County, KS

The radar

The Topeka radar (KTWX), 101 km from the middle of the area, began a volume at 23:47 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
May 25, 7:19 PM CDT	HEAVY RAIN 2	1 W Greenleaf, KS	STILL RAINING...NO REPORT OF FLOODING AT THE TIME.

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, 11.8 hours before the alert went out and 135 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: 151 J/kg
Mixed-layer CIN: -248 J/kg
Mixed-layer LCL: 676 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 172 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

125 
WGUS53 KTOP 252346
FFWTOP
KSC201-260215-
/O.NEW.KTOP.FF.W.0007.210525T2346Z-210526T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Topeka KS
646 PM CDT Tue May 25 2021

The National Weather Service in Topeka has issued a

* Flash Flood Warning for...
  East Central Washington County in north central Kansas...

* Until 915 PM CDT.

* At 646 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  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 flash flooding include...
  Greenleaf and Barnes.

Additional rainfall amounts up to 2 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 3983 9703 3983 9681 3977 9681 3975 9681
      3974 9681 3972 9681 3971 9681 3969 9681
      3969 9703

FLASH FLOOD...RADAR INDICATED

$$

Gargan

2 follow-up statements

118 
WGUS73 KTOP 260145
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
845 PM CDT Tue May 25 2021

KSC201-260215-
/O.CON.KTOP.FF.W.0007.000000T0000Z-210526T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington KS-
845 PM CDT Tue May 25 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM CDT THIS 
EVENING FOR EAST CENTRAL WASHINGTON COUNTY...

At 844 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. Flash flooding is ongoing or expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Doppler radar.

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 flash flooding include...
  Greenleaf and Barnes.

Additional rainfall amounts of 0.5 to 1 inch 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 3983 9703 3983 9681 3977 9681 3975 9681
      3974 9681 3972 9681 3971 9681 3969 9681
      3969 9703

FLASH FLOOD...RADAR INDICATED

$$

Gargan

736 
WGUS73 KTOP 260212
FFSTOP

Flash Flood Statement
National Weather Service Topeka KS
912 PM CDT Tue May 25 2021

KSC201-260222-
/O.EXP.KTOP.FF.W.0007.000000T0000Z-210526T0215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Washington KS-
912 PM CDT Tue May 25 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 915 PM CDT THIS EVENING FOR 
EAST CENTRAL WASHINGTON COUNTY...

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

LAT...LON 3983 9703 3983 9681 3977 9681 3975 9681
      3974 9681 3972 9681 3971 9681 3969 9681
      3969 9703

$$

Gargan

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 4:20 PM CDT	Special Weather Statement	TOP	Ottawa	25 min
May 25, 4:40 PM CDT	Special Weather Statement	TOP	Washington	35 min
May 25, 4:47 PM CDT	Severe Thunderstorm Warning	TOP	Ottawa	28 min
May 25, 4:56 PM CDT	Special Weather Statement	TOP	Washington	34 min
May 25, 5:15 PM CDT	Special Weather Statement	TOP	Ottawa	30 min
May 25, 5:17 PM CDT	Special Weather Statement	TOP	Washington	28 min
May 25, 5:25 PM CDT	Severe Thunderstorm Warning	TOP	Marshall, Washington	40 min
May 25, 5:40 PM CDT	Severe Thunderstorm Warning	TOP	Washington	50 min
May 25, 5:49 PM CDT	Severe Thunderstorm Warning	TOP	Marshall	26 min
May 25, 6:17 PM CDT	Flash Flood Warning	TOP	Washington	3 hr
May 25, 6:23 PM CDT	Areal Flood Advisory	TOP	Marshall, Washington	3 hr
May 25, 6:38 PM CDT	Special Weather Statement	TOP	Washington	22 min
May 25, 6:51 PM CDT	Special Weather Statement	TOP	Marshall	24 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.