Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 18, NWS Louisville, KY

May 4, 2021Butler County, Logan County, Kentucky

NWS Louisville, KY issued this flash flood warning at May 4, 2021, 8:45 PM CDT for Butler County, Logan County, Kentucky. 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 4, 2021, 8:45 PM CDT (01:45 UTC)
Expired: May 4, 2021, 11:45 PM CDT
In force: 3 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Butler County, KY, Logan County, KY

The radar

The Ft Campbell radar (KHPX), 54 km from the middle of the area, began a volume at 01:46 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

Nashville Metro, TN (KBNA), launched 00:00Z, 1.8 hours before the alert went out and 107 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: 539 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

The text

As transmitted.

340 
WGUS53 KLMK 050145
FFWLMK
KYC031-141-050445-
/O.NEW.KLMK.FF.W.0018.210505T0145Z-210505T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
845 PM CDT Tue May 4 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Southwestern Butler County in south central Kentucky...
  Northern Logan County in south central Kentucky...

* Until 1145 PM CDT.

* At 844 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. 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...
  Russellville, Lewisburg, Woodbury, Insco, Homer, Quality, 
  Harreldsville, Lost City, Beechland and Harper Crossroads.

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 3707 8694 3709 8690 3711 8690 3711 8689
      3713 8690 3713 8691 3714 8693 3718 8692
      3719 8660 3718 8662 3715 8661 3700 8667
      3699 8667 3704 8686 3683 8675 3684 8705
      3706 8705

FLASH FLOOD...RADAR INDICATED

$$

KDW

1 follow-up statement

518 
WGUS73 KLMK 050438
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
1138 PM CDT Tue May 4 2021

KYC031-141-050448-
/O.EXP.KLMK.FF.W.0018.000000T0000Z-210505T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butler KY-Logan KY-
1138 PM CDT Tue May 4 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1145 PM CDT THIS EVENING FOR 
SOUTHWESTERN BUTLER AND NORTHERN LOGAN COUNTIES...

The heavy rain has ended, and the Flash Flood threat is ending. 
However, flooded areas are still likely so an Areal Flood Warning 
will replace this warning.

A Flash Flood Watch remains in effect until 400 AM CDT for a portion 
of south central Kentucky.

LAT...LON 3707 8694 3709 8690 3711 8690 3711 8689
      3713 8690 3713 8691 3714 8693 3718 8692
      3719 8660 3718 8662 3715 8661 3700 8667
      3699 8667 3704 8686 3683 8675 3684 8705
      3706 8705

$$

BJS

The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 7:09 PM CDT	Special Weather Statement	LMK	Marion, Washington	36 min
May 4, 7:10 PM CDT	Special Weather Statement	LMK	Logan	35 min
May 4, 7:14 PM CDT	Tornado Warning	LMK	Marion, Washington	31 min
May 4, 7:20 PM CDT	Special Weather Statement	LMK	Edmonson, Warren	40 min
May 4, 7:30 PM CDT	Flash Flood Warning	LMK	Barren, Edmonson, Logan, Warren	4 hr
May 4, 7:36 PM CDT	Severe Thunderstorm Warning	LMK	Washington	24 min
May 4, 7:46 PM CDT	Special Weather Statement	LMK	Larue	29 min
May 4, 7:55 PM CDT	Special Weather Statement	LMK	Mercer	35 min
May 4, 8:02 PM CDT	Special Weather Statement	LMK	Butler	13 min
May 4, 8:08 PM CDT	Special Weather Statement	LMK	Hart	37 min
May 4, 8:14 PM CDT	Special Weather Statement	LMK	Marion	31 min
May 4, 8:18 PM CDT	Severe Thunderstorm Warning	LMK	Larue, Marion, Nelson	27 min
May 4, 8:29 PM CDT	Special Weather Statement	LMK	Jessamine	61 min
May 4, 9:00 PM CDT	Special Weather Statement	LMK	Logan	30 min
May 4, 11:36 PM CDT	Areal Flood Warning	LMK	Butler, Logan	5 hr
May 5, 6:59 AM CDT	River Flood Advisory	LMK	Hart	3 hr
May 5, 9:22 AM CDT	River Flood Advisory	LMK	Hardin, Nelson	16 hr
May 5, 10:26 AM CDT	River Flood Warning	LMK	Hart	7 hr
May 5, 3:08 PM CDT	River Flood Advisory	LMK	Bourbon	10 hr

Nearby

Flash Flood Warnings in Kentucky, 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.