Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 55, NWS Louisville, KY

September 15, 2021Butler County, Grayson County, Kentucky

NWS Louisville, KY issued this flash flood warning at Sep 15, 2021, 8:12 AM CDT for Butler County, Grayson 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: Sep 15, 2021, 8:12 AM CDT (13:12 UTC)
Expired: Sep 15, 2021, 11:15 AM CDT
In force: 3 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Butler County, KY, Grayson County, KY

The radar

The Louisville radar (KLVX), 80 km from the middle of the area, began a volume at 13:16 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 12:00Z, 1.2 hours before the alert went out and 139 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: 843 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

886 
WGUS53 KLMK 151312
FFWLMK
KYC031-085-151615-
/O.NEW.KLMK.FF.W.0055.210915T1312Z-210915T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
812 AM CDT Wed Sep 15 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Southwestern Grayson County in central Kentucky...
  Northeastern Butler County in south central Kentucky...

* Until 1115 AM CDT.

* At 812 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2.5 inches of 
  rain have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  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...
  Leitchfield, Casey, Caneyville, Peth, Ready, Shrewsbury, Decker, 
  Millwood, Sadler and Black Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3744 8649 3749 8632 3746 8619 3737 8624
      3734 8640 3732 8646 3732 8647 3728 8662
      3730 8672 3737 8661

FLASH FLOOD...RADAR INDICATED

$$

DM

1 follow-up statement

469 
WGUS73 KLMK 151617
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
1117 AM CDT Wed Sep 15 2021

KYC031-085-151627-
/O.EXP.KLMK.FF.W.0055.000000T0000Z-210915T1615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Butler KY-Grayson KY-
1117 AM CDT Wed Sep 15 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN GRAYSON AND 
NORTHEASTERN BUTLER 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.

A Flash Flood Watch remains in effect until 700 PM CDT Wednesday for 
portions of east central Kentucky, north central Kentucky, northwest 
Kentucky and south central Kentucky.

LAT...LON 3744 8649 3749 8632 3746 8619 3737 8624
      3734 8640 3732 8646 3732 8647 3728 8662
      3730 8672 3737 8661

$$

BJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 6:16 AM CDT	Areal Flood Advisory	LMK	Larue, Nelson, Washington	106 min
Sep 15, 6:52 AM CDT	Areal Flood Advisory	LMK	Grayson, Hardin	3 hr
Sep 15, 7:14 AM CDT	Flash Flood Watch	LMK	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more	12 hr
Sep 15, 7:50 AM CDT	Flash Flood Warning	LMK	Hardin, Larue, Marion, Nelson, Washington	4 hr
Sep 15, 9:25 AM CDT	Areal Flood Advisory	LMK	Clark, Fayette, Jessamine, Madison	4 hr
Sep 15, 10:11 AM CDT	Areal Flood Advisory	LMK	Boyle, Marion, Mercer, Washington	3 hr
Sep 15, 11:05 AM CDT	Areal Flood Advisory	LMK	Marion	7 min
Sep 15, 11:12 AM CDT	Flash Flood Warning	LMK	Marion	117 min
Sep 15, 11:22 AM CDT	Areal Flood Advisory	LMK	Logan, Simpson	11 min
Sep 15, 11:33 AM CDT	Flash Flood Warning	LMK	Logan, Simpson	3 hr
Sep 15, 12:31 PM CDT	Areal Flood Advisory	LMK	Allen, Logan, Simpson, Warren	3 hr
Sep 15, 4:59 PM CDT	Areal Flood Advisory	LMK	Franklin	2 hr
Sep 15, 5:51 PM CDT	Areal Flood Advisory	LMK	Larue	114 min

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.