Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 56, NWS Louisville, KY

September 15, 2021Marion County, Kentucky

NWS Louisville, KY issued this flash flood warning at Sep 15, 2021, 12:12 PM EDT for Marion County, Kentucky. It was in force for 117 min. 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, 12:12 PM EDT (16:12 UTC)
Expired: Sep 15, 2021, 2:09 PM EDT
In force: 117 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

County Marion County, KY

The radar

The Louisville radar (KLVX), 76 km from the middle of the area, began a volume at 16:15 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, 4.2 hours before the alert went out and 203 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.

846 
WGUS53 KLMK 151612
FFWLMK
KYC155-151915-
/O.NEW.KLMK.FF.W.0056.210915T1612Z-210915T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
1212 PM EDT Wed Sep 15 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Central Marion County in central Kentucky...

* Until 315 PM EDT.

* At 1212 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1.5 and 3 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...
  Lebanon, Loretto, Raywick, Saint Mary, Penick, Poplar Corner, 
  Riley and Gravel Switch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

&&

LAT...LON 3755 8504 3756 8551 3760 8550 3762 8549
      3763 8521 3763 8503 3760 8503

FLASH FLOOD...RADAR INDICATED

$$

BJS

1 follow-up statement

663 
WGUS73 KLMK 151809
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
209 PM EDT Wed Sep 15 2021

KYC155-151819-
/O.CAN.KLMK.FF.W.0056.000000T0000Z-210915T1915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion KY-
209 PM EDT Wed Sep 15 2021

...FLASH FLOOD WARNING IS CANCELLED FOR CENTRAL MARION COUNTY...

The heavy rain has ended and calls to the county have yielded no 
flooding issues. Therefore, the flash flooding threat has ended.

A Flash Flood Watch remains in effect until 800 PM EDT for portions 
of east central Kentucky, north central Kentucky, northwest Kentucky 
and south central Kentucky.

LAT...LON 3755 8504 3756 8551 3760 8550 3762 8549
      3763 8521 3763 8503 3760 8503

$$

BJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 15, 7:16 AM EDT	Areal Flood Advisory	LMK	Larue, Nelson, Washington	106 min
Sep 15, 7:52 AM EDT	Areal Flood Advisory	LMK	Grayson, Hardin	3 hr
Sep 15, 8:14 AM EDT	Flash Flood Watch	LMK	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 28 more	12 hr
Sep 15, 8:50 AM EDT	Flash Flood Warning	LMK	Hardin, Larue, Marion, Nelson, Washington	4 hr
Sep 15, 9:12 AM EDT	Flash Flood Warning	LMK	Butler, Grayson	3 hr
Sep 15, 10:25 AM EDT	Areal Flood Advisory	LMK	Clark, Fayette, Jessamine, Madison	4 hr
Sep 15, 11:11 AM EDT	Areal Flood Advisory	LMK	Boyle, Marion, Mercer, Washington	3 hr
Sep 15, 12:05 PM EDT	Areal Flood Advisory	LMK	Marion	7 min
Sep 15, 12:22 PM EDT	Areal Flood Advisory	LMK	Logan, Simpson	11 min
Sep 15, 12:33 PM EDT	Flash Flood Warning	LMK	Logan, Simpson	3 hr
Sep 15, 1:31 PM EDT	Areal Flood Advisory	LMK	Allen, Logan, Simpson, Warren	3 hr
Sep 15, 5:59 PM EDT	Areal Flood Advisory	LMK	Franklin	2 hr
Sep 15, 6:51 PM EDT	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.