Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 46, NWS Louisville, KY

August 19, 2021Anderson County, Franklin County, Kentucky

NWS Louisville, KY issued this flash flood warning at Aug 19, 2021, 7:09 AM EDT for Anderson County, Franklin 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: Aug 19, 2021, 7:09 AM EDT (11:09 UTC)
Expired: Aug 19, 2021, 10:15 AM EDT
In force: 3 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Anderson County, KY, Franklin County, KY

The radar

The Louisville radar (KLVX), 92 km from the middle of the area, began a volume at 11:13 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

Cncnati-Daytn, OH (KILN), launched 00:00Z, 11.2 hours before the alert went out and 173 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: 405 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1175 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

246 
WGUS53 KLMK 191109
FFWLMK
KYC005-073-191415-
/O.NEW.KLMK.FF.W.0046.210819T1109Z-210819T1415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
709 AM EDT Thu Aug 19 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Northeastern Anderson County in central Kentucky...
  Southwestern Franklin County in central Kentucky...

* Until 1015 AM EDT.

* At 709 AM EDT, Doppler radar indicated heavy rain across the 
  warned area. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by heavy rain.

  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...
  Frankfort, Evergreen, Broadville Manor, Capital City Airport, 
  Bridgeport, Farmdale and Big Eddy.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3813 8499 3822 8489 3819 8483 3814 8486
      3814 8487 3813 8487 3809 8496 3811 8499

FLASH FLOOD...RADAR INDICATED

$$

KDW

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 8:37 PM EDT	Areal Flood Advisory	LMK	Ohio	113 min
Aug 19, 5:25 AM EDT	Areal Flood Advisory	LMK	Hancock	3 hr
Aug 19, 6:46 AM EDT	Areal Flood Advisory	LMK	Spencer	3 hr
Aug 19, 6:48 AM EDT	Areal Flood Advisory	LMK	Bullitt	3 hr
Aug 19, 7:00 AM EDT	Areal Flood Advisory	LMK	Anderson, Franklin, Woodford	3 hr
Aug 19, 7:22 AM EDT	Areal Flood Advisory	LMK	Bullitt, Jefferson, Shelby, Spencer	3 hr
Aug 19, 7:58 AM EDT	Areal Flood Advisory	LMK	Anderson, Bullitt, Nelson, Shelby, Spencer	2 hr
Aug 19, 8:26 AM EDT	Areal Flood Advisory	LMK	Anderson, Franklin, Henry, Shelby	2 hr
Aug 19, 9:06 AM EDT	Areal Flood Advisory	LMK	Anderson, Marion, Nelson, Washington, Woodford	114 min
Aug 19, 3:36 PM EDT	Dense Fog Advisory	LMK	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 43 more	18 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.