Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 37, NWS Louisville, KY

July 16, 2021Trimble County, Kentucky; Jefferson County, Indiana

NWS Louisville, KY issued this flash flood warning at Jul 16, 2021, 10:20 PM EDT for Trimble County, Kentucky; Jefferson County, Indiana. 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: Jul 16, 2021, 10:20 PM EDT (02:20 UTC)
Expired: Jul 17, 2021, 1:30 AM EDT
In force: 3 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Jefferson County, IN, Trimble County, KY

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 2.3 hours before the alert went out and 169 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: 163 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 1176 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 157 m²/s²
0-3 km storm-relative helicity: 168 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted.

640 
WGUS53 KLMK 170220
FFWLMK
INC077-KYC223-170530-
/O.NEW.KLMK.FF.W.0037.210717T0220Z-210717T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
1020 PM EDT Fri Jul 16 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Jefferson County in south central Indiana...
  Northwestern Trimble County in central Kentucky...

* Until 130 AM EDT.

* At 1020 PM EDT, 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...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...
  Madison, Hanover, Smyrna, Kent, Dupont, Wirt, Madison Municipal 
  Airport, Middlefork, North Madison and Ringwald.

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.

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3874 8567 3881 8568 3882 8566 3882 8564
      3882 8563 3882 8561 3885 8561 3885 8557
      3888 8557 3888 8554 3891 8554 3891 8521
      3878 8522 3867 8557 3870 8561 3871 8561
      3871 8562 3872 8565 3873 8565

FLASH FLOOD...RADAR INDICATED

$$

MJ

1 follow-up statement

201 
WGUS73 KLMK 170522
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
122 AM EDT Sat Jul 17 2021

INC077-KYC223-170532-
/O.EXP.KLMK.FF.W.0037.000000T0000Z-210717T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson IN-Trimble KY-
122 AM EDT Sat Jul 17 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 130 AM EDT EARLY THIS MORNING 
FOR JEFFERSON AND NORTHWESTERN TRIMBLE COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 3874 8567 3881 8568 3882 8566 3882 8564
      3882 8563 3882 8561 3885 8561 3885 8557
      3888 8557 3888 8554 3891 8554 3891 8521
      3878 8522 3867 8557 3870 8561 3871 8561
      3871 8562 3872 8565 3873 8565

$$

DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 8:16 PM EDT	Special Weather Statement	LMK	Clinton	44 min
Jul 16, 8:17 PM EDT	Special Weather Statement	LMK	Barren	43 min
Jul 16, 9:32 PM EDT	Special Weather Statement	LMK	Jefferson, Oldham, Trimble	58 min
Jul 16, 10:21 PM EDT	Areal Flood Advisory	LMK	Jefferson, Oldham	3 hr
Jul 16, 10:23 PM EDT	Special Weather Statement	LMK	Anderson, Washington, Woodford	52 min
Jul 16, 10:24 PM EDT	Special Weather Statement	LMK	Jefferson	51 min
Jul 16, 11:49 PM EDT	Special Weather Statement	LMK	Henry	26 min
Jul 17, 12:51 AM EDT	Areal Flood Advisory	LMK	Henry	70 min
Jul 17, 6:37 PM EDT	Areal Flood Advisory	LMK	Allen, Barren	113 min
Jul 16, 10:26 PM EDT	Special Weather Statement	LMK	Jefferson	34 min
Jul 16, 10:35 PM EDT	Areal Flood Advisory	LMK	Crawford, Dubois, Harrison, Orange, Perry, Washington	3 hr
Jul 17, 3:21 AM EDT	River Flood Advisory	LMK	Jefferson, Scott	4 hr
Jul 17, 7:20 AM EDT	River Flood Warning	LMK	Jefferson, Scott	7 hr

Nearby

Flash Flood Warnings in Kentucky, 2021 Flash Flood Warnings in Indiana, 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.