Alert archive / Kentucky / Flash Flood Warnings in 2021

Flash Flood Warning 47, NWS Louisville, KY

August 26, 2021Jefferson County, Kentucky

NWS Louisville, KY issued this flash flood warning at Aug 26, 2021, 8:29 PM EDT for Jefferson County, Kentucky. It was in force for 2 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 26, 2021, 8:29 PM EDT (00:29 UTC)
Expired: Aug 26, 2021, 10:30 PM EDT
In force: 2 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

County Jefferson County, KY

The radar

The Louisville radar (KLVX), 36 km from the middle of the area, began a volume at 00:31 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.

What was reported inside it

Time	Report	Where	Remark
Aug 26, 8:40 PM EDT	FLOOD	Louisville, KY	ANKLE DEEP WATER; REPORT RELAYED VIA WDRB ON TWITTER.
Aug 26, 8:46 PM EDT	FLASH FLOOD	1 Wnw Louisville, KY	TWO CARS STRANDED IN FLOODED ROADWAY; PEOPLE STRANDED ON CARS AT 13TH AND MARKET STREETS IN LOUISVILLE. REPORT RELAYED VIA TWITTER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.5 hours before the alert went out and 213 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1937 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

486 
WGUS53 KLMK 270029
FFWLMK
KYC111-270230-
/O.NEW.KLMK.FF.W.0047.210827T0029Z-210827T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
829 PM EDT Thu Aug 26 2021

The National Weather Service in Louisville has issued a

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

* Until 1030 PM EDT.

* At 829 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. 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...
  Louisville, Jeffersonville and Clarksville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Please report flooding to your local law enforcement agency when you 
can do so safely and have them relay your report to the National 
Weather Service in Louisville.

&&

LAT...LON 3827 8573 3827 8572 3822 8572 3822 8576
      3823 8579 3828 8579 3828 8577 3827 8576
      3827 8575 3827 8574

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR

$$

MCK

1 follow-up statement

617 
WGUS73 KLMK 270222
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
1022 PM EDT Thu Aug 26 2021

KYC111-270232-
/O.EXP.KLMK.FF.W.0047.000000T0000Z-210827T0230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson KY-
1022 PM EDT Thu Aug 26 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM EDT THIS EVENING FOR 
CENTRAL JEFFERSON COUNTY...

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.

LAT...LON 3827 8573 3827 8572 3822 8572 3822 8576
      3823 8579 3828 8579 3828 8577 3827 8576
      3827 8575 3827 8574

$$

MCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 8:00 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson	30 min
Aug 27, 12:53 PM EDT	Special Weather Statement	LMK	Ohio	52 min
Aug 27, 1:31 PM EDT	Areal Flood Advisory	LMK	Butler, Edmonson, Grayson, Hart, Warren	3 hr
Aug 27, 2:54 PM EDT	Areal Flood Advisory	LMK	Fayette	2 hr
Aug 27, 3:06 PM EDT	Areal Flood Advisory	LMK	Adair, Casey, Taylor	3 hr
Aug 27, 3:11 PM EDT	Special Weather Statement	LMK	Washington	34 min
Aug 27, 3:15 PM EDT	Areal Flood Advisory	LMK	Jessamine, Mercer, Woodford	3 hr
Aug 27, 3:28 PM EDT	Areal Flood Advisory	LMK	Madison	3 hr
Aug 27, 3:41 PM EDT	Special Weather Statement	LMK	Mercer	34 min
Aug 27, 3:45 PM EDT	Special Weather Statement	LMK	Anderson, Woodford	15 min
Aug 27, 3:49 PM EDT	Special Weather Statement	LMK	Oldham	26 min
Aug 27, 3:59 PM EDT	Special Weather Statement	LMK	Bourbon	31 min
Aug 27, 4:07 PM EDT	Special Weather Statement	LMK	Franklin	23 min
Aug 27, 4:17 PM EDT	Areal Flood Advisory	LMK	Bourbon, Clark, Fayette, Nicholas	3 hr
Aug 27, 4:21 PM EDT	Areal Flood Advisory	LMK	Anderson, Franklin, Shelby	3 hr
Aug 27, 4:25 PM EDT	Special Weather Statement	LMK	Lincoln	35 min
Aug 27, 4:32 PM EDT	Areal Flood Advisory	LMK	Boyle, Garrard, Jessamine, Lincoln	3 hr
Aug 27, 4:43 PM EDT	Special Weather Statement	LMK	Harrison	17 min
Aug 27, 5:36 PM EDT	Areal Flood Advisory	LMK	Harrison, Scott	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.