Alert archive / Kentucky / Flash Flood Warnings in 2020

Flash Flood Warning 39, NWS Louisville, KY

June 29, 2020Jefferson County, Kentucky

NWS Louisville, KY issued this flash flood warning at Jun 29, 2020, 8:29 PM EDT for Jefferson County, Kentucky. It was in force for 3 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
Jun 29, 2020, 8:29 PM EDT (00:29 UTC)
Expired
Jun 29, 2020, 11:30 PM EDT
In force
3 hr
Issued by
NWS Louisville, KY
Area
Storm-based polygon
Flood severity
None

County Jefferson County, KY

The radar

The Louisville radar (KLVX), 47 km from the middle of the area, began a volume at 00:28 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

TimeReportWhereRemark
Jun 29, 8:51 PM EDTFLASH FLOOD2 Ne Jeffersontown, KY6 INCHES OF FLOWING WATER OVER MOSER RD. SIMILAR AMOUNT NEARBY ON BLANKENBAKER AND SHELBYVILLE.
Jun 29, 9:17 PM EDTFLASH FLOOD2 Se Jeffersontown, KYWATER OVER TAYLORSVILLE ROAD AT CHENOWETH RUN. PUBLIC REPORT RELAYED BY MEDIA ON 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 199 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-pSkew-T log-p diagram, Cncnati-Daytn, OH at 00:00Z on 2020-06-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 397 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Cncnati-Daytn, OH at 00:00Z on 2020-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
397 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
1513 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
29 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

041 
WGUS53 KLMK 300029
FFWLMK
KYC111-300330-
/O.NEW.KLMK.FF.W.0039.200630T0029Z-200630T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
829 PM EDT Mon Jun 29 2020

The National Weather Service in Louisville has issued a

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

* Until 1130 PM EDT.

* At 828 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 indicated.

  IMPACT...Flooding of small creeks and streams, urban areas, 
           highways, streets and underpasses as well as other 
           drainage and low lying areas.

* Some locations that will experience flooding include...
  Louisville, Jeffersontown, St. Matthews, Lyndon, Middletown,
  Douglass Hills, Prospect, Hurstbourne, Graymoor-Devondale and Windy
  Hills.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

&&

LAT...LON 3835 8558 3834 8557 3834 8556 3829 8547
      3826 8541 3812 8543 3807 8555 3807 8556
      3833 8566 3838 8564

FLASH FLOOD...RADAR INDICATED

$$

KDW
1 follow-up statement
982 
WGUS73 KLMK 300328
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
1128 PM EDT Mon Jun 29 2020

KYC111-300336-
/O.EXP.KLMK.FF.W.0039.000000T0000Z-200630T0330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson KY-
1128 PM EDT Mon Jun 29 2020

...THE FLASH FLOOD WARNING FOR EASTERN JEFFERSON COUNTY WILL EXPIRE
AT 1130 PM EDT...

Flood waters have receded, but a Areal Flood Advisory remains for 
flooding along overflowing rivers and streams. Please continue to 
heed any remaining road closures.

LAT...LON 3835 8558 3834 8557 3834 8556 3829 8547
      3826 8541 3812 8543 3807 8555 3807 8556
      3833 8566 3838 8564

$$

KDW

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 8:06 PM EDTSpecial Weather StatementLMKJefferson24 min
Jun 29, 8:08 PM EDTSpecial Weather StatementLMKTrimble37 min
Jun 29, 8:15 PM EDTFlash Flood WarningLMKCasey, Russell3 hr
Jun 29, 8:15 PM EDTSevere Thunderstorm WarningLMKJefferson, Oldham45 min
Jun 29, 8:28 PM EDTSpecial Weather StatementLMKWashington32 min
Jun 29, 8:45 PM EDTSpecial Weather StatementLMKMarion30 min
Jun 29, 8:56 PM EDTSpecial Weather StatementLMKOldham34 min
Jun 29, 9:14 PM EDTFlash Flood WarningLMKAdair, Casey, Marion, Taylor3 hr
Jun 29, 9:14 PM EDTSpecial Weather StatementLMKMarion, Nelson46 min
Jun 29, 9:33 PM EDTFlash Flood WarningLMKBullitt, Spencer117 min
Jun 29, 9:35 PM EDTSpecial Weather StatementLMKJefferson25 min
Jun 29, 9:38 PM EDTSpecial Weather StatementLMKBullitt37 min
Jun 29, 9:43 PM EDTFlash Flood WarningLMKWashington3 hr
Jun 29, 9:46 PM EDTFlash Flood WarningLMKNelson3 hr
Jun 29, 9:49 PM EDTSpecial Weather StatementLMKAnderson41 min
Jun 29, 10:04 PM EDTFlash Flood WarningLMKBullitt, Nelson3 hr
Jun 29, 10:07 PM EDTSpecial Weather StatementLMKJefferson23 min
Jun 29, 10:10 PM EDTRiver Flood WarningLMKHardin, Nelson66 hr
Jun 29, 11:26 PM EDTAreal Flood AdvisoryLMKBullitt, Jefferson3 hr
Jun 29, 11:46 PM EDTAreal Flood WarningLMKBoyle, Casey, Marion, Taylor, Washington3 hr
Jun 30, 12:45 AM EDTAreal Flood WarningLMKNelson, Washington3 hr
Jun 30, 1:31 AM EDTAreal Flood AdvisoryLMKBourbon, Harrison, Nicholas3 hr
Jun 30, 11:26 AM EDTAreal Flood AdvisoryLMKNicholas95 min
Jun 30, 1:34 PM EDTAreal Flood AdvisoryLMKAdair, Green, Taylor116 min
Jun 30, 6:56 PM EDTSpecial Weather StatementLMKHancock49 min
Jun 30, 7:40 PM EDTSpecial Weather StatementLMKBreckinridge, Hancock, Ohio50 min

Nearby

Flash Flood Warnings in Kentucky, 2020Every flash flood warning in 2020

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.