Alert archive / Kentucky / Flash Flood Warnings in 2021
Flash Flood Warning 45, NWS Louisville, KY
NWS Louisville, KY issued this flash flood warning at Aug 18, 2021, 4:20 PM CDT for Simpson County, Kentucky. It was in force for 3 hr. 1 report 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 18, 2021, 4:20 PM CDT (21:20 UTC)
- Expired
- Aug 18, 2021, 7:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Louisville, KY
- Area
- Storm-based polygon
- Flood severity
- None
County Simpson County, KY
The radar
The Nashville radar (KOHX), 57 km from the middle of the area, began a volume at 21:21 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 18, 4:30 PM CDT | FLASH FLOOD | 4 W Franklin, KY | DISPATCH REPORTS WATER OVER KY 100. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Nashville Metro, TN (KBNA), launched 12:00Z, 9.3 hours before the alert went out and 70 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.
- Mixed-layer CAPE
- 259 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 919 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 70 m²/s²
- 0-3 km storm-relative helicity
- 72 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
480
WGUS53 KLMK 182120
FFWLMK
KYC213-190030-
/O.NEW.KLMK.FF.W.0045.210818T2120Z-210819T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
420 PM CDT Wed Aug 18 2021
The National Weather Service in Louisville has issued a
* Flash Flood Warning for...
Central Simpson County in south central Kentucky...
* Until 730 PM CDT.
* At 420 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1.5 and 2.5 inches of
rain have fallen. Additional rainfall amounts of 0.5 to 1 inch 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...
Franklin, Salmons, Hillsdale, Neosheo and Prices Mill.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3681 8640 3667 8658 3668 8673 3674 8667
3683 8658
FLASH FLOOD...RADAR INDICATED
$$
MJ2 follow-up statements
781
WGUS73 KLMK 182217
FFSLMK
Flash Flood Statement
National Weather Service Louisville KY
517 PM CDT Wed Aug 18 2021
KYC213-190030-
/O.CON.KLMK.FF.W.0045.000000T0000Z-210819T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Simpson KY-
517 PM CDT Wed Aug 18 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT THIS
EVENING FOR CENTRAL SIMPSON COUNTY...
At 517 PM CDT, Doppler radar continued to indicate thunderstorms
producing heavy rain across the warned area. Between 2 and 3 inches
of rain have fallen. Additional rainfall amounts of 0.5 to 1 inch
are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Franklin, Salmons, Hillsdale, Neosheo and Prices Mill.
Law enforcement reported at 430 PM that water was covering Kentucky
Road 100 between Franklin and Middleton.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3681 8640 3667 8658 3668 8673 3674 8667
3683 8658
FLASH FLOOD...RADAR INDICATED
$$
MJ840
WGUS73 KLMK 190025
FFSLMK
Flash Flood Statement
National Weather Service Louisville KY
725 PM CDT Wed Aug 18 2021
KYC213-190035-
/O.EXP.KLMK.FF.W.0045.000000T0000Z-210819T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Simpson KY-
725 PM CDT Wed Aug 18 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 730 PM CDT THIS EVENING FOR
CENTRAL SIMPSON COUNTY...
Light to moderate rainfall will continue through the evening.
However, the threat of heavy rainfall and flash flooding has ended.
Water levels in creeks, streams, and drainage ditches will continue
to run high for a while.
Stay tuned to NOAA weather radio and your local media for the latest
updates.
LAT...LON 3681 8640 3667 8658 3668 8673 3674 8667
3683 8658
$$
MJThe office that day
Everything else NWS Louisville, KY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:08 PM CDT | Areal Flood Advisory | LMK | Clinton, Cumberland, Monroe | 112 min |
| Aug 18, 3:09 PM CDT | Areal Flood Advisory | LMK | Butler, Grayson | 111 min |
| Aug 18, 3:32 PM CDT | Areal Flood Advisory | LMK | Allen, Simpson, Warren | 3 hr |
| Aug 18, 4:47 PM CDT | Areal Flood Advisory | LMK | Logan | 118 min |
Nearby
Flash Flood Warnings in Kentucky, 2021Every 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.