Alert archive / Kentucky / Flash Flood Warnings in 2018

Flash Flood Warning 49, NWS Louisville, KY

August 17, 2018Monroe County, Kentucky

NWS Louisville, KY issued this flash flood warning at Aug 17, 2018, 5:53 AM CDT for Monroe County, Kentucky. It was in force for 3 hr. 3 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 17, 2018, 5:53 AM CDT (10:53 UTC)
Expired: Aug 17, 2018, 9:00 AM CDT
In force: 3 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

County Monroe County, KY

The radar

The Nashville radar (KOHX), 93 km from the middle of the area, began a volume at 10:51 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 17, 6:00 AM CDT	FLASH FLOOD	1 Se Gamaliel, KY	MONROE COUNTY MESONET REPORTS 2.40 INCHES OF RAIN SINCE MIDNIGHT.
Aug 17, 6:30 AM CDT	FLASH FLOOD	2 E Tompkinsville, KY	WATER FLOWING OVER ROADWAY AT HWY 100 E MAKING IT IMPASSABLE.
Aug 17, 6:30 AM CDT	FLASH FLOOD	2 Sw Rockbridge, KY	WATER FLOWING OVER ROADWAY MAKING IT IMPASSABLE.

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 00:00Z, 10.9 hours before the alert went out and 104 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: 1830 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1024 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

050 
WGUS53 KLMK 171053
FFWLMK
KYC171-171400-
/O.NEW.KLMK.FF.W.0049.180817T1053Z-180817T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
553 AM CDT FRI AUG 17 2018

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Monroe County in south central Kentucky...

* Until 900 AM CDT.

* At 553 AM CDT, Doppler radar indicated thunderstorms producing
  heavy rain across the warned area. Up to two inches of rain have
  already fallen. Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Tompkinsville, Gamaliel, Meshack, Persimmon, Forkton, Gum Tree,
  Harlan Crossroads, Freetown, Sulphur Lick and Lamb.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring.
If you are in the warned area move to higher ground immediately.
Residents living along streams and creeks should take immediate
precautions to protect life and property.

&&

LAT...LON 3663 8592 3674 8595 3676 8591 3684 8564
      3683 8560 3678 8559 3677 8557 3677 8554
      3671 8553 3662 8572

$$

RJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 11:51 PM CDT	Areal Flood Advisory	LMK	Adair, Boyle, Casey, Marion, Taylor	3 hr
Aug 17, 12:52 AM CDT	Special Weather Statement	LMK	Madison	38 min
Aug 17, 2:23 AM CDT	Areal Flood Advisory	LMK	Harrison, Scott	2 hr
Aug 17, 2:45 AM CDT	Flash Flood Warning	LMK	Harrison	3 hr
Aug 17, 8:46 AM CDT	Special Weather Statement	LMK	Bourbon, Clark, Fayette, Garrard, Madison	59 min
Aug 17, 9:30 AM CDT	Special Weather Statement	LMK	Bourbon, Harrison, Nicholas	60 min
Aug 17, 3:20 PM CDT	Areal Flood Advisory	LMK	Franklin, Henry, Shelby	115 min

Nearby

Flash Flood Warnings in Kentucky, 2018 Every flash flood warning in 2018

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.