Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 35, NWS Louisville, KY

July 12, 2021Clark County, Scott County, Indiana

NWS Louisville, KY issued this flash flood warning at Jul 12, 2021, 9:46 AM EDT for Clark County, Scott County, Indiana. It was in force for 118 min. 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: Jul 12, 2021, 9:46 AM EDT (13:46 UTC)
Expired: Jul 12, 2021, 11:44 AM EDT
In force: 118 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Clark County, IN, Scott County, IN

The radar

The Louisville radar (KLVX), 67 km from the middle of the area, began a volume at 13:47 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
Jul 12, 11:00 AM EDT	FLASH FLOOD	3 Ne Henryville, IN	FLOODING OVER HEIL RD. IN CLARK COUNTY.
Jul 12, 11:00 AM EDT	FLASH FLOOD	3 Sw Blocher, IN	MULTIPLE ROADS FLOODED EAST OF SCOTTSBURG, THEY HAVE SINCE CLEARED.

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 12:00Z, 1.8 hours before the alert went out and 195 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: 143 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 647 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 58 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

563 
WGUS53 KLMK 121346
FFWLMK
INC019-143-121645-
/O.NEW.KLMK.FF.W.0035.210712T1346Z-210712T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
946 AM EDT Mon Jul 12 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  North Central Clark County in south central Indiana...
  Southeastern Scott County in south central Indiana...

* Until 1245 PM EDT.

* At 946 AM EDT, 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...
  Scottsburg, Vienna, Henryville, Underwood, Memphis, Blue Lick, 
  Wilson and Bennettsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3857 8583 3866 8578 3871 8570 3867 8565
      3861 8564 3848 8570 3843 8576 3842 8583
      3849 8584

FLASH FLOOD...RADAR INDICATED

$$

DM

1 follow-up statement

397 
WGUS73 KLMK 121544
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
1144 AM EDT Mon Jul 12 2021

INC019-143-121554-
/O.CAN.KLMK.FF.W.0035.000000T0000Z-210712T1645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clark IN-Scott IN-
1144 AM EDT Mon Jul 12 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTH CENTRAL CLARK AND 
SOUTHEASTERN SCOTT COUNTIES...

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 3866 8578 3871 8570 3867 8565 3861 8564
      3848 8570 3845 8574 3846 8576 3849 8578
      3856 8578

$$

DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 9:18 AM EDT	Areal Flood Advisory	LMK	Clark, Floyd, Scott	2 hr
Jul 12, 5:36 PM EDT	Areal Flood Advisory	LMK	Crawford, Harrison, Orange, Perry, Washington	3 hr
Jul 12, 6:14 PM EDT	Special Weather Statement	LMK	Perry	46 min
Jul 12, 6:47 PM EDT	Special Weather Statement	LMK	Crawford	43 min

Nearby

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.