Alert archive / Indiana / Flash Flood Warnings in 2021

Flash Flood Warning 23, NWS Louisville, KY

June 18, 2021Jefferson County, Indiana

NWS Louisville, KY issued this flash flood warning at Jun 18, 2021, 11:39 PM EDT for Jefferson County, Indiana. It was in force for 6 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: Jun 18, 2021, 11:39 PM EDT (03:39 UTC)
Expired: Jun 19, 2021, 5:45 AM EDT
In force: 6 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

County Jefferson County, IN

The radar

The Louisville radar (KLVX), 98 km from the middle of the area, began a volume at 03:42 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
Jun 19, 12:42 AM EDT	FLASH FLOOD	2 Se Madison, IN	JEFFERSON COUNTY DISPATCH REPORTED A LOT OF ONGOING FLOODING WITH SEVERAL INSTANCES OF VEHICLES STRANDED IN FLOWING WATER IN MADISON. NO MOTORISTS IN DANGER AT THIS TIME.

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, 3.7 hours before the alert went out and 164 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: 2257 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 1236 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 214 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 17.6

Open this sounding in Storm Lab

The text

As transmitted.

847 
WGUS53 KLMK 190339
FFWLMK
INC077-190945-
/O.NEW.KLMK.FF.W.0023.210619T0339Z-210619T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Louisville KY
1139 PM EDT Fri Jun 18 2021

The National Weather Service in Louisville has issued a

* Flash Flood Warning for...
  Central Jefferson County in south central Indiana...

* Until 545 AM EDT Saturday.

* At 1139 PM EDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches 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...
  Madison, Hanover, Smyrna, Kent, Dupont, Volga, Madison Municipal 
  Airport, Wirt, Five Points and Wakefield.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3869 8546 3882 8568 3882 8564 3882 8563
      3882 8561 3885 8561 3885 8557 3888 8557
      3888 8554 3890 8554 3874 8530 3873 8536
      3874 8542 3871 8545

FLASH FLOOD...RADAR INDICATED

$$

BJS

1 follow-up statement

595 
WGUS73 KLMK 190939
FFSLMK

Flash Flood Statement
National Weather Service Louisville KY
539 AM EDT Sat Jun 19 2021

INC077-190949-
/O.EXP.KLMK.FF.W.0023.000000T0000Z-210619T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Jefferson IN-
539 AM EDT Sat Jun 19 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 545 AM EDT EARLY THIS MORNING 
FOR CENTRAL JEFFERSON COUNTY...

Flood waters continue to recede. Please continue to heed remaining 
road closures.

A Flash Flood Watch remains in effect until 1000 AM EDT for portions 
of Indiana and north central Kentucky.

LAT...LON 3869 8546 3882 8568 3882 8564 3882 8563
      3882 8561 3885 8561 3885 8557 3888 8557
      3888 8554 3890 8554 3874 8530 3873 8536
      3874 8542 3871 8545

$$

RAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 10:29 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson, Scott	31 min
Jun 18, 10:59 PM EDT	Special Weather Statement	LMK	Jefferson	31 min
Jun 18, 11:20 PM EDT	Special Weather Statement	LMK	Jefferson	25 min
Jun 18, 11:27 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson	33 min
Jun 18, 11:50 PM EDT	Special Weather Statement	LMK	Orange, Washington	25 min
Jun 19, 12:12 AM EDT	Special Weather Statement	LMK	Scott	33 min
Jun 19, 12:48 AM EDT	Special Weather Statement	LMK	Clark, Jefferson	27 min
Jun 19, 1:07 AM EDT	Areal Flood Advisory	LMK	Jefferson	3 hr
Jun 19, 7:15 AM EDT	Special Weather Statement	LMK	Clark, Crawford, Dubois, Orange, Scott, Washington	45 min
Jun 19, 7:53 AM EDT	Special Weather Statement	LMK	Clark, Jefferson, Scott	37 min
Jun 19, 8:27 AM EDT	Special Weather Statement	LMK	Harrison	33 min
Jun 19, 11:30 AM EDT	Special Weather Statement	LMK	Dubois, Orange, Washington	45 min
Jun 19, 12:02 PM EDT	Special Weather Statement	LMK	Harrison	28 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.