Alert archive / Indiana / Freeze Warnings in 2021

Freeze Warning 4, NWS Louisville, KY

April 20, 202110 counties in Indiana; Trimble County, Kentucky

NWS Louisville, KY issued this freeze warning at Apr 20, 2021, 3:36 AM EDT for 10 counties in Indiana; Trimble County, Kentucky. It took effect at Apr 21, 2021, 3:00 AM EDT. It was in force for 7 hr. 7 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Apr 20, 2021, 3:36 AM EDT (07:36 UTC)
In effect from: Apr 21, 2021, 3:00 AM EDT
Expired: Apr 21, 2021, 10:00 AM EDT
In force: 7 hr
Issued by: NWS Louisville, KY

Counties Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Washington County, IN, Trimble County, KY

The radar

The Louisville radar (KLVX), 54 km from the middle of the area, began a volume at 07:37 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
Apr 21, 6:00 AM EDT	SNOW 0.7	Huntingburg, IN
Apr 21, 7:00 AM EDT	SNOW 0.5	1 N Mckinley, IN
Apr 21, 7:00 AM EDT	SNOW 0.5	1 Nw Jeffersonville, IN
Apr 21, 7:00 AM EDT	SNOW 1.4	2 Nne North Madison, IN
Apr 21, 7:00 AM EDT	SNOW 2	3 E Henryville, IN
Apr 21, 8:00 AM EDT	SNOW 2.9	3 Wsw Saint Joseph, IN
Apr 21, 9:00 AM EDT	SNOW 1.8	3 N Wyandotte, IN

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, 7.6 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2301 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 124 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

428 
WWUS73 KLMK 200736
NPWLMK

URGENT - WEATHER MESSAGE
National Weather Service Louisville KY
336 AM EDT Tue Apr 20 2021

INZ076>079-083-084-089>092-KYZ032-202000-
/O.NEW.KLMK.FZ.W.0004.210421T0700Z-210421T1400Z/
/O.NEW.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
Orange-Washington-Scott-Jefferson-Dubois-Crawford-Perry-Harrison-
Floyd-Clark-Trimble-
Including the cities of Paoli, Salem, Scottsburg, Madison, 
Jasper, English, Tell City, Corydon, New Albany, Jeffersonville, 
Bedford, and Milton
336 AM EDT Tue Apr 20 2021 /236 AM CDT Tue Apr 20 2021/

...FREEZE WARNING IN EFFECT FROM 3 AM EDT /2 AM CDT/ TO 10 AM EDT
/9 AM CDT/ WEDNESDAY...
...FREEZE WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY MORNING...

* WHAT...Temperatures are expected to fall into the 29-32 degree
  range late tonight into early Wednesday morning...and may do so again
  late Wednesday night into early Thursday morning.

* WHERE...Portions of and south central Indiana and north central
  Kentucky for the warning tonight. All of southern Indiana and
  central Kentucky for the watch tomorrow night.

* WHEN...For the Freeze Warning, from 3 AM EDT /2 AM CDT/ to 10 
  AM EDT /9 AM CDT/ Wednesday. For the Freeze Watch, from late 
  Wednesday night through Thursday morning.

* IMPACTS...Freeze conditions will kill sensitive vegetation.

* ADDITIONAL DETAILS...wind chills early Wednesday morning will be
  in the lower and middle 20s.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have 
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

KYZ023>031-033>043-045>049-053>057-061>067-070>078-081-082-202000-
/O.NEW.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
Hancock-Breckinridge-Meade-Ohio-Grayson-Hardin-Bullitt-Jefferson-
Oldham-Henry-Shelby-Franklin-Scott-Harrison-Spencer-Anderson-
Woodford-Fayette-Bourbon-Nicholas-Nelson-Washington-Mercer-
Jessamine-Clark-Larue-Marion-Boyle-Garrard-Madison-Butler-
Edmonson-Hart-Green-Taylor-Casey-Lincoln-Logan-Warren-Simpson-
Allen-Barren-Monroe-Metcalfe-Adair-Russell-Cumberland-Clinton-
Including the cities of Lewisport, Hawesville, Hardinsburg, 
Brandenburg, Hartford, Leitchfield, Elizabethtown, 
Shepherdsville, Louisville, La Grange, New Castle, Shelbyville, 
Frankfort, Georgetown, Cynthiana, Taylorsville, Lawrenceburg, 
Versailles, Lexington, Paris, Carlisle, Bardstown, Springfield, 
Harrodsburg, Nicholasville, Winchester, Hodgenville, Lebanon, 
Danville, Lancaster, Richmond, Morgantown, Brownsville, 
Horse Cave, Greensburg, Campbellsville, Liberty, Stanford, 
Russellville, Bowling Green, Franklin, Providence, Scottsville, 
Glasgow, Tompkinsville, Edmonton, Columbia, Jamestown, 
Burkesville, and Albany
336 AM EDT Tue Apr 20 2021 /236 AM CDT Tue Apr 20 2021/

...FREEZE WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY MORNING...

* WHAT...Sub-freezing temperatures as low as 29 possible.

* WHERE...southern Indiana and central Kentucky.

* WHEN...From late Wednesday night through Thursday morning.

* IMPACTS...Freeze conditions could kill sensitive vegetation and
  possibly damage unprotected outdoor plumbing.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

13

3 follow-up statements

944 
WWUS73 KLMK 201847
NPWLMK

URGENT - WEATHER MESSAGE
National Weather Service Louisville KY
247 PM EDT Tue Apr 20 2021

INZ076>079-083-084-089>092-KYZ032-210900-
/O.CON.KLMK.FZ.W.0004.210421T0700Z-210421T1400Z/
/O.CON.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
Orange-Washington-Scott-Jefferson-Dubois-Crawford-Perry-Harrison-
Floyd-Clark-Trimble-
Including the cities of Paoli, Salem, Scottsburg, Madison, 
Jasper, English, Tell City, Corydon, New Albany, Jeffersonville, 
Bedford, and Milton
247 PM EDT Tue Apr 20 2021 /147 PM CDT Tue Apr 20 2021/

...FREEZE WARNING REMAINS IN EFFECT FROM 3 AM EDT /2 AM CDT/ TO
10 AM EDT /9 AM CDT/ WEDNESDAY...
...FREEZE WATCH REMAINS IN EFFECT FROM LATE WEDNESDAY NIGHT
THROUGH THURSDAY MORNING...

* WHAT...Temperatures are expected to fall into the 29-32 degree 
  range late tonight into early Wednesday morning...and may do 
  so again late Wednesday night into early Thursday morning. 

* WHERE...Portions of and south central Indiana and north 
  central Kentucky for the warning tonight. All of southern 
  Indiana and central Kentucky for the watch tomorrow night. 

* WHEN...For the Freeze Warning, from 3 AM EDT /2 AM CDT/ to 10 
  AM EDT /9 AM CDT/ Wednesday. For the Freeze Watch, from late 
  Wednesday night through Thursday morning. 

* IMPACTS...Freeze conditions will kill sensitive vegetation.

* ADDITIONAL DETAILS...wind chills early Wednesday morning will 
  be in the lower and middle 20s. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

KYZ023>031-033>043-045>049-053>057-061>067-070>078-081-082-210900-
/O.CON.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
Hancock-Breckinridge-Meade-Ohio-Grayson-Hardin-Bullitt-Jefferson-
Oldham-Henry-Shelby-Franklin-Scott-Harrison-Spencer-Anderson-
Woodford-Fayette-Bourbon-Nicholas-Nelson-Washington-Mercer-
Jessamine-Clark-Larue-Marion-Boyle-Garrard-Madison-Butler-
Edmonson-Hart-Green-Taylor-Casey-Lincoln-Logan-Warren-Simpson-
Allen-Barren-Monroe-Metcalfe-Adair-Russell-Cumberland-Clinton-
Including the cities of Lewisport, Hawesville, Hardinsburg, 
Brandenburg, Hartford, Leitchfield, Elizabethtown, 
Shepherdsville, Louisville, La Grange, New Castle, Shelbyville, 
Frankfort, Georgetown, Cynthiana, Taylorsville, Lawrenceburg, 
Versailles, Lexington, Paris, Carlisle, Bardstown, Springfield, 
Harrodsburg, Nicholasville, Winchester, Hodgenville, Lebanon, 
Danville, Lancaster, Richmond, Morgantown, Brownsville, 
Horse Cave, Greensburg, Campbellsville, Liberty, Stanford, 
Russellville, Bowling Green, Franklin, Providence, Scottsville, 
Glasgow, Tompkinsville, Edmonton, Columbia, Jamestown, 
Burkesville, and Albany
247 PM EDT Tue Apr 20 2021 /147 PM CDT Tue Apr 20 2021/

...FREEZE WATCH REMAINS IN EFFECT FROM LATE WEDNESDAY NIGHT
THROUGH THURSDAY MORNING...

* WHAT...Sub-freezing temperatures as low as 29 to 31 will be  
  possible.

* WHERE...southern Indiana and central Kentucky.

* WHEN...From late Wednesday night through Thursday morning.

* IMPACTS...Freeze conditions could kill sensitive vegetation 
  and possibly damage unprotected outdoor plumbing. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

124 
WWUS73 KLMK 210752
NPWLMK

URGENT - WEATHER MESSAGE
National Weather Service Louisville KY
352 AM EDT Wed Apr 21 2021


INZ076>079-083-084-089>092-KYZ032-211500-
/O.UPG.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
/O.NEW.KLMK.FZ.W.0005.210422T0400Z-210422T1400Z/
/O.CON.KLMK.FZ.W.0004.000000T0000Z-210421T1400Z/
Orange-Washington-Scott-Jefferson-Dubois-Crawford-Perry-Harrison-
Floyd-Clark-Trimble-
Including the cities of Paoli, Salem, Scottsburg, Madison, 
Jasper, English, Tell City, Corydon, New Albany, Jeffersonville, 
Bedford, and Milton
352 AM EDT Wed Apr 21 2021 /252 AM CDT Wed Apr 21 2021/

...FREEZE WARNING REMAINS IN EFFECT UNTIL 10 AM EDT /9 AM CDT/
THIS MORNING...
...FREEZE WARNING IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/ TONIGHT
TO 10 AM EDT /9 AM CDT/ THURSDAY...

The National Weather Service in Louisville has issued a Freeze
Warning, which is in effect from midnight EDT /11 PM CDT/ tonight
to 10 AM EDT /9 AM CDT/ Thursday. The Freeze Watch is no longer
in effect. 

* WHAT...Temperatures are expected to be in the 29-32 degree range
  this morning...and will do so again late Wednesday night into 
  early Thursday morning. 

* WHERE...Portions of south central Indiana and north central
  Kentucky in the warning for this morning. All of southern
  Indiana and most of central Kentucky for the warning tonight and
  early Thursday morning.

* WHEN...Until 10 AM EDT /9 AM CDT/ This morning. Then from
  midnight EDT /11 PM CDT tonight to 10 AM EDT /9 AM CDT/ Thursday
  morning.

* Impacts...Freeze conditions will kill sensitive vegetation.

* ADDITIONAL DETAILS...wind chills this morning will be in the 
  lower and middle 20s and again Thursday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

KYZ023>025-027>031-033>043-045>049-053>057-062>067-073>078-081-
082-211500-
/O.UPG.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
/O.NEW.KLMK.FZ.W.0005.210422T0400Z-210422T1400Z/
Hancock-Breckinridge-Meade-Grayson-Hardin-Bullitt-Jefferson-
Oldham-Henry-Shelby-Franklin-Scott-Harrison-Spencer-Anderson-
Woodford-Fayette-Bourbon-Nicholas-Nelson-Washington-Mercer-
Jessamine-Clark-Larue-Marion-Boyle-Garrard-Madison-Edmonson-Hart-
Green-Taylor-Casey-Lincoln-Allen-Barren-Monroe-Metcalfe-Adair-
Russell-Cumberland-Clinton-
Including the cities of Lewisport, Hawesville, Hardinsburg, 
Brandenburg, Leitchfield, Elizabethtown, Shepherdsville, 
Louisville, La Grange, New Castle, Shelbyville, Frankfort, 
Georgetown, Cynthiana, Taylorsville, Lawrenceburg, Versailles, 
Lexington, Paris, Carlisle, Bardstown, Springfield, Harrodsburg, 
Nicholasville, Winchester, Hodgenville, Lebanon, Danville, 
Lancaster, Richmond, Brownsville, Horse Cave, Greensburg, 
Campbellsville, Liberty, Stanford, Scottsville, Glasgow, 
Tompkinsville, Edmonton, Columbia, Jamestown, Burkesville, 
and Albany
352 AM EDT Wed Apr 21 2021 /252 AM CDT Wed Apr 21 2021/

...FREEZE WARNING IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/ TONIGHT
TO 10 AM EDT /9 AM CDT/ THURSDAY...

The National Weather Service in Louisville has issued a Freeze
Warning, which is in effect from midnight EDT /11 PM CDT/ tonight
to 10 AM EDT /9 AM CDT/ Thursday. The Freeze Watch is no longer
in effect. 

* WHAT...Temperatures are expected to range from 28-32 degrees
  late tonight into early Thursday morning.
  

* WHERE...Southern Indiana and most of central Kentucky.

* WHEN...From midnight EDT /11 PM CDT tonight to 10 AM EDT /9 AM 
  CDT/ Thursday morning.

* Impacts...Freeze conditions will kill sensitive vegetation.
 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

KYZ026-061-070>072-211500-
/O.UPG.KLMK.FZ.A.0002.210422T0600Z-210422T1400Z/
/O.NEW.KLMK.FR.Y.0003.210422T0400Z-210422T1400Z/
Ohio-Butler-Logan-Warren-Simpson-
Including the cities of Hartford, Morgantown, Russellville, 
Bowling Green, Franklin, and Providence
252 AM CDT Wed Apr 21 2021

...FROST ADVISORY IN EFFECT FROM 11 PM THIS EVENING TO 9 AM CDT
THURSDAY...

The National Weather Service in Louisville has issued a Frost
Advisory, which is in effect from 11 PM this evening to 9 AM CDT
Thursday. The Freeze Watch is no longer in effect. 

* WHAT...Temperatures are expected to range from 32-35 degrees 
  late tonight into early Thursday morning. 

* WHERE...Parts of south-central Kentucky.

* WHEN...From late Wednesday night through Thursday morning.

* Impacts...Frost could damage or kill sensitive outdoor
  vegetation if left uncovered.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

A Frost Advisory means that widespread frost is expected.
Sensitive outdoor plants may be killed if left uncovered.

&&

$$
BTN

004 
WWUS73 KLMK 211403
NPWLMK

URGENT - WEATHER MESSAGE
National Weather Service Louisville KY
1003 AM EDT Wed Apr 21 2021

INZ076>079-083-084-089>092-KYZ032-212215-
/O.EXP.KLMK.FZ.W.0004.000000T0000Z-210421T1400Z/
/O.CON.KLMK.FZ.W.0005.210422T0400Z-210422T1400Z/
Orange-Washington-Scott-Jefferson-Dubois-Crawford-Perry-Harrison-
Floyd-Clark-Trimble-
Including the cities of Paoli, Salem, Scottsburg, Madison, 
Jasper, English, Tell City, Corydon, New Albany, Jeffersonville, 
Bedford, and Milton
1003 AM EDT Wed Apr 21 2021 /903 AM CDT Wed Apr 21 2021/

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/
TONIGHT TO 10 AM EDT /9 AM CDT/ THURSDAY...
...FREEZE WARNING HAS EXPIRED...

* WHAT...Sub-freezing temperatures as low as 30 expected.

* WHERE...Portions of south central Indiana and north central 
  Kentucky in the warning for this morning. All of southern 
  Indiana and most of central Kentucky for the warning tonight 
  and early Thursday morning.

* WHEN...Until 10 AM EDT /9 AM CDT/ This morning. Then from 
  midnight EDT /11 PM CDT tonight to 10 AM EDT /9 AM CDT/ 
  Thursday morning.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

* ADDITIONAL DETAILS...Wind chills this morning will be in the
  lower and middle 20s Thursday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

&&

$$

KYZ023>025-027>031-033>043-045>049-053>057-062>067-073>078-081-
082-212215-
/O.CON.KLMK.FZ.W.0005.210422T0400Z-210422T1400Z/
Hancock-Breckinridge-Meade-Grayson-Hardin-Bullitt-Jefferson-
Oldham-Henry-Shelby-Franklin-Scott-Harrison-Spencer-Anderson-
Woodford-Fayette-Bourbon-Nicholas-Nelson-Washington-Mercer-
Jessamine-Clark-Larue-Marion-Boyle-Garrard-Madison-Edmonson-Hart-
Green-Taylor-Casey-Lincoln-Allen-Barren-Monroe-Metcalfe-Adair-
Russell-Cumberland-Clinton-
Including the cities of Lewisport, Hawesville, Hardinsburg, 
Brandenburg, Leitchfield, Elizabethtown, Shepherdsville, 
Louisville, La Grange, New Castle, Shelbyville, Frankfort, 
Georgetown, Cynthiana, Taylorsville, Lawrenceburg, Versailles, 
Lexington, Paris, Carlisle, Bardstown, Springfield, Harrodsburg, 
Nicholasville, Winchester, Hodgenville, Lebanon, Danville, 
Lancaster, Richmond, Brownsville, Horse Cave, Greensburg, 
Campbellsville, Liberty, Stanford, Scottsville, Glasgow, 
Tompkinsville, Edmonton, Columbia, Jamestown, Burkesville, 
and Albany
1003 AM EDT Wed Apr 21 2021 /903 AM CDT Wed Apr 21 2021/

...FREEZE WARNING REMAINS IN EFFECT FROM MIDNIGHT EDT /11 PM CDT/
TONIGHT TO 10 AM EDT /9 AM CDT/ THURSDAY...

* WHAT...Temperatures are expected to range from 28-32 degrees 
  late tonight into early Thursday morning.

* WHERE...Southern Indiana and most of central Kentucky.

* WHEN...From midnight EDT /11 PM CDT tonight to 10 AM EDT /9 AM 
  CDT/ Thursday morning.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

* ADDITIONAL DETAILS...Wind chills this morning will be in the
  lower and middle 20s Thursday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

A Freeze Warning means sub-freezing temperatures are imminent or
highly likely. These conditions will kill crops and other
sensitive vegetation.

&&

$$

KYZ026-061-070>072-212215-
/O.CON.KLMK.FR.Y.0003.210422T0400Z-210422T1400Z/
Ohio-Butler-Logan-Warren-Simpson-
Including the cities of Hartford, Morgantown, Russellville, 
Bowling Green, Franklin, and Providence
903 AM CDT Wed Apr 21 2021

...FROST ADVISORY REMAINS IN EFFECT FROM 11 PM THIS EVENING TO
9 AM CDT THURSDAY...

* WHAT...Temperatures are expected to range from 32-35 degrees 
  late tonight into early Thursday morning.

* WHERE...Parts of south-central Kentucky.

* WHEN...From late Wednesday night through Thursday morning.

* IMPACTS...Frost and freeze conditions will kill crops, other
  sensitive vegetation and possibly damage unprotected outdoor
  plumbing.

* ADDITIONAL DETAILS...Wind chills this morning will be in the
  lower and middle 20s Thursday morning. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Take steps now to protect tender plants from the cold. To prevent
freezing and possible bursting of outdoor water pipes they should
be wrapped, drained, or allowed to drip slowly. Those that have
in-ground sprinkler systems should drain them and cover above-
ground pipes to protect them from freezing.

A Frost Advisory means that widespread frost is expected.
Sensitive outdoor plants may be killed if left uncovered.

&&

$$

CG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 3:36 AM EDT	Freeze Watch	LMK	Clark, Crawford, Dubois, Floyd, Harrison, Jefferson and 4 more	24 hr

Nearby

Freeze Warnings in Indiana, 2021 Freeze Warnings in Kentucky, 2021 Every freeze 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.