Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 86, NWS Louisville, KY

July 10, 2021Jefferson County, Indiana; Trimble County, Kentucky

NWS Louisville, KY issued this severe thunderstorm warning at Jul 10, 2021, 8:09 PM EDT for Jefferson County, Indiana; Trimble County, Kentucky. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 10, 2021, 8:09 PM EDT (00:09 UTC)
Expired: Jul 10, 2021, 8:45 PM EDT
In force: 36 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Jefferson County, IN, Trimble County, KY

The radar

The Louisville radar (KLVX), 102 km from the middle of the area, began a volume at 00:09 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.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.2 hours before the alert went out and 151 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: 23 J/kg
Mixed-layer CIN: -108 J/kg
Mixed-layer LCL: 754 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

519 
WUUS53 KLMK 110009
SVRLMK
INC077-KYC223-110045-
/O.NEW.KLMK.SV.W.0086.210711T0009Z-210711T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Louisville KY
809 PM EDT Sat Jul 10 2021

The National Weather Service in Louisville has issued a

* Severe Thunderstorm Warning for...
  Jefferson County in south central Indiana...
  Northwestern Trimble County in central Kentucky...

* Until 845 PM EDT.

* At 809 PM EDT, a severe thunderstorm was located near Madison,
  moving northeast at 35 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Madison around 825 PM EDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3877 8520 3873 8525 3874 8527 3874 8533
      3873 8533 3869 8530 3859 8542 3868 8558
      3891 8544 3891 8520
TIME...MOT...LOC 0009Z 209DEG 28KT 3866 8545 

HAIL...<.75IN
WIND...60MPH
 
$$

RAS

1 follow-up statement

687 
WWUS53 KLMK 110035
SVSLMK

Severe Weather Statement
National Weather Service Louisville KY
835 PM EDT Sat Jul 10 2021

INC077-KYC223-110045-
/O.EXP.KLMK.SV.W.0086.000000T0000Z-210711T0045Z/
Jefferson IN-Trimble KY-
835 PM EDT Sat Jul 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR JEFFERSON AND NORTHWESTERN
TRIMBLE COUNTIES WILL EXPIRE AT 845 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 3877 8520 3873 8525 3874 8527 3874 8533
      3873 8533 3869 8530 3859 8542 3868 8558
      3891 8544 3891 8520
TIME...MOT...LOC 0035Z 209DEG 28KT 3883 8533 

$$

RAS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 10, 9:20 PM EDT	Special Weather Statement	LMK	Crawford, Perry	40 min
Jul 10, 11:03 PM EDT	Special Weather Statement	LMK	Jefferson	42 min
Jul 10, 11:43 PM EDT	Areal Flood Advisory	LMK	Clark, Floyd, Harrison	3 hr
Jul 10, 8:07 PM EDT	Areal Flood Advisory	LMK	Garrard, Madison	3 hr
Jul 10, 9:31 PM EDT	Special Weather Statement	LMK	Breckinridge	29 min
Jul 10, 10:03 PM EDT	Special Weather Statement	LMK	Breckinridge, Grayson, Meade	27 min
Jul 10, 10:08 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge	22 min
Jul 10, 10:25 PM EDT	Areal Flood Advisory	LMK	Breckinridge	7 hr
Jul 10, 10:27 PM EDT	Special Weather Statement	LMK	Hardin	33 min
Jul 10, 10:32 PM EDT	Special Weather Statement	LMK	Edmonson, Hart	43 min
Jul 10, 11:03 PM EDT	Special Weather Statement	LMK	Anderson, Franklin, Scott, Woodford	42 min
Jul 10, 11:31 PM EDT	Areal Flood Advisory	LMK	Butler	6 hr
Jul 11, 1:14 AM EDT	Flash Flood Warning	LMK	Ohio	4 hr
Jul 11, 4:00 AM EDT	Special Weather Statement	LMK	Logan	30 min
Jul 11, 4:42 AM EDT	Special Weather Statement	LMK	Simpson	33 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2021 Severe Thunderstorm Warnings in Kentucky, 2021 Every severe thunderstorm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.