Alert archive / Indiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 21, NWS Louisville, KY

April 7, 2021Clark County, Floyd County, Indiana; Jefferson County, Kentucky

NWS Louisville, KY issued this severe thunderstorm warning at Apr 7, 2021, 6:21 PM EDT for Clark County, Floyd County, Indiana; Jefferson County, Kentucky. It was in force for 24 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: Apr 7, 2021, 6:21 PM EDT (22:21 UTC)
Expired: Apr 7, 2021, 6:45 PM EDT
In force: 24 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clark County, IN, Floyd County, IN, Jefferson County, KY

The radar

The Louisville radar (KLVX), 26 km from the middle of the area, began a volume at 22:22 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 12:00Z, 10.4 hours before the alert went out and 223 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: 7 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1834 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 22 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

007 
WUUS53 KLMK 072221
SVRLMK
INC019-043-KYC111-072245-
/O.NEW.KLMK.SV.W.0021.210407T2221Z-210407T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Louisville KY
621 PM EDT Wed Apr 7 2021

The National Weather Service in Louisville has issued a

* Severe Thunderstorm Warning for...
  South central Clark County in south central Indiana...
  Southeastern Floyd County in south central Indiana...
  Northwestern Jefferson County in central Kentucky...

* Until 645 PM EDT.

* At 620 PM EDT, a severe thunderstorm was located over St. Dennis,
  moving northeast at 30 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Louisville, Jeffersonville, New Albany, St. Matthews, Shively,
  Lyndon, Graymoor-Devondale, Windy Hills, Audubon Park and Beechwood
  Village.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Report severe weather to local law enforcement, post your report to
the National Weather Service Louisville Facebook page, or tweet your
report using hashtag L, M, K, spotter.

&&

LAT...LON 3805 8588 3814 8591 3837 8580 3829 8556
TIME...MOT...LOC 2220Z 209DEG 25KT 3818 8584 

HAIL...0.75IN
WIND...60MPH
 
$$

RJS

1 follow-up statement

855 
WWUS53 KLMK 072241
SVSLMK

Severe Weather Statement
National Weather Service Louisville KY
641 PM EDT Wed Apr 7 2021

INC019-043-KYC111-072250-
/O.EXP.KLMK.SV.W.0021.000000T0000Z-210407T2245Z/
Clark IN-Floyd IN-Jefferson KY-
641 PM EDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CLARK...
SOUTHEASTERN FLOYD AND NORTHWESTERN JEFFERSON COUNTIES WILL EXPIRE AT
645 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.

Report severe weather to local law enforcement, post your report to
the National Weather Service Louisville  Facebook page, or tweet your
report using hashtag L, M, K, spotter.

LAT...LON 3805 8588 3814 8591 3837 8580 3829 8556
TIME...MOT...LOC 2240Z 209DEG 25KT 3828 8577 

$$

RJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 3:25 PM EDT	Special Weather Statement	LMK	Dubois, Perry	35 min
Apr 7, 3:56 PM EDT	Special Weather Statement	LMK	Orange	34 min
Apr 7, 4:37 PM EDT	Special Weather Statement	LMK	Harrison	38 min
Apr 7, 5:25 PM EDT	Special Weather Statement	LMK	Perry	35 min
Apr 7, 5:39 PM EDT	Special Weather Statement	LMK	Floyd	36 min
Apr 7, 3:53 PM EDT	Special Weather Statement	LMK	Grayson	37 min
Apr 7, 6:05 PM EDT	Special Weather Statement	LMK	Jefferson	40 min
Apr 7, 6:11 PM EDT	Special Weather Statement	LMK	Bullitt, Hardin	34 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.