Alert archive / Indiana / Severe Thunderstorm Warnings in 2022

Severe Thunderstorm Warning 121, NWS Louisville, KY

May 20, 2022Jefferson County, Indiana

NWS Louisville, KY issued this severe thunderstorm warning at May 20, 2022, 3:52 AM EDT for Jefferson County, Indiana. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 20, 2022, 3:52 AM EDT (07:52 UTC)
Expired: May 20, 2022, 4:15 AM EDT
In force: 23 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

County Jefferson County, IN

The radar

The Louisville radar (KLVX), 100 km from the middle of the area, began a volume at 07:52 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, 7.9 hours before the alert went out and 159 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: 719 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1389 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Louisville, KY wrote its last area forecast discussion before this severe thunderstorm warning went out at May 20, 3:42 AM EDT, 10 minutes earlier.

Area forecast discussion, May 20, 3:42 AM EDT, 10 minutes before

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Hazardous weather outlook, May 20, 3:48 AM EDT, 4 minutes before

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In the hours before

Special weather statement, May 20, 1:39 AM EDT, 2 hours 13 minutes before

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Special weather statement, May 20, 2:21 AM EDT, 1 hour 31 minutes before

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Special weather statement, May 20, 2:47 AM EDT, 1 hour 5 minutes before

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Special weather statement, May 20, 3:18 AM EDT, 34 minutes before

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Special weather statement, May 20, 3:38 AM EDT, 14 minutes before

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Local storm report, May 20, 3:48 AM EDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 8:34 PM EDT	Special Weather Statement	LMK	Mercer	26 min
May 19, 8:53 PM EDT	Severe Thunderstorm Warning	LMK	Trimble	37 min
May 19, 9:02 PM EDT	Severe Thunderstorm Warning	LMK	Garrard, Jessamine, Mercer, Woodford	28 min
May 19, 9:30 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LMK	Jessamine	30 min
May 19, 9:32 PM EDT	Special Weather Statement	LMK	Shelby	28 min
May 19, 9:33 PM EDT	Special Weather Statement	LMK	Trimble	27 min
May 19, 9:44 PM EDT	Severe Thunderstorm Warning	LMK	Trimble	46 min
May 19, 9:52 PM EDT	Special Weather Statement	LMK	Clark, Fayette	83 min
May 19, 10:03 PM EDT	Severe Thunderstorm Warning	LMK	Clark, Fayette	27 min
May 19, 10:03 PM EDT	Severe Thunderstorm Warning	LMK	Franklin, Henry, Oldham, Shelby	42 min
May 19, 10:31 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LMK	Bourbon, Clark, Nicholas	29 min
May 19, 10:47 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LMK	Franklin, Henry	11 min
May 19, 11:01 PM EDT	Severe Thunderstorm Warning	LMK	Bourbon, Nicholas	14 min
May 19, 11:32 PM EDT	Severe Thunderstorm Warning	LMK	Harrison, Scott	28 min
May 19, 11:55 PM EDT	Severe Thunderstorm Warning Considerable damage threat	LMK	Harrison, Nicholas	21 min
May 20, 3:38 AM EDT	Special Weather Statement	LMK	Carroll	22 min
May 19, 8:03 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson	27 min
May 19, 8:09 PM EDT	Severe Thunderstorm Warning	LMK	Orange, Washington	51 min
May 19, 8:29 PM EDT	Severe Thunderstorm Warning	LMK	Jefferson, Scott	31 min
May 19, 8:35 PM EDT	Special Weather Statement	LMK	Orange	25 min
May 19, 8:58 PM EDT	Severe Thunderstorm Warning	LMK	Washington	32 min
May 19, 9:16 PM EDT	Special Weather Statement	LMK	Scott	29 min
May 19, 11:22 PM EDT	Special Weather Statement	LMK	Dubois	23 min
May 19, 11:34 PM EDT	Severe Thunderstorm Warning	LMK	Dubois	26 min
May 19, 11:58 PM EDT	Severe Thunderstorm Warning	LMK	Crawford, Dubois, Orange	32 min
May 20, 12:27 AM EDT	Severe Thunderstorm Warning	LMK	Washington	33 min
May 20, 1:02 AM EDT	Special Weather Statement	LMK	Scott	28 min
May 20, 1:39 AM EDT	Special Weather Statement	LMK	Orange	36 min
May 20, 1:57 AM EDT	Severe Thunderstorm Warning	LMK	Orange	33 min
May 20, 2:21 AM EDT	Special Weather Statement	LMK	Washington	24 min
May 20, 2:47 AM EDT	Special Weather Statement	LMK	Jefferson, Scott	28 min
May 20, 3:18 AM EDT	Special Weather Statement	LMK	Jefferson	27 min
May 20, 4:02 AM EDT	Areal Flood Advisory	LMK	Jefferson	118 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2022 Every severe thunderstorm warning in 2022

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.