Alert archive / Kentucky / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 104, NWS Louisville, KY

May 9, 20234 counties in Kentucky

NWS Louisville, KY issued this severe thunderstorm warning at May 9, 2023, 3:53 AM EDT for 4 counties in Kentucky. It was in force for 37 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 9, 2023, 3:53 AM EDT (07:53 UTC)
Expired: May 9, 2023, 4:30 AM EDT
In force: 37 min
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Bullitt County, KY, Jefferson County, KY, Shelby County, KY, Spencer County, KY

The radar

The Louisville radar (KLVX), 44 km from the middle of the area, began a volume at 07:53 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

Nashville Metro, TN (KBNA), launched 00:00Z, 7.9 hours before the alert went out and 241 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: 1471 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1018 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 9.3

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 9, 2:56 AM EDT, 57 minutes earlier.

Area forecast discussion, May 9, 2:56 AM EDT, 57 minutes before

Area Forecast Discussion
National Weather Service Louisville KY
256 AM EDT Tue May 9 2023

.Short Term...(Today and tonight)
Issued at 238 AM EDT Tue May 9 2023

A cold front will exit southern Kentucky early this morning, pushing
any lingering showers and storms out of the state. Low level
moisture manifesting itself in low clouds from Illinois to Ohio
overnight will move southward into the Ohio Valley this morning,
gradually lifting and scattering this afternoon. With a north breeze
and falling dew points, it should feel quite pleasant outside with
afternoon highs in the 70s.

Tonight high pressure will build southward from the Great Lakes and
supply us with mostly clear skies and a light northeast breeze.
Temperatures will tumble into the lower 50s and upper 40s. There may
be some fog development right along rivers and streams in the more
sheltered valleys, but dry air and a light but steady northeast
breeze should prevent widespread fog.

&&

.Long Term...(Wednesday through Monday)
Issued at 256 AM EDT Tue May 9 2023

Wednesday and Wednesday night high pressure over the Great Lakes
will slide southeastward to the East Coast, keeping our weather dry.
Went a bit below guidance for dew points Wednesday afternoon with
good mixing. As we get into the late week, return flow will set up
with increasing warmth and moisture along with chances of
showers/storms, especially during the afternoon and evening hours
each day. This weekend a cold front will approach from the west,
further supporting the idea of scattered shower/storm chances. Could
see some briefly strong pulsers, especially Friday and Saturday, in
very unstable but weakly sheared atmosphere. Afternoon highs will be
in the 80s with morning lows only in the 60s.

&&

.Aviation...(06Z TAF Issuance)
Issued at 125 AM EDT Tue May 9 2023

A cold front stretched out along the Ohio River will advance
southward to the Tennessee line during the pre-dawn hours, gradually
pushing showers and storms south. Low clouds, some of which have
already developed from northern Illinois to northern Ohio, will fill
in behind the front for several hours this morning before lifting to
VFR this afternoon and possibly scattering out. Tonight high
pressure expanding from the Great Lakes into the Ohio Valley will
provide aviators with clear skies and a light northeast breeze.

&&

.LMK WATCHES/WARNINGS/ADVISORIES...
IN...None.
KY...None.
&&

Short Term...13
Long Term...13
Aviation...13

Hazardous weather outlook, May 9, 3:13 AM EDT, 40 minutes before

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In the hours before

Special weather statement, May 9, 2:39 AM EDT, 1 hour 14 minutes before

Special Weather Statement
National Weather Service Louisville KY
239 AM EDT Tue May 9 2023

INZ084-090-KYZ025-090715-
Crawford IN-Harrison IN-Meade KY-
239 AM EDT Tue May 9 2023

...A strong thunderstorm will impact portions of southern Harrison,
southeastern Crawford and central Meade Counties through 315 AM
EDT...

At 238 AM EDT, Doppler radar was tracking a strong thunderstorm 10
miles south of Carefree Town, moving east at 30 mph.

HAZARD...Penny size hail.

SOURCE...Radar indicated.

IMPACT...Minor damage to outdoor objects is possible.

Locations impacted include...
  Brandenburg.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3802 8643 3819 8643 3823 8600 3796 8600
TIME...MOT...LOC 0638Z 269DEG 25KT 3810 8637

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...<30 MPH

ALL

Special weather statement, May 9, 3:01 AM EDT, 52 minutes before

Special Weather Statement
National Weather Service Louisville KY
201 AM CDT Tue May 9 2023

KYZ073-075-090730-
Monroe KY-Allen KY-
201 AM CDT Tue May 9 2023

...A strong thunderstorm will impact portions of southwestern Monroe
and southeastern Allen Counties through 230 AM CDT...

At 201 AM CDT, Doppler radar was tracking a strong thunderstorm 9
miles north of Lafayette, moving east at 25 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of southwestern Monroe
and southeastern Allen Counties, including the following locations...
Akersville, Bugtussle and Amos.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3664 8614 3668 8613 3667 8583 3662 8584
TIME...MOT...LOC 0701Z 280DEG 20KT 3665 8608

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

BJS

Local storm report, May 9, 3:21 AM EDT, 32 minutes before

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Local storm report, May 9, 3:34 AM EDT, 19 minutes before

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Local storm report, May 9, 3:36 AM EDT, 17 minutes before

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Local storm report, May 9, 3:46 AM EDT, 7 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 8, 8:00 PM EDT	Areal Flood Advisory	LMK	Ohio	7 hr
May 8, 8:28 PM EDT	Special Weather Statement	LMK	Butler	47 min
May 8, 10:54 PM EDT	Special Weather Statement	LMK	Ohio	36 min
May 8, 11:19 PM EDT	Special Weather Statement	LMK	Grayson	26 min
May 8, 11:19 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Logan	26 min
May 8, 11:43 PM EDT	Special Weather Statement	LMK	Butler	32 min
May 8, 11:54 PM EDT	Severe Thunderstorm Warning	LMK	Logan	51 min
May 8, 11:59 PM EDT	Special Weather Statement	LMK	Hardin, Larue	31 min
May 9, 12:13 AM EDT	River Flood Advisory	LMK	Warren	6 hr
May 9, 12:18 AM EDT	Areal Flood Advisory	LMK	Logan	4 hr
May 9, 12:38 AM EDT	Flash Flood Warning	LMK	Logan	4 hr
May 9, 12:54 AM EDT	Special Weather Statement	LMK	Butler	51 min
May 9, 12:57 AM EDT	Special Weather Statement	LMK	Hancock	33 min
May 9, 1:27 AM EDT	Special Weather Statement	LMK	Logan, Simpson	48 min
May 9, 1:44 AM EDT	Flash Flood Warning	LMK	Logan	4 hr
May 9, 2:13 AM EDT	Special Weather Statement	LMK	Logan	62 min
May 9, 2:21 AM EDT	Flash Flood Warning	LMK	Ohio	3 hr
May 9, 3:03 AM EDT	Severe Thunderstorm Warning	LMK	Jefferson	27 min
May 9, 3:29 AM EDT	Severe Thunderstorm Warning	LMK	Bullitt, Jefferson	31 min
May 9, 4:18 AM EDT	Severe Thunderstorm Warning	LMK	Shelby, Spencer	27 min
May 9, 4:47 AM EDT	Areal Flood Warning	LMK	Logan	3 hr
May 9, 4:47 AM EDT	Special Weather Statement	LMK	Franklin, Woodford	28 min
May 9, 5:03 AM EDT	Severe Thunderstorm Warning	LMK	Jefferson	27 min
May 9, 5:27 AM EDT	Special Weather Statement	LMK	Jefferson	33 min
May 9, 5:37 AM EDT	Areal Flood Warning	LMK	Logan	3 hr
May 9, 2:39 AM EDT	Special Weather Statement	LMK	Harrison	36 min
May 9, 4:25 AM EDT	Special Weather Statement	LMK	Harrison	35 min
May 9, 4:55 AM EDT	Special Weather Statement	LMK	Floyd, Harrison	35 min

Nearby

Severe Thunderstorm Warnings in Kentucky, 2023 Every severe thunderstorm warning in 2023

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.