Alert archive / Kentucky / Areal Flood Warnings in 2021

Areal Flood Warning 18, NWS Louisville, KY

May 4, 2021Butler County, Logan County, Kentucky

NWS Louisville, KY issued this areal flood warning at May 4, 2021, 11:36 PM CDT for Butler County, Logan County, Kentucky. It was in force for 5 hr. 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 4, 2021, 11:36 PM CDT (04:36 UTC)
Expired: May 5, 2021, 4:09 AM CDT
In force: 5 hr
Issued by: NWS Louisville, KY
Area: Storm-based polygon
Flood severity: None

Counties Butler County, KY, Logan County, KY

The radar

The Ft Campbell radar (KHPX), 56 km from the middle of the area, began a volume at 04:37 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 4.6 hours before the alert went out and 102 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: 539 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 815 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 102 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this areal flood 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 areal flood warning went out at May 4, 8:37 PM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, May 4, 8:37 PM CDT, 2 hours 59 minutes before

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Hazardous weather outlook, May 4, 9:09 PM CDT, 2 hours 27 minutes before

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In the hours before

Special weather statement, May 4, 8:08 PM CDT, 3 hours 28 minutes before

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Special weather statement, May 4, 8:14 PM CDT, 3 hours 22 minutes before

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Special weather statement, May 4, 8:29 PM CDT, 3 hours 7 minutes before

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Local storm report, May 4, 8:47 PM CDT, 2 hours 49 minutes before

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Local storm report, May 4, 8:55 PM CDT, 2 hours 41 minutes before

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Special weather statement, May 4, 9:00 PM CDT, 2 hours 36 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 4, 7:09 PM CDT	Special Weather Statement	LMK	Marion, Washington	36 min
May 4, 7:10 PM CDT	Special Weather Statement	LMK	Logan	35 min
May 4, 7:14 PM CDT	Tornado Warning	LMK	Marion, Washington	31 min
May 4, 7:20 PM CDT	Special Weather Statement	LMK	Edmonson, Warren	40 min
May 4, 7:30 PM CDT	Flash Flood Warning	LMK	Barren, Edmonson, Logan, Warren	4 hr
May 4, 7:36 PM CDT	Severe Thunderstorm Warning	LMK	Washington	24 min
May 4, 7:46 PM CDT	Special Weather Statement	LMK	Larue	29 min
May 4, 7:55 PM CDT	Special Weather Statement	LMK	Mercer	35 min
May 4, 8:02 PM CDT	Special Weather Statement	LMK	Butler	13 min
May 4, 8:08 PM CDT	Special Weather Statement	LMK	Hart	37 min
May 4, 8:14 PM CDT	Special Weather Statement	LMK	Marion	31 min
May 4, 8:18 PM CDT	Severe Thunderstorm Warning	LMK	Larue, Marion, Nelson	27 min
May 4, 8:29 PM CDT	Special Weather Statement	LMK	Jessamine	61 min
May 4, 8:45 PM CDT	Flash Flood Warning	LMK	Butler, Logan	3 hr
May 4, 9:00 PM CDT	Special Weather Statement	LMK	Logan	30 min
May 5, 6:59 AM CDT	River Flood Advisory	LMK	Hart	3 hr
May 5, 9:22 AM CDT	River Flood Advisory	LMK	Hardin, Nelson	16 hr
May 5, 10:26 AM CDT	River Flood Warning	LMK	Hart	7 hr
May 5, 3:08 PM CDT	River Flood Advisory	LMK	Bourbon	10 hr

Nearby

Areal Flood Warnings in Kentucky, 2021 Every areal flood 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.