Alert archive / Kentucky / Special Weather Statements in 2021

Special Weather Statement, NWS Louisville, KY

April 21, 202127 counties in Kentucky

NWS Louisville, KY issued this special weather statement at Apr 21, 2021, 12:42 AM CDT for 27 counties in Kentucky. It was in force for 63 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 21, 2021, 12:42 AM CDT (05:42 UTC)
Expired: Apr 21, 2021, 1:45 AM CDT
In force: 63 min
Issued by: NWS Louisville, KY

All 27 counties

Allen County, KY, Anderson County, KY, Barren County, KY, Bullitt County, KY, Edmonson County, KY, Franklin County, KY, Green County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Larue County, KY, Marion County, KY, Mercer County, KY, Metcalfe County, KY, Nelson County, KY, Oldham County, KY, Scott County, KY, Shelby County, KY, Simpson County, KY, Spencer County, KY, Taylor County, KY, Trimble County, KY, Warren County, KY, Washington County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 75 km from the middle of the area, began a volume at 05:43 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, 5.7 hours before the alert went out and 180 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1362 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 368 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 20, 9:21 PM CDT, 3 hours 21 minutes earlier.

Area forecast discussion, Apr 20, 9:21 PM CDT, 3 hours 21 minutes before

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Hazardous weather outlook, Apr 20, 2:26 PM CDT, 10 hours 16 minutes before

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In the hours before

Special weather statement, Apr 21, 12:42 AM CDT, 0 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
Apr 21, 2:52 AM CDT	Frost Advisory	LMK	Butler, Logan, Ohio, Simpson, Warren	28 hr
Apr 21, 2:52 AM CDT	Freeze Warning	LMK	Adair, Allen, Anderson, Barren, Bourbon, Boyle and 38 more	28 hr
Apr 21, 1:49 PM CDT	Freeze Watch	LMK	Bourbon, Clark, Fayette, Harrison, Nicholas, Scott	14 hr

Nearby

Special Weather Statements in Kentucky, 2021 Every special weather statement 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.