Alert archive / Kentucky / Freeze Warnings in 2018

Freeze Warning 7, NWS Louisville, KY

October 21, 201843 counties in Kentucky; Jefferson County, Indiana

NWS Louisville, KY issued this freeze warning at Oct 21, 2018, 2:29 AM CDT for 43 counties in Kentucky; Jefferson County, Indiana. It took effect at Oct 22, 2018, 1:00 AM CDT. It was in force for 7 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: Oct 21, 2018, 2:29 AM CDT (07:29 UTC)
In effect from: Oct 22, 2018, 1:00 AM CDT
Expired: Oct 22, 2018, 8:00 AM CDT
In force: 7 hr
Issued by: NWS Louisville, KY

All 44 counties

Jefferson County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bourbon County, KY, Boyle County, KY, Bullitt County, KY, Butler County, KY, Casey County, KY, Clark County, KY, Clinton County, KY, Cumberland County, KY, Edmonson County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Green County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jessamine County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Nicholas County, KY, Russell 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), 70 km from the middle of the area, began a volume at 07:31 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, 7.5 hours before the alert went out and 201 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: 1854 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: -9 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze 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 freeze warning went out at Oct 21, 2:27 AM CDT, 2 minutes earlier.

Area forecast discussion, Oct 21, 2:27 AM CDT, 2 minutes before

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Hazardous weather outlook, Oct 20, 10:24 PM CDT, 4 hours 5 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
Oct 21, 2:14 PM CDT	Frost Advisory	LMK	Breckinridge, Hancock, Jefferson, Meade, Ohio, Oldham	18 hr

Nearby

Freeze Warnings in Kentucky, 2018 Freeze Warnings in Indiana, 2018 Every freeze warning in 2018

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.