Alert archive / Kentucky / Frost Advisories in 2017

Frost Advisory 1, NWS Louisville, KY

April 7, 201749 counties in Kentucky; 10 counties in Indiana

NWS Louisville, KY issued this frost advisory at Apr 7, 2017, 2:40 AM CDT for 49 counties in Kentucky; 10 counties in Indiana. It took effect at Apr 7, 2017, 11:00 PM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Apr 7, 2017, 2:40 AM CDT (07:40 UTC)
In effect from: Apr 7, 2017, 11:00 PM CDT
Expired: Apr 8, 2017, 7:51 AM CDT
In force: 9 hr
Issued by: NWS Louisville, KY

All 59 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Jefferson County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Washington County, IN, Adair County, KY, Allen County, KY, Anderson County, KY, Barren County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge 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, Hancock County, KY, Hardin County, KY, Harrison County, KY, Hart County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Lincoln County, KY, Logan County, KY, Madison County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Metcalfe County, KY, Monroe County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham 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), 43 km from the middle of the area, began a volume at 07:44 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, 7.7 hours before the alert went out and 205 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: 11 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 2278 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 158 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this frost advisory 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 frost advisory went out at Apr 7, 2:17 AM CDT, 23 minutes earlier.

Area forecast discussion, Apr 7, 2:17 AM CDT, 23 minutes before

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Hazardous weather outlook, Apr 6, 9:14 PM CDT, 5 hours 26 minutes before

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In the hours before

Special weather statement, Apr 6, 10:47 PM CDT, 3 hours 53 minutes before

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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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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 6, 10:47 PM CDT	Special Weather Statement	LMK	Bullitt	28 min
Apr 7, 1:33 PM CDT	Freeze Warning	LMK	Adair, Anderson, Bourbon, Boyle, Casey, Clark and 16 more	18 hr

Nearby

Frost Advisories in Kentucky, 2017 Frost Advisories in Indiana, 2017 Every frost advisory in 2017

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.