Alert archive / Kentucky / Frost Advisories in 2020

Frost Advisory 1, NWS Louisville, KY

April 10, 202018 counties in Kentucky; 9 counties in Indiana

NWS Louisville, KY issued this frost advisory at Apr 10, 2020, 2:36 AM CDT for 18 counties in Kentucky; 9 counties in Indiana. It took effect at Apr 11, 2020, 2:00 AM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Apr 10, 2020, 2:36 AM CDT (07:36 UTC)
In effect from: Apr 11, 2020, 2:00 AM CDT
Expired: Apr 11, 2020, 7:59 AM CDT
In force: 6 hr
Issued by: NWS Louisville, KY

All 27 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Orange County, IN, Perry County, IN, Scott County, IN, Washington County, IN, Allen County, KY, Barren County, KY, Breckinridge County, KY, Bullitt County, KY, Butler County, KY, Edmonson County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Hart County, KY, Jefferson County, KY, Larue County, KY, Logan County, KY, Meade County, KY, Ohio County, KY, Oldham County, KY, Simpson County, KY, Warren County, KY

The radar

The Louisville radar (KLVX), 33 km from the middle of the area, began a volume at 07:40 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, 7.6 hours before the alert went out and 279 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: 1871 m above ground
0-6 km bulk shear: 109 kt
0-1 km storm-relative helicity: 37 m²/s²
0-3 km storm-relative helicity: 99 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 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 9, 6:11 PM CDT, 8 hours 25 minutes earlier.

Area forecast discussion, Apr 9, 6:11 PM CDT, 8 hours 25 minutes before

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Hazardous weather outlook, Apr 9, 2:11 PM CDT, 12 hours 25 minutes before

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</head>
<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>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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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 10, 2:36 AM CDT	Freeze Warning	LMK	Adair, Anderson, Bourbon, Boyle, Casey, Clark and 25 more	29 hr

Nearby

Frost Advisories in Kentucky, 2020 Frost Advisories in Indiana, 2020 Every frost advisory in 2020

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.