Alert archive / Kentucky / Flash Flood Watches in 2020

Flash Flood Watch 3, NWS Louisville, KY

March 12, 202031 counties in Kentucky; 8 counties in Indiana

NWS Louisville, KY issued this flash flood watch at Mar 12, 2020, 10:57 AM EDT for 31 counties in Kentucky; 8 counties in Indiana. It took effect at Mar 12, 2020, 5:00 PM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Mar 12, 2020, 10:57 AM EDT (14:57 UTC)
In effect from: Mar 12, 2020, 5:00 PM EDT
Expired: Mar 13, 2020, 2:00 AM EDT
In force: 9 hr
Issued by: NWS Louisville, KY
Flood severity: None

All 39 counties

Clark County, IN, Crawford County, IN, Dubois County, IN, Floyd County, IN, Harrison County, IN, Orange County, IN, Perry County, IN, Washington County, IN, Anderson County, KY, Bourbon County, KY, Boyle County, KY, Breckinridge County, KY, Bullitt County, KY, Clark County, KY, Fayette County, KY, Franklin County, KY, Garrard County, KY, Grayson County, KY, Hancock County, KY, Hardin County, KY, Harrison County, KY, Henry County, KY, Jefferson County, KY, Jessamine County, KY, Larue County, KY, Madison County, KY, Marion County, KY, Meade County, KY, Mercer County, KY, Nelson County, KY, Nicholas County, KY, Ohio County, KY, Oldham County, KY, Scott County, KY, Shelby County, KY, Spencer County, KY, Trimble County, KY, Washington County, KY, Woodford County, KY

The radar

The Louisville radar (KLVX), 46 km from the middle of the area, began a volume at 14:54 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 12:00Z, 3.0 hours before the alert went out and 209 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: 869 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 116 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 flash flood watch 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 flash flood watch went out at Mar 12, 8:45 AM EDT, 2 hours 12 minutes earlier.

Area forecast discussion, Mar 12, 8:45 AM EDT, 2 hours 12 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Hazardous weather outlook, Mar 12, 3:54 AM EDT, 7 hours 3 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</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.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

Everything else NWS Louisville, KY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Mar 12, 4:37 PM EDT	Special Weather Statement	LMK	Logan, Simpson	23 min
Mar 12, 4:50 PM EDT	Special Weather Statement	LMK	Butler	40 min
Mar 12, 5:01 PM EDT	Severe Thunderstorm Warning	LMK	Butler	29 min
Mar 12, 5:04 PM EDT	Special Weather Statement	LMK	Allen, Simpson	26 min
Mar 12, 5:12 PM EDT	Special Weather Statement	LMK	Hancock	48 min
Mar 12, 5:28 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Grayson	32 min
Mar 12, 5:33 PM EDT	Tornado Warning	LMK	Butler, Edmonson, Grayson	27 min
Mar 12, 5:54 PM EDT	Special Weather Statement	LMK	Grayson	36 min
Mar 12, 5:57 PM EDT	Severe Thunderstorm Warning	LMK	Breckinridge, Grayson, Hancock, Hardin, Ohio	33 min
Mar 12, 5:58 PM EDT	Tornado Warning	LMK	Edmonson, Hart	32 min
Mar 12, 5:59 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Ohio	46 min
Mar 12, 6:27 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Warren	59 min
Mar 12, 6:31 PM EDT	Severe Thunderstorm Warning	LMK	Grayson, Hardin, Hart, Larue	29 min
Mar 12, 6:34 PM EDT	Flash Flood Warning	LMK	Grayson, Hardin	3 hr
Mar 12, 6:34 PM EDT	Special Weather Statement	LMK	Breckinridge, Hancock	26 min
Mar 12, 6:41 PM EDT	Flash Flood Warning	LMK	Butler, Ohio	3 hr
Mar 12, 6:43 PM EDT	Severe Thunderstorm Warning	LMK	Green, Hart, Taylor	47 min
Mar 12, 6:59 PM EDT	Flash Flood Warning	LMK	Hart	3 hr
Mar 12, 7:03 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Ohio, Warren	27 min
Mar 12, 7:05 PM EDT	Severe Thunderstorm Warning	LMK	Barren	38 min
Mar 12, 7:16 PM EDT	Flash Flood Warning	LMK	Green, Taylor	3 hr
Mar 12, 7:21 PM EDT	Flash Flood Warning	LMK	Barren, Edmonson, Hart, Warren	3 hr
Mar 12, 7:24 PM EDT	Severe Thunderstorm Warning	LMK	Butler, Edmonson, Warren	36 min
Mar 12, 7:27 PM EDT	Severe Thunderstorm Warning	LMK	Adair, Casey, Green, Taylor	33 min
Mar 12, 7:40 PM EDT	Special Weather Statement	LMK	Adair, Metcalfe	35 min
Mar 12, 7:45 PM EDT	Severe Thunderstorm Warning	LMK	Barren, Edmonson, Warren	45 min
Mar 12, 7:52 PM EDT	Flash Flood Warning	LMK	Larue	2 hr
Mar 12, 7:59 PM EDT	Tornado Warning	LMK	Adair, Casey, Taylor	31 min

Nearby

Flash Flood Watches in Kentucky, 2020 Flash Flood Watches in Indiana, 2020 Every flash flood watch 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.