Alert archive / Tennessee / Flash Flood Warnings in 2023

Flash Flood Warning 41, NWS Morristown, TN

August 15, 2023Blount County, Monroe County, Tennessee

NWS Morristown, TN issued this flash flood warning at Aug 15, 2023, 3:21 AM EDT for Blount County, Monroe County, Tennessee. It was in force for 98 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 15, 2023, 3:21 AM EDT (07:21 UTC)
Expired: Aug 15, 2023, 4:59 AM EDT
In force: 98 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Blount County, TN, Monroe County, TN

The radar

The Knoxville radar (KMRX), 91 km from the middle of the area, began a volume at 07:24 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, 7.4 hours before the alert went out and 235 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: 636 J/kg
Mixed-layer CIN: -38 J/kg
Mixed-layer LCL: 1097 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Morristown, TN wrote its last area forecast discussion before this flash flood warning went out at Aug 15, 3:00 AM EDT, 21 minutes earlier.

Area forecast discussion, Aug 15, 3:00 AM EDT, 21 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, Aug 15, 3:05 AM EDT, 16 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>

In the hours before

Local storm report, Aug 15, 1:51 AM EDT, 1 hour 30 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>

Local storm report, Aug 15, 1:53 AM EDT, 1 hour 28 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>

Special weather statement, Aug 15, 1:58 AM EDT, 1 hour 23 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>

Local storm report, Aug 15, 2:05 AM EDT, 1 hour 16 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>

Special weather statement, Aug 15, 2:38 AM EDT, 43 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>

Special weather statement, Aug 15, 2:56 AM EDT, 25 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 Morristown, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 14, 8:00 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Union	45 min
Aug 14, 8:18 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, Hamilton, McMinn, Meigs, Rhea	42 min
Aug 14, 8:31 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Jefferson, Knox, Sevier, Union	44 min
Aug 14, 8:45 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox, Loudon	60 min
Aug 14, 8:56 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock, Hawkins	49 min
Aug 14, 8:58 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Greene, Hamblen, Jefferson	47 min
Aug 14, 8:59 PM EDT	Severe Thunderstorm Warning	MRX	Bradley, McMinn, Meigs, Monroe, Polk	46 min
Aug 14, 9:03 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Jefferson	42 min
Aug 14, 9:12 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Hancock	25 min
Aug 14, 9:21 PM EDT	Areal Flood Advisory	MRX	Anderson, Grainger, Jefferson, Knox, Union	11 min
Aug 14, 9:27 PM EDT	Severe Thunderstorm Warning	MRX	Hawkins, Sullivan	48 min
Aug 14, 9:32 PM EDT	Flash Flood Warning	MRX	Anderson, Grainger, Jefferson, Knox, Union	3 hr
Aug 14, 9:34 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hancock, Hawkins	41 min
Aug 14, 9:38 PM EDT	Tornado Warning	MRX	Hawkins	52 min
Aug 14, 9:42 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Hamblen, Hawkins, Jefferson	29 min
Aug 14, 9:44 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe, Polk	46 min
Aug 14, 9:45 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hawkins, Sullivan, Washington	45 min
Aug 14, 9:50 PM EDT	Tornado Warning	MRX	Greene, Hawkins, Sullivan, Washington	40 min
Aug 14, 10:09 PM EDT	Tornado Warning	MRX	Carter, Sullivan, Washington	51 min
Aug 14, 10:10 PM EDT	Flash Flood Warning	MRX	Hancock, Hawkins	4 hr
Aug 14, 10:32 PM EDT	Severe Thunderstorm Warning	MRX	McMinn, Monroe	43 min
Aug 14, 10:38 PM EDT	Flash Flood Warning	MRX	McMinn, Meigs, Polk	5 hr
Aug 14, 10:42 PM EDT	Tornado Warning	MRX	Carter, Johnson, Sullivan	63 min
Aug 14, 10:46 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Morgan, Roane	44 min
Aug 14, 10:53 PM EDT	Special Weather Statement	MRX	Monroe	52 min
Aug 14, 11:17 PM EDT	Flash Flood Warning	MRX	McMinn, Monroe	6 hr
Aug 14, 11:23 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Grainger, Greene, Hamblen, Hawkins, Jefferson	52 min
Aug 14, 11:35 PM EDT	Special Weather Statement	MRX	McMinn, Monroe	40 min
Aug 14, 11:54 PM EDT	Flash Flood Warning	MRX	Monroe	5 hr
Aug 14, 11:56 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Cocke, Greene, Hawkins, Johnson, Unicoi and 1 more	64 min
Aug 15, 12:12 AM EDT	Flash Flood Warning	MRX	Cocke, Greene, Hamblen, Jefferson	5 hr
Aug 15, 12:16 AM EDT	Special Weather Statement	MRX	Monroe	29 min
Aug 15, 12:52 AM EDT	Tornado Warning	MRX	Carter, Johnson	16 min
Aug 15, 1:17 AM EDT	Flash Flood Warning	MRX	Monroe	4 hr
Aug 15, 1:20 AM EDT	Special Weather Statement	MRX	Bledsoe, Rhea, Sequatchie	40 min
Aug 15, 1:35 AM EDT	Severe Thunderstorm Warning	MRX	Bledsoe, Hamilton, Marion, Sequatchie	40 min
Aug 15, 1:50 AM EDT	Severe Thunderstorm Warning	MRX	Hamilton, Marion	25 min
Aug 15, 1:58 AM EDT	Special Weather Statement	MRX	Loudon, Meigs	47 min
Aug 15, 2:38 AM EDT	Special Weather Statement	MRX	Polk	52 min
Aug 15, 2:56 AM EDT	Special Weather Statement	MRX	Monroe	34 min
Aug 15, 3:16 AM EDT	Areal Flood Advisory	MRX	Carter, Cocke, Greene, Hamblen, Hawkins, Jefferson and 3 more	7 hr
Aug 15, 3:25 AM EDT	Areal Flood Advisory	MRX	Blount, Cocke, Knox, Loudon, McMinn, Monroe and 1 more	7 hr
Aug 15, 3:39 AM EDT	Areal Flood Advisory	MRX	McMinn, Meigs, Polk	4 hr
Aug 15, 4:57 AM EDT	Areal Flood Warning	MRX	Cocke, Greene, Hamblen, Jefferson	2 hr
Aug 15, 4:59 AM EDT	Areal Flood Warning	MRX	Blount, Monroe	6 hr
Aug 15, 5:04 AM EDT	Areal Flood Advisory	MRX	Monroe	116 min
Aug 15, 5:07 AM EDT	Areal Flood Warning	MRX	McMinn, Monroe	6 hr
Aug 15, 5:09 AM EDT	Areal Flood Warning	MRX	Monroe	6 hr
Aug 14, 11:55 PM EDT	Special Weather Statement	MRX	Cherokee	35 min
Aug 15, 12:45 AM EDT	Special Weather Statement	MRX	Clay	30 min
Aug 15, 12:50 AM EDT	Special Weather Statement	MRX	Cherokee, Clay	40 min
Aug 15, 3:31 AM EDT	Special Weather Statement	MRX	Cherokee, Clay	44 min
Aug 15, 4:11 AM EDT	Flash Flood Warning	MRX	Cherokee, Clay	81 min
Aug 15, 4:11 AM EDT	Special Weather Statement	MRX	Clay	19 min
Aug 15, 5:32 AM EDT	Areal Flood Advisory	MRX	Cherokee, Clay	103 min

Nearby

Flash Flood Warnings in Tennessee, 2023 Every flash flood warning in 2023

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.