Alert archive / Tennessee / Mesoscale Discussions in 2005

Mesoscale Discussion 933

May 20, 20055 counties in North Carolina; 16 counties in Tennessee

The Storm Prediction Center issued this mesoscale discussion at May 20, 2005, 3:45 PM EDT for 5 counties in North Carolina; 16 counties in Tennessee. It was in force for 60 min.

The area

The outline as issued.

The facts

Issued
May 20, 2005, 3:45 PM EDT (19:45 UTC)
Expired
May 20, 2005, 4:45 PM EDT
In force
60 min
Issued by
the Storm Prediction Center
All 21 counties

Cherokee County, NC, Clay County, NC, Graham County, NC, Macon County, NC, Swain County, NC, Bledsoe County, TN, Blount County, TN, Bradley County, TN, Cumberland County, TN, Grundy County, TN, Hamilton County, TN, Loudon County, TN, McMinn County, TN, Meigs County, TN, Monroe County, TN, Polk County, TN, Rhea County, TN, Roane County, TN, Sequatchie County, TN, Sevier County, TN, Van Buren County, TN

The radar

The Knoxville radar (KMRX), 120 km from the middle of the area, began a volume at 19:45 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

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.8 hours before the alert went out and 244 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-pSkew-T log-p diagram, Peachtre/Fal Fld, GA at 12:00Z on 2005-05-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 580 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Peachtre/Fal Fld, GA at 12:00Z on 2005-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 53 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
580 J/kg
Mixed-layer CIN
-82 J/kg
Mixed-layer LCL
1118 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
53 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

<!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>

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 12:56 AM EDTMesoscale DiscussionSPCAlamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 39 more2 hr
May 20, 12:58 AM EDTMesoscale DiscussionSPCAlamance, Alexander, Alleghany, Ashe, Avery, Buncombe and 39 more2 hr
May 20, 2:00 AM EDTSevere Thunderstorm WatchSPCAlamance, Alexander, Alleghany, Anson, Ashe, Avery and 33 more7 hr
May 20, 2:30 AM EDTSevere Thunderstorm WatchSPCBuncombe, Cherokee, Clay, Graham, Haywood, Henderson and 5 more8 hr
May 20, 5:18 AM EDTMesoscale DiscussionSPCCherokee, Clay, Graham, Jackson, Macon, Swain and 1 more57 min
May 20, 8:42 AM EDTMesoscale DiscussionSPCCherokee, Clay, Graham, Macon93 min
May 20, 4:40 PM EDTMesoscale DiscussionSPCBrunswick, Columbus, New Hanover95 min
May 19, 9:31 PM EDTMesoscale DiscussionSPCClaiborne, Clay, Fentress, Hancock, Jackson, Macon and 7 more89 min
May 19, 9:50 PM EDTSevere Thunderstorm WatchSPCCheatham, Davidson, Dickson, Henry, Houston, Montgomery and 3 more5 hr
May 19, 10:05 PM EDTSevere Thunderstorm WatchSPCAnderson, Campbell, Carter, Claiborne, Clay, Davidson and 21 more5 hr
May 20, 9:40 AM EDTSevere Thunderstorm WatchSPCFranklin, Giles, Lawrence, Lewis, Lincoln, Marshall and 4 more7 hr
May 20, 1:55 PM EDTMesoscale DiscussionSPCFranklin, Giles, Lawrence, Lewis, Lincoln, Marshall and 4 more65 min

Nearby

Mesoscale Discussions in Tennessee, 2005Mesoscale Discussions in North Carolina, 2005Every mesoscale discussion in 2005

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.