Alert archive / Tennessee / Special Weather Statements in 2020

Special Weather Statement, NWS Nashville, TN

July 20, 2020Jackson County, Tennessee

NWS Nashville, TN issued this special weather statement at Jul 20, 2020, 1:24 PM CDT for Jackson County, Tennessee. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 20, 2020, 1:24 PM CDT (18:24 UTC)
Expired: Jul 20, 2020, 2:00 PM CDT
In force: 36 min
Issued by: NWS Nashville, TN

County Jackson County, TN

The radar

The Nashville radar (KOHX), 83 km from the middle of the area, began a volume at 18:26 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 12:00Z, 6.4 hours before the alert went out and 90 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: 1474 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 1142 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

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

NWS Nashville, TN wrote its last area forecast discussion before this special weather statement went out at Jul 20, 12:27 PM CDT, 57 minutes earlier.

Area forecast discussion, Jul 20, 12:27 PM CDT, 57 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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Hazardous weather outlook, Jul 20, 5:06 AM CDT, 8 hours 18 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
506 AM CDT Mon Jul 20 2020

TNZ005>011-023>034-056>066-075-077>080-093>095-211015-
Stewart-Montgomery-Robertson-Sumner-Macon-Clay-Pickett-Houston-
Humphreys-Dickson-Cheatham-Davidson-Wilson-Trousdale-Smith-Jackson-
Putnam-Overton-Fentress-Perry-Hickman-Lewis-Williamson-Maury-
Marshall-Rutherford-Cannon-De Kalb-White-Cumberland-Bedford-Coffee-
Warren-Grundy-Van Buren-Wayne-Lawrence-Giles-
506 AM CDT Mon Jul 20 2020

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

Strong thunderstorms will be possible across most of Middle TN this
afternoon and into the early evening hours. Winds of 40 to 50 mph
will be the main concern in a few of these storms, along with locally
heavy rainfall.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

27

In the hours before

Special weather statement, Jul 20, 1:24 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
124 PM CDT Mon Jul 20 2020

TNZ031-201900-
Jackson TN-
124 PM CDT Mon Jul 20 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN JACKSON COUNTY UNTIL
200 PM CDT...

At 124 PM CDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Gainesboro, moving east at 15 mph.

Pea size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Gainesboro and Whitleyville.

LAT...LON 3647 8557 3640 8550 3633 8550 3634 8583
      3647 8582 3648 8582 3650 8575
TIME...MOT...LOC 1824Z 250DEG 12KT 3640 8577

Shamburger

The office that day

Everything else NWS Nashville, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 20, 2:22 PM CDT	Areal Flood Advisory	OHX	Jackson	68 min
Jul 20, 4:24 PM CDT	Special Weather Statement	OHX	Jackson	21 min
Jul 20, 4:39 PM CDT	Areal Flood Advisory	OHX	Jackson	2 hr
Jul 20, 4:55 PM CDT	Special Weather Statement	OHX	Trousdale	50 min
Jul 20, 5:37 PM CDT	Special Weather Statement	OHX	Montgomery	23 min
Jul 20, 5:56 PM CDT	Special Weather Statement	OHX	Trousdale	49 min
Jul 20, 6:02 PM CDT	Special Weather Statement	OHX	Montgomery	28 min
Jul 20, 6:10 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Wilson	35 min
Jul 20, 6:25 PM CDT	Areal Flood Advisory	OHX	Sumner, Wilson	2 hr
Jul 20, 6:41 PM CDT	Severe Thunderstorm Warning	OHX	Sumner, Wilson	34 min
Jul 20, 6:55 PM CDT	Flash Flood Warning	OHX	Sumner, Wilson	2 hr

Nearby

Special Weather Statements in Tennessee, 2020 Every special weather statement 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.