Alert archive / Tennessee / Special Weather Statements in 2021

Special Weather Statement, NWS Nashville, TN

April 8, 2021Coffee County, Tennessee

NWS Nashville, TN issued this special weather statement at Apr 8, 2021, 9:29 AM CDT for Coffee County, Tennessee. It was in force for 46 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: Apr 8, 2021, 9:29 AM CDT (14:29 UTC)
Expired: Apr 8, 2021, 10:15 AM CDT
In force: 46 min
Issued by: NWS Nashville, TN

County Coffee County, TN

The radar

The Northeast Alabama radar (KHTX), 49 km from the middle of the area, began a volume at 14:32 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, 2.5 hours before the alert went out and 99 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: 55 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 626 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 354 m²/s²
0-3 km storm-relative helicity: 375 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted.

<!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>

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 Apr 8, 6:08 AM CDT, 3 hours 21 minutes earlier.

Area forecast discussion, Apr 8, 6:08 AM CDT, 3 hours 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, Apr 8, 4:19 AM CDT, 5 hours 10 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
419 AM CDT Thu Apr 8 2021

TNZ005>011-023>034-056>066-075-077>080-093>095-090930-
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-
419 AM CDT Thu Apr 8 2021

This Hazardous Weather Outlook is for Middle Tennessee.

.DAY ONE...Today and tonight.

A few strong storms are possible east of I-65 later this morning and
early this afternoon. Strong gusty wind is the main threat.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.

A few strong storms are possible Friday afternoon and also on
Saturday. On Friday the best chance is across the south, and on
Saturday the east. Strong gusty wind is again the main concern,
but large hail is also possible mainly Friday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not likely. Please relay any information about
observed severe weather to the NWS while following all local, state,
and CDC guidelines.

In the hours before

Special weather statement, Apr 8, 9:29 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
929 AM CDT Thu Apr 8 2021

TNZ077-081515-
Coffee TN-
929 AM CDT Thu Apr 8 2021

...SIGNIFICANT WEATHER ADVISORY FOR COFFEE COUNTY UNTIL 1015 AM
CDT...

At 929 AM CDT, Doppler radar was tracking a strong thunderstorm near
Tims Ford Lake, or 7 miles northwest of Winchester, moving northeast
at 35 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Manchester, Tullahoma, Hillsboro, Summitville, Arnold AFB and Woods
Reservoir.

This includes Interstate 24 between mile markers 105 and 126.

LAT...LON 3532 8598 3531 8600 3534 8603 3535 8606
      3536 8615 3535 8616 3536 8618 3534 8620
      3535 8621 3535 8624 3539 8626 3565 8611
      3553 8588 3538 8589 3537 8587 3534 8589
      3533 8591 3532 8590 3530 8594
TIME...MOT...LOC 1429Z 221DEG 32KT 3528 8619

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 8, 1:01 AM CDT	Special Weather Statement	OHX	Bedford, Cannon, Coffee, Macon, Rutherford, Trousdale and 1 more	44 min
Apr 8, 1:32 PM CDT	Special Weather Statement	OHX	Van Buren	28 min
Apr 8, 2:07 PM CDT	Special Weather Statement	OHX	Cumberland	38 min
Apr 8, 2:11 PM CDT	Special Weather Statement	OHX	Overton	34 min
Apr 8, 3:39 PM CDT	Tornado Warning	OHX	Cumberland, Fentress	21 min
Apr 8, 4:57 PM CDT	Special Weather Statement	OHX	Fentress	33 min
Apr 8, 5:15 PM CDT	Tornado Warning	OHX	Fentress	16 min

Nearby

Special Weather Statements in Tennessee, 2021 Every special weather statement in 2021

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.