Alert archive / Tennessee / Special Weather Statements in 2017

Special Weather Statement, NWS Nashville, TN

April 18, 2017Coffee County, Tennessee

NWS Nashville, TN issued this special weather statement at Apr 18, 2017, 3:17 PM CDT for Coffee County, Tennessee. It was in force for 28 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 18, 2017, 3:17 PM CDT (20:17 UTC)
Expired: Apr 18, 2017, 3:45 PM CDT
In force: 28 min
Issued by: NWS Nashville, TN

County Coffee County, TN

The radar

The Northeast Alabama radar (KHTX), 47 km from the middle of the area, began a volume at 20:16 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, 8.3 hours before the alert went out and 101 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: 39 J/kg
Mixed-layer CIN: -84 J/kg
Mixed-layer LCL: 638 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 39 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 Apr 18, 12:20 PM CDT, 2 hours 57 minutes earlier.

Area forecast discussion, Apr 18, 12:20 PM CDT, 2 hours 57 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.
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Hazardous weather outlook, Apr 18, 8:02 AM CDT, 7 hours 15 minutes before

Hazardous Weather Outlook
National Weather Service Nashville TN
802 AM CDT Tue Apr 18 2017

TNZ005>011-023>034-056>066-075-077>080-093>095-191315-
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-
802 AM CDT Tue Apr 18 2017

This Hazardous Weather Outlook is for portions of Middle
Tennessee.

.DAY ONE...Today and Tonight.

A few strong storms will be possible this afternoon across all of
Middle Tennessee. The main concerns will be small hail and gusty
winds.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday.

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

27

In the hours before

Special weather statement, Apr 18, 2:19 PM CDT, 58 minutes before

Special Weather Statement
National Weather Service Nashville TN
219 PM CDT TUE APR 18 2017

TNZ005-181945-
Stewart TN-
219 PM CDT TUE APR 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN STEWART COUNTY UNTIL 245
PM CDT...

At 218 PM CDT, Doppler radar was tracking a strong thunderstorm over
Paris Landing State Park, moving northeast at 20 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Dover and Land Between The Lakes.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If on or near Kentucky Lake, get out of the water and move indoors
or inside a vehicle. Remember, lightning can strike out to 10 miles
from the parent thunderstorm. If you can hear thunder, you are close
enough to be struck by lightning. Move to safe shelter now! Do not
be caught on the water in a thunderstorm.

&&

LAT...LON 3647 8805 3649 8806 3651 8804 3653 8803
      3656 8803 3662 8805 3667 8797 3667 8789
      3642 8775 3638 8801 3639 8801 3642 8804
      3645 8806
TIME...MOT...LOC 1918Z 244DEG 16KT 3646 8811

Shamburger

Special weather statement, Apr 18, 3:17 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Nashville TN
317 PM CDT TUE APR 18 2017

TNZ077-182045-
Coffee TN-
317 PM CDT TUE APR 18 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN COFFEE COUNTY UNTIL
345 PM CDT...

At 317 PM CDT, Doppler radar was tracking a strong thunderstorm over
Estill Springs, moving northeast at 20 mph.

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

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

LAT...LON 3531 8594 3531 8596 3530 8596 3532 8598
      3531 8600 3534 8603 3535 8606 3536 8615
      3536 8616 3535 8616 3535 8617 3550 8614
      3545 8589 3530 8594
TIME...MOT...LOC 2017Z 205DEG 19KT 3528 8609

Shamburger

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 2:19 PM CDT	Special Weather Statement	OHX	Stewart	26 min
Apr 18, 3:40 PM CDT	Special Weather Statement	OHX	Davidson	35 min
Apr 18, 3:43 PM CDT	Special Weather Statement	OHX	Davidson	32 min
Apr 18, 4:13 PM CDT	Special Weather Statement	OHX	Davidson	32 min
Apr 18, 5:19 PM CDT	Areal Flood Advisory	OHX	Davidson, Williamson	3 hr
Apr 18, 5:32 PM CDT	Special Weather Statement	OHX	Rutherford	28 min
Apr 18, 5:59 PM CDT	Special Weather Statement	OHX	Williamson	31 min
Apr 18, 6:46 PM CDT	Special Weather Statement	OHX	Wilson	44 min

Nearby

Special Weather Statements in Tennessee, 2017 Every special weather statement in 2017

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.