Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 255, NWS Nashville, TN

August 19, 1999Clay County, Macon County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 19, 1999, 7:50 PM CDT for Clay County, Macon County, Tennessee. It was in force for 35 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 19, 1999, 7:50 PM CDT (00:50 UTC)
Expired
Aug 19, 1999, 8:25 PM CDT
In force
35 min
Issued by
NWS Nashville, TN
Area
Whole counties

Counties Clay County, TN, Macon County, TN

The radar

The Nashville radar (KOHX), 78 km from the middle of the area, began a volume at 00:53 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 19, 5:30 PM CDTSevere Thunderstorm WatchSPC6 hr

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 0.8 hours before the alert went out and 365 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, Cncnati-Daytn, OH at 00:00Z on 1999-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 296 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, Cncnati-Daytn, OH at 00:00Z on 1999-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.19395878Sfc1 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
296 J/kg
Mixed-layer CIN
-59 J/kg
Mixed-layer LCL
941 m above ground
0-6 km bulk shear
42 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Aug 19, 2:40 PM CDT, 5 hours 10 minutes earlier.

Area forecast discussion, Aug 19, 2:40 PM CDT, 5 hours 10 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
240 PM CDT THU AUG 19 1999

CURRENT...CONVECTION STARTING TO FIRE SW MIDDLE TN AND NRN
CUMBERLAND PLATEAU AHEAD OF CDFNT IN WRN TN APPROACHING TN RIVER.
TEMPS HOT...IN MID 90S TO NR 100 DEG FOR MOST PART.

FORECAST...SOME MORE TSTMS THIS AFTN AND EVE IN CONVERGENCE ZONE
AMD MODERATE INSTABILITY.  COULD BE ISOLATED SEVERE...BUT WON/T
MENTION IN ZONES.  HAVE TO WATCH OUTFLOW BOUNDARY OVER CENTRAL KY AS
IT PUSHES S.  BEST POPS TONITE E PORTIONS.  FRONT GETS TO PLATEAU
LATE TONITE AND MOVES SLOLY E THEREAFTER.  HI PRES BUILDS IN FROM
MIDWEST AFTER TOMORROW.

AS FOR TEMPS...A BIT TRICKY FOR HI TEMP FRI.  AM REMINDED OF LAST
FRONT THAT WENT THRU AND TEMPS FOLLOWING IT (AUG 14TH) WERE MUCH CCOLER
THAN MOS FORECAST (SOME 10 DEG).  LOOKE UPSTREAM WHERE COLD IR SC IS
OCCURING AND MODEL PERFORMANCE WAS OFF 5-10 DEG IN PLACES LIKE SPI
AND DSM.  LOOKED BACK ON SATURDAY AND FOUND THAT MODELS WOULD HAVE YIELDED
UPPER 70S TO NEAR 80 IF LOCAL TEMP SCHEME UTILIZED.  USED IT FOR
TOMORROW AND IT YIELDS LOWER 80S SO WILL UNDERCUT MOS BY ABOUT 5
DEG...MAYBE MORE IF SO INCLINED.  ONLY THING IS...THIS RUN NOT AS
PRONOUNCED W/ SC FIELD AS SATURDAY WAS.

BNA  EB  68/82/65/88  2000
CSV  EB  64/79/60/84  3000

.BNA...NONE.

MAG

In the hours before

Local storm report, Aug 19, 4:27 PM CDT, 3 hours 23 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
427 PM CDT FRI AUG 19 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0329 PM    DIANA                     TN   WIND DAMAGE
08/19/99   GILES                          COUNTY SHERIFF REPORTED
                                          TREES AND POWER LINES BLOWN
                                          DOWN NEAR DIANA

0350 PM    APPLETON                  TN   .75 INCH HAIL
08/19/99   LAWRENCE                       SPOTTER REPORTED THE HAIL NEAR
                                          APPLETON

0412 PM    LEBANON                   TN   .75 INCH HAIL
08/19/99   WILSON                         SPOTTER REPORTED THE HAIL JUST
                                          SOUTHWEST OF LEBANON

STEIGERWALDT
Local storm report, Aug 19, 5:07 PM CDT, 2 hours 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
507 PM CDT FRI AUG 19 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0450 PM    ST JOSEPH                 TN   .75 INCH HAIL
08/19/99   LAWRENCE                       REPORTED BY SPOTTER

STEIGERWALDT
Local storm report, Aug 19, 5:20 PM CDT, 2 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
520 PM CDT FRI AUG 19 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0507 PM    LEBANON                   TN   WIND DAMAGE
08/19/99   WILSON                         PUBLIC REPORTED TELEPHONE
                                          POLES BLOWN DOWN ABOUT 7
                                          E OF LEBANON AT TUCKERS
                                          CROSSROADS

STEIGERWALDT
Local storm report, Aug 19, 5:20 PM CDT, 2 hours 30 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
520 PM CDT FRI AUG 19 1999

TIME(CDT)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0507 PM    LEBANON                   TN   WIND DAMAGE
08/19/99   WILSON                         PUBLIC REPORTED TELEPHONE
                                          POLES BLOWN DOWN ABOUT 7
                                          E OF LEBANON AT TUCKERS
                                          CROSSROADS

STEIGERWALDT
Local storm report, Aug 19, 6:57 PM CDT, 53 minutes before
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Local storm report, Aug 19, 6:57 PM CDT, 53 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 Nashville, TN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 19, 7:20 PM CDTSevere Thunderstorm WarningOHXWilson25 min
Aug 19, 7:42 PM CDTSevere Thunderstorm WarningOHXDeKalb, Wilson33 min
Aug 19, 8:14 PM CDTSevere Thunderstorm WarningOHXDeKalb, Smith, Wilson31 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1999Every severe thunderstorm warning in 1999

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.