Alert archive / Tennessee / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 249, NWS Nashville, TN

August 19, 1999DeKalb County, Smith County, Wilson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 19, 1999, 4:45 PM CDT for DeKalb County, Smith County, Wilson County, Tennessee. It was in force for 30 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Aug 19, 1999, 4:45 PM CDT (21:45 UTC)
Expired: Aug 19, 1999, 5:15 PM CDT
In force: 30 min
Issued by: NWS Nashville, TN
Area: Whole counties

Counties DeKalb County, TN, Smith County, TN, Wilson County, TN

The radar

The Nashville radar (KOHX), 50 km from the middle of the area, began a volume at 21:44 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.

What was reported inside it

Time	Report	Where	Remark
Aug 19, 5:07 PM CDT	Thunderstorm Wind 50	Lebanon, TN	Telephone poles and trees were down about 7 miles east of Lebanon on Tuckers Crossroads.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 9.8 hours before the alert went out and 51 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: 272 J/kg
Mixed-layer CIN: -217 J/kg
Mixed-layer LCL: 1698 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

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, 2 hours 5 minutes earlier.

Area forecast discussion, Aug 19, 2:40 PM CDT, 2 hours 5 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, 18 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

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 3:00 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	30 min
Aug 19, 3:37 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lincoln	33 min
Aug 19, 4:13 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Wilson	32 min
Aug 19, 5:16 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, Putnam, Smith	29 min
Aug 19, 6:15 PM CDT	Severe Thunderstorm Warning	OHX	Jackson, Putnam	30 min
Aug 19, 6:34 PM CDT	Severe Thunderstorm Warning	OHX	Sumner	36 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1999 Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.