Alert archive / Tennessee / Severe Thunderstorm Warnings in 1996

Severe Thunderstorm Warning 166, NWS Nashville, TN

July 21, 1996Sumner County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 21, 1996, 9:46 PM CDT for Sumner County, Tennessee. It was in force for 59 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: Jul 21, 1996, 9:46 PM CDT (02:46 UTC)
Expired: Jul 21, 1996, 10:45 PM CDT
In force: 59 min
Issued by: NWS Nashville, TN
Area: Whole counties

County Sumner County, TN

The radar

The Nashville radar (KOHX), 26 km from the middle of the area, began a volume at 02:45 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 00:00Z, 2.8 hours before the alert went out and 40 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: 1165 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 1570 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KBNA 220244
SVRBNA
TNC165-220345-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
946 PM CDT SUN JUL 21 1996
 
THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1045 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN MIDDLE TENNESSEE
 
   ...SUMNER COUNTY
 
AT 945 PM CDT...A SEVERE THUNDERSTORM WAS LOCATED IN NORTHERN DAVIDSON
COUNTY NEAR MILLERSVILLE MOVING SOUTHEST AT 30 MILES AN HOUR. THE STORM
SHOULD AFFECT THE GALLATIN AREA OF SUMNER COUNTY BETWEEN 10 AND 1030 PM
CDT.
 
 
THIS IS A DANGEROUS STORM.  IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING.  PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.

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 Jul 21, 8:02 PM CDT, 1 hour 44 minutes earlier.

Area forecast discussion, Jul 21, 8:02 PM CDT, 1 hour 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
802 PM SUN JUL 21 1996

TSTMS LATE AFTN AND EVE RESULTED FM GUD INSTABILITY...ALG WITH UPR LVL
DIV/LO LVL CONV...A 500 MB S/WV MOVG ESE ACRS OH VLY...AND HI 850 MB
DEW PTS IN PARTICULAR. BOW ECHOES WERE THE CAUSE OF DAMAGE IN THE
NASHVILLE AREA.

EXPECT LESS ACTIVITY LTR TNGT AS HEATG AND UPR LVL S/WV BGNS MOVG TO E
OF AREA. BUT APCH OF SFC TROF FM W/NW...WITH LO LVL CYC FLO AND CONTD
THETA RDG AXIS AT BOTH 1000 AND 850 MB LVLS ACRS AREA OVRNGT WL BE ENUF
TO CONT CHC OF TSTMS ALL NGT.
STEIGERWALDT

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 7:00 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	45 min
Jul 21, 7:07 PM CDT	Severe Thunderstorm Warning	OHX	Wilson	53 min
Jul 21, 7:09 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Trousdale	51 min
Jul 21, 8:00 PM CDT	Severe Thunderstorm Warning	OHX	DeKalb, Smith	45 min
Jul 21, 8:24 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery	51 min
Jul 21, 8:50 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	40 min
Jul 21, 9:13 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	47 min
Jul 21, 9:30 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	60 min
Jul 21, 9:51 PM CDT	Severe Thunderstorm Warning	OHX	Wilson	69 min
Jul 21, 10:09 PM CDT	Flash Flood Warning	OHX	Davidson, Sumner, Wilson	3 hr
Jul 22, 12:14 AM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis, Maury	46 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 1996 Every severe thunderstorm warning in 1996

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.