Alert archive / Tennessee / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 340, NWS Nashville, TN

July 12, 2003Giles County, Marshall County, Maury County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 12, 2003, 9:40 PM CDT for Giles County, Marshall County, Maury County, Tennessee. It was in force for 30 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: Jul 12, 2003, 9:40 PM CDT (02:40 UTC)
Expired: Jul 12, 2003, 10:10 PM CDT
In force: 30 min
Issued by: NWS Nashville, TN
Area: Counties, with a storm outline in the text

Counties Giles County, TN, Marshall County, TN, Maury County, TN

The radar

The Nashville radar (KOHX), 93 km from the middle of the area, began a volume at 02:44 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 2.7 hours before the alert went out and 80 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: 89 J/kg
Mixed-layer CIN: -167 J/kg
Mixed-layer LCL: 1585 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -30 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOHX 130240
SVRBNA
TNC055-117-119-130310-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
939 PM CDT SAT JUL 12 2003

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN GILES COUNTY IN TENNESSEE
  SOUTHERN MARSHALL COUNTY IN TENNESSEE
  SOUTHERN MAURY COUNTY IN TENNESSEE

* UNTIL 1010 PM CDT

* AT 932 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES NORTH OF LYNNVILLE...OR 7 MILES
  SOUTHEAST OF COLUMBIA...MOVING SOUTHEAST AT 25 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  CORNERSVILLE AROUND 1010 PM CDT

EXCESSIVE LIGHTNING IS OCCURRING WITH THIS STORM, AND 1 INCH HAIL 
WAS REPORTED EARLIER IN COLUMBIA. MOVE INDOORS IF POSSIBLE. STAY 
AWAY FROM WINDOWS AND DOORS, AND AVOID USING ELECTRICAL APPLIANCES 
OR TELEPHONES UNLESS IT IS AN EMERGENCY. &&
LAT...LON 3563 8693 3553 8711 3517 8694 3532 8665
$$
ROSE

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 12, 3:01 PM CDT, 6 hours 39 minutes earlier.

Area forecast discussion, Jul 12, 3:01 PM CDT, 6 hours 39 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
301 PM CDT SAT JUL 12 2003

CLOUD TOP TEMPS FROM CONVECTION EARLIER THIS MORNING WELL W OF OUR
AREA HAVE WARMED AND OTHERWISE APPEARS TO BE THINNING OUT. ISOLATED
STORMS NOW DEVELOPING OVER OUR E COUNTIES. TAD MORE ACTIVITY HAS
DEVELOPED OVER S KY AND SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED
FOR ALL OF MIDDLE TN UNTIL 8 PM.

LOOKING AT WHAT IS AVAILABLE IN AWIPS AT THIS TIME...NAMELY THE ETA
AND GFS 12Z RUNS...GFS FORECASTS WEAK COLD FRONT OR TROUGH TO MOVE
TO TN/AL BORDER AREA AND INTO SE TN BY 12Z SUN. ETA MODEL KEEPS IT
OVER KY. LOOKING AT 18Z MSAS ANALYSIS...APPEARS ETA MODEL IS TOO
SLOW WITH SE MOVEMENT OF FRONT. I WILL FAVOR BRINGING FRONT S PER
THE GFS MODEL TO AL/TN BORDER OR AT LEAST S MIDDLE TN OVERNIGHT.

GFS LOWERS MEAN RELATIVE HUMIDITIES OVERNIGHT...PROBABLY TOO MUCH
SO...BUT ONLY SMALL AMOUNT OF 500 MB VORTICITY ADVECTION SEEN...ITS
MAINLY CHANNELED VORTICITY. LITTLE OR NO WARM ADVECTION FORECAST BY
GFS OVERNIGHT AT BOTH 850 AND 700 MB LEVELS. IF GFS RIGHT...THERE
WILL BE LITTLE REASON FOR PRECIP LATER TONIGHT IN N. BUT WILL KEEP
SOME POPS IN S ALL NIGHT WITH FRONT REACHING THAT PART OF MID STATE
BY LATE TONIGHT.

NOT MENTIONING ANY PRECIP ACROSS THE N ON SUN AS IT APPEARS TOO DRY
AND NO CONTRIBUTION FROM VORTICITY OR WARM ADVETION TO INITIATE
PRECIP. IN S WILL CONTINUE A LOW POP WHERE MOISTURE WILL BE BETTER.

IN EXTENDED PART OF FORECAST...NEXT CHANCE OF PRECIP WILL BE
ASSOCIATED WITH APPROACH OF COLD FRONT WED AND WED NIGHT...AND
EXPECTED FRONTAL PASSAGE ON THU OR THU NIGHT. SLIGHT CHANCE OF
PRECIP AGAIN CUMBERLAND PLATEAU AREA ONLY ON SAT ASSOCIATED WITH
UPPER LEVEL SHORT WAVE THAT WILL MOVE ACROSS THAT AREA...AND WHERE
MEAN RELATIVE HUMIDITIES ARE FORECAST TO BE HIGHER.

WITH NO NEW GUIDANCE...HAVE NOT CHANGED PREVIOUS FORECAST
TEMPERATURES MUCH THROUGH THE FORECAST PERIOD.

PRELIMINARY NUMBERS

BNA 64/84/64/87 4111
CSV 61/80/61/83 4111

.BNA....NONE.

STEIGERWALDT

Hazardous weather outlook, Jul 12, 5:30 AM CDT, 16 hours 10 minutes before

TNZ005>011-022>034-056>066-075>080-093>097-131030-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
530 AM CDT SAT JUL 12 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

WHILE THUNDERSTORMS ARE EXPECTED TO BE SCATTERED TODAY AND TONIGHT
...THERE IS A SMALL POSSIBILITY THAT A FEW MAY REACH SEVERE LIMITS
LATER TODAY...WITH THE MAIN THREAT DAMAGING WINDS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS UNLIKELY.

07

In the hours before

Local storm report, Jul 12, 4:45 PM CDT, 4 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
0445 PM CDT SAT JUL 12 2003

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

0332 PM    9 SW SPARTA               TN   WIND DAMAGE
07/12/03   WHITE                          TREES BLOWN DOWN AT
                                          QUEBECK...REPORTED BY THE
                                          PUBLIC

0257 PM    8 WNW SPARTA              TN   WIND DAMAGE
07/12/03   WHITE                          BARN PARTIALLY DAMAGED AT
                                          CASSVILLE...REPORTED BY
                                          PUBLIC

STEIGERWALDT

Local storm report, Jul 12, 5:29 PM CDT, 4 hours 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
0529 PM CDT SAT JUL 12 2003

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

0415 PM    8 SE SPRINGFIELD          TN   WIND DAMAGE
07/12/03   ROBERTSON                      TREES BLOWN
                                          DOWN...REPORTED BY THE
                                          PUBLIC

0401 PM    3 W SPRINGFIELD           TN   WIND DAMAGE
07/12/03   ROBERTSON                      TREES BLOWN
                                          DOWN...REPORTED BY PUBLIC

STEIGERWALDT

Local storm report, Jul 12, 6:08 PM CDT, 3 hours 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
0608 PM CDT SAT JUL 12 2003

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

0511 PM    13 SW NASHVILLE           TN   WIND DAMAGE
07/12/03   DAVIDSON                       TREE DOWN AT INTERSECTION
                                          OF HIGHWAY 70 AND HIGHWAY
                                          70 SOUTH OR ABOUT 3 NW OF
                                          BELLEVUE...REPORTED BY
                                          PUBLIC

0511 PM    14 SW NASHVILLE           TN   WIND DAMAGE
07/12/03   DAVIDSON                       TREE REPORTED DOWN ABOUT 4
                                          NW BELLEVUE...REPORTED BY
                                          PUBLIC

STEIGERWALDT

Local storm report, Jul 12, 9:36 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
0936 PM CDT SAT JUL 12 2003

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

0925 PM    COLUMBIA                  TN   1.00 IN HAIL
07/12/03   MAURY                          REPORTED BY AMATEUR RADIO
                                          OPERATOR

ROSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 12, 8:56 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	34 min
Jul 12, 9:09 PM CDT	Severe Thunderstorm Warning	OHX	Maury	31 min
Jul 12, 9:44 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Williamson	46 min
Jul 12, 10:19 PM CDT	Flash Flood Warning	OHX	Maury	3 hr
Jul 12, 10:51 PM CDT	Flash Flood Warning	OHX	Marshall	3 hr
Jul 12, 11:36 PM CDT	Flash Flood Warning	OHX	Hickman	3 hr
Jul 13, 10:59 AM CDT	Severe Thunderstorm Warning	OHX	Fentress	31 min
Jul 13, 11:37 AM CDT	Severe Thunderstorm Warning	OHX	Fentress	38 min
Jul 13, 12:03 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Pickett	27 min
Jul 13, 1:00 PM CDT	Flash Flood Warning	OHX	Sumner	2 hr
Jul 13, 2:07 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	23 min
Jul 13, 2:11 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Wilson	34 min
Jul 13, 2:21 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Trousdale	39 min
Jul 13, 2:27 PM CDT	Severe Thunderstorm Warning	OHX	Marshall	33 min
Jul 13, 2:42 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Rutherford	48 min
Jul 13, 2:58 PM CDT	Severe Thunderstorm Warning	OHX	Smith, Wilson	32 min
Jul 13, 3:07 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	23 min
Jul 13, 3:09 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	51 min
Jul 13, 3:26 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	49 min
Jul 13, 3:30 PM CDT	Severe Thunderstorm Warning	OHX	Cannon, Coffee, Rutherford	45 min
Jul 13, 3:39 PM CDT	Severe Thunderstorm Warning	OHX	Perry	31 min
Jul 13, 3:44 PM CDT	Severe Thunderstorm Warning	OHX	Warren	46 min
Jul 13, 4:09 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	36 min
Jul 13, 4:14 PM CDT	Tornado Warning	OHX	Grundy, Warren	31 min
Jul 13, 4:20 PM CDT	Tornado Warning	OHX	Coffee, Grundy, Warren	25 min
Jul 13, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	40 min
Jul 13, 4:52 PM CDT	Severe Thunderstorm Warning	OHX	Robertson	23 min
Jul 13, 5:00 PM CDT	Severe Thunderstorm Warning	OHX	Franklin, Grundy	15 min
Jul 13, 5:09 PM CDT	Severe Thunderstorm Warning	OHX	Hickman	36 min
Jul 13, 5:11 PM CDT	Severe Thunderstorm Warning	OHX	Lewis, Maury	34 min
Jul 13, 5:16 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Sumner, Wilson	44 min
Jul 13, 5:42 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	43 min
Jul 13, 5:57 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Rutherford, Williamson	33 min
Jul 13, 5:59 PM CDT	Severe Thunderstorm Warning	OHX	Sumner	31 min
Jul 13, 6:02 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Rutherford, Williamson	28 min
Jul 13, 6:48 PM CDT	Severe Thunderstorm Warning	OHX	Dickson	37 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2003 Every severe thunderstorm warning in 2003

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.