Alert archive / Tennessee / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 464, NWS Nashville, TN

August 27, 2003Franklin County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 27, 2003, 1:55 PM CDT for Franklin County, Tennessee. It was in force for 50 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: Aug 27, 2003, 1:55 PM CDT (18:55 UTC)
Expired: Aug 27, 2003, 2:45 PM CDT
In force: 50 min
Issued by: NWS Nashville, TN
Area: Counties, with a storm outline in the text

County Franklin County, TN

The radar

The Northeast Alabama radar (KHTX), 40 km from the middle of the area, began a volume at 18:54 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 12:00Z, 6.9 hours before the alert went out and 104 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: 2226 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 999 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 17 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 271855
SVRBNA
TNC051-271945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
154 PM CDT WED AUG 27 2003

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  FRANKLIN COUNTY IN TENNESSEE

* UNTIL 245 PM CDT

* AT 153 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES WEST OF ESTILL SPRINGS...OR 3 MILES
  EAST OF LYNCHBURG...MOVING EAST AT 20 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DECHERD AROUND 200 PM CDT
  SEWANEE AROUND 220 PM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE
FOR DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY
LIGHTNING.

LAT...LON 3538 8626 3520 8628 3514 8586 3535 8583

$$

07

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 27, 9:36 AM CDT, 4 hours 19 minutes earlier.

Area forecast discussion, Aug 27, 9:36 AM CDT, 4 hours 19 minutes before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
936 AM CDT WED AUG 27 2003

CURRENTLY, MORNING CONVECTION AROUND THE WAYNESBORO/LAWRENCEBURG
AREAS APPEARS TO BE DIMINISHING. SKIES ACROSS THE REMAINDER OF THE
MID STATE REMAIN PARTLY CLOUDY, WITH 900 AM TEMPERATURES ALREADY IN
THE LOWER 80S -- UPPER 70S ALONG THE PLATEAU.

MORNING SOUNDING FROM OHX SHOWS ARE VERY MOIST AND UNSTABLE
ENVIRONMENT, WITH PRECIPITABLE WATER UP TO 1.86 INCHES, A K-INDEX OF
37, AND A TOTALS INDEX AN EVEN 50. THE LIFTED INDEX STANDS AT -7.1,
AND THE POSITIVE AREA HAS GROWN TO 3541 J/KG.

SURFACE ANALYSIS AT 13Z SHOWS A COLD FRONT STILL NORTH OF THE OHIO
VALLEY, WHILE THE UPPER AIR ANALYSES SHOW WEAK CONFLUENT FLOW AT 850
MB. OTHERWISE, STRONG HIGH PRESSURE CONTINUES TO DOMINATE OUR
WEATHER ON THE SYNOPTIC SCALE, WITH THE RIDGE AXIS STILL SITUATED TO
THE WEST OF MIDDLE TENNESSEE.

12Z MODEL DATA IS NOW STARTING TO TRICKLE IN FOLLOWING A NIGHT
WITHOUT IT. OTHERWISE, BELIEVE THE CURRENT ZONE FORECAST PRODUCT IS
ON TRACK.

.BNA...NONE.

ROSE

Hazardous weather outlook, Aug 27, 6:40 AM CDT, 7 hours 15 minutes before

TNZ005>011-022>034-056>066-075>080-093>097-281030-

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE NASHVILLE TN
640 AM CDT WED AUG 27 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED ACROSS MIDDLE TENNESSEE TODAY
AND THIS EVENING. HEAT AND HUMIDITY WILL COMBINE TO PRODUCE HEAT
INDEX READINGS AROUND 100 DEGREES IN MUCH OF THE MID STATE THIS
AFTERNOON. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ISOLATED TO SCATTERED THUNDERSTORMS WILL OCCUR MAINLY DURING THE
AFTERNOON AND EVENING EACH DAY THROUGH THE WEEKEND. THE PROBABILITY
FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF SPOTTERS AND EMERGENCY MANAGERS IS NOT LIKELY.

31/13

In the hours before

Local storm report, Aug 27, 1:53 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
0153 PM CDT WED AUG 27 2003

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

0140 PM    MINOR HILL                TN   WIND DAMAGE
08/27/03   GILES                          TREES AND POWER LINES DOWN

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 27, 12:53 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	37 min
Aug 27, 1:44 PM CDT	Severe Thunderstorm Warning	OHX	Giles	31 min
Aug 27, 1:46 PM CDT	Severe Thunderstorm Warning	OHX	Moore	14 min
Aug 27, 1:58 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	32 min
Aug 27, 2:14 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	31 min
Aug 27, 2:23 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	37 min
Aug 27, 2:32 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	43 min
Aug 27, 2:35 PM CDT	Severe Thunderstorm Warning	OHX	Bedford	40 min
Aug 27, 2:49 PM CDT	Flash Flood Warning	OHX	Lawrence, Wayne	116 min
Aug 27, 2:55 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	35 min
Aug 27, 3:29 PM CDT	Severe Thunderstorm Warning	OHX	Davidson	31 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.