Alert archive / Tennessee / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 67, NWS Nashville, TN

June 23, 2007DeKalb County, Putnam County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jun 23, 2007, 1:17 PM CDT for DeKalb County, Putnam County, Tennessee. It was in force for 28 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: Jun 23, 2007, 1:17 PM CDT (18:17 UTC)
Expired: Jun 23, 2007, 1:45 PM CDT
In force: 28 min
Issued by: NWS Nashville, TN
Area: Counties, with a storm outline in the text

Counties DeKalb County, TN, Putnam County, TN

The radar

The Nashville radar (KOHX), 77 km from the middle of the area, began a volume at 18:20 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, 6.3 hours before the alert went out and 77 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: 555 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1263 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 71 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

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

000 
WUUS54 KOHX 231817
SVROHX
TNC041-141-231845-
/O.NEW.KOHX.SV.W.0067.070623T1817Z-070623T1845Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
117 PM CDT SAT JUN 23 2007

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN DEKALB COUNTY IN TENNESSEE...
  SOUTHWESTERN PUTNAM COUNTY IN TENNESSEE...

* UNTIL 145 PM CDT

* AT 114 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER
  CENTRAL DEKALB COUNTY...OR ABOUT NEAR SMITHVILLE...AND MOVING
  NORTHEAST AT 10 MPH.

* THE SEVERE THUNDERSTORM WILL REMAIN OVER...
  RURAL NORTHEASTERN DEKALB COUNTY AT 130 PM CDT
  RURAL SOUTHWESTERN PUTNAM COUNTY AT 140 PM CDT

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

LAT...LON 3601 8588 3587 8569 3608 8554 3620 8577

$$
STEIGERWALDT

1 follow-up statement

000 
WWUS54 KOHX 231840
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
140 PM CDT SAT JUN 23 2007

TNC041-141-231850-
/O.EXP.KOHX.SV.W.0067.000000T0000Z-070623T1845Z/
DEKALB TN-PUTNAM TN-
140 PM CDT SAT JUN 23 2007

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL PUTNAM AND EAST
CENTRAL DEKALB COUNTIES EXPIRES AT 145 PM CDT...

THE STORM HAS BEGUN WEAKENING IN INTENSITY.

LAT...LON 3605 8576 3596 8571 3608 8554 3616 8569

$$
STEIGERWALDT

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 Jun 23, 10:55 AM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Jun 23, 10:55 AM CDT, 2 hours 22 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
1055 AM CDT SAT JUN 23 2007

.UPDATE...MORNING SURFACE ANALYSIS SHOWED WEAK, SHALLOW QUASI-STATIONARY
FRONT EXTENDING FROM NEAR PADUCAH, KENTUCKY TO NEAR CROSSVILLE,
TENNESSEE. DEW POINTS REMAIN HIGH ACROSS OUR FORECAST AREA, WITH
DEW POINT FRONT WAY UP ACROSS EXTREME NORTHERN KENTUCKY AND
SOUTHERN OHIO. SURFACE HIGH HAD ALREADY PUSHED EASTWARD INTO OHIO
AND PENNSYLVANIA.

LATEST WRF MODEL SHOWED BAND OF HIGH 850-500MB MOISTURE LYING
ACROSS THE NORTHERN TWO-THIRDS OF THE MID-STATE AT 14Z, BUT
FORECAST TO LIFT NORTHWARD DURING THE DAY. BY LATE IN THE DAY,
DEEPEST MOISTURE IS EXPECTED TO BE ARCED UP ACROSS OUR
NORTHWESTERN COUNTIES AND DOWN ACROSS THE NORTHERN CUMBERLAND
PLATEAU, DELINEATING THE TWO AREAS THAT WILL PROBABLY SEE THE BEST
CHANCE FOR SCATTERED AFTERNOON THUNDERSTORMS TODAY.

CURRENT MAX TEMPERATURE AND RAIN PROBABILITY FORECASTS FOR TODAY
LOOK REASONABLE AND SEE NO REASON TO FIDDLE AROUND WITH THEM AT
THIS TIME.

&&

.

.OHX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

19

Hazardous weather outlook, Jun 23, 5:16 AM CDT, 8 hours 1 minute before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
516 AM CDT SAT JUN 23 2007

TNZ005>011-022>034-056>066-075-077>080-093>095-241030-
BEDFORD-BENTON-CANNON-CHEATHAM-CLAY-COFFEE-CUMBERLAND-DAVIDSON-
DEKALB-DICKSON-FENTRESS-GILES-GRUNDY-HICKMAN-HOUSTON-HUMPHREYS-
JACKSON-LAWRENCE-LEWIS-MACON-MARSHALL-MAURY-MONTGOMERY-OVERTON-PERRY-
PICKETT-PUTNAM-ROBERTSON-RUTHERFORD-SMITH-STEWART-SUMNER-TROUSDALE-
VAN BUREN-WARREN-WAYNE-WHITE-WILLIAMSON-WILSON-
516 AM CDT SAT JUN 23 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

31

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 23, 1:06 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury	24 min
Jun 23, 1:20 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee	28 min
Jun 23, 1:37 PM CDT	Severe Thunderstorm Warning	OHX	Giles	23 min
Jun 23, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Overton	25 min
Jun 23, 5:55 PM CDT	Severe Thunderstorm Warning	OHX	Fentress	35 min
Jun 23, 6:25 PM CDT	Severe Thunderstorm Warning	OHX	Van Buren	35 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2007 Every severe thunderstorm warning in 2007

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.