Alert archive / Tennessee / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 344, NWS Nashville, TN

July 4, 2011Giles County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jul 4, 2011, 3:47 PM CDT for Giles 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 4, 2011, 3:47 PM CDT (20:47 UTC)
Expired: Jul 4, 2011, 4:17 PM CDT
In force: 30 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Giles County, TN

The radar

The Northeast Alabama radar (KHTX), 99 km from the middle of the area, began a volume at 20:50 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, 8.8 hours before the alert went out and 127 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: 2292 J/kg
Mixed-layer CIN: -51 J/kg
Mixed-layer LCL: 889 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 70 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.

251 
WUUS54 KOHX 042047
SVROHX
TNC055-042145-
/O.NEW.KOHX.SV.W.0344.110704T2047Z-110704T2145Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
347 PM CDT MON JUL 4 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN GILES COUNTY IN MIDDLE TENNESSEE...

* UNTIL 445 PM CDT

* AT 344 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING ONE INCH DIAMETER HAIL...
  AND DAMAGING WINDS IN EXCESS OF 60 MPH. THE STORM WAS NEAR MINOR
  HILL...MOVING SOUTHEAST AT 12 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MINOR HILL...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2. DO NOT
STAY OUTDOORS IF YOU ARE IN THE PATH OF SEVERE THUNDERSTORMS.

&&

LAT...LON 3500 8722 3507 8723 3511 8721 3513 8721
      3514 8720 3516 8721 3517 8720 3505 8693
      3500 8695
TIME...MOT...LOC 2047Z 290DEG 10KT 3513 8718

$$

FORECASTER:BOYD

1 follow-up statement

975 
WWUS54 KOHX 042117
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
417 PM CDT MON JUL 4 2011

TNC055-042127-
/O.CAN.KOHX.SV.W.0344.000000T0000Z-110704T2145Z/
GILES TN-
417 PM CDT MON JUL 4 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GILES COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

LAT...LON 3500 8722 3507 8723 3511 8721 3513 8721
      3514 8720 3516 8721 3517 8720 3505 8693
      3500 8695
TIME...MOT...LOC 2117Z 290DEG 10KT 3510 8708

$$

JLM

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 4, 3:44 PM CDT, 3 minutes earlier.

Area forecast discussion, Jul 4, 3:44 PM CDT, 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
344 PM CDT MON JUL 4 2011

.SHORT TERM (TUE-WED)...
H5 TROF WL CONTINUE TO DROP SOUTH OVR THE AREA TNGT WITH ISO-SCT
RW/TRW EXPECTED THIS EVE. ATM IS MORE UNSTABLE WITH DEEPER MOISTURE
SOUTH. ISO SVR STORMS REMAIN POSSIBLE FOR HAIL AND DAMAGING WINDS.
FURTHER NORTH...ISO RW/TRW- ACTIVITY EXPECTED THIS EVE.

GFS MODEL SHOWS NOCTURNAL SYS DEVELOPING IN THE SOUTHERN PLAINS
AROUND MIDNIGHT TNGT. SYS XPECTED TO MOVE E INTO W/SW MID TN
OVERNIGHT WHERE DEEPER MOISTURE WL BE. WL KEEP HIGHER POPS S MID
TN OVERNIGHT.

H5 TROF AND SFC FNTL BDRY STALL OVR THE AREA TUE-WED. THE PERIOD
WL FEATURE MORE CLOUDS WITH A CHC OF RW/TRW. GFS TEMPS TOO HIGH.
VERY LITTLE WIND WITH THIS SYSTEM...NOT EXPECTING ORGANIZED SVR
WEATHER ATTM.

.LONG TERM (THU-MON)...
H5 RIDGE OVR THE SOUTHERN PLAINS SHIFTS EAST WITH WARMER TEMPS
LATE IN THE WEEK/WEEKEND. MOISTURE DECREASES BUT WL KEEP A SMALL
CHC FOR MAINLY AFTERNOON ACTIVITY INTO THE WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      71  89  71  90 /  30  50  40  20
CLARKSVILLE    70  89  68  90 /  30  50  30  20
CROSSVILLE     66  86  67  86 /  30  50  50  40
COLUMBIA       72  90  71  91 /  50  50  50  20
LAWRENCEBURG   71  90  70  92 /  50  50  50  40
WAVERLY        71  90  69  92 /  40  50  30  20

&&

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

04

Hazardous weather outlook, Jul 4, 12:14 PM CDT, 3 hours 33 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
1214 PM CDT MON JUL 4 2011

TNZ005>011-022>034-056>066-075-077>080-093>095-051030-
STEWART-MONTGOMERY-ROBERTSON-SUMNER-MACON-CLAY-PICKETT-BENTON-
HOUSTON-HUMPHREYS-DICKSON-CHEATHAM-DAVIDSON-WILSON-TROUSDALE-
SMITH-JACKSON-PUTNAM-OVERTON-FENTRESS-PERRY-HICKMAN-LEWIS-
WILLIAMSON-MAURY-MARSHALL-RUTHERFORD-CANNON-DE KALB-WHITE-
CUMBERLAND-BEDFORD-COFFEE-WARREN-GRUNDY-VAN BUREN-WAYNE-LAWRENCE-
GILES-
1214 PM CDT MON JUL 4 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

ISOLATED SEVERE STORMS ARE POSSIBLE THIS AFTERNOON AND EVENING.
THE MAIN THREAT WILL BE DAMAGING WINDS AND LARGE HAIL.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

EVEN THOUGH ANY SEVERE THUNDERSTORMS ARE EXPECTED TO BE BRIEF AND
ISOLATED, SPOTTERS ARE ENCOURAGED TO CLOSELY MONITOR WEATHER
CONDITIONS AND BE PREPARED TO CALL IN ANYTHING REACHING REPORTING
CRITERIA.

SPOTTER THUNDERSTORM REPORTING CRITERIA...
TORNADO
FUNNEL CLOUD
FLOODING
HAIL >= 1/2 INCH
WINDS > 50 MPH (MEASURED)
STRUCTURAL DAMAGE
TREES OR POWER LINES DOWN

BOYD

In the hours before

Special weather statement, Jul 4, 2:06 PM CDT, 1 hour 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
206 PM CDT MON JUL 4 2011

TNZ056-093-042000-
PERRY-WAYNE-
206 PM CDT MON JUL 4 2011

...SIGNIFICANT WEATHER ADVISORY FOR PERRY AND WAYNE COUNTIES...

AT 203 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR SARDIS...OR 16 MILES NORTH OF
SAVANNAH...MOVING EAST AT 15 MPH. IF YOU LIVE IN WAYNE COUNTY STAY
ABREAST OF THE WEATHER THIS AFTERNOON AS STORMS COULD QUICKLY BECOME
SEVERE.

HALF INCH SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3502 8800 3530 8799 3531 8802 3539 8803
      3541 8797 3543 8804 3545 8805 3549 8798
      3556 8799 3546 8765 3544 8761 3542 8760
      3542 8757 3518 8757 3501 8761

BOYD

Local storm report, Jul 4, 3:26 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
326 PM CDT MON JUL 04 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0315 PM     HAIL             LAWRENCEBURG            35.25N 87.34W
07/04/2011  E0.88 INCH       LAWRENCE           TN   PUBLIC

&&

BBOYD

Local storm report, Jul 4, 3:36 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
336 PM CDT MON JUL 04 2011

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0317 PM     TSTM WND DMG     1 W LAWRENCEBURG        35.25N 87.36W
07/04/2011                   LAWRENCE           TN   EMERGENCY MNGR

            DOWNED TREES AND POWER LINES ARE BLOCKING U.S. HWY 64
            WEST OF LAWRENCEBURG.

&&

11

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:29 AM CDT	Special Weather Statement	OHX	Cheatham, Davidson, Dickson, Macon, Robertson, Sumner and 3 more	61 min
Jul 4, 2:06 PM CDT	Special Weather Statement	OHX	Wayne	54 min
Jul 4, 2:16 PM CDT	Severe Thunderstorm Warning	OHX	Perry, Wayne	59 min
Jul 4, 3:06 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence	54 min
Jul 4, 3:24 PM CDT	Severe Thunderstorm Warning	OHX	Giles	66 min
Jul 4, 4:14 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall	31 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2011 Every severe thunderstorm warning in 2011

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.