Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 311, NWS Nashville, TN

August 1, 2012Davidson County, Williamson County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Aug 1, 2012, 5:29 PM CDT for Davidson County, Williamson County, Tennessee. It was in force for 46 min. 5 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Aug 1, 2012, 5:29 PM CDT (22:29 UTC)
Expired: Aug 1, 2012, 6:15 PM CDT
In force: 46 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Davidson County, TN, Williamson County, TN

The radar

The Nashville radar (KOHX), 27 km from the middle of the area, began a volume at 22:32 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.

What was reported inside it

Time	Report	Where	Remark
Aug 1, 5:32 PM CDT	TSTM WND DMG	2 N Belle Meade, TN	MULTIPLE TREES AND POWER LINES DOWN IN BORDEAUX.
Aug 1, 5:39 PM CDT	TSTM WND DMG	2 N Belle Meade, TN	MULTIPLE TREES AND POWER LINES DOWN IN BORDEAUX.
Aug 1, 5:47 PM CDT	TSTM WND DMG	1 Se Nashville, TN	SIZEABLE BRANCH RIPPED OFF TREE NEAR MUSIC ROW.
Aug 1, 5:50 PM CDT	TSTM WND DMG	3 N Brentwood, TN	NUMEROUS TREE REPORTED DOWN IN CRIEVE HALL ALONG BLACKMAN ROAD
Aug 1, 5:55 PM CDT	TSTM WND DMG	3 N Brentwood, TN	IN CRIEVE HALL...A COUPLE OF HOUSES WITH FALLEN TREES ON THEM...NO INJURIES. DOWNED POWER LINES IN THE ROAD.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 5 storm reports to this severe thunderstorm warning; the first came 3 minutes after it went out.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 1, 2:40 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.5 hours before the alert went out and 20 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: 1698 J/kg
Mixed-layer CIN: -98 J/kg
Mixed-layer LCL: 1123 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 114 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

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

233 
WUUS54 KOHX 012229
SVROHX
TNC037-187-012315-
/O.NEW.KOHX.SV.W.0311.120801T2229Z-120801T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
529 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTH CENTRAL WILLIAMSON COUNTY IN MIDDLE TENNESSEE...
  DAVIDSON COUNTY IN MIDDLE TENNESSEE...

* UNTIL 615 PM CDT

* AT 527 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 BELLE
  MEADE...MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  BELLE MEADE...
  FOREST HILLS...
  OAK HILL...
  BRENTWOOD...

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.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM WEDNESDAY
EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3613 8653 3589 8675 3611 8702 3613 8700
      3620 8699 3629 8690
TIME...MOT...LOC 2230Z 307DEG 13KT 3616 8691

$$

FORECASTER:BOYD

1 follow-up statement

141 
WWUS54 KOHX 012256
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
556 PM CDT WED AUG 1 2012

TNC037-187-012315-
/O.CON.KOHX.SV.W.0311.000000T0000Z-120801T2315Z/
WILLIAMSON TN-DAVIDSON TN-
556 PM CDT WED AUG 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
DAVIDSON AND NORTHEASTERN WILLIAMSON COUNTIES UNTIL 615 PM CDT...

AT 554 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED NEAR BELLE MEADE...OR NEAR 
NASHVILLE...MOVING SOUTHEAST AT 15 MPH. THE WEATHER SERVICE IN 
NASHVILLE HAS RECEIVED SEVERAL REPORTS OF DAMAGE ASSOCIATED WITH 
THIS STORM. 

LOCATIONS IMPACTED INCLUDE...
  FOREST HILLS...OAK HILL...BRENTWOOD AND BERRY HILL.

LAT...LON 3613 8653 3589 8675 3607 8690 3614 8687
      3621 8674
TIME...MOT...LOC 2255Z 307DEG 13KT 3611 8682

$$

BOYD

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 1, 3:42 PM CDT, 1 hour 47 minutes earlier.

Area forecast discussion, Aug 1, 3:42 PM CDT, 1 hour 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
342 PM CDT WED AUG 1 2012

.SHORT TERM (THRU THU)...
COUPLE OF H5 S/W TROF'S GENERATING ORGANIZED AREA OF STORMS THIS
AFTN. SYSTEM TO THE NORTH APPROACHING TN-KY LINE WORKING WITH A
FNTL BDRY TO CREATE A BROKEN LINE OF STORMS MOVG SOUTH...WITH A
SEVERE THUNDERSTORM WATCH ACROSS MUCH OF MID-TN UNTIL 10 PM CDT.

THE SECOND SYSTEM WITH STRONGER H5 S/W WL MOVE SOUTHEAST AND
GENERALLY IMPACT AREAS SOUTHWEST OF MID-TN. ANOTHER SYSTEM MAY
DEVELOP FURTHER WEST THIS EVENING WITH A SIMILAR TRACK...KEEPING
THE BULK OF ACTIVITY SOUTH OF MID-TN. AFTER THE STORMS DIE DOWN
LATER TNGT...EXPECT TO SEE SOME PATCHY FOG.

THU...NORTHWEST FLOW ALOFT CONTINUES WITH VERY WARM TEMPS. MODELS
SHOW LITTLE IF ANY STORM ACTIVITY...BUT DESTAB PARMS SHOW POTENTIAL
FOR ISOLATED STORMS WITH SHOWALTERS TO -3. IN TERMS OF HEAT...HEAT
INDICES LOOK TO REACH THE 100 TO 105 DEGREE RANGE. MOST LOCATIONS
WL REMAIN BELOW HEAT ADVISORY CRITERIA OF 105...SO WL PUSH OUT
ANOTHER SPS FOR HEAT THU.

.LONG TERM (FRI-WED)...
ACTIVE NORTHWEST FLOW PATTERN WL CONTINUE ALOFT WITH STORM SYSTEMS
EXPECTED TO AFFECT THE AREA PERIODICALLY FRI-MON. THE FIRST SYSTEM
LOOKS TO ARRIVE ON FRI...WITH SHOWERS AND THUNDERSTORMS LKLY. STORMS
ARE ALSO LKLY SUNDAY.

A COLD FRONT WL APPROACH AND POSSIBLY MOVE INTO THE AREA EARLY NEXT
WEEK. LONG-TERM MODELS SHOW SOME DRIER AIR MOVING INTO THE REGION
BEHIND THE SYSTEM...AND WL GO WITH LESS CLOUDS AND DROP THE CHANCE
OF RAIN AFTER MONDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      72  98  74  92 /  40  20  20  70
CLARKSVILLE    71  96  72  90 /  40  20  30  60
CROSSVILLE     68  91  69  87 /  40  20  20  60
COLUMBIA       72  98  74  92 /  20  20  20  60
LAWRENCEBURG   72  97  73  93 /  20  20  20  50
WAVERLY        71  97  73  91 /  40  20  30  60

&&

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

04

Hazardous weather outlook, Aug 1, 5:07 AM CDT, 12 hours 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
507 AM CDT WED AUG 1 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-021030-
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-
507 AM CDT WED AUG 1 2012

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...THURSDAY THROUGH TUESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

ROSE

In the hours before

Local storm report, Aug 1, 5:11 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NASHVILLE TN
511 PM CDT WED AUG 01 2012

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

0340 PM     HAIL             CROSSVILLE              35.95N 85.04W
08/01/2012  U0.88 INCH       CUMBERLAND         TN   PUBLIC

            0.88 INCH HAIL REPORTED IN CROSSVILLE

0345 PM     HAIL             7 NW LIVINGSTON         36.46N 85.42W
08/01/2012  E1.00 INCH       OVERTON            TN   PUBLIC

0415 PM     HAIL             2 S BYRDSTOWN           36.55N 85.13W
08/01/2012  M0.88 INCH       PICKETT            TN   TRAINED SPOTTER

0504 PM     HAIL             7 NE DOVER              36.55N 87.75W
08/01/2012  E1.00 INCH       STEWART            TN   EMERGENCY MNGR

            ALSO ESTIMATED WINDS AT 65MPH.

&&

31

Local storm report, Aug 1, 5:12 PM CDT, 17 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
512 PM CDT WED AUG 01 2012

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

0440 PM     TSTM WND DMG     6 WSW COLLINWOOD        35.14N 87.84W
08/01/2012                   WAYNE              TN   EMERGENCY MNGR

            TREES DOWN IN THE TOWN OF LUTTS.

&&

AL

Local storm report, Aug 1, 5:13 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NASHVILLE TN
513 PM CDT WED AUG 01 2012

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

0340 PM     HAIL             CROSSVILLE              35.95N 85.04W
08/01/2012  U0.88 INCH       CUMBERLAND         TN   PUBLIC

            0.88 INCH HAIL REPORTED IN CROSSVILLE

0345 PM     HAIL             7 NW LIVINGSTON         36.46N 85.42W
08/01/2012  E1.00 INCH       OVERTON            TN   PUBLIC

0415 PM     HAIL             2 S BYRDSTOWN           36.55N 85.13W
08/01/2012  M0.88 INCH       PICKETT            TN   TRAINED SPOTTER

0440 PM     TSTM WND DMG     6 WSW COLLINWOOD        35.14N 87.84W
08/01/2012                   WAYNE              TN   EMERGENCY MNGR

            TREES DOWN IN THE TOWN OF LUTTS.

0504 PM     HAIL             7 NE DOVER              36.55N 87.75W
08/01/2012  E1.00 INCH       STEWART            TN   EMERGENCY MNGR

            ALSO ESTIMATED WINDS AT 65MPH.

&&

31

Local storm report, Aug 1, 5:25 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
525 PM CDT WED AUG 01 2012

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

0508 PM     TSTM WND DMG     7 E DOVER               36.48N 87.72W
08/01/2012                   STEWART            TN   LAW ENFORCEMENT

            TREES DOWN AROUND THE INDIAN MOUND COMMUNITY IN STEWART
            COUNTY.

&&

11

Special weather statement, Aug 1, 5:25 PM CDT, 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
525 PM CDT WED AUG 1 2012

TNZ027-012315-
DAVIDSON-
525 PM CDT WED AUG 1 2012

...SIGNIFICANT WEATHER ADVISORY FOR DAVIDSON COUNTY...

AT 522 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES NORTHWEST OF BELLE MEADE...OR 9 MILES
WEST OF NASHVILLE...MOVING EAST AT 30 MPH.

THIS STORM WILL BE NEAR...
  5 MILES NORTH OF BELLE MEADE BY 535 PM CDT.
  NASHVILLE BY 540 PM CDT.
  5 MILES NORTH OF OAK HILL BY 545 PM CDT.

SMALL HAIL...AND WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM.

PEOPLE IN DAVIDSON COUNTY...INCLUDING THE CITIES OF BELLE MEADE...
NASHVILLE AND OAK HILL...SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. LISTEN FOR POSSIBLE WARNINGS AND BE PREPARED TO TAKE
APPROPRIATE ACTION SHOULD SEVERE WEATHER THREATEN.

LAT...LON 3629 8664 3626 8664 3625 8662 3615 8657
      3602 8659 3601 8662 3597 8661 3611 8701
      3613 8700 3624 8698 3630 8694

AL

Local storm report, Aug 1, 5:26 PM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NASHVILLE TN
526 PM CDT WED AUG 01 2012

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

0340 PM     HAIL             CROSSVILLE              35.95N 85.04W
08/01/2012  U0.88 INCH       CUMBERLAND         TN   PUBLIC

            0.88 INCH HAIL REPORTED IN CROSSVILLE

0345 PM     HAIL             7 NW LIVINGSTON         36.46N 85.42W
08/01/2012  E1.00 INCH       OVERTON            TN   PUBLIC

0415 PM     HAIL             2 S BYRDSTOWN           36.55N 85.13W
08/01/2012  M0.88 INCH       PICKETT            TN   TRAINED SPOTTER

0440 PM     TSTM WND DMG     6 WSW COLLINWOOD        35.14N 87.84W
08/01/2012                   WAYNE              TN   EMERGENCY MNGR

            TREES DOWN IN THE TOWN OF LUTTS.

0504 PM     HAIL             7 NE DOVER              36.55N 87.75W
08/01/2012  E1.00 INCH       STEWART            TN   EMERGENCY MNGR

            ALSO ESTIMATED WINDS AT 65MPH.

0508 PM     TSTM WND DMG     7 E DOVER               36.48N 87.72W
08/01/2012                   STEWART            TN   LAW ENFORCEMENT

            TREES DOWN AROUND THE INDIAN MOUND COMMUNITY IN STEWART
            COUNTY.

&&

31

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 1:54 AM CDT	Special Weather Statement	OHX	Davidson	36 min
Aug 1, 1:32 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	58 min
Aug 1, 1:51 PM CDT	Severe Thunderstorm Warning	OHX	Fentress, Overton, Pickett	24 min
Aug 1, 2:18 PM CDT	Special Weather Statement	OHX	Fentress	27 min
Aug 1, 2:55 PM CDT	Special Weather Statement	OHX	Fentress, Overton, Pickett	50 min
Aug 1, 3:20 PM CDT	Special Weather Statement	OHX	Sumner	40 min
Aug 1, 3:28 PM CDT	Special Weather Statement	OHX	Cumberland	32 min
Aug 1, 3:35 PM CDT	Special Weather Statement	OHX	Overton	40 min
Aug 1, 3:35 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland	25 min
Aug 1, 3:42 PM CDT	Special Weather Statement	OHX	Jackson	48 min
Aug 1, 3:43 PM CDT	Severe Thunderstorm Warning	OHX	Clay, Jackson, Overton, Putnam	32 min
Aug 1, 3:58 PM CDT	Severe Thunderstorm Warning	OHX	Macon, Sumner, Trousdale	29 min
Aug 1, 4:02 PM CDT	Special Weather Statement	OHX	Cumberland	28 min
Aug 1, 4:12 PM CDT	Special Weather Statement	OHX	Montgomery	48 min
Aug 1, 4:24 PM CDT	Special Weather Statement	OHX	Overton	36 min
Aug 1, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	40 min
Aug 1, 4:36 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	54 min
Aug 1, 5:03 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Wayne	27 min
Aug 1, 5:22 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Humphreys, Montgomery, Stewart	53 min
Aug 1, 5:25 PM CDT	Special Weather Statement	OHX	Davidson	50 min
Aug 1, 5:45 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	30 min
Aug 1, 6:06 PM CDT	Special Weather Statement	OHX	Cheatham	39 min
Aug 1, 6:08 PM CDT	Special Weather Statement	OHX	Coffee, Grundy	52 min
Aug 1, 6:09 PM CDT	Severe Thunderstorm Warning	OHX	Davidson, Rutherford, Wilson	36 min
Aug 1, 6:12 PM CDT	Special Weather Statement	OHX	Maury	48 min
Aug 1, 6:15 PM CDT	Special Weather Statement	OHX	Giles	45 min
Aug 1, 6:19 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Lewis, Maury	26 min
Aug 1, 6:31 PM CDT	Severe Thunderstorm Warning	OHX	Coffee, Grundy	44 min
Aug 1, 6:34 PM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Williamson	41 min
Aug 1, 6:41 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Hickman	34 min
Aug 1, 6:43 PM CDT	Severe Thunderstorm Warning	OHX	Hickman, Maury	12 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.