Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 169, NWS Nashville, TN

May 29, 2012Humphreys County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at May 29, 2012, 5:15 PM CDT for Humphreys County, Tennessee. It was in force for 30 min. 1 report 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: May 29, 2012, 5:15 PM CDT (22:15 UTC)
Expired: May 29, 2012, 5:45 PM CDT
In force: 30 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Humphreys County, TN

What was reported inside it

Time	Report	Where	Remark
May 29, 5:25 PM CDT	TSTM WND DMG	Waverly, TN	TRAIN TRACK GATE BLOWN DOWN IN WAVERLY. TREES DOWN THROUGHOUT WAVERLY.

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 one storm report to this severe thunderstorm warning; the first came 10 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 nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.3 hours before the alert went out and 109 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: 651 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1183 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 124 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.

385 
WUUS54 KOHX 292215
SVROHX
TNC085-292245-
/O.NEW.KOHX.SV.W.0169.120529T2215Z-120529T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
515 PM CDT TUE MAY 29 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN HUMPHREYS COUNTY IN MIDDLE TENNESSEE...

* UNTIL 545 PM CDT

* AT 515 PM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. THE STORM WAS NEAR WAVERLY...MOVING EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WAVERLY...
  MCEWEN...

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 3624 8789 3617 8757 3593 8766 3613 8792
      3618 8793
TIME...MOT...LOC 2215Z 292DEG 28KT 3614 8784

$$

FORECASTER: 31

1 follow-up statement

210 
WWUS54 KOHX 292233
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
533 PM CDT TUE MAY 29 2012

TNC085-292245-
/O.CON.KOHX.SV.W.0169.000000T0000Z-120529T2245Z/
HUMPHREYS TN-
533 PM CDT TUE MAY 29 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHEASTERN
HUMPHREYS COUNTY UNTIL 545 PM CDT...

AT 532 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 MCEWEN...OR 5 MILES EAST OF
WAVERLY...MOVING EAST AT 30 MPH.

LOCATIONS IMPACTED INCLUDE...
  MCEWEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

&&

LAT...LON 3623 8784 3617 8757 3593 8766 3609 8786
TIME...MOT...LOC 2232Z 292DEG 28KT 3609 8769

$$
31

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 May 29, 2:51 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, May 29, 2:51 PM CDT, 2 hours 24 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
251 PM CDT TUE MAY 29 2012

.DISCUSSION...MAIN CONCERNS FOR THIS FORECAST PERIOD ARE
THUNDERSTORM AND SEVERE WX PROBABILITIES...THIS AFTERNOON AND
EVENING...AND ESPECIALLY FOR LATE THURSDAY INTO EARLY FRIDAY.

AT MID AFTERNOON...SCATTERED THUNDERSTORMS WERE OBSERVED OVER THE
PLATEAU...AND MORE THUNDERSTORMS WERE DEVELOPING OVER WEST KY JUST
AHEAD OF A COLD FRONT. ADDITIONAL THUNDERSTORM DEVELOPMENT IS
EXPECTED LATE THIS AFTERNOON THROUGH THE EVENING AS THE FRONT
PUSHES INTO THE WARM AND HUMID AIR ACROSS MID TN. WIDESPREAD
SEVERE WX IS NOT EXPECTED...BUT A FEW STORMS MAY BECOME BRIEFLY
SEVERE WITH LOCALIZED STRONG WIND GUSTS AND VERY HEAVY DOWNPOURS.
THE ACTIVITY SHOULD SETTLE DOWN BY MIDNIGHT. THE OVERNIGHT SETUP
APPEARS PRETTY GOOD FOR SOME PATCHES OF DENSE FOG AS SURFACE WINDS
BECOME LIGHT.

ON WEDNESDAY...THE ATMOSPHERE WILL BECOME DRIER OVER MID TN...BUT WITH
FAIRLY STEEP MID LEVEL LAPSE RATES AND A COUPLE OF WEAK
IMPULSES...ISOLATED THUNDERSTORMS CANNOT BE RULED OUT. SOUNDING
PROFILES SUGGEST POTENTIAL FOR SOME MARGINAL SEVERE HAIL ON
WEDNESDAY IF ANY STRONG UPDRAFTS ARE ABLE TO DEVELOP. TEMPERATURES
ARE EXPECTED TO BE SIMILAR TO TODAY...BUT HUMIDITY LEVELS WILL BE
DOWN SLIGHTLY.

LOOKING AHEAD TO THURSDAY THROUGH FRIDAY...AN USUALLY DEEP LOW
PRESSURE SYSTEM FOR THIS TIME OF YEAR WILL CROSS THE REGION.
THUNDERSTORMS WILL BECOME LIKELY...ESPECIALLY THURSDAY NIGHT. SPC
HAS THE AREA IN A SLIGHT RISK WITH THE MAIN CONCERNS BEING
DAMAGING WINDS AND LARGE HAIL. HEAVY DOWNPOURS SHOULD ALSO BE
EXPECTED. WE WILL HAVE TO WAIT AND SEE HOW ALL THE INGREDIENTS
COME TOGETHER...BUT A SIGNIFICANT OUTBREAK OF SEVERE STORMS WITH
SOME TORNADO POTENTIAL CANNOT BE RULED OUT WITH THIS TYPE OF
SYSTEM.

SHOWERS AND STORMS WILL DIMINISH ON FRIDAY AS MUCH COOLER AND
DRIER AIR MOVES IN. WE WILL HAVE A COUPLE OF COOLER THAN NORMAL
DAYS...WHICH IS PRETTY RARE IN RECENT HISTORY. THE COOL PERIOD WILL
BE BRIEF. RISING HEIGHTS WILL PUMP TEMPERATURES UP AGAIN WELL INTO
THE 80S SUNDAY AND SOME 90S FOR MONDAY. DRY CONDITIONS ARE
EXPECTED FRIDAY NIGHT INTO SATURDAY...BUT THE THREAT FOR AT LEAST
ISOLATED STORMS WILL RETURN AFTER THAT AS A WARM ADVECTION REGIME
DEVELOPS...THEN THE AREA GETS ON THE FRINGE OF NW UPPER LEVEL
FLOW (MCS PATTERN).

13

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      65  90  63  87 /  20  20  10  50
CLARKSVILLE    62  88  61  84 /  20  20  10  50
CROSSVILLE     61  84  58  83 /  50  20  20  50
COLUMBIA       64  91  64  87 /  30  20  20  50
LAWRENCEBURG   64  92  63  86 /  30  20  20  50
WAVERLY        63  90  62  84 /  20  20  20  50

&&

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

&&

Hazardous weather outlook, May 29, 9:09 AM CDT, 8 hours 6 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
909 AM CDT TUE MAY 29 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-301415-
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-
909 AM CDT TUE MAY 29 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WILL DEVELOP ACROSS THE AREA TODAY AND TONIGHT AS A
COLD FRONT APPROACHES. SOME STRONG STORMS ARE EXPECTED...AND A FEW
MAY BECOME SEVERE. HEAVY DOWNPOURS...STRONG WIND GUSTS AND SMALL
HAIL WILL BE POSSIBLE. LOCALIZED FLOODING OF STREETS...SMALL
STREAMS AND LOW LYING AREAS MAY OCCUR.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR MID TENNESSEE
THURSDAY AFTERNOON THROUGH THURSDAY NIGHT. AN USUALLY STRONG LOW
PRESSURE SYSTEM AND COLD FRONT WILL BRING THUNDERSTORMS WITH THE
POTENTIAL FOR DAMAGING WINDS...LARGE HAIL AND HEAVY DOWNPOURS.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS IF ISOLATED SEVERE STORMS MAY BE NEEDED TODAY THROUGH
THIS EVENING. ACTIVATION OF TRAINED SPOTTERS MAY BE NEEDED
THURSDAY AFTERNOON THROUGH THURSDAY NIGHT.

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

13

In the hours before

Special weather statement, May 29, 11:50 AM CDT, 5 hours 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1150 AM CDT TUE MAY 29 2012

TNZ011-034-291730-
FENTRESS-PICKETT-
1150 AM CDT TUE MAY 29 2012

...SIGNIFICANT WEATHER ADVISORY FOR FENTRESS AND EASTERN PICKETT
COUNTIES...

AT 1147 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR JAMESTOWN...MOVING EAST AT 10 MPH.

PENNY SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM.

LAT...LON 3636 8497 3653 8505 3660 8486 3661 8482
      3661 8479 3659 8477 3649 8470 3642 8467

SHAMBURGER

Special weather statement, May 29, 12:01 PM CDT, 5 hours 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
1201 PM CDT TUE MAY 29 2012

TNZ033-034-291745-
FENTRESS-OVERTON-
1201 PM CDT TUE MAY 29 2012

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN FENTRESS AND
SOUTHEASTERN OVERTON COUNTIES...

AT 1156 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 6 MILES NORTH OF MONTEREY...OR 12 MILES SOUTH
OF LIVINGSTON...MOVING EAST AT 15 MPH.

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

LAT...LON 3621 8491 3619 8491 3615 8515 3615 8520
      3619 8527 3618 8528 3620 8532 3622 8533
      3622 8535 3629 8538 3644 8495 3625 8487

SHAMBURGER

Special weather statement, May 29, 1:48 PM CDT, 3 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
148 PM CDT TUE MAY 29 2012

TNZ010-011-033-034-291945-
CLAY-FENTRESS-OVERTON-PICKETT-
148 PM CDT TUE MAY 29 2012

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN
CLAY...FENTRESS...NORTHERN OVERTON AND PICKETT COUNTIES...

AT 143 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES EAST OF
CELINA TO JAMESTOWN...MOVING NORTHEAST AT 20 MPH.

THESE STORMS WILL BE NEAR...
  BYRDSTOWN BY 210 PM CDT.

HALF INCH SIZE HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THESE
STORMS.

LAT...LON 3627 8500 3647 8551 3662 8544 3663 8507
      3661 8479 3649 8470 3643 8469

SHAMBURGER

Special weather statement, May 29, 4:21 PM CDT, 54 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
421 PM CDT TUE MAY 29 2012

TNZ005-006-023-292145-
HOUSTON-MONTGOMERY-STEWART-
421 PM CDT TUE MAY 29 2012

...SIGNIFICANT WEATHER ADVISORY FOR HOUSTON...MONTGOMERY AND STEWART
COUNTIES...

AT 421 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 10 MILES NORTH OF DOVER. THIS STORM WAS SLOWLY
MOVING SOUTHEAST AT 5 TO 10 MPH.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3667 8786 3666 8785 3664 8784 3664 8766
      3655 8740 3632 8756 3656 8802 3667 8795
      3667 8789

31

Special weather statement, May 29, 4:55 PM CDT, 20 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
455 PM CDT TUE MAY 29 2012

TNZ006-007-292230-
MONTGOMERY-ROBERTSON-
455 PM CDT TUE MAY 29 2012

...SIGNIFICANT WEATHER ADVISORY FOR MONTGOMERY AND ROBERTSON
COUNTIES...

AT 454 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR GUTHRIE...OR 11 MILES EAST OF CLARKSVILLE...
MOVING SOUTHEAST AT 30 MPH.

WINDS AROUND 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3665 8686 3647 8701 3656 8721 3664 8713

21

Local storm report, May 29, 5:15 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
515 PM CDT TUE MAY 29 2012

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

0506 PM     TSTM WND DMG     3 NW ADAMS              36.61N 87.10W
05/29/2012                   ROBERTSON          TN   TRAINED SPOTTER

            TREES SNAPPED AND SMALL HAIL REPORTED 3 MILES NW ADAMS.

&&

21

The office that day

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

Issued	Product	Office	Counties	Lasted
May 29, 5:27 AM CDT	Special Weather Statement	OHX	Benton	33 min
May 29, 6:32 AM CDT	Special Weather Statement	OHX	Benton, Houston, Humphreys, Stewart	58 min
May 29, 6:40 AM CDT	Severe Thunderstorm Warning	OHX	Benton	35 min
May 29, 7:15 AM CDT	Severe Thunderstorm Warning	OHX	Benton	30 min
May 29, 7:36 AM CDT	Flash Flood Warning	OHX	Benton	3 hr
May 29, 7:42 AM CDT	Special Weather Statement	OHX	Montgomery, Stewart	63 min
May 29, 8:15 AM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Stewart	18 min
May 29, 11:50 AM CDT	Special Weather Statement	OHX	Fentress	40 min
May 29, 12:01 PM CDT	Special Weather Statement	OHX	Fentress	44 min
May 29, 1:48 PM CDT	Special Weather Statement	OHX	Fentress, Pickett	57 min
May 29, 4:21 PM CDT	Special Weather Statement	OHX	Stewart	24 min
May 29, 4:38 PM CDT	Severe Thunderstorm Warning	OHX	Stewart	11 min
May 29, 4:55 PM CDT	Special Weather Statement	OHX	Robertson	35 min
May 29, 4:57 PM CDT	Severe Thunderstorm Warning	OHX	Montgomery, Robertson	33 min
May 29, 5:08 PM CDT	Severe Thunderstorm Warning	OHX	Dickson, Houston, Montgomery, Stewart	22 min
May 29, 5:22 PM CDT	Special Weather Statement	OHX	Robertson	23 min
May 29, 5:30 PM CDT	Severe Thunderstorm Warning	OHX	Benton, Humphreys	30 min
May 29, 5:43 PM CDT	Special Weather Statement	OHX	Davidson	32 min
May 29, 5:55 PM CDT	Special Weather Statement	OHX	Hickman	35 min
May 29, 6:17 PM CDT	Special Weather Statement	OHX	Williamson	28 min
May 29, 6:30 PM CDT	Severe Thunderstorm Warning	OHX	Rutherford	20 min
May 29, 6:48 PM CDT	Special Weather Statement	OHX	Bedford	27 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.