Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 106, NWS Nashville, TN

March 31, 2012Marshall County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Mar 31, 2012, 4:58 PM CDT for Marshall County, Tennessee. It was in force for 32 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: Mar 31, 2012, 4:58 PM CDT (21:58 UTC)
Expired: Mar 31, 2012, 5:30 PM CDT
In force: 32 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

County Marshall County, TN

The radar

The Northeast Alabama radar (KHTX), 82 km from the middle of the area, began a volume at 22:01 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
Mar 31, 5:01 PM CDT	HAIL 1	2 S Lewisburg, TN

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 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
Mar 31, 12:47 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 10.0 hours before the alert went out and 92 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: 1321 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 509 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 96 m²/s²
0-3 km storm-relative helicity: 52 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

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

067 
WUUS54 KOHX 312158
SVROHX
TNC117-312230-
/O.NEW.KOHX.SV.W.0106.120331T2158Z-120331T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
458 PM CDT SAT MAR 31 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN MARSHALL COUNTY IN MIDDLE TENNESSEE...

* UNTIL 530 PM CDT

* AT 458 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 CORNERSVILLE...MOVING SOUTHEAST AT 45
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  CORNERSVILLE

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 900 PM SATURDAY
EVENING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3526 8683 3529 8683 3532 8685 3530 8686
      3532 8690 3534 8690 3537 8692 3541 8692
      3549 8686 3536 8663 3525 8678 3525 8681
TIME...MOT...LOC 2158Z 312DEG 38KT 3532 8677

$$

FORECASTER: 31

1 follow-up statement

010 
WWUS54 KOHX 312226
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
526 PM CDT SAT MAR 31 2012

TNC117-312236-
/O.EXP.KOHX.SV.W.0106.000000T0000Z-120331T2230Z/
MARSHALL TN-
526 PM CDT SAT MAR 31 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARSHALL COUNTY WILL
EXPIRE AT 530 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED
AREA.

LAT...LON 3526 8683 3529 8683 3532 8685 3530 8686
      3532 8690 3534 8690 3537 8692 3541 8692
      3549 8686 3536 8663 3525 8678 3525 8681
TIME...MOT...LOC 2226Z 312DEG 38KT 3512 8650

$$
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 Mar 31, 3:55 PM CDT, 1 hour 3 minutes earlier.

Area forecast discussion, Mar 31, 3:55 PM CDT, 1 hour 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NASHVILLE TN
355 PM CDT SAT MAR 31 2012

.SHORT TERM (THRU MON)...
ONGOING POTENTIAL FOR SVR STORMS WITH VERY LARGE HAIL CONTINUES IN
EXTREME SOUTHERN MID TN. UPDATED WCN TO INCLUDE ALL OF SOUTHERN
AND SOUTHWEST MID TN COUNTIES IN THE SEVERE THUNDERSTORM WATCH
UNDER 9 PM CDT.

REMOVED NORTHERN COUNTIES IN THE WATCH ALONG I-40 CORRIDOR. ISO
STORMS HAVE BEEN DEVELOPING IN THE REGION...BUT CELLS ARE NOT
SEVERE. EXPECT THREAT FOR LARGE HAIL TO DIMINISH IN THE SOUTH THIS
EVENING AFTER SUNSET. PATCHY FOG AFTER MIDNIGHT.

H5 RIDGE/WARMER TEMPS WL MOVE INTO THE REGION SUN-MON. WARMER AIR
ALOFT WILL KEEP SHOWERS AND THUNDERSTORMS ISOLATED THE NEXT COUPLE
OF DAYS...WITH NO ORGANIZED AREAS OF SEVERE WEATHER EXPECTED. THE
BEST CHANCE OF PCPN WL BE IN THE PLATEAU REGION. HIGHS ARE
EXPECTED TO CLIMB INTO THE MID 80S WEST OF PLAT.

.LONG TERM (TUE-FRI)...
H5 LOW PRESSURE MOVES EAST AND DISPLACES RIDGE. A WET PATTERN LOOKS
TO MATERIALIZE WED-THU...WITH SHOWERS AND THUNDERSTORMS LKLY WED.
MODEL SHIFT SYSTEM OUT OF THE AREA FRI WITH DRIER WEATHER FOR THE
WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
NASHVILLE      57  84  62  87 /  10  10   0  20
CLARKSVILLE    55  86  61  86 /  10  10   0  20
CROSSVILLE     50  79  58  81 /  10  20  20  20
COLUMBIA       57  86  61  88 /  20  10   0  20
LAWRENCEBURG   56  86  60  87 /  30  10   0  10
WAVERLY        58  86  61  88 /  10  10   0  20

&&

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

04

Hazardous weather outlook, Mar 31, 11:49 AM CDT, 5 hours 9 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NASHVILLE TN
1149 AM CDT SAT MAR 31 2012

TNZ005>011-022>034-056>066-075-077>080-093>095-011700-
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-
1149 AM CDT SAT MAR 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF MIDDLE
TENNESSEE, WITH THE EXCEPTION OF THOSE AREAS NEAR THE KENTUCKY
STATE LINE AND THE UPPER PLATEAU.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER CALL TO ACTION STATEMENT...

REPORTS FROM TRAINED WEATHER SPOTTERS MAY BE NEEDED.

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

ROSE

In the hours before

Local storm report, Mar 31, 4:00 PM CDT, 58 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
400 PM CDT SAT MAR 31 2012

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

0358 PM     HAIL             8 S PULASKI             35.08N 87.03W
03/31/2012  E1.75 INCH       GILES              TN   TRAINED SPOTTER

&&

11

Local storm report, Mar 31, 4:12 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
412 PM CDT SAT MAR 31 2012

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

0230 PM     HAIL             COLUMBIA                35.62N 87.05W
03/31/2012  M1.25 INCH       MAURY              TN   PUBLIC

0408 PM     HAIL             MINOR HILL              35.04N 87.17W
03/31/2012  M1.50 INCH       GILES              TN   TRAINED SPOTTER

            1.4 INCH HAIL REPORTED IN MINOR HILL

&&

11

Local storm report, Mar 31, 4:17 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
417 PM CDT SAT MAR 31 2012

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

0408 PM     HAIL             3 NE MURFREESBORO       35.88N 86.36W
03/31/2012  E0.50 INCH       RUTHERFORD         TN   TRAINED SPOTTER

            REPORTED NEAR OAKLAND HIGH SCHOOL

&&

11

Local storm report, Mar 31, 4:19 PM CDT, 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
419 PM CDT SAT MAR 31 2012

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

0400 PM     HAIL             WAYNESBORO              35.32N 87.76W
03/31/2012  M1.75 INCH       WAYNE              TN   PUBLIC

&&

11

Local storm report, Mar 31, 4:32 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
432 PM CDT SAT MAR 31 2012

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

0411 PM     HAIL             8 S PULASKI             35.08N 87.03W
03/31/2012  M2.75 INCH       GILES              TN   TRAINED SPOTTER

&&

11

Local storm report, Mar 31, 4:34 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NASHVILLE TN
434 PM CDT SAT MAR 31 2012

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

0410 PM     HAIL             WAYNESBORO              35.32N 87.76W
03/31/2012  M1.25 INCH       WAYNE              TN   PUBLIC

&&

11

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 1:04 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	26 min
Mar 31, 1:15 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Marshall, Maury, Williamson	45 min
Mar 31, 1:25 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Rutherford	35 min
Mar 31, 1:55 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee, Marshall, Maury, Rutherford	35 min
Mar 31, 2:01 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	29 min
Mar 31, 2:08 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, White	17 min
Mar 31, 2:27 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Marshall, Maury	33 min
Mar 31, 2:29 PM CDT	Severe Thunderstorm Warning	OHX	Bedford, Coffee	16 min
Mar 31, 2:35 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	25 min
Mar 31, 2:43 PM CDT	Severe Thunderstorm Warning	OHX	Cumberland, Van Buren, White	17 min
Mar 31, 2:57 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Maury	48 min
Mar 31, 3:18 PM CDT	Flash Flood Warning	OHX	Giles	3 hr
Mar 31, 3:25 PM CDT	Special Weather Statement	OHX	Perry	35 min
Mar 31, 3:31 PM CDT	Severe Thunderstorm Warning	OHX	Perry, Wayne	29 min
Mar 31, 3:41 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	49 min
Mar 31, 3:56 PM CDT	Tornado Warning	OHX	Giles	19 min
Mar 31, 3:58 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	32 min
Mar 31, 4:14 PM CDT	Tornado Warning	OHX	Giles	18 min
Mar 31, 4:23 PM CDT	Severe Thunderstorm Warning	OHX	Marshall, Maury	37 min
Mar 31, 4:28 PM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence	32 min
Mar 31, 4:35 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	25 min
Mar 31, 5:01 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	29 min
Mar 31, 5:12 PM CDT	Severe Thunderstorm Warning	OHX	Marshall	20 min
Mar 31, 5:19 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	26 min
Mar 31, 5:46 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	14 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.