Alert archive / Tennessee / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 4, NWS Nashville, TN

January 21, 2012Giles County, Lawrence County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Jan 21, 2012, 4:15 AM CST for Giles County, Lawrence County, Tennessee. It was in force for 33 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: Jan 21, 2012, 4:15 AM CST (10:15 UTC)
Expired: Jan 21, 2012, 4:48 AM CST
In force: 33 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Giles County, TN, Lawrence County, TN

The radar

The Northeast Alabama radar (KHTX), 89 km from the middle of the area, began a volume at 10:17 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
Jan 21, 4:24 AM CST	HAIL 0.88	10 S Pulaski, TN	TRAINED SPOTTER REPORTED NICKEL SIZED HAIL 10 S PULASKI. HAIL WAS ONGOING DURING REPORT.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Jan 20, 10:35 PM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 10.3 hours before the alert went out and 108 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 550 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 385 m²/s²
0-3 km storm-relative helicity: 504 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.

422 
WUUS54 KOHX 211015
SVROHX
TNC055-099-211100-
/O.NEW.KOHX.SV.W.0004.120121T1015Z-120121T1100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
415 AM CST SAT JAN 21 2012

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GILES COUNTY IN MIDDLE TENNESSEE...
  SOUTHEASTERN LAWRENCE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 500 AM CST

* AT 412 AM CST 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 EAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PULASKI...

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 TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM SATURDAY MORNING FOR
CENTRAL TENNESSEE.

&&

LAT...LON 3500 8731 3521 8731 3530 8706 3531 8689
      3530 8686 3532 8686 3532 8685 3529 8683
      3526 8682 3502 8683
TIME...MOT...LOC 1015Z 264DEG 27KT 3511 8722

$$

FORECASTER:BOYD

4 follow-up statements

146 
WWUS54 KOHX 211026
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
426 AM CST SAT JAN 21 2012

TNC099-211035-
/O.CAN.KOHX.SV.W.0004.000000T0000Z-120121T1100Z/
LAWRENCE TN-
426 AM CST SAT JAN 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LAWRENCE COUNTY
IS CANCELLED...

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

LAT...LON 3507 8722 3513 8720 3516 8720 3517 8722
      3521 8721 3521 8722 3524 8722 3530 8706
      3531 8689 3530 8686 3532 8685 3526 8682
      3502 8683 3500 8722
TIME...MOT...LOC 1025Z 264DEG 27KT 3512 8713

$$

TNC055-211100-
/O.CON.KOHX.SV.W.0004.000000T0000Z-120121T1100Z/
GILES TN-
426 AM CST SAT JAN 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR GILES COUNTY
UNTIL 500 AM CST...

AT 422 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 9 MILES SOUTHWEST OF PULASKI...MOVING
EAST AT 30 MPH. NICKEL SIZE HAIL WAS REPORTED 8 MILES SOUTH OF 
PULASKI AT 424 AM CST. 

LOCATIONS IMPACTED INCLUDE...
  PULASKI AND ELKTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3507 8722 3513 8720 3516 8720 3517 8722
      3521 8721 3521 8722 3524 8722 3530 8706
      3531 8689 3530 8686 3532 8685 3526 8682
      3502 8683 3500 8722
TIME...MOT...LOC 1025Z 264DEG 27KT 3512 8713

$$

BOYD

995 
WWUS54 KOHX 211033
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
433 AM CST SAT JAN 21 2012

TNC055-211100-
/O.CON.KOHX.SV.W.0004.000000T0000Z-120121T1100Z/
GILES TN-
433 AM CST SAT JAN 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CENTRAL GILES
COUNTY UNTIL 500 AM CST...

AT 431 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF PULASKI...MOVING
EAST AT 30 MPH. NICKEL SIZE OCCURRED 10 SOUTH OF PULASKI AT 424 AM 
CST. 

LOCATIONS IMPACTED INCLUDE...
  PULASKI AND ELKTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3505 8710 3507 8715 3511 8714 3515 8716
      3515 8715 3520 8713 3523 8715 3523 8712
      3527 8707 3531 8689 3530 8686 3532 8685
      3526 8682 3502 8683
TIME...MOT...LOC 1033Z 264DEG 27KT 3512 8706

$$

BOYD

387 
WWUS54 KOHX 211040
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
440 AM CST SAT JAN 21 2012

TNC055-211100-
/O.CON.KOHX.SV.W.0004.000000T0000Z-120121T1100Z/
GILES TN-
440 AM CST SAT JAN 21 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EAST CENTRAL
GILES COUNTY UNTIL 500 AM CST...

AT 436 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF
60 MPH.  THIS STORM WAS LOCATED 6 MILES SOUTHEAST OF PULASKI...MOVING
EAST AT 35 MPH. LARGE HAIL HAS BEEN REPORTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  ELKTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. TORNADOES CAN
DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH NOT IMMEDIATELY
LIKELY...IF A TORNADO IS SPOTTED ACT QUICKLY AND MOVE TO A PLACE OF
SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL
INTERIOR ROOM.

&&

LAT...LON 3504 8702 3505 8703 3513 8706 3504 8702
      3510 8702 3513 8705 3524 8701 3531 8689
      3530 8686 3532 8685 3526 8682 3502 8683
TIME...MOT...LOC 1039Z 262DEG 31KT 3515 8692

$$

BOYD

777 
WWUS54 KOHX 211048
SVSOHX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NASHVILLE TN
448 AM CST SAT JAN 21 2012

TNC055-211057-
/O.CAN.KOHX.SV.W.0004.000000T0000Z-120121T1100Z/
GILES TN-
448 AM CST SAT JAN 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL GILES COUNTY IS
CANCELLED...

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

LAT...LON 3504 8702 3505 8703 3513 8706 3504 8702
      3510 8702 3513 8705 3524 8701 3531 8689
      3530 8686 3532 8685 3526 8682 3502 8683
TIME...MOT...LOC 1047Z 262DEG 32KT 3515 8677

$$

BOYD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 12:40 AM CST	Tornado Warning	OHX	Hickman, Lewis, Maury, Williamson	35 min
Jan 21, 2:29 AM CST	Special Weather Statement	OHX	Cannon	31 min
Jan 21, 3:17 AM CST	Special Weather Statement	OHX	Cannon	58 min
Jan 21, 3:38 AM CST	Special Weather Statement	OHX	Wayne	52 min
Jan 21, 3:50 AM CST	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Wayne	25 min
Jan 21, 3:50 PM CST	Wind Advisory	OHX	Bedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more	36 hr
Jan 21, 5:02 PM CST	Dense Fog Advisory	OHX	Bedford, Benton, Cannon, Cheatham, Clay, Coffee and 33 more	19 hr

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.