Alert archive / Tennessee / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 92, NWS Nashville, TN

April 20, 2011Lawrence County, Lewis County, Marshall County, Tennessee

NWS Nashville, TN issued this severe thunderstorm warning at Apr 20, 2011, 3:56 AM CDT for Lawrence County, Lewis County, Marshall County, Tennessee. It was in force for 34 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: Apr 20, 2011, 3:56 AM CDT (08:56 UTC)
Expired: Apr 20, 2011, 4:30 AM CDT
In force: 34 min
Issued by: NWS Nashville, TN
Area: Storm-based polygon

Counties Lawrence County, TN, Lewis County, TN, Marshall County, TN

The radar

The Nashville radar (KOHX), 116 km from the middle of the area, began a volume at 08:57 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.

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 19, 10:14 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 8.9 hours before the alert went out and 103 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: 1997 J/kg
Mixed-layer CIN: -93 J/kg
Mixed-layer LCL: 1626 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 92 m²/s²
0-3 km storm-relative helicity: 239 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

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

629 
WUUS54 KOHX 200856
SVROHX
TNC099-101-117-200930-
/O.NEW.KOHX.SV.W.0092.110420T0856Z-110420T0930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NASHVILLE TN
356 AM CDT WED APR 20 2011

THE NATIONAL WEATHER SERVICE IN NASHVILLE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL MARSHALL COUNTY IN MIDDLE TENNESSEE...
  SOUTHEASTERN LEWIS COUNTY IN MIDDLE TENNESSEE...
  NORTHERN LAWRENCE COUNTY IN MIDDLE TENNESSEE...

* UNTIL 430 AM CDT

* AT 353 AM CDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
  OF 60 MPH. THE STORM WAS NEAR ETHRIDGE...MOVING NORTHEAST AT 55
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHEASTERN LAWRENCE COUNTY...

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 WEDNESDAY MORNING FOR
CENTRAL TENNESSEE. A TORNADO WATCH ALSO REMAINS IN EFFECT UNTIL 900
AM WEDNESDAY MORNING FOR CENTRAL TENNESSEE.

&&

LAT...LON 3523 8747 3539 8757 3552 8726 3545 8729
      3544 8721 3545 8695 3550 8688 3553 8687
      3551 8686 3554 8684 3547 8680 3542 8694
      3545 8696 3544 8721 3532 8722
TIME...MOT...LOC 0856Z 243DEG 47KT 3535 8741

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 20, 12:03 AM CDT	Severe Thunderstorm Warning	OHX	Benton, Dickson, Hickman, Houston, Humphreys, Lewis and 3 more	42 min
Apr 20, 12:21 AM CDT	Tornado Warning	OHX	Stewart	24 min
Apr 20, 12:44 AM CDT	Tornado Warning	OHX	Montgomery, Stewart	31 min
Apr 20, 12:46 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Hickman, Houston, Humphreys and 4 more	44 min
Apr 20, 12:49 AM CDT	Severe Thunderstorm Warning	OHX	Cheatham, Davidson, Dickson, Giles, Hickman, Lawrence and 7 more	41 min
Apr 20, 1:07 AM CDT	Tornado Warning	OHX	Montgomery, Robertson	23 min
Apr 20, 1:28 AM CDT	Severe Thunderstorm Warning	OHX	Davidson, Jackson, Macon, Robertson, Smith, Sumner and 2 more	47 min
Apr 20, 1:30 AM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Davidson, DeKalb, Giles, Lawrence and 7 more	45 min
Apr 20, 1:32 AM CDT	Tornado Warning	OHX	Macon, Robertson, Sumner	18 min
Apr 20, 2:09 AM CDT	Severe Thunderstorm Warning	OHX	Clay, Cumberland, DeKalb, Fentress, Jackson, Macon and 7 more	36 min
Apr 20, 2:11 AM CDT	Severe Thunderstorm Warning	OHX	Bedford, Cannon, Coffee, Cumberland, DeKalb, Giles and 8 more	64 min
Apr 20, 3:11 AM CDT	Severe Thunderstorm Warning	OHX	Coffee, Cumberland, Fentress, Grundy, Overton, Putnam and 3 more	49 min
Apr 20, 3:57 AM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis	33 min
Apr 20, 4:05 AM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Lewis, Maury, Wayne	25 min
Apr 20, 4:12 AM CDT	Areal Flood Advisory	OHX	Lawrence, Lewis, Perry, Wayne	2 hr
Apr 20, 5:58 AM CDT	Severe Thunderstorm Warning	OHX	Giles, Lawrence, Lewis, Maury	22 min
Apr 20, 9:11 AM CDT	River Flood Advisory	OHX	Decatur, Hardin, Perry, Wayne	6 days
Apr 20, 5:32 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	28 min
Apr 20, 5:56 PM CDT	Severe Thunderstorm Warning	OHX	Wayne	19 min
Apr 20, 6:09 PM CDT	Severe Thunderstorm Warning	OHX	Lawrence, Lewis	36 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.