Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 87, NWS Shreveport, LA

November 8, 2011Smith County, Texas

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 2:36 PM CST for Smith County, Texas. It was in force for 11 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: Nov 8, 2011, 2:36 PM CST (20:36 UTC)
Expired: Nov 8, 2011, 2:47 PM CST
In force: 11 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Smith County, TX

The radar

The Shreveport radar (KSHV), 118 km from the middle of the area, began a volume at 20:36 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
Nov 8, 10:49 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.6 hours before the alert went out and 126 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: 12 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 496 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 361 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

168 
WFUS54 KSHV 082036
TORSHV
TXC423-082100-
/O.NEW.KSHV.TO.W.0087.111108T2036Z-111108T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
236 PM CST TUE NOV 8 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL SMITH COUNTY IN NORTHEAST TEXAS...

* UNTIL 300 PM CST

* AT 231 PM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO OVER SMITH
  COUNTY...OR 9 MILES NORTHEAST OF TYLER...MOVING EAST AT 35 MPH.

* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
  INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 3247 9523 3252 9502 3252 9499 3241 9498
      3240 9499 3239 9523
TIME...MOT...LOC 2036Z 257DEG 29KT 3245 9517

$$

23

1 follow-up statement

163 
WWUS54 KSHV 082047
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
247 PM CST TUE NOV 8 2011

TXC423-082058-
/O.CAN.KSHV.TO.W.0087.000000T0000Z-111108T2100Z/
SMITH TX-
247 PM CST TUE NOV 8 2011

...THE TORNADO WARNING FOR SMITH COUNTY IS CANCELLED...

LAT...LON 3247 9523 3252 9502 3252 9499 3241 9498
      3240 9499 3239 9523
TIME...MOT...LOC 2048Z 257DEG 29KT 3247 9506

$$

23

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 8, 1:13 PM CST	Tornado Warning	SHV	Cherokee, Nacogdoches	32 min
Nov 8, 1:43 PM CST	Tornado Warning	SHV	Nacogdoches, Rusk	47 min
Nov 8, 1:47 PM CST	Severe Thunderstorm Warning	SHV	Camp, Franklin, Smith, Upshur, Wood	58 min
Nov 8, 2:14 PM CST	Tornado Warning	SHV	Smith, Upshur, Wood	31 min
Nov 8, 2:27 PM CST	Tornado Warning	SHV	Panola, Rusk, Shelby	11 min
Nov 8, 2:42 PM CST	Tornado Warning	SHV	Smith, Upshur	21 min
Nov 8, 3:00 PM CST	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Rusk, Smith	45 min
Nov 8, 3:02 PM CST	Severe Thunderstorm Warning	SHV	Camp, Cass, Gregg, Harrison, Marion, Morris and 1 more	43 min
Nov 8, 3:21 PM CST	Tornado Warning	SHV	Nacogdoches, Panola, Rusk	24 min
Nov 8, 3:58 PM CST	Severe Thunderstorm Warning	SHV	Panola, Shelby	47 min
Nov 8, 4:30 PM CST	Tornado Warning	SHV	Panola, Shelby	30 min

Nearby

Tornado Warnings in Texas, 2011 Every tornado warning in 2011 Tornadoes 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.