Alert archive / Texas / Tornado Warnings in 2012

Tornado Warning 38, NWS Shreveport, LA

December 25, 2012Angelina County, Cherokee County, Texas

NWS Shreveport, LA issued this tornado warning at Dec 25, 2012, 9:42 AM CST for Angelina County, Cherokee County, Texas. It was in force for 18 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: Dec 25, 2012, 9:42 AM CST (15:42 UTC)
Expired: Dec 25, 2012, 10:00 AM CST
In force: 18 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Angelina County, TX, Cherokee County, TX

The radar

The Shreveport radar (KSHV), 150 km from the middle of the area, began a volume at 15:42 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
Dec 25, 10:09 AM CST	HAIL 1	11 Nw Lufkin, TX	NICKEL TO QUARTER SIZE HAIL AT OBSERVER RESIDENCE

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
Dec 25, 9:02 AM CST	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 3.7 hours before the alert went out and 225 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: 1505 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 500 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 265 m²/s²
0-3 km storm-relative helicity: 353 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 10.9

Open this sounding in Storm Lab

The text

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

177 
WFUS54 KSHV 251542
TORSHV
TXC005-073-251615-
/O.NEW.KSHV.TO.W.0038.121225T1542Z-121225T1615Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
942 AM CST TUE DEC 25 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN ANGELINA COUNTY IN EASTERN TEXAS...
  SOUTHEASTERN CHEROKEE COUNTY IN NORTHEAST TEXAS...

* UNTIL 1015 AM CST

* AT 937 AM CST...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR WELLS...OR
  17 MILES WEST OF LUFKIN...MOVING NORTHEAST AT 45 MPH.

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

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 3136 9497 3139 9496 3144 9502 3147 9509
      3164 9496 3159 9492 3158 9492 3156 9489
      3155 9490 3148 9482 3135 9493
TIME...MOT...LOC 1542Z 220DEG 46KT 3147 9495

$$

1 follow-up statement

308 
WWUS54 KSHV 251600
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1000 AM CST TUE DEC 25 2012

TXC005-073-251607-
/O.CAN.KSHV.TO.W.0038.000000T0000Z-121225T1615Z/
CHEROKEE TX-ANGELINA TX-
1000 AM CST TUE DEC 25 2012

...THE TORNADO WARNING FOR ANGELINA AND CHEROKEE COUNTIES IS
CANCELLED...

THE THUNDERSTORM WHICH CONTAINED THE POSSIBLE TORNADO HAS WEAKEN 
AND MOVED INTO NACOGDOCHES COUNTY. RADAR NO LONGER INDICATES A 
TORNADO. 

LAT...LON 3136 9497 3139 9496 3144 9502 3147 9509
      3164 9496 3159 9492 3158 9492 3156 9489
      3155 9490 3148 9482 3135 9493
TIME...MOT...LOC 1557Z 220DEG 46KT 3162 9480

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 25, 1:39 AM CST	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	28 hr
Dec 25, 2:30 AM CST	Winter Storm Warning	SHV	Bowie, Red River	19 hr
Dec 25, 3:21 AM CST	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Panola, Rusk, Smith	42 min
Dec 25, 5:04 AM CST	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris	41 min
Dec 25, 10:12 AM CST	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	33 min
Dec 25, 10:37 AM CST	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, San Augustine, Shelby	38 min
Dec 25, 11:00 AM CST	Severe Thunderstorm Warning	SHV	Sabine	45 min

Nearby

Tornado Warnings in Texas, 2012 Every tornado warning in 2012 Tornadoes 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.