Alert archive / Louisiana / Tornado Warnings in 2012

Tornado Warning 31, NWS Shreveport, LA

April 5, 2012Ouachita Parish, Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 5, 2012, 5:14 AM CDT for Ouachita Parish, Union Parish, Louisiana. It was in force for 31 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: Apr 5, 2012, 5:14 AM CDT (10:14 UTC)
Expired: Apr 5, 2012, 5:45 AM CDT
In force: 31 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 174 km from the middle of the area, began a volume at 10:16 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
Apr 5, 5:38 AM CDT	HAIL 1	Sterlington, LA

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
Apr 5, 1:53 AM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 10.2 hours before the alert went out and 165 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: 439 J/kg
Mixed-layer CIN: -39 J/kg
Mixed-layer LCL: 1639 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

561 
WFUS54 KSHV 051014
TORSHV
LAC073-111-051045-
/O.NEW.KSHV.TO.W.0031.120405T1014Z-120405T1045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
514 AM CDT THU APR 5 2012

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN OUACHITA PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITY OF SWARTZ...
  SOUTHEASTERN UNION PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 545 AM CDT

* AT 512 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
  STERLINGTON...OR 12 MILES NORTH OF CLAIBORNE...MOVING EAST AT 45
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  DESHARD...FAIRBANKS...GUTHRIE AND PERRYVILLE.

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 3261 9192 3255 9192 3263 9226 3283 9220
      3281 9205 3272 9206 3271 9204 3271 9197
      3267 9194 3267 9192 3266 9191
TIME...MOT...LOC 1014Z 283DEG 41KT 3271 9211

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 5, 12:49 AM CDT	Severe Thunderstorm Warning	SHV	Union	56 min
Apr 5, 1:07 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Union	53 min
Apr 5, 1:27 AM CDT	Tornado Warning	SHV	Lincoln, Ouachita, Union	48 min
Apr 5, 2:37 AM CDT	Severe Thunderstorm Warning	SHV	Ouachita	38 min
Apr 5, 4:03 AM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	57 min
Apr 5, 5:30 AM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	60 min

Nearby

Tornado Warnings in Louisiana, 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.