Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 74, NWS Shreveport, LA

May 25, 2011Ouachita Parish, Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at May 25, 2011, 8:31 PM CDT for Ouachita Parish, Union Parish, Louisiana. It was in force for 30 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: May 25, 2011, 8:31 PM CDT (01:31 UTC)
Expired: May 25, 2011, 9:01 PM CDT
In force: 30 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 171 km from the middle of the area, began a volume at 01:31 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
May 25, 8:45 PM CDT	TORNADO	3 E Farmerville, LA	TREES AND POWERLINES DOWN ON TECH DRIVE. TREE ON 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
May 25, 3:16 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.5 hours before the alert went out and 162 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: 1872 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

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

855 
WFUS54 KSHV 260131
TORSHV
LAC073-111-260215-
/O.NEW.KSHV.TO.W.0074.110526T0131Z-110526T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
831 PM CDT WED MAY 25 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHEASTERN OUACHITA PARISH IN NORTH CENTRAL LOUISIANA...
  EAST CENTRAL UNION PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 915 PM CDT

* AT 827 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 14 MILES WEST OF
  STERLINGTON...MOVING EAST AT 25 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LINVILLE...ROCKY BRANCH...HAILE...SPENCER...LOCH LOMON...DESHARD...
  PERRYVILLE...GUTHRIE AND FAIRBANKS.

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 3263 9192 3267 9236 3284 9237 3286 9207
      3280 9205 3272 9206 3271 9204 3271 9197
      3267 9194 3267 9192 3265 9191
TIME...MOT...LOC 0131Z 271DEG 16KT 3274 9228

$$

06

2 follow-up statements

024 
WWUS54 KSHV 260155
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
855 PM CDT WED MAY 25 2011

LAC073-260204-
/O.CAN.KSHV.TO.W.0074.000000T0000Z-110526T0215Z/
OUACHITA LA-
855 PM CDT WED MAY 25 2011

...THE TORNADO WARNING FOR OUACHITA PARISH IS CANCELLED...

LAT...LON 3274 9205 3274 9206 3273 9205 3272 9207
      3272 9215 3285 9217 3286 9207 3280 9205
TIME...MOT...LOC 0154Z 260DEG 24KT 3281 9205

$$

LAC111-260215-
/O.CON.KSHV.TO.W.0074.000000T0000Z-110526T0215Z/
UNION LA-
855 PM CDT WED MAY 25 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 915 PM CDT FOR UNION
PARISH...

AT 853 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED 6 MILES EAST OF HAILE...OR 9 MILES WEST OF BASTROP...MOVING
EAST AT 30 MPH.

LAT...LON 3274 9205 3274 9206 3273 9205 3272 9207
      3272 9215 3285 9217 3286 9207 3280 9205
TIME...MOT...LOC 0154Z 260DEG 24KT 3281 9205

$$

06

437 
WWUS54 KSHV 260201
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
901 PM CDT WED MAY 25 2011

LAC111-260210-
/O.CAN.KSHV.TO.W.0074.000000T0000Z-110526T0215Z/
UNION LA-
901 PM CDT WED MAY 25 2011

...THE TORNADO WARNING FOR UNION PARISH IS CANCELLED...

THE THUNDERSTORM THAT WAS SEVERE EARLIER AND WAS CAPABLE OF 
PRODUCING A TORNADO...HAS WEAKENED AND MOVED OUT OF THE AREA.

LAT...LON 3274 9205 3274 9206 3273 9205 3272 9207
      3272 9215 3285 9217 3286 9207 3280 9205
TIME...MOT...LOC 0200Z 254DEG 26KT 3283 9197

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
May 25, 7:14 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	61 min
May 25, 7:28 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Ouachita, Union	62 min
May 25, 7:42 PM CDT	Tornado Warning	SHV	Lincoln, Union	48 min
May 25, 8:03 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Claiborne, Jackson, Lincoln, Ouachita and 2 more	57 min
May 25, 8:54 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, De Soto, Grant, Jackson, LaSalle and 4 more	66 min
May 25, 9:13 PM CDT	Tornado Warning	SHV	De Soto, Natchitoches, Red River, Sabine	32 min
May 25, 9:45 PM CDT	Tornado Warning	SHV	Natchitoches, Sabine	30 min
May 25, 9:57 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, LaSalle, Winn	39 min
May 25, 10:16 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	44 min
May 25, 11:06 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches	39 min

Nearby

Tornado Warnings in Louisiana, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.