Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 76, NWS Shreveport, LA

May 25, 2011Natchitoches Parish, Sabine Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at May 25, 2011, 9:45 PM CDT for Natchitoches Parish, Sabine Parish, Louisiana. It was in force for 30 min. 5 reports 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, 9:45 PM CDT (02:45 UTC)
Expired: May 25, 2011, 10:15 PM CDT
In force: 30 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Natchitoches Parish, LA, Sabine Parish, LA

What was reported inside it

Time	Report	Where	Remark
May 25, 10:01 PM CDT	HAIL 0.5	7 Nw Natchitoches, LA	ADJACENT TO SIBLEY LAKE
May 25, 10:03 PM CDT	HAIL 1.75	12 Nw Natchitoches, LA	ONE MILE SOUTHEAST OF ALLEN.
May 25, 10:20 PM CDT	HAIL 1	Natchitoches, LA
May 25, 10:22 PM CDT	TORNADO	1 Ne Natchez, LA	AN EF0 TORNADO TOUCHED DOWN ONE MILE NORTHEAST OF NATCHEZ AND MOVED NORTH-NORTHEAST IN PARALLEL TO FISH HATCHERY ROAD. THE TORNADO RIPPED THE TOPS OFF SEVERAL TREES...KNOCKED SEVERAL LARGE LIMBS DOWN...AND BROKE NUMEROUS SMALL LIMBS OFF TREES ALL ALONG THE PAT
May 25, 10:24 PM CDT	HAIL 1.25	5 N Natchitoches, 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
May 25, 3:16 PM CDT	Tornado Watch	SPC	7 hr
May 25, 9:43 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.8 hours before the alert went out and 90 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.

775 
WFUS54 KSHV 260245
TORSHV
LAC069-085-260315-
/O.NEW.KSHV.TO.W.0076.110526T0245Z-110526T0315Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL NATCHITOCHES PARISH IN NORTHWEST LOUISIANA...
  THIS INCLUDES THE CITY OF NATCHITOCHES...
  NORTH CENTRAL SABINE PARISH IN NORTHWEST LOUISIANA...

* UNTIL 1015 PM CDT

* AT 944 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 16 MILES WEST OF
  NATCHITOCHES...MOVING EAST AT 35 MPH.

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

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 3173 9348 3184 9347 3185 9344 3190 9344
      3191 9335 3189 9334 3189 9327 3191 9326
      3192 9295 3178 9296 3176 9297 3171 9298
      3170 9296 3161 9296
TIME...MOT...LOC 0245Z 279DEG 30KT 3178 9337

$$

09

1 follow-up statement

500 
WWUS54 KSHV 260305
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1005 PM CDT WED MAY 25 2011

LAC069-085-260315-
/O.CON.KSHV.TO.W.0076.000000T0000Z-110526T0315Z/
SABINE LA-NATCHITOCHES LA-
1005 PM CDT WED MAY 25 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1015 PM CDT FOR
NATCHITOCHES AND SABINE PARISHES...

AT 1000 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR HAGEWOOD...OR 7 MILES WEST OF NATCHITOCHES...MOVING EAST
AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CAMPTI...GRAND ECORE...NATCHEZ...CLEAR LAKE...CLARENCE AND BERMUDA

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 3173 9348 3184 9347 3185 9344 3190 9344
      3191 9335 3189 9334 3189 9327 3191 9326
      3192 9295 3178 9296 3176 9297 3171 9298
      3170 9296 3161 9296
TIME...MOT...LOC 0305Z 279DEG 30KT 3173 9316

$$

09

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, 8:31 PM CDT	Tornado Warning	SHV	Ouachita, Union	30 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, 9:57 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.