Alert archive / Louisiana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 251, NWS Shreveport, LA

June 21, 2011Grant Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jun 21, 2011, 6:54 AM CDT for Grant Parish, Winn Parish, Louisiana. It was in force for 59 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: Jun 21, 2011, 6:54 AM CDT (11:54 UTC)
Expired: Jun 21, 2011, 7:53 AM CDT
In force: 59 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Grant Parish, LA, Winn Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jun 21, 6:58 AM CDT	TSTM WND DMG	2 E Verda, LA	A TREE WAS DOWNED ACROSS HIGHWAY 471 EAST OF THE VERDA COMMUNITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 4 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 11.9 hours before the alert went out and 145 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: 730 J/kg
Mixed-layer CIN: -76 J/kg
Mixed-layer LCL: 2502 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

342 
WUUS54 KSHV 211154
SVRSHV
LAC043-127-211300-
/O.NEW.KSHV.SV.W.0251.110621T1154Z-110621T1300Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
654 AM CDT TUE JUN 21 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  SOUTHEASTERN WINN PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 800 AM CDT

* AT 654 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 7 MILES
  NORTHWEST OF COLFAX...OR NEAR ALOHA...AND MOVING NORTHEAST AT 
  45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LAKE
  IATT...DRY PRONG...WILLIANA...GEORGETOWN...ROCHELLE AND JOYCE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY! LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 3183 9234 3179 9237 3177 9235 3170 9237
      3170 9236 3162 9238 3146 9269 3147 9271
      3152 9272 3159 9279 3162 9287 3202 9255
      3193 9231
TIME...MOT...LOC 1154Z 215DEG 37KT 3162 9276

$$

15

2 follow-up statements

441 
WWUS54 KSHV 211228
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
728 AM CDT TUE JUN 21 2011

LAC043-211237-
/O.CAN.KSHV.SV.W.0251.000000T0000Z-110621T1300Z/
GRANT LA-
728 AM CDT TUE JUN 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR GRANT PARISH IS CANCELLED...

THE SEVERE THUNDERSTORM HAS MOVED NORTHEAST OUT OF WESTERN AND 
NORTHERN GRANT PARISH. 

LAT...LON 3202 9255 3193 9231 3183 9234 3180 9237
      3180 9251 3181 9257 3186 9268
TIME...MOT...LOC 1227Z 219DEG 42KT 3192 9249

$$

LAC127-211300-
/O.CON.KSHV.SV.W.0251.000000T0000Z-110621T1300Z/
WINN LA-
728 AM CDT TUE JUN 21 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 AM CDT
FOR WINN PARISH...

AT 728 AM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A SEVERE THUNDERSTORM CAPABLE OF
PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED
NEAR COLGRADE...OR 7 MILES EAST OF WINNFIELD...MOVING NORTHEAST AT 
45 MPH.

THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED PARISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...AND DEADLY CLOUD TO GROUND 
LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY 
INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

&&

LAT...LON 3202 9255 3193 9231 3183 9234 3180 9237
      3180 9251 3181 9257 3186 9268
TIME...MOT...LOC 1227Z 219DEG 42KT 3192 9249

$$

15

991 
WWUS54 KSHV 211253
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
753 AM CDT TUE JUN 21 2011

LAC127-211302-
/O.CAN.KSHV.SV.W.0251.000000T0000Z-110621T1300Z/
WINN LA-
753 AM CDT TUE JUN 21 2011

...THE SEVERE THUNDERSTORM WARNING FOR WINN PARISH IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE EARLIER SEVERE THUNDERSTORM 
WARNING HAS WEAKENED AND WAS NO LONGER SEVERE. THUS...THE SEVERE 
THUNDERSTORM WARNING HAS BEEN CANCELLED. 

LAT...LON 3202 9255 3193 9231 3183 9234 3180 9237
      3180 9251 3181 9257 3186 9268
TIME...MOT...LOC 1252Z 219DEG 42KT 3215 9227

$$

15

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 21, 4:44 AM CDT, 2 hours 10 minutes earlier.

Area forecast discussion, Jun 21, 4:44 AM CDT, 2 hours 10 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
444 AM CDT TUE JUN 21 2011

.DISCUSSION...
MCS OVER N TX CONTINUES TO MAKE GOOD PROGRESS E THIS MORNING...ALTHOUGH
IT HAS SHOWN SIGNS OF DECAYING IN THE LAST FEW MINUTES AS IT BEGINS TO
OUTRUN THE BEST LOW LEVEL CONVERGENCE ALONG THE DRY LINE/COLD FRONT
INTERSECTION...EXTENDING FROM NE OK /JUST E OF TUL/...INTO SCNTRL OK
TO NEAR MWL AND S OF ABI. BOUNDARIES FROM THIS MCS WILL LIKELY SERVE
AS FOCUS FOR ADDITIONAL CONVECTION THIS MORNING ACROSS NE TX/SE OK/SW
AR...AS THE INITIAL SHORTWAVE AHEAD OF THE LONGWAVE TROUGH OVER THE
CNTRL/SRN PLAINS EJECTS NE ALONG AND N OF THE I-30 CORRIDOR THIS
MORNING. ALSO SEEING SCT SHRA DEVELOPING ALONG A SW TO NE ORIENTED
925-850MB THETA-E AXIS OVER E TX/NW LA/SW AR...WITH LARGE SCALE
FORCING INCREASING LATER THIS MORNING/EARLY AFTERNOON WITH THE
APPROACH OF THE INITIAL SHORTWAVE TROUGH. TEMPS TODAY WILL BE
DEPENDENT ON HOW LONG THIS CONVECTION PERSISTS...BUT AS MUCH OF THE
AREA HAS YET TO FALL BELOW 80 DEGREES AS OF 09Z...PREFER TO ADD SOME
CUSHION WITH TEMPS AS CONVECTION MAY DIMINISH DURING THE AFTERNOON
FROM THE W WITH THE TROUGH PASSAGE. CAN/T RULE OUT AN ISOLATED SVR
THREAT TODAY IN POCKETS OF INSTABILITY THAT DEVELOPS...BUT BRIEF HEAVY
RAINFALL AND LOCALLY GUSTY WINDS WILL BE THE PRIMARY THREATS FROM THE
STRONGER STORMS.

THE CONVECTION SHOULD BE WINDING DOWN BY EARLY EVENING...ALTHOUGH WILL
HAVE TO LOOK UPSTREAM THIS EVENING NEAR THE NEARLY STATIONARY COOL
FRONT...AS LOW LEVEL CONVERGENCE ALONG THIS BNDRY WILL INCREASE BY
EARLY EVENING ALONG A 30KT SWRLY LLJ...AS THE NEXT SHORTWAVE ROUNDS
THE PLAINS TROUGH. THE NAM GENERATES MODERATE TO STRONG INSTABILITY
THIS AFTERNOON ALONG AND AHEAD OF THE FRONT OVER NW AR/SE OK/N TX /ON
THE ORDER OF 2000-3000 J/KG/...AS VERY STEEP MID LEVEL LAPSE RATES
ROUND THE TROUGH. THUS...SCT SVR CONVECTION WILL LIKELY DEVELOP EARLY
THIS EVENING OVER THESE AREAS...WHICH SHOULD BEGIN TO PROPAGATE ESE AS
ANOTHER POTENTIAL MCS INTO SE OK/SW AR/EXTREME NE TX. INSTABILITY
DOWNSTREAM NW OF THE I-30 CORRIDOR IS PROGGED TO BE A BIT LOWER GIVEN
THE PERSISTENT CLOUD COVER/SLIGHTLY COOLER TEMPS...ALTHOUGH CAN/T RULE
OUT A SVR THREAT AS WELL SHOULD CONVECTION BECOME ORGANIZED ENOUGH TO
PRODUCE COLD POOLING WHICH WOULD SIGNIFY AN ENHANCED DAMAGING WIND
THREAT. WILL KEEP HIGH CHANCE POPS AREAWIDE TONIGHT...ALTHOUGH ANY
POTENTIAL MCS THAT DEVELOPS SHOULD WEAKEN OVERNIGHT AS LOW LEVEL
CONVERGENCE WEAKENS IN RESPONSE TO THE LOW LEVEL FLOW VEERING MORE
WSW OVER THE REGION.

CONVECTION SHOULD BEGIN TO WIND DOWN WEDNESDAY FROM NW TO SE...WITH
THE PRIMARY UPPER TROUGH PASSAGE. SHORT TERM PROGS INDICATE THAT THE
COLD FRONT MAY BE REINFORCED SWD BY THE MORNING CONVECTION INTO
EXTREME NE TX/SW AR WEDNESDAY MORNING...BUT SHOULD WASH OUT DURING THE
DAY. BRIEF HEAVY RAINFALL WILL BE THE PRIMARY THREAT FROM THE STORMS
WEDNESDAY...AS LOW LEVEL SHEAR WILL REMAIN QUITE WEAK ATOP A VERY
MOIST PW ENVIRONMENT /AOA 2 INCHES/. WILL MAINTAIN HIGH CHANCE POPS
FOR THE SRN HALF OF THE REGION WEDNESDAY...TAPERING POPS GRADUALLY
FROM THE NW DURING THE AFTERNOON.

UPPER RIDGING OVER NRN MX WILL BEGIN TO BUILD E ACROSS WCNTRL TX
FRIDAY...BEFORE EXPANDING E OVER OUR REGION DURING THE WEEKEND. THE
GFS DOES WANT TO GENERATE A POTENTIAL MCS IN THE NW FLOW ROUNDING THE
RIDGE EARLY FRIDAY MORNING ACROSS SE OK/SW AR. THE ECMWF IS MUCH
DRIER...MAINTAINING A STRONGER RIDGE FARTHER E THAN THE GFS. WILL SIDE
THIS PORTION OF THE FORECAST WITH THE GFS...UPPING POPS TO CHANCE
OVER ALL BUT THE WSW PORTIONS OF E TX. THIS MAY BE OUR LAST BOUT WITH
RAIN FOR SOME TIME AS THE RIDGE EXPANDS E AND AMPLIFIES...WITH TRIPLE
DIGIT HEAT NOT OUT OF THE REALM OF POSSIBILITY BY LATE IN THE
WEEKEND/EARLY NEXT WEEK...ESPECIALLY OVER E TX. HAVE TRENDED TEMPS
ABOVE MOS FOR THE LATTER EXTENDED...ALTHOUGH THE EXTENDED TEMPS WILL
BE GOVERNED TO SOME EXTENT AS TO HOW MUCH RAIN WE CAN RECEIVE DURING
THE NEXT FEW DAYS. MLU AND LFK ARE ALREADY SITTING AT 30 STRAIGHT DAYS
WITHOUT RECEIVING /MEASUREABLE/ RAINFALL.

PRELIMS TO FOLLOW BELOW...

15

&&

.AVIATION...
CONCERNING THE ARKLATEX...SHRA WILL CONTINUE E OF KLFK...TO KELD.
MEANWHILE...A LINE OF TSTMS APPROACHES FROM THE WEST. MVFR/VFR CIGS
ATTM...BUT WILL GO SOUTH FAST IN AND NEAR HEAVY DOWNPOURS. COULD BE
SOME DAMAGING WINDS IN BOWS OR HAIL IN TALL STORMS. MAY ONLY SEE
ANOTHER 6 HRS OUT OF THESE...BUT MORE EXPECTED LATER TODAY AND
TONIGHT AS THE UPPER STORM SWINGS IN OVER THE REGION. PREVAILING
WINDS WILL BE S AT 8-14 KTS WITH HIGHER GUSTS TO 20 OR 25 MPH.
GRADIENT WILL RELAX BY 00Z WED...ALLOWING FOR LIGHT SLY WINDS TUE
NIGHT. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  92  75  93  74  95 /  60  50  50  20  20
MLU  90  73  92  73  94 /  60  50  50  20  20
DEQ  90  71  92  70  93 /  60  50  20  10  20
TXK  91  73  92  72  94 /  60  50  30  10  20
ELD  90  73  92  72  94 /  60  50  50  10  20
TYR  93  74  93  74  95 /  50  50  40  20  20
GGG  93  75  93  74  95 /  50  50  40  20  20
LFK  93  75  93  75  95 /  60  50  50  30  20

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

15/24

Hazardous weather outlook, Jun 21, 5:32 AM CDT, 1 hour 22 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
532 AM CDT TUE JUN 21 2011

ARZ050-051-059>061-070>073-LAZ001>004-OKZ077-TXZ096-097-108>112-
124>126-136>138-149>151-211700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-MCCURTAIN-
RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-
MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-
532 AM CDT TUE JUN 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS...SOUTHWEST ARKANSAS...NORTHWEST LOUISIANA...SOUTHEAST
OKLAHOMA AND NORTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT...

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL DEVELOP TODAY AND
SPREAD EAST NORTHEAST ACROSS NORTHEAST TEXAS...SOUTHEAST
OKLAHOMA...AND SOUTHWEST ARKANSAS...AHEAD OF AN UPPER LEVEL
DISTURBANCE THAT WILL EJECT ACROSS THE REGION. ISOLATED SEVERE
THUNDERSTORMS WILL BE POSSIBLE...MAINLY THIS MORNING...WITH
LOCALIZED AREAS OF DAMAGING WINDS POSSIBLE. HOWEVER...LOCALLY
HEAVY RAINFALL WILL BE POSSIBLE FROM THE STRONGER STORMS AS WELL.
THESE SHOULD DIMINISH THIS AFTERNOON WITH THE PASSAGE OF THE UPPER
LEVEL DISTURBANCE.

SCATTERED SHOWERS AND THUNDERSTORMS MAY REDEVELOP THIS EVENING
OVER EASTERN OKLAHOMA AND NORTH TEXAS...ALONG AND AHEAD OF A WEAK
COLD FRONT. GIVEN THE MUCH STRONGER INSTABILITY EXPECTED THIS
AFTERNOON OVER THESE AREAS...AND ALSO THE APPROACH OF ANOTHER
UPPER LEVEL DISTURBANCE...SCATTERED SEVERE THUNDERSTORMS WILL BE
POSSIBLE...WHICH MAY SPREAD EAST SOUTHEAST INTO NORTHEAST
TEXAS...SOUTHEAST OKLAHOMA...AND SOUTHWEST ARKANSAS LATER TONIGHT.
SHOULD THESE STORMS HOLD TOGETHER OVERNIGHT...AN ISOLATED SEVERE
WEATHER THREAT WILL EXIST...WITH DAMAGING WINDS...LARGE HAIL...AND
LOCALLY HEAVY RAINFALL POSSIBLE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

SCATTERED SHOWERS AND THUNDERSTORMS WILL DIMINISH FROM NORTHWEST
TO SOUTHEAST WEDNESDAY MORNING. ALTHOUGH ISOLATED THUNDERSTORMS
MAY REDEVELOP WEDNESDAY AFTERNOON OVER THE REGION DURING PEAK
HEATING...THE THREAT FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND HAM
RADIO OPERATORS...MAY BE NEEDED TODAY AND TONIGHT.

LAZ005-006-010>014-017>022-TXZ152-153-165>167-211700-
LINCOLN-UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-
SABINE LA-NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-NACOGDOCHES-
SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX-
532 AM CDT TUE JUN 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
LOUISIANA...NORTHWEST LOUISIANA AND EAST TEXAS.

.DAY ONE...TODAY AND TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP TODAY ACROSS DEEP
EAST TEXAS AND NORTHCENTRAL LOUISIANA...AHEAD OF AN UPPER LEVEL
DISTURBANCE THAT WILL SHIFT EAST ACROSS THE REGION. AN ISOLATED
SEVERE THUNDERSTORM THREAT WILL EXIST TODAY...WITH SOME OF THE
STRONGER STORMS PRODUCING LOCALLY GUSTY WINDS AND HEAVY RAINFALL.
A POTENTIAL BRIEF LULL WILL BE POSSIBLE AS THESE SHOWERS AND
THUNDERSTORMS WILL DIMINISH FROM WEST TO EAST LATE THIS AFTERNOON
AND EARLY EVENING. HOWEVER...ADDITIONAL SCATTERED SHOWER AND
THUNDERSTORM REDEVELOPMENT IS EXPECTED LATE TONIGHT WITH THE
APPROACH OF ANOTHER UPPER LEVEL DISTURBANCE. BRIEF HEAVY RAINFALL
WILL BE POSSIBLE WITH SOME OF THE STRONGER STORMS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

SCATTERED SHOWERS AND THUNDERSTORMS WILL REMAIN POSSIBLE WEDNESDAY
ACROSS DEEP EAST TEXAS AND NORTHCENTRAL LOUISIANA...AS ANOTHER
UPPER LEVEL DISTURBANCE PROGRESSES SOUTHEAST ACROSS THE REGION.
BRIEF HEAVY RAINFALL WILL BE POSSIBLE FROM THE STRONGER STORMS.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND HAM
RADIO OPERATORS...SHOULD NOT BE NEEDED TODAY AND TONIGHT.

15

In the hours before

Special weather statement, Jun 21, 5:20 AM CDT, 1 hour 34 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
520 AM CDT TUE JUN 21 2011

LAZ018>020-211045-
GRANT-NATCHITOCHES-WINN-
520 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 545 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     NATCHITOCHES...
IN NORTH CENTRAL LOUISIANA...
     GRANT AND WINN...

INCLUDING THE FOLLOWING LOCATIONS...
     MONTGOMERY AND WINNFIELD...

AT 517 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR MONTGOMERY...OR 16 MILES
SOUTHEAST OF NATCHITOCHES...MOVING NORTHEAST AT 30 MPH.

WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

24

Special weather statement, Jun 21, 5:31 AM CDT, 1 hour 23 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
531 AM CDT TUE JUN 21 2011

TXZ096-097-108>112-124>126-211130-
BOWIE-CAMP-CASS-FRANKLIN-MARION-MORRIS-RED RIVER-TITUS-UPSHUR-WOOD-
531 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 630 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     FRANKLIN...MARION...MORRIS...RED RIVER...TITUS...UPSHUR...
     WOOD...CASS...CAMP AND BOWIE...

INCLUDING THE FOLLOWING LOCATIONS...
     CASON...CEDAR SPRINGS...COOKVILLE...DAINGERFIELD...DALBY
     SPRINGS...DE KALB...GILMER...GOLDEN...HAINESVILLE...HOOKS...
     HUGHES SPRINGS...JENKINS...LEESBURG...LINDEN...LONE STAR...
     MAUD...MOUNT PLEASANT...NAPLES...NASH...NEW BOSTON...NEWSOME...
     OMAHA...ORE CITY...PITTSBURG...PLEASANT GROVE...QUITMAN...
     REDWATER...ROCKY BRANCH...ROSEWOOD...SCROGGINS...SIMMS...
     TEXARKANA...US 259 AND I 30 INTERSECTION...WAKE VILLAGE AND
     WINNSBORO...

AT 527 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM DE KALB TO
GOLDEN...OR ALONG A LINE EXTENDING FROM 11 MILES WEST OF NEW BOSTON
TO 8 MILES NORTHWEST OF MINEOLA...MOVING EAST AT 30 MPH.

WINDS 30 TO 40 MPH ARE EXPECTED WITH THESE STORMS.

24

Special weather statement, Jun 21, 5:45 AM CDT, 1 hour 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
545 AM CDT TUE JUN 21 2011

LAZ013-014-019-021-211145-
CALDWELL-JACKSON-OUACHITA-WINN-
545 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 645 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTH CENTRAL LOUISIANA...
     OUACHITA...JACKSON...CALDWELL AND WINN...

INCLUDING THE FOLLOWING LOCATIONS...
     WINNFIELD...

AT 541 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES
SOUTH OF JONESBORO TO 9 MILES SOUTHWEST OF WINNFIELD...MOVING
NORTHEAST AT 40 MPH.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THESE STORMS.

24

Special weather statement, Jun 21, 6:02 AM CDT, 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
602 AM CDT TUE JUN 21 2011

LAZ010-011-017-018-211200-
DE SOTO-NATCHITOCHES-RED RIVER-SABINE-
602 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 700 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     SABINE...RED RIVER...NATCHITOCHES AND DE SOTO...

INCLUDING THE FOLLOWING LOCATIONS...
     MANY AND ZWOLLE...

AT 602 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM JUST EAST OF ZWOLLE...OR 28 MILES
NORTHWEST OF ANACOCO...MOVING NORTHEAST AT 25 MPH.

WINDS 40 TO 45 MPH ARE EXPECTED WITH THIS STORM.

15

Special weather statement, Jun 21, 6:46 AM CDT, 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
646 AM CDT TUE JUN 21 2011

LAZ018>020-211245-
GRANT-NATCHITOCHES-WINN-
646 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 745 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     NATCHITOCHES...
IN NORTH CENTRAL LOUISIANA...
     GRANT AND WINN...

INCLUDING THE FOLLOWING LOCATIONS...
     COLFAX...MONTGOMERY AND WINNFIELD...

AT 646 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM 9 MILES WEST OF COLFAX...OR NEAR THE
CHOPIN COMMUNITY IN SOUTHERN NATCHITOCHES PARISH...MOVING NORTHEAST
AT 40 MPH.

PEA SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.
SHOULD THIS STORM INTENSIFY...A SEVERE THUNDERSTORM WARNING WILL BE
NEEDED.

15

Special weather statement, Jun 21, 6:48 AM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
648 AM CDT TUE JUN 21 2011

LAZ005-006-013-014-211230-
JACKSON-LINCOLN-OUACHITA-UNION-
648 AM CDT TUE JUN 21 2011

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 730 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTH CENTRAL LOUISIANA...
     UNION...OUACHITA...LINCOLN AND JACKSON...

INCLUDING THE FOLLOWING LOCATIONS...
     BROWNSVILLE-BAWCOMVILLE...CLAIBORNE...STERLINGTON AND WEST
     MONROE...

AT 648 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM 11 MILES WEST OF CLAIBORNE...MOVING
NORTHEAST AT 50 MPH.

WINDS OF 40 TO 45 MPH ARE EXPECTED WITH THIS STORM AS IT AFFECTS
NORTHERN AND WESTERN OUACHITA PARISH...AND EASTERN UNION PARISH.

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 21, 9:21 AM CDT	Areal Flood Advisory	SHV	Bossier, Caddo, De Soto	54 min
Jun 21, 10:46 AM CDT	Flash Flood Warning	SHV	Bienville, Jackson, Lincoln, Ouachita, Union	3 hr
Jun 21, 5:16 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	44 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2011 Every severe thunderstorm warning 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.