Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 61, NWS Shreveport, LA

March 31, 2009Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 31, 2009, 9:22 AM CDT for Grant Parish, LaSalle Parish, Louisiana. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Mar 31, 2009, 9:22 AM CDT (14:22 UTC)
Expired: Mar 31, 2009, 10:00 AM CDT
In force: 38 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Grant Parish, LA, LaSalle Parish, LA

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 2.4 hours before the alert went out and 161 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: 716 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 175 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 1.2

Open this sounding in Storm Lab

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 Mar 31, 5:39 AM CDT, 3 hours 43 minutes earlier.

Area forecast discussion, Mar 31, 5:39 AM CDT, 3 hours 43 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
539 AM CDT TUE MAR 31 2009

.DISCUSSION...

EARLY THIS MORNING A COLD FRONT TRAILED FROM SURFACE LOW PRESSURE
OVER THE CENTRAL SECTIONS OF THE COUNTRY...SOUTHWEST NEAR A TEXARKANA
ARKANSAS...AND TYLER AND JACKSONVILLE TEXAS LINE. SHOWERS AND
THUNDERSTORMS WERE OCCURRING ALONG THE BOUNDARY WITH SOME OF THE
STORMS STRONG TO ISOLATED SEVERE. THIS BOUNDARY WILL CONTINUE
MOVING OFF TO THE EAST ACROSS THE AREA DURING THE DAY AND OFF
AWAY BY TONIGHT. SURFACE HIGH PRESSURE WILL BUILD IN WAKE OF THE
FRONT PROVIDING DRY WEATHER BUT ANOTHER SURFACE LOW AND COLD FRONT
WILL BE MOVING ACROSS THE FOUR STATE REGION WEDNESDAY NIGHT AND THURSDAY.
SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THIS SYSTEM AS WELL.
SINCE THIS NEXT LOW WILL BE MOVING ALONG THE RED RIVER AND THEN
ACROSS SOUTHERN ARKANSAS AND NORTH LOUISIANA...EXPECTING SOME WRAP
AROUND PRECIPITATION IN ITS WAKE WITH RAIN ENDING THURSDAY NIGHT.
HIGH PRESSURE ON THE SURFACE WILL FOLLOW...WITH ANOTHER SURFACE
LOW MOVING ACROSS THE PLAINS WITH TRAILING COLD FRONT MOVING INTO
THE FORECAST AREA SATURDAY NIGHT AND SUNDAY. AS USUAL EXPECT
ANOTHER ROUND OF SHOWERS AND THUNDERSTORMS. RAIN WILL END LATE SUNDAY
AFTERNOON AND EVENING. THE NEXT RAIN RETURNS NEAR MID WEEK WITH ANOTHER
IN A SERIES OF SURFACE LOWS AND ASSOCIATED COLD FRONT../06/

&&

.AVIATION...

MVFR/IFR CONDITIONS...DUE TO SHOWERS AND THUNDERSTORMS...CAN BE
EXPECTED THIS MORNING ACROSS ALL TERMINALS AS A FRONT PROGRESSES
THROUGH THE FOUR STATE REGION. AFTER FRONTAL PASSAGE...WINDS WILL
SHIFT TO THE NW WITH SKY CONDITIONS IMPROVING FROM WEST TO EAST.
EXPECTING VFR CONDITIONS IN TYR BY 15Z...SHV BY 18Z...AND MLU BY 22Z.
/05/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  66  44  74  56  69 /  70   0   0  30  40
MLU  68  43  73  54  74 /  70  10   0  20  60
DEQ  64  34  72  50  59 /  50   0   0  40  60
TXK  64  42  73  52  62 /  50   0   0  40  50
ELD  64  38  73  53  68 /  70  10   0  20  60
TYR  64  46  74  57  65 /  50   0   0  30  30
GGG  64  44  74  56  67 /  50   0   0  30  30
LFK  71  47  76  56  72 /  70   0   0  20  30

&&

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

06/05

Hazardous weather outlook, Mar 31, 6:03 AM CDT, 3 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
603 AM CDT TUE MAR 31 2009

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-311700-
ANGELINA-BIENVILLE-BOSSIER-BOWIE-CADDO-CALDWELL-CAMP-CASS-CHEROKEE-
CLAIBORNE-COLUMBIA-DE SOTO-FRANKLIN-GRANT-GREGG-HARRISON-HEMPSTEAD-
HOWARD-JACKSON-LA SALLE-LAFAYETTE-LINCOLN-LITTLE RIVER-MARION-
MCCURTAIN-MILLER-MORRIS-NACOGDOCHES-NATCHITOCHES-NEVADA-OUACHITA-
PANOLA-RED RIVER LA-RED RIVER TX-RUSK-SABINE LA-SABINE TX-
SAN AUGUSTINE-SEVIER-SHELBY-SMITH-TITUS-UNION AR-UNION LA-UPSHUR-
WEBSTER-WINN-WOOD-
603 AM CDT TUE MAR 31 2009

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

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

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND NEAR A
COLD FRONT MOVING ACROSS THE FOUR STATE REGION DURING THE DAY. BY
EARLY TONIGHT THE FRONT WILL HAVE MOVED EAST OF THE AREA. ISOLATED
STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE ACROSS PARTS OF THE
EAST TEXAS LAKES AREA...AND NORTHWEST AND NORTH CENTRAL
LOUISIANA. THE THREAT FOR SIGNIFICANT STORMS WILL BE OVER
BY EARLY THIS EVENING. SEVERE THUNDERSTORMS WILL BE CAPABLE OF
PRODUCING LARGE HAIL THE SIZE OF PENNIES AND NICKELS...AND POSSIBLY
ISOLATED STRONG WIND GUSTS...ALONG WITH BRIEF BUT HEAVY RAINFALL
AND DEADLY LIGHTNING.

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

A SECOND ROUND OF SHOWERS AND THUNDERSTORMS RETURN WEDNESDAY NIGHT
AND THURSDAY WITH OUR NEXT COLD FRONT...FOLLOWED BY THE THIRD ROUND
SATURDAY NIGHT AND SUNDAY. WITH TEMPERATURES ON THE COOLER
SIDE ALONG WITH LOWER DEW POINTS...SEVERE THUNDERSTORMS WILL BE
MORE ISOLATED IN NATURE.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTER GROUPS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL...WILL NOT BE NEEDED ACROSS
NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...AND SOUTHWEST ARKANSAS
TODAY OR TONIGHT...BUT MAY BE CALLED UPON THROUGH THIS AFTERNOON FOR
LOWER SECTIONS OF NORTHEAST TEXAS...AND NORTHWEST AND NORTH CENTRAL
LOUISIANA.

06

In the hours before

Special weather statement, Mar 31, 3:31 AM CDT, 5 hours 51 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
331 AM CDT TUE MAR 31 2009

TXZ125-136>138-149-150-310915-
CHEROKEE-GREGG-HARRISON-RUSK-SMITH-UPSHUR-
331 AM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 415 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN NORTHEAST TEXAS...
     UPSHUR...HARRISON...SMITH...GREGG...RUSK AND CHEROKEE...

INCLUDING THE FOLLOWING LOCATIONS...
     ARP...BULLARD...CLARKSVILLE CITY...EAST MOUNTAIN...GLADEWATER...
     HALLSVILLE...HARLETON...HENDERSON...JACKSONVILLE...
     JOINERVILLE...KILGORE...LIBERTY CITY...LONGVIEW...MINDEN...
     MIXON...MOUNT SELMAN...NEW LONDON...NEW SALEM...OVERTON...
     PINEHILL...PONTA...REESE...TATUM...TROUP...TURNERTOWN...WHITE
     OAK AND WHITEHOUSE...

AT 330 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A CLUSTER STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM LIBERTY
CITY TO 6 MILES SOUTHWEST OF REESE...OR ALONG A LINE EXTENDING FROM
6 MILES WEST OF KILGORE TO 12 MILES WEST OF JACKSONVILLE...MOVING
EAST AT 40 MPH.

PEA SIZE HAIL...AND WINDS 30 TO 40 MPH CAN BE EXPECTED WITH THESE
STORMS.

PARKER

Special weather statement, Mar 31, 5:55 AM CDT, 3 hours 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
555 AM CDT TUE MAR 31 2009

TXZ150-152-153-311145-
NACOGDOCHES-RUSK-SHELBY-
555 AM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT...

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

IN NORTHEAST TEXAS...
     RUSK...
IN EASTERN TEXAS...
     SHELBY AND NACOGDOCHES...

INCLUDING THE FOLLOWING LOCATIONS...
     CENTER...GARRISON...NEUVILLE...TENAHA...TIMPSON...AND TRAWICK.

AT 553 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR TRAWICK...OR 11 MILES NORTHWEST OF
NACOGDOCHES...MOVING EAST AT 35 MPH.

DIME SIZE HAIL...AND WINDS AROUND 50 MPH ARE EXPECTED WITH THIS
STORM.

12

Special weather statement, Mar 31, 6:13 AM CDT, 3 hours 9 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
613 AM CDT TUE MAR 31 2009

TXZ151-311200-
PANOLA-
613 AM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT...

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

IN NORTHEAST TEXAS...
     PANOLA...

INCLUDING THE FOLLOWING LOCATIONS...
     CARTHAGE AND DEBERRY...

AT 611 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 9 MILES EAST OF PINEHILL...OR 9 MILES SOUTHWEST
OF CARTHAGE...MOVING NORTHEAST AT 40 MPH.

DIME SIZE HAIL...AND WINDS 40 TO 50 MPH CAN BE EXPECTED WITH THIS
STORM.

12

Special weather statement, Mar 31, 7:52 AM CDT, 1 hour 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
752 AM CDT TUE MAR 31 2009

LAZ012-013-018-019-311345-
BIENVILLE-JACKSON-NATCHITOCHES-WINN-
752 AM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 845 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     BIENVILLE AND NATCHITOCHES...
IN NORTH CENTRAL LOUISIANA...
     JACKSON AND WINN...

INCLUDING THE FOLLOWING LOCATIONS...
     JONESBORO...

AT 751 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 14 MILES SOUTHWEST OF JONESBORO...MOVING EAST AT
30 MPH.

PEA SIZE HAIL IS EXPECTED WITH THIS STORM.

23

Special weather statement, Mar 31, 8:17 AM CDT, 1 hour 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
817 AM CDT TUE MAR 31 2009

LAZ013-311415-
JACKSON-
817 AM CDT TUE MAR 31 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 915 AM CDT...FOR THE FOLLOWING
PARISH...

IN NORTH CENTRAL LOUISIANA...
     JACKSON...

INCLUDING THE FOLLOWING LOCATIONS...
     JONESBORO...

AT 816 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR JONESBORO...MOVING EAST AT 45 MPH.

PEA SIZE HAIL IS EXPECTED WITH THIS STORM.

23

Local storm report, Mar 31, 9:05 AM CDT, 17 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 31, 3:39 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk	51 min
Mar 31, 3:57 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Harrison, Nacogdoches, Panola, Rusk, Shelby	48 min
Mar 31, 4:23 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	52 min
Mar 31, 5:06 AM CDT	Severe Thunderstorm Warning	SHV	Panola	24 min
Mar 31, 5:27 AM CDT	Severe Thunderstorm Warning	SHV	Panola	48 min
Mar 31, 6:26 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Shelby	49 min
Mar 31, 7:11 AM CDT	Severe Thunderstorm Warning	SHV	Shelby	49 min
Mar 31, 8:27 AM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Winn	48 min
Mar 31, 8:31 AM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	29 min
Mar 31, 9:45 AM CDT	Severe Thunderstorm Warning	SHV	LaSalle	30 min
Mar 31, 3:30 PM CDT	Freeze Warning	SHV	Howard, Sevier	17 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2009 Every severe thunderstorm warning in 2009

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.