Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 249, NWS Shreveport, LA

May 2, 2008Panola County, Texas; Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 2, 2008, 12:40 PM CDT for Panola County, Texas; Caddo Parish, De Soto Parish, Louisiana. It was in force for 23 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: May 2, 2008, 12:40 PM CDT (17:40 UTC)
Expired: May 2, 2008, 1:03 PM CDT
In force: 23 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Caddo Parish, LA, De Soto Parish, LA, Panola County, TX

The radar

The Shreveport radar (KSHV), 24 km from the middle of the area, began a volume at 17:42 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.

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 2, 8:49 AM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.7 hours before the alert went out and 32 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: 2045 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 641 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 329 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 7.1

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 May 2, 11:45 AM CDT, 55 minutes earlier.

Area forecast discussion, May 2, 11:45 AM CDT, 55 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1145 AM CDT FRI MAY 2 2008

.DISCUSSION...
WILL UPDATE ZONES SHORTLY FOR THIS AFTERNOON. FRONT HAS PROGRESSED
TO A HOPE ARKANSAS TO JACKSONVILLE TEXAS LINE AT THIS TIME. WILL
ELIMINATE TORNADO WATCH FOR ALL COUNTIES BEHIND THE SURFACE FRONT.
TEMPS WILL HAVE TO BE ADJUSTED SOME...BUT SKIES CLEARING RAPIDLY
BEHIND FRONT WILL OFFSET COOL AIR ADVECTION TO SOME EXTENT.
PRESSURE GRADIENT IS SLACKING OFF...SO DO NOT THINK LAKE WIND
ADVSY WILL BE NEEDED PAST NOON. POPS RAISED SLIGHTLY SOME AREAS
AHEAD OF LINE.

&&

AVIATION...
MIX OF VFR/MVFR CIGS WITH A TOR WATCH OVER I-20 AND
NORTH.  ALSO...A LINE OF SHWR/TSTMS DRAPED FROM KDEQ TO NEAR
KTYR...WITH OTHER LIGHT SHWRS/ISOL TSTM NEAR KELD DIMINISHING.
MODELS ARE AGGRESSIVELY PROGRESSING A FRONT TOWARD THE AREA THIS
MORNING...AND WITH DECENT MOISTURE...AND INSTABILITY TEMPO WILL
LIKELY KEEP TSRA IN 18Z TAFS. MODELS STALL THE FRONT ONCE IT MOVES
INTO THE CWA...LEAVING THE POTENTIAL FOR TSRA THROUGH THE END OF
THE 12Z TAF PERIOD. TSRA WILL REMAIN THE MAIN THREAT FOR AVIATION
INTEREST TODAY...BUT MVFR TO VFR FLIGHT CONDITIONS WILL BE COMMON
WITH GUSTY SOUTHERLY WINDS FOR MOST WITH SOME MODERATE WEST WINDS
OVER THE WESTERN SECTIONS. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  79  59  76  53 /  80  60  10   0
MLU  81  63  76  54 /  80  80  20   0
DEQ  76  50  71  43 /  10  10  10   0
TXK  77  55  69  49 /  20  20  10   0
ELD  78  57  73  49 /  80  60  10   0
TYR  78  56  73  52 /  10  10  10   0
GGG  78  57  74  52 /  40  30  10   0
LFK  84  64  80  56 /  60  70  20   0

&&

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

14/24

Hazardous weather outlook, May 2, 6:25 AM CDT, 6 hours 15 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
625 AM CDT FRI MAY 2 2008

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-021700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-
UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
625 AM CDT FRI MAY 2 2008

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

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK FOR SEVERE THUNDERSTORMS THIS AFTERNOON
AND EVENING. A COLD FRONT WILL PUSH THROUGH THE FOUR STATE AREA
BEGINNING IN SOUTHEAST OK THIS MORNING AND ADVANCING THROUGH
CENTRAL LA BY LATE THIS EVENING. STRONG THUNDERSTORMS WILL BE
POSSIBLE AHEAD OF THE FRONT...TO THE NORTH OF INTERSTATE 20 EASTWARD OF
LONGVIEW TEXAS...WITH THE GREATEST THREAT OF SEVERE WEATHER
LOCATED ACROSS SOUTHERN ARKANSAS AND NORTH CENTRAL LOUISIANA THIS
EVENING. THE MAIN THREATS FOR TODAY WILL BE LARGE HAIL AND
DAMAGING WINDS...ALTHOUGH LOCALLY HEAVY RAIN AND ISOLATED
TORNADOES ARE ALSO POSSIBLE. THUNDERSTORM ACTIVITY WILL CONTINUE
THROUGH THE EARLY MORNING HOURS OF SATURDAY ACROSS CENTRAL
LOUISIANA BEFORE EXITING THE REGION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER...HAM RADIO OPERATOR...AND EMERGENCY MANAGEMENT
PERSONNEL ACTIVATION MAY BE NEEDED TODAY...MAINLY FOR
LOCATIONS NORTH OF INTERSTATE 20 EASTWARD OF LONGVIEW TEXAS.

18

In the hours before

Special weather statement, May 2, 8:32 AM CDT, 4 hours 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
832 AM CDT FRI MAY 2 2008

TXZ109>111-124-125-136-137-150-021430-
CAMP-GREGG-MORRIS-RUSK-SMITH-TITUS-UPSHUR-WOOD-
832 AM CDT FRI MAY 2 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SPECIAL
WEATHER STATEMENT EFFECTIVE UNTIL 930 AM CDT FOR THE FOLLOWING
COUNTIES
IN NORTHEAST TEXAS
     TITUS...MORRIS...CAMP...WOOD...UPSHUR...SMITH...GREGG AND RUSK

INCLUDING THE FOLLOWING LOCATIONS
     BIG SANDY...CLARKSVILLE CITY...EAST MOUNTAIN...GILMER...
     GLADEWATER...GOLDEN...HAINESVILLE...HAWKINS...HOARD...KILGORE...
     LIBERTY CITY...LINDALE...MINEOLA...QUITMAN...ROSEWOOD...TYLER...
     WEST MOUNTAIN AND WHITE OAK

AT 829 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 6 MILES NORTHEAST OF VAN...OR 8 MILES SOUTHWEST
OF MINEOLA...MOVING EAST AT 38 MPH.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3235 9480 3226 9548 3235 9546 3249 9561
      3269 9562 3272 9565 3275 9565 3306 9477
TIME...MOT...LOC 1332Z 267DEG 33KT 3260 9556

14

Special weather statement, May 2, 11:03 AM CDT, 1 hour 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1103 AM CDT FRI MAY 2 2008

TXZ138-150-151-021630-
HARRISON-PANOLA-RUSK-
1103 AM CDT FRI MAY 2 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SPECIAL
WEATHER STATEMENT EFFECTIVE UNTIL 1130 AM CDT FOR THE FOLLOWING
COUNTIES
IN NORTHEAST TEXAS
     HARRISON...RUSK AND PANOLA

INCLUDING THE FOLLOWING LOCATIONS
     BECKVILLE...HENDERSON...JOINERVILLE...NEW LONDON AND TATUM

AT 1103 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A SEVERE THUNDERSTORM LIKELY PRODUCING LARGE HAIL AND DAMAGING WIND
GUSTS TO NEAR 70 MPH JUST NORTH OF HENDERSON TEXAS. THIS STORM HAS
EXHIBITED STRONG ROTATION ALOFT IN THE STORM. IF THIS ROTATION BEGINS
TO LOWER WITH THE DOWNDRAFT...A TORNADO WARNING WILL BE NEEDED FOR
THIS THUNDERSTORM.

LAT...LON 3226 9494 3238 9467 3237 9459 3239 9458
      3240 9460 3248 9440 3227 9430 3210 9486
TIME...MOT...LOC 1603Z 247DEG 36KT 3222 9480

13

Local storm report, May 2, 12:00 PM CDT, 40 minutes before

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Local storm report, May 2, 12:01 PM CDT, 39 minutes before

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Local storm report, May 2, 12:22 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1222 PM CDT FRI MAY 02 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1204 PM     TORNADO          BECKVILLE               32.24N 94.46W
05/02/2008                   PANOLA             TX   LAW ENFORCEMENT

            PANOLA COUNTY SHERIFF REPORTS TORNADO ON THE GROUND ON FM
            124 NEAR BECKVILLE

&&

04

Local storm report, May 2, 12:36 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1236 PM CDT FRI MAY 02 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1121 AM     TORNADO          1 NE HENDERSON          32.17N 94.79W
05/02/2008                   RUSK               TX   EMERGENCY MNGR

            TREES AND POWER LINES DOWNED FROM PATH NE OF HENDERSON.
            ONE BARN AND TWO OUTHOUSES DESTROYED. ONE HOME DAMAGED.

&&

04

The office that day

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

Issued	Product	Office	Counties	Lasted
May 2, 4:49 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	8 hr
May 2, 8:32 AM CDT	Special Weather Statement	SHV	Camp, Gregg, Smith, Upshur, Wood	58 min
May 2, 9:12 AM CDT	Tornado Warning	SHV	Smith, Upshur, Wood	33 min
May 2, 9:43 AM CDT	Tornado Warning	SHV	Gregg, Rusk, Smith, Upshur, Wood	33 min
May 2, 9:47 AM CDT	Severe Thunderstorm Warning	SHV	Bowie	43 min
May 2, 10:08 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk, Upshur	37 min
May 2, 10:19 AM CDT	Tornado Warning	SHV	Bowie	41 min
May 2, 10:40 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Rusk, Smith	35 min
May 2, 11:03 AM CDT	Special Weather Statement	SHV	Rusk	27 min
May 2, 11:13 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola, Rusk	47 min
May 2, 11:21 AM CDT	Tornado Warning	SHV	Panola, Rusk	39 min
May 2, 11:54 AM CDT	Tornado Warning	SHV	Panola	51 min
May 2, 12:58 PM CDT	Special Weather Statement	SHV	Panola	32 min
May 2, 2:46 PM CDT	Severe Thunderstorm Warning	SHV	Shelby	44 min
May 2, 3:01 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	27 min
May 2, 4:30 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	30 min
May 2, 4:57 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Webster	33 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2008 Severe Thunderstorm Warnings in Texas, 2008 Every severe thunderstorm warning in 2008

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; radar from the NEXRAD Level II archive.