Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 459, NWS Shreveport, LA

December 9, 20085 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Dec 9, 2008, 11:20 AM CST for 5 parishes in Louisiana. It was in force for 40 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: Dec 9, 2008, 11:20 AM CST (17:20 UTC)
Expired: Dec 9, 2008, 12:00 PM CST
In force: 40 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bienville Parish, LA, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 93 km from the middle of the area, began a volume at 17:24 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
Dec 9, 9:32 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.3 hours before the alert went out and 84 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: 1607 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 569 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 295 m²/s²
Significant tornado parameter: 2.5
Supercell composite: 13.2

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 Dec 9, 10:23 AM CST, 57 minutes earlier.

Area forecast discussion, Dec 9, 10:23 AM CST, 57 minutes before

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Hazardous weather outlook, Dec 9, 6:00 AM CST, 5 hours 20 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
600 AM CST TUE DEC 9 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>167-091800-
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-
600 AM CST TUE DEC 9 2008

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

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

SCATTERED TO NUMEROUS THUNDERSTORMS ARE EXPECTED TO MOVE
ACROSS THE FOUR STATE REGION TODAY AND ENDING FROM WEST TO
EAST DURING THE NIGHT. SOME OF THE THUNDERSTORMS WILL
BECOME SEVERE PRODUCING LARGE HAIL...HIGH AND POSSIBLY DAMAGING
WINDS...DEADLY LIGHTNING...AND HAVE THE POTENTIAL TO PRODUCE
ISOLATED TORNADOES. THE THUNDERSTORMS WILL ALSO CONTAIN LOCALLY
HEAVY RAINFALL WHICH WILL PRODUCE PONDING OF WATER IN STREETS...
LOW LYING...AND POOR DRAINAGE AREAS.

ALSO...A LAKE WIND ADVISORY WILL BE IN EFFECT THROUGH 4 AM
CST WEDNESDAY MORNING.

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

NO HAZARDOUS WEATHER EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT OFFICIALS WILL BE NEEDED TODAY AND TONIGHT.

In the hours before

Local storm report, Dec 9, 8:20 AM CST, 3 hours before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
820 AM CST TUE DEC 09 2008

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

0512 AM     HAIL             S SHREVEPORT            32.47N 93.80W
12/09/2008  E0.75 INCH       CADDO              LA   PUBLIC

            HAIL REPORTED AT E BERT KOUNS LOOP AND MILLICENT WAY.

&&

18

Special weather statement, Dec 9, 8:51 AM CST, 2 hours 29 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
851 AM CST TUE DEC 9 2008

TXZ138-151-091515-
HARRISON-PANOLA-
851 AM CST TUE DEC 9 2008

...SIGNIFICANT WEATHER ALERT...

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

IN NORTHEAST TEXAS...
     HARRISON AND PANOLA...

INCLUDING THE FOLLOWING LOCATIONS...
     BECKVILLE...DEBERRY...ELYSIAN FIELDS AND WASKOM...

AT 849 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR BECKVILLE...OR 11 MILES NORTHWEST OF
CARTHAGE...MOVING NORTHEAST AT 45 MPH.

HAIL SMALLER THAN THREE QUARTERS OF AN INCH...AND WINDS 40 TO 50 MPH
ARE EXPECTED WITH THIS STORM.

STAY TUNED FOR FURTHER UPDATES FROM YOUR NATIONAL WEATHER SERVICE IN
SHREVEPORT.

LAT...LON 3228 9453 3230 9453 3232 9450 3239 9448
      3239 9449 3239 9452 3240 9455 3262 9404
      3229 9404 3213 9452 3224 9456
TIME...MOT...LOC 1451Z 238DEG 40KT 3229 9444

BUTTS

Special weather statement, Dec 9, 9:18 AM CST, 2 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
918 AM CST TUE DEC 9 2008

LAZ001-002-010-TXZ126-138-151-091600-
BOSSIER-CADDO-DE SOTO-HARRISON-MARION-PANOLA-
918 AM CST TUE DEC 9 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 1000 AM CST...FOR THE FOLLOWING
PARISHES AND COUNTIES...

IN NORTHWEST LOUISIANA...
     CADDO...BOSSIER AND NORTHERN DE SOTO...
IN NORTHEAST TEXAS...
     EASTERN MARION...EASTERN HARRISON AND EASTERN PANOLA...

INCLUDING THE FOLLOWING LOCATIONS...
     BENTON...BLANCHARD...BOSSIER CITY...EASTWOOD...GREENWOOD...OIL
     CITY...PLAIN DEALING...RED CHUTE...SHREVEPORT...STONEWALL...
     DEBERRY...ELYSIAN FIELDS...KARNACK AND WASKOM...

AT 916 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES SOUTH OF
KARNACK TO ELYSIAN FIELDS TO CARTHAGE...OR ALONG A LINE EXTENDING
FROM 10 MILES EAST OF MARSHALL TO 17 MILES SOUTHEAST OF MARSHALL TO
CARTHAGE...MOVING NORTHEAST AT 40 MPH.

HAIL SMALLER THAN THREE QUARTERS OF AN INCH...AND WINDS AROUND 40
MPH ARE EXPECTED WITH THESE STORMS.

STAY TUNED FOR FURTHER UPDATES FROM YOUR NATIONAL WEATHER SERVICE IN
SHREVEPORT.

LAT...LON 3204 9440 3233 9421 3267 9431 3300 9361
      3271 9355 3224 9355 3223 9360 3217 9355
TIME...MOT...LOC 1518Z 236DEG 37KT 3259 9416 3238 9412
          3217 9426

BUTTS

Special weather statement, Dec 9, 10:27 AM CST, 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1027 AM CST TUE DEC 9 2008

LAZ001>004-010-012-091730-
BIENVILLE-BOSSIER-CADDO-CLAIBORNE-DE SOTO-WEBSTER-
1027 AM CST TUE DEC 9 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 1130 AM CST...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     EASTERN CADDO...BOSSIER...WEBSTER...CLAIBORNE...
     WESTERN BIENVILLE AND NORTHERN DE SOTO...

INCLUDING THE FOLLOWING LOCATIONS...
     BOSSIER CITY...COTTON VALLEY...EASTWOOD...GIBSLAND...HAUGHTON...
     HAYNESVILLE...HOMER...MINDEN...RED CHUTE...RINGGOLD...SAREPTA...
     SIBLEY AND STONEWALL...

AT 1024 AM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES WEST OF
SAREPTA TO EASTWOOD TO BOSSIER CITY TO STONEWALL...MOVING EAST AT 25
MPH.  HAIL SMALLER THAN THREE QUARTERS OF AN INCH HAS BEEN REPORTED
WITH THIS LINE OF THUNDERSTORMS.

IN ADDITION TO THE RISK OF SMALL HAIL...WINDS 40 TO 50 MPH ARE
EXPECTED WITH THESE STORMS.

STAY TUNED FOR FURTHER UPDATES FROM YOUR NATIONAL WEATHER SERVICE IN
SHREVEPORT.

LAT...LON 3300 9291 3266 9294 3252 9299 3228 9322
      3223 9394 3247 9371 3260 9366 3295 9363
TIME...MOT...LOC 1627Z 265DEG 23KT 3287 9353 3261 9355
          3248 9360 3231 9377

BUTTS

Local storm report, Dec 9, 10:40 AM CST, 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1040 AM CST TUE DEC 09 2008

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

1020 AM     HAIL             S BOSSIER CITY          32.52N 93.66W
12/09/2008  E0.50 INCH       BOSSIER            LA   TRAINED SPOTTER

            HAIL OCCURRED JUST SOUTH OF THE CENTURYTEL CENTER.

&&

JT

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 9, 4:35 AM CST	Tornado Warning	SHV	Panola	25 min
Dec 9, 7:14 AM CST	Severe Thunderstorm Warning	SHV	Cherokee, Smith	46 min
Dec 9, 8:51 AM CST	Special Weather Statement	SHV	Harrison	24 min
Dec 9, 9:18 AM CST	Special Weather Statement	SHV	Panola	42 min
Dec 9, 4:59 AM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	46 min
Dec 9, 5:04 AM CST	Tornado Warning	SHV	Bossier, Caddo, De Soto, Webster	41 min
Dec 9, 5:51 AM CST	Tornado Warning	SHV	De Soto, Red River	39 min
Dec 9, 6:19 AM CST	Tornado Warning	SHV	Bienville, Bossier, De Soto, Red River, Webster	56 min
Dec 9, 9:28 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Winn	32 min
Dec 9, 10:27 AM CST	Special Weather Statement	SHV	Bossier, Claiborne, Webster	63 min
Dec 9, 11:08 AM CST	Severe Thunderstorm Warning	SHV	Grant, LaSalle	37 min
Dec 9, 11:33 AM CST	Tornado Warning	SHV	Grant, LaSalle	42 min
Dec 9, 12:09 PM CST	Special Weather Statement	SHV	Union	51 min
Dec 9, 12:17 PM CST	Tornado Warning	SHV	Caldwell, LaSalle	28 min
Dec 9, 12:19 PM CST	Tornado Warning	SHV	Natchitoches, Sabine	41 min
Dec 9, 12:45 PM CST	Tornado Warning	SHV	Caldwell, LaSalle	30 min
Dec 9, 12:58 PM CST	Special Weather Statement	SHV	Union	62 min
Dec 9, 1:19 PM CST	Tornado Warning	SHV	Natchitoches, Sabine	41 min
Dec 9, 1:34 PM CST	Special Weather Statement	SHV	Natchitoches	56 min
Dec 9, 1:40 PM CST	Tornado Warning	SHV	Natchitoches, Winn	35 min
Dec 9, 1:57 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Winn	36 min
Dec 9, 2:22 PM CST	Special Weather Statement	SHV	Jackson	23 min
Dec 9, 2:27 PM CST	Severe Thunderstorm Warning	SHV	Natchitoches, Winn	20 min
Dec 9, 3:08 PM CST	Tornado Warning	SHV	Caldwell, Winn	37 min
Dec 9, 3:45 PM CST	Severe Thunderstorm Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Winn	30 min
Dec 9, 4:20 PM CST	Special Weather Statement	SHV	Caldwell, Grant, LaSalle	55 min
Dec 9, 5:34 PM CST	Areal Flood Advisory	SHV	Ouachita	56 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 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.