Alert archive / Louisiana / Tornado Warnings in 2009

Tornado Warning 73, NWS Shreveport, LA

October 29, 2009Union Parish, Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this tornado warning at Oct 29, 2009, 1:55 PM CDT for Union Parish, Louisiana; Union County, Arkansas. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Oct 29, 2009, 1:55 PM CDT (18:55 UTC)
Expired: Oct 29, 2009, 2:30 PM CDT
In force: 35 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Union County, AR, Union Parish, LA

The radar

The Shreveport radar (KSHV), 156 km from the middle of the area, began a volume at 18:56 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 29, 1:14 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.9 hours before the alert went out and 147 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: 387 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 350 m²/s²
0-3 km storm-relative helicity: 422 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KSHV 291855
TORSHV
ARC139-LAC111-291930-
/O.NEW.KSHV.TO.W.0073.091029T1855Z-091029T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
155 PM CDT THU OCT 29 2009

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  NORTH CENTRAL UNION PARISH IN NORTH CENTRAL LOUISIANA...
  EASTERN UNION COUNTY IN SOUTH CENTRAL ARKANSAS...

* UNTIL 230 PM CDT

* AT 152 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 8 MILES SOUTH OF
  URBANA...OR 13 MILES EAST OF JUNCTION CITY...MOVING NORTH AT 55
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LAWSON AND CALION...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

&&

LAT...LON 3297 9242 3303 9262 3337 9254 3336 9252
      3333 9251 3333 9245 3331 9245 3328 9242
      3330 9233 3328 9231
TIME...MOT...LOC 1855Z 199DEG 46KT 3310 9248

$$

03

1 follow-up statement

000 
WWUS54 KSHV 291906
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
206 PM CDT THU OCT 29 2009

ARC139-LAC111-291930-
/O.CON.KSHV.TO.W.0073.000000T0000Z-091029T1930Z/
UNION AR-UNION LA-
206 PM CDT THU OCT 29 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR UNION
COUNTY...AND UNION PARISH...

AT 203 PM CDT...A TORNADO WAS REPORTED.  THIS TORNADO WAS LOCATED
NEAR URBANA...OR 13 MILES EAST OF EL DORADO...MOVING NORTH AT 55 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PIGEON
HILL AND CALION

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 3297 9242 3303 9262 3337 9254 3336 9252
      3333 9251 3333 9245 3331 9245 3328 9242
      3330 9233 3328 9231
TIME...MOT...LOC 1906Z 199DEG 46KT 3323 9243

$$

03

What forecasters said that day

The local office's own words before this tornado 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 tornado warning went out at Oct 29, 1:24 PM CDT, 31 minutes earlier.

Area forecast discussion, Oct 29, 1:24 PM CDT, 31 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
124 PM CDT THU OCT 29 2009

.DISCUSSION...
UPDATED TO INCLUDE TORNADO WATCH...IN EFFECT UNTIL 6 PM ACROSS
PORTIONS OF NE TX AND SE OK...IN EFFECT REMAINDER OF NE TX...AS
WELL AS ALL OF NORTHERN LA AND SW AR...UNTIL 9 PM. SOME LOCAL
FLOODING POSSIBLE AFTN AND EARLY EVENING...BUT MAIN THREAT DURING
THIS TIME FRAME IS TORNADIC...WITH INCREASING ROTATION INDICATED
IN CURRENT STORMS./VII/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  80  55  60  45  67 /  70 100  80  40  10
MLU  79  62  65  46  63 /  60 100 100  60  30
DEQ  77  54  58  42  62 /  70 100  60  20  10
TXK  76  55  60  43  62 /  70 100  80  40  10
ELD  75  55  60  43  62 /  60 100  80  40  10
TYR  81  52  58  44  66 /  70 100  60  20  10
GGG  82  54  59  42  66 /  70 100  80  40  10
LFK  84  56  64  43  69 /  70 100  80  40  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...LAKE WIND ADVISORY UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
     ZONES: ARZ050-059-070.

     FLASH FLOOD WATCH THROUGH FRIDAY MORNING FOR THE FOLLOWING
     ZONES: ARZ050-051-059>061-070>073.

LA...LAKE WIND ADVISORY UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
     ZONES: LAZ001-002-010-011-017-018.

     FLASH FLOOD WATCH THROUGH FRIDAY MORNING FOR THE FOLLOWING
     ZONES: LAZ001>006-010>014-017>022.

OK...LAKE WIND ADVISORY UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
     ZONES: OKZ077.

     FLASH FLOOD WATCH THROUGH FRIDAY MORNING FOR THE FOLLOWING
     ZONES: OKZ077.

TX...LAKE WIND ADVISORY UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING
     ZONES: TXZ096-097-108>112-124>126-136>138-149>153-165>167.

     FLASH FLOOD WATCH THROUGH FRIDAY MORNING FOR THE FOLLOWING
     ZONES: TXZ096-097-108>112-124>126-136>138-149>153-165>167.

&&

Hazardous weather outlook, Oct 29, 11:56 AM CDT, 1 hour 59 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1156 AM CDT THU OCT 29 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>167-301700-
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-
1156 AM CDT THU OCT 29 2009

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...THIS AFTERNOON AND TONIGHT...

AN UPPER LEVEL DISTURBANCE...COMBINED WITH A SLOW MOVING SURFACE
COLD FRONT AND RICH LOW LEVEL MOISTURE...WILL PROVIDE FOR
WIDESPREAD SHOWERS AND THUNDERSTORMS TODAY AND TONIGHT. SOME OF
THESE STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL...DAMAGING
WINDS...AND ISOLATED TORNADOES. FLOODING WILL BE A SIGNIFICANT
CONCERN WITH RAINFALL TOTALS AVERAGING AROUND 3 TO 6 INCHES
AREAWIDE...INCLUDING ISOLATED AMOUNTS OF UP TO 7 INCHES POSSIBLE
THROUGH FRIDAY. THE MOST LIKELY LOCATING FOR THE HIGHEST RAINGALL
TOTALS WIL BE ACROSS NORTHWEST LOUISIANA.

ALTHOUGH THERE WILL BE A POTENTIAL FOR BOTH SEVERE WEATHER AND
FLOODING THIS AFTERNOON AND OVERNIGHT...THE MAIN TORNADIC THREAT
WITH BE WITH THE PREFRONTAL STORMS THIS AFTERNOON...ESPECIALLY
ACROSS NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA...IN ASSOCIATION
WITH STORMS THAT ARE CURRENTLY STILL DEVELOPING. THE MAIN THREAT
FOR SIGNIFICANT FLOODING WILL BE TONIGHT...AS WELL AS POSSIBLE
STRONG TO DAMAGING STRAIGHT LINE WINDS ASSOCIATED WITH A SLOW
MOVING SQUALL LINE ENTERING NORTHEAST TEXAS AND SOUTHEAST OKLAHOMA
DURING THE EVENING FROM THE WEST.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

HEAVY RAIN WILL LINGER INTO MUCH OF THE DAY FRIDAY...WITH A
CONTINUED FLOODING THREAT.

.SPOTTER INFORMATION STATEMENT...
ACTIVATION OF STORM SPOTTERS WILL LIKELY BE REQUIRED THIS
AFTERNOON AND EVENING. LOCAL FLOODING ALSO POSSIBLE THIS
AFTERNOON...BECOMING MORE LIKELY AREAWIDE TONIGHT AND FRIDAY.
EMERGENCY MANAGERS NEED TO PREPARE FOR POSSIBLE SIGNIFICANT FLOODING.

VII

In the hours before

Local storm report, Oct 29, 1:10 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
110 PM CDT THU OCT 29 2009

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

0104 PM     TSTM WND DMG     BOSSIER CITY            32.52N 93.66W
10/29/2009                   BOSSIER            LA   BROADCAST MEDIA

            TREES AND POWERLINES DOWN AT CHANDLER RD. AND HWY 80 OR
            ABOUT 6 MILES EAST OF LOUISIANA DOWNS

&&

12

Local storm report, Oct 29, 1:40 PM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
140 PM CDT THU OCT 29 2009

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

0101 PM     TSTM WND DMG     BOSSIER CITY            32.52N 93.66W
10/29/2009                   BOSSIER            LA   AMATEUR RADIO

            TREES ACROSS I-20 AT MILE MARKER 30

&&

12

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 29, 3:41 AM CDT	Lake Wind Advisory	SHV	Bossier, Caddo, De Soto, Natchitoches, Red River, Sabine	15 hr
Oct 29, 10:01 AM CDT	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	11 days
Oct 29, 10:22 AM CDT	River Flood Warning	SHV	Lincoln, Ouachita, Union	7 days
Oct 29, 1:16 PM CDT	Tornado Warning	SHV	Bienville, Red River	29 min
Oct 29, 1:19 PM CDT	Severe Thunderstorm Warning	SHV	Lincoln, Union	26 min
Oct 29, 1:22 PM CDT	Tornado Warning	SHV	Lincoln, Union	23 min
Oct 29, 1:33 PM CDT	Tornado Warning	SHV	Lincoln, Union	27 min
Oct 29, 3:16 PM CDT	Tornado Warning	SHV	Bossier, Caddo	44 min
Oct 29, 3:54 PM CDT	Tornado Warning	SHV	Bossier, Caddo	36 min
Oct 29, 3:56 PM CDT	Tornado Warning	SHV	Bossier	14 min
Oct 29, 4:20 PM CDT	Tornado Warning	SHV	Bossier, Caddo, Webster	25 min
Oct 29, 4:52 PM CDT	Flash Flood Warning	SHV	Webster	4 hr
Oct 29, 5:03 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	42 min
Oct 29, 5:07 PM CDT	Severe Thunderstorm Warning	SHV	Webster	38 min
Oct 29, 5:24 PM CDT	Flash Flood Warning	SHV	Bossier, Caddo	4 hr
Oct 29, 5:27 PM CDT	Tornado Warning	SHV	Caddo	48 min
Oct 29, 5:49 PM CDT	Tornado Warning	SHV	Bossier, Caddo	41 min
Oct 29, 5:58 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	47 min
Oct 29, 6:16 PM CDT	Flash Flood Warning Emergency	SHV	Bossier, Caddo, De Soto	3 hr
Oct 29, 6:28 PM CDT	Tornado Warning	SHV	Bossier, Caddo	47 min
Oct 29, 6:48 PM CDT	Tornado Warning	SHV	Claiborne, Union	42 min
Oct 29, 2:56 PM CDT	Tornado Warning	SHV	Union	34 min
Oct 29, 4:57 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	37 min
Oct 29, 5:27 PM CDT	Tornado Warning	SHV	Columbia, Nevada	33 min
Oct 29, 6:35 PM CDT	Tornado Warning	SHV	Columbia, Nevada	25 min
Oct 29, 6:41 PM CDT	Tornado Warning	SHV	Miller	34 min
Oct 29, 6:49 PM CDT	Tornado Warning	SHV	Little River, Sevier	41 min

Nearby

Tornado Warnings in Louisiana, 2009 Tornado Warnings in Arkansas, 2009 Every tornado warning in 2009 Tornadoes 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; radar from the NEXRAD Level II archive.