Alert archive / Louisiana / Tornado Warnings in 2009

Tornado Warning 34, NWS Shreveport, LA

April 10, 2009Ouachita Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 10, 2009, 12:17 AM CDT for Ouachita Parish, Louisiana. It was in force for 43 min. 3 reports 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: Apr 10, 2009, 12:17 AM CDT (05:17 UTC)
Expired: Apr 10, 2009, 1:00 AM CDT
In force: 43 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Ouachita Parish, LA

The radar

The Shreveport radar (KSHV), 163 km from the middle of the area, began a volume at 05:17 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.

What was reported inside it

Time	Report	Where	Remark
Apr 10, 12:22 AM CDT	TORNADO	9 Sw Brownsville-Bawcom, LA	REPORT OF A TRAILER HOUSE BLOWN OVER ON JONESBORO ROAD...NO INJURIES
Apr 10, 12:25 AM CDT	HAIL 0.88	Monroe, LA
Apr 10, 12:28 AM CDT	HAIL 0.75	4 S West Monroe, LA

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 tornado warning; the first came 5 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 9, 9:10 PM CDT	Tornado Watch	SPC	4 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 5.3 hours before the alert went out and 154 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: 938 J/kg
Mixed-layer CIN: -186 J/kg
Mixed-layer LCL: 814 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 370 m²/s²
0-3 km storm-relative helicity: 290 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 4.5

Open this sounding in Storm Lab

The text

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

000 
WFUS54 KSHV 100517
TORSHV
LAC073-100600-
/O.NEW.KSHV.TO.W.0034.090410T0517Z-090410T0600Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
1217 AM CDT FRI APR 10 2009

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL OUACHITA PARISH IN NORTH CENTRAL LOUISIANA...
  THIS INCLUDES THE CITIES OF...WEST MONROE...SWARTZ...MONROE...
  CLAIBORNE...BROWNSVILLE-BAWCOMVILLE...

* UNTIL 100 AM CDT

* AT 1215 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 11 MILES
  SOUTHWEST OF BROWNSVILLE-BAWCOMVILLE...MOVING EAST AT 40 MPH.

* THE TORNADO WILL BE NEAR...
  8 MILES SOUTH OF CLAIBORNE BY 1225 AM CDT...
  BROWNSVILLE-BAWCOMVILLE AND 6 MILES SOUTH OF WEST MONROE BY 1230 AM
  CDT...
  RICHWOOD AND 6 MILES SOUTH OF MONROE BY 1235 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT FRIDAY MORNING FOR
SOUTH CENTRAL ARKANSAS AND NORTHWESTERN LOUISIANA.

&&

LAT...LON 3243 9195 3239 9199 3232 9201 3236 9235
      3241 9240 3241 9241 3250 9241 3263 9191
      3258 9191 3255 9190
TIME...MOT...LOC 0515Z 271DEG 35KT 3242 9233

$$

13

1 follow-up statement

000 
WWUS54 KSHV 100535
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1235 AM CDT FRI APR 10 2009

LAC073-100600-
/O.CON.KSHV.TO.W.0034.000000T0000Z-090410T0600Z/
OUACHITA LA-
1235 AM CDT FRI APR 10 2009

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 100 AM CDT FOR OUACHITA
PARISH...

AT 1233 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR WILDS...OR NEAR
BROWNSVILLE-BAWCOMVILLE...MOVING EAST AT 30 MPH. LARGE HAIL TO NEAR
ONE INCH IN DIAMETER WILL ALSO BE POSSIBLE WITH THIS STORM. 

THE TORNADO WILL BE NEAR...
  COBB AND THE SOUTH SIDE OF MONROE BY 1240 AM CDT...
  RICHWOOD...PINE GROVE...MAGENTA AND 6 MILES SOUTH OF EDGEWATER BY
  1245 AM CDT...
  MILLHAVEN BY 1255 AM CDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 200 AM CDT FRIDAY MORNING FOR
SOUTH CENTRAL ARKANSAS AND NORTHWESTERN LOUISIANA.

&&

LAT...LON 3243 9195 3239 9199 3232 9201 3236 9220
      3242 9227 3252 9224 3263 9191 3258 9191
      3255 9190
TIME...MOT...LOC 0533Z 268DEG 27KT 3243 9216

$$

13

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 Apr 9, 11:33 PM CDT, 44 minutes earlier.

Area forecast discussion, Apr 9, 11:33 PM CDT, 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1133 PM CDT THU APR 9 2009

.UPDATE...
TO REMOVE MANY WESTERN COUNTIES AND PARISHES FROM TOR WATCH 126.
DEW POINTS REMAIN HIGH OVER THESE AREAS...BUT THE MID LEVEL ENERGY
AND MAIN LIFT IS MOVING OUT AHEAD OF THE SURFACE BOUNDARY.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  77  58  69  49  72 /  30  30   0   0   0
MLU  78  62  72  49  71 /  20  50  10   0   0
DEQ  75  51  64  43  70 /  40  20   0   0   0
TXK  76  54  65  46  71 /  40  30   0   0   0
ELD  77  59  69  48  71 /  30  50   0   0   0
TYR  81  53  72  48  73 /  30  30   0   0  10
GGG  80  55  70  48  73 /  30  30   0   0  10
LFK  82  60  72  51  75 /  30  30  10  10  20

&&

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

24

Hazardous weather outlook, Apr 9, 12:06 PM CDT, 12 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1206 PM CDT THU APR 9 2009

ARZ050-051-059>061-070>073-LAZ001>006-010>014-OKZ077-TXZ096-097-
108>112-124>126-138-151-101715-
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-MCCURTAIN-
BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-HARRISON-
PANOLA-
1206 PM CDT THU APR 9 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...
THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS LATE THIS
AFTERNOON THROUGH THE EVENING HOURS ACROSS MCCURTAIN COUNTY IN
SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS...NORTHEAST TEXAS AS WELL
AS NORTHWEST AND NORTH CENTRAL LOUISIANA. A STRONG UPPER LEVEL
STORM SYSTEM...WITH A WELL DEFINED SURFACE LOW... WILL MOVE ACROSS
OKLAHOMA THIS AFTERNOON. STRONG TO SEVERE THUNDERSTORMS IN THE
FORM OF SUPERCELLS COULD DEVELOP IN THE AIRMASS AHEAD OF A
DRYLINE...ASSOCIATED WITH THIS LOW. THIS SEVERE WEATHER THREAT IS
VERY CONDITIONAL AS THERE IS A VERY STRONG CAPPING INVERSION IN
PLACE TODAY. MOISTURE RETURN IS ALSO IN QUESTION. HOWEVER...THE
CAP WILL LIKELY WEAKEN JUST WEST OR NEAR THE COUNTY WARNING AREA
BY LATE THIS AFTERNOON. THE END RESULT WILL BE SCATTERED SHOWERS
AND THUNDERSTORMS...SOME OF WHICH WILL HAVE THE LIKELIHOOD OF
PRODUCING STRONG AND DAMAGING WIND GUSTS ALONG WITH LARGE HAIL.
ISOLATED TORNADOES CANNOT BE RULED OUT...BUT A GREATER TORNADIC
THREAT EXISTS NORTH OF THE FOUR STATE REGION. THE STORMS WILL
LIKELY WEAKEN AS WE TRANSITION INTO THE LATE NIGHT HOURS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
OVER THE WEEKEND...A MUCH STRONGER STORM SYSTEM WILL AFFECT THE
FOUR STATE REGION DURING THE DAY EASTER SUNDAY INTO SUNDAY NIGHT.
THERE WILL HE A HEIGHTENED SEVERE WEATHER THREAT WITH LARGE
HAIL...HIGH AND DAMAGING WINDS...AND ISOLATED TORNADOES...ALONG
WITH LOCALLY HEAVY RAINFALL AND FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVITY WILL LIKELY BE NEEDED ACROSS SOUTHEAST
OKLAHOMA...AND PORTIONS OF NORTHEAST TEXAS AND SOUTHWEST ARKANSAS...
ALONG AND NORTH OF INTERSTATE 30. SOUTH OF INTERSTATE 30...SEVERE
WEATHER WILL BE MORE QUESTIONABLE...HOWEVER...SPOTTER ACTIVITATION
REMAINS A POSSIBILITY AS FAR SOUTH AS AROUND THE INTERSTATE 20 CORRIDOR.

LAZ017>022-TXZ136-137-149-150-152-153-165>167-101715-
SABINE LA-NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-SMITH-GREGG-
CHEROKEE-RUSK-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX-
1206 PM CDT THU APR 9 2009

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...
FURTHER SOUTH ACROSS THE DEEP EAST TEXAS LAKES COUNTRY OF
NORTHEAST TEXAS INTO WEST CENTRAL AND EAST CENTRAL LOUISIANA...
SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE AS WE
TRANSITION INTO THE LATE AFTERNOON HOURS...THROUGH THIS EVENING.
THE SEVERE WEATHER THREAT IS MAINLY NORTH OF THE
REGION...HOWEVER... STORMS COULD DEVELOP SOUTH ALONG THE DRYLINE
AND POSE A HAIL OR WIND THREAT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
OVER THE WEEKEND...A MUCH STRONGER STORM SYSTEM WILL AFFECT THE
FOUR STATE REGION DURING THE DAY EASTER SUNDAY INTO SUNDAY NIGHT.
THERE WILL HE A HEIGHTENED SEVERE WEATHER THREAT WITH LARGE
HAIL...HIGH AND DAMAGING WINDS...AND ISOLATED TORNADOES...ALONG
WITH LOCALLY HEAVY RAINFALL AND FLOODING.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL MOST LIKELY NOT BE NEEDED ACROSS THE
SOUTHERN THIRD OF DEEP EAST TEXAS AS WELL AS WEST CENTRAL AND EAST
CENTRAL LOUISIANA LATE THIS AFTERNOON AND TONIGHT.

In the hours before

Local storm report, Apr 9, 11:25 PM CDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1125 PM CDT THU APR 09 2009

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

1123 PM     HAIL             GIBSLAND                32.54N 93.05W
04/09/2009  M1.00 INCH       BIENVILLE          LA   LAW ENFORCEMENT

&&

ASTEVENS

Local storm report, Apr 9, 11:34 PM CDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1134 PM CDT THU APR 09 2009

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

1110 PM     HAIL             GIBSLAND                32.54N 93.05W
04/09/2009  E1.00 INCH       BIENVILLE          LA   NWS EMPLOYEE

            GIBSON EXIT ON I-20

&&

ASTEVENS

Local storm report, Apr 9, 11:49 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1149 PM CDT THU APR 09 2009

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

1047 PM     TSTM WND DMG     BOSSIER CITY            32.52N 93.66W
04/09/2009                   BOSSIER            LA   NWS EMPLOYEE

            MARGARET DRIVE AND GILBERT DRIVE. NUMEROUS TREES AND
            POWER LINES DOWN.

&&

ASTEVENS

Local storm report, Apr 9, 11:57 PM CDT, 20 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SHREVEPORT LA
1157 PM CDT THU APR 09 2009

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

1033 PM     TORNADO          SHREVEPORT              32.47N 93.80W
04/09/2009                   CADDO              LA   LAW ENFORCEMENT

            *** 1 INJ *** TREE FELL ON CAR. 3100 BLOCK OF ASTON.
            WOMAN TRAPPED IN CAR.

&&

ASTEVENS

Local storm report, Apr 10, 12:02 AM CDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1202 AM CDT FRI APR 10 2009

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

1050 PM     TORNADO          5 NW SHREVEPORT         32.52N 93.86W
04/09/2009                   CADDO              LA   LAW ENFORCEMENT

            *** 1 INJ *** 1 MALE TRANSPORTED TO LOCAL HOSPITAL FROM
            LAKEVIEW SUBDIVISION

&&

04

Local storm report, Apr 10, 12:14 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1214 AM CDT FRI APR 10 2009

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

1050 PM     TORNADO          3 SE BLANCHARD          32.56N 93.85W
04/09/2009                   CADDO              LA   FIRE DEPT/RESCUE

            ESTIMATED 10-15 RAIL CARS BLOWN OFF THE TRACK ALONG I-220
            AND CADDO LAKE.

&&

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 9:37 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	38 min
Apr 9, 9:50 PM CDT	Tornado Warning	SHV	Bossier, Caddo	39 min
Apr 9, 9:53 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	52 min
Apr 9, 9:54 PM CDT	Tornado Warning	SHV	Claiborne, Webster	51 min
Apr 9, 9:58 PM CDT	Tornado Warning	SHV	Bossier, Caddo	47 min
Apr 9, 10:13 PM CDT	Tornado Warning	SHV	Claiborne, Webster	47 min
Apr 9, 10:22 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	53 min
Apr 9, 10:33 PM CDT	Tornado Warning	SHV	Bossier, Webster	27 min
Apr 9, 10:39 PM CDT	Tornado Warning	SHV	Claiborne, Union	66 min
Apr 9, 10:52 PM CDT	Tornado Warning	SHV	Bienville, Webster	23 min
Apr 9, 11:12 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Lincoln, Webster	48 min
Apr 9, 11:48 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita	42 min

Nearby

Tornado Warnings in Louisiana, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.