Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 146, NWS Shreveport, LA

May 9, 2007Bossier Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 9, 2007, 5:51 PM CDT for Bossier Parish, Louisiana. It was in force for 54 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 9, 2007, 5:51 PM CDT (22:51 UTC)
Expired: May 9, 2007, 6:45 PM CDT
In force: 54 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Bossier Parish, LA

The radar

The Shreveport radar (KSHV), 34 km from the middle of the area, began a volume at 22:51 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 nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.9 hours before the alert went out and 26 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: 1186 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 708 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: -1 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 9, 3:44 PM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, May 9, 3:44 PM CDT, 2 hours 7 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
344 PM CDT WED MAY 9 2007

.DISCUSSION...
THIS PACKAGE HAS AN INCREASED POP FOR THIS EVENING...DROPPING OFF
AFTER MIDNIGHT.  RADAR TRENDS SEEM TO POINT TO ORGANIZED
CONVECTION OVER E TX...LIFTING TO THE NE FOR THE REMAINDER OF THE
AFTERNOON...AND PROB EARLY EVENING AS WELL. THERE IS STILL AN ISOLATED
SEVERE THREAT UNTIL AROUND SUNSET. ALTHOUGH FZL AND WET BULB ZERO
HTS ARE A GOOD BIT HIGHER TODAY. SO...RUNNING WITH A FEW LESS SVR
STORMS AT THIS POINT WHEN COMPARED TO THE LAST TWO DAYS ANYWAY.
CONVECTION OVER SE ARK IS HOLDING POSITION...BUT AN OUTFLOW FROM
THIS PERSISTENCE MAY YET DEVELOP. IF SO ALL THIS MAY COME TOGETHER
OVER NORTHERN SECTIONS LATER TODAY OR THIS EVENING. AS FOR
TOMORROW...MODEL POPS ARE SURPRISINGLY LOW. I ELECTED TO KEEP A
DECENT CHANCE AREAWIDE WITH THE LOW OVER THE SW US TAKING A
DECIDED JOG TO THE EAST TODAY. EVIDENCED BY TX CONVECTION LIFTING
NNE. AS FOR THE LOW OVER THE SE US...YESTERDAY SEEMED TO BE THE
DAY WERE IT HAD AN INFLUENCE OVER OUR AREA...WATER VAPOR SUGGEST
SOMETHING OF AN UPPER RIDGE OVER MID SOUTH AT THIS POINT. GFS AND
ECMWF FAIRLY CLOSE ON SW US LOW DRIFTING EAST ALONG GULF COAST
OVER THE NEXT COUPLE OR FEW DAYS. POPS SHOULD DROP BACK AS IT
PASSES BY DURING THE WEEKEND. MODEL BLENDED TEMPS/TDS WITH STILL A
SLIGHTLY LESS HUMID TREND...BUT STILL ABOVE AVERAGE HIGHS AND LOWS
ALL AROUND FOR THE NEXT WEEK. /24/

.AVIATION...
CONVECTION HAS FIRED ACROSS EAST TEXAS ALONG WHAT APPEARS TO BE A
BOUNDARY LEFT OVER FROM YESTERDAYS ACTIVITY. CEILINGS AT THE GGG
AND LFK TERMINALS HAVE BEEN UP AND DOWN DUE TO SCATTERED TSTMS.
ASIDE FROM THE CLOUD COVER ACROSS EAST TX...A CU FIELD ACROSS THE
REST OF THE TERMINAL SITES SHOULD DISSIPATE SHORTLY AFTER SUNSET.
AREAS THAT RECEIVE RAINFALL THIS EVENING WILL LIKELY SEE FOG TONIGHT
WITH VSBYS DROPPING DOWN TO 2 TO 4 MILES IN THE PREDAWN HOURS. /02/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  66  86  64  87 /  40  40  30  40
MLU  67  86  65  86 /  30  50  30  40
DEQ  64  83  63  84 /  40  50  30  40
TXK  66  84  63  85 /  50  50  30  40
ELD  64  85  62  86 /  50  50  30  40
TYR  66  83  63  86 /  30  40  30  40
GGG  65  84  62  86 /  30  40  30  40
LFK  65  86  63  87 /  20  40  30  40

&&

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

24/02

Hazardous weather outlook, May 9, 12:00 PM CDT, 5 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT WED MAY 9 2007

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-101100-
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-
1200 PM CDT WED MAY 9 2007

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TODAY ACROSS
PORTIONS OF THE FOUR STATE AREA WITH A VERY UNSTABLE ATMOSPHERE
EXPECTED THIS AFTERNOON AND THIS EVENING. A FEW OF THESE STORMS
COULD BECOME SEVERE PRODUCING LARGE HAIL AND DAMAGING WIND GUSTS.
HOWEVER...WIDESPREAD SEVERE THUNDERSTORMS ARE NOT EXPECTED THIS
AFTERNOON OR TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

AN UPPER LEVEL STORM SYSTEM WILL APPROACH THE AREA DURING THURSDAY
AND PERHAPS TAKE INTO FRIDAY AS WELL DEPENDING ON ITS SPEED. WE WILL
SEE SCATTERED SHOWERS AND THUNDERSTORMS LIKELY DEVELOP ON BOTH DAYS
WITH THE AID OF DAYTIME HEATING DURING THE AFTERNOON AND EVENING
HOURS. THERE WILL BE A SLIGHT RISK FOR SEVERE THUNDERSTORMS ACROSS
THE ENTIRE REGION DURING THURSDAY...AND PERHAPS FRIDAY TOO DEPENDING
ON THE POSITION AND SPEED OF THIS UPPER LEVEL FEATURE.  THE COMPUTER
MODELS TAKE TO SYSTEM ALONG THE I-10 CORRIDOR DURING THIS TIME FRAME.
STAY TUNED TO NOAA WEATHER RADIO FOR THE LATEST WEATHER INFORMATION
IN THE FOUR STATE AREA.

.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS...MAY BE NEEDED THIS AFTERNOON OR TONIGHT.

24

In the hours before

Local storm report, May 9, 3:05 PM CDT, 2 hours 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
305 PM CDT WED MAY 09 2007

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

0130 PM     HAIL             SMITHVILLE              34.47N 94.65W
05/09/2007  E0.75 INCH       MCCURTAIN          OK   POST OFFICE

            POST OFFICE REPORTED PENNY SIZE HAIL AND VERY HEAVY RAIN
            IN SMITHVILLE.

&&

18

Local storm report, May 9, 4:02 PM CDT, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
402 PM CDT WED MAY 09 2007

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

0359 PM     HAIL             STRONG                  33.11N 92.36W
05/09/2007  E1.00 INCH       UNION              AR   POST OFFICE

&&

18

Local storm report, May 9, 4:43 PM CDT, 1 hour 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
443 PM CDT WED MAY 09 2007

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

0403 PM     HAIL             JONESBORO               32.24N 92.71W
05/09/2007  E0.88 INCH       JACKSON            LA   TRAINED SPOTTER

&&

15

Local storm report, May 9, 5:43 PM CDT, 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
543 PM CDT WED MAY 09 2007

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

0500 PM     TSTM WND DMG     5 ESE HOMER             32.77N 92.98W
05/09/2007                   CLAIBORNE          LA   LAW ENFORCEMENT

            TWO TREES DOWN ON LAKE CLAIBORNE REPORTED BY OFF DUTY
            DEPUTY.

&&

24

Local storm report, May 9, 5:47 PM CDT, 4 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
547 PM CDT WED MAY 09 2007

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

0515 PM     TSTM WND DMG     HOMER                   32.79N 93.06W
05/09/2007                   CLAIBORNE          LA   AMATEUR RADIO

            SEVERAL TREES DOWN IN CITY LIMITS

&&

24

Local storm report, May 9, 5:50 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
550 PM CDT WED MAY 09 2007

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

0535 PM     TSTM WND DMG     HOMER                   32.79N 93.06W
05/09/2007                   CLAIBORNE          LA   AMATEUR RADIO

            TREES AND POWER LINES DOWN IN THE CITY LIMITS...BELLA
            VISTA AND LA HWY 2

&&

24

The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 8:22 PM CDT	Severe Thunderstorm Warning	SHV	Angelina	53 min
May 9, 1:58 PM CDT	Severe Thunderstorm Warning	SHV	Titus	47 min
May 9, 2:34 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches	30 min
May 9, 5:03 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne	42 min
May 9, 5:07 PM CDT	Severe Thunderstorm Warning	SHV	Bienville	53 min
May 9, 5:46 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne	30 min
May 9, 6:37 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Webster	38 min
May 9, 3:52 PM CDT	Severe Thunderstorm Warning	SHV	Union	38 min
May 9, 6:32 PM CDT	Severe Thunderstorm Warning	SHV	Nevada	58 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2007 Every severe thunderstorm warning in 2007

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.