Alert archive / Louisiana / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 133, NWS Shreveport, LA

May 8, 2007Caddo Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 8, 2007, 5:17 PM CDT for Caddo Parish, Louisiana. It was in force for 43 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 8, 2007, 5:17 PM CDT (22:17 UTC)
Expired: May 8, 2007, 6:00 PM CDT
In force: 43 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 15 km from the middle of the area, began a volume at 22:16 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, 10.3 hours before the alert went out and 17 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: 1828 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 543 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 35 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 8, 2:08 PM CDT, 3 hours 9 minutes earlier.

Area forecast discussion, May 8, 2:08 PM CDT, 3 hours 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
208 PM CDT TUE MAY 8 2007

.DISCUSSION...
NO MAJOR CHANGES TO WHAT WE/VE BEEN DISCUSSING FOR SEVERAL DAYS.
CLOSED LOWS OVER THE SOUTHERN ROCKIES AND OFF THE SE COAST WITH A
NARROW RIDGE BETWEEN...OVER OUR CWA. SCATTERED AFTERNOON
CONVECTION EXPECTED MOST OF THE WEEK AS THE RIDGE IS BECOMING
SOMEWHAT DIRTY. THE CLOSED LOW OVER THE ROCKIES WILL EVENTUALLY
WEAKEN A LITTLE AND MOVE EAST...AND MODELS STILL HAVE IT OVER THE
ARKLATEX AROUND FRIDAY. POSITION OF THE LOW LATE WEEK WILL HELP
DETERMINE HOW MUCH OR LITTLE PRECIP WE WILL GET. GFS CURRENTLY HAS
LOW MOVING SE INTO THE NORTHERN GULF...WITH OUR AREA ON THE WET
NORTHERN SIDE...WE WILL SEE HOW THAT SHAPES UP. A MORE NORTHERLY
TRACK FOR THAT LOW WILL RESULT IN LESS PRECIP. POPS IN THE CHANCE
CATEGORY MOST DAYTIME PERIODS. /17/

&&

.AVIATION...
UPPER LOW OVER THE SOUTHWEST U.S. WILL CONTINUE TO GIVE US A CHANCE
OF SHOWERS AND THUNDERSTORMS THIS AFTERNOON AND WEDNESDAY AFTERNOON.
LOW CLOUDS MAY RETURN LATE TONIGHT AND EARLY WEDNESDAY OVER EAST AND
NORTHEAST TEXAS AGAIN...PRODUCING MVFR CEILINGS DURING THE MORNING.
CONDITIONS WILL RETURN TO VFR BY EARLY AFTERNOON. WINDS WILL STAY
LIGHT AND NOT BE A FACTOR TO AVIATION...EXCEPT IN THE VICINITY OF
THUNDERSTORMS...WHERE GUSTY WINDS CAN OCCUR. /03/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  68  86  67  83 /  20  40  20  40
MLU  66  86  64  84 /  20  40  20  50
DEQ  63  83  62  81 /  20  50  20  50
TXK  66  84  65  82 /  20  40  20  50
ELD  64  86  63  84 /  20  40  20  50
TYR  67  85  64  82 /  20  40  20  40
GGG  67  85  64  83 /  20  40  20  40
LFK  66  87  64  84 /  20  30  20  30

&&

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

17/03

Hazardous weather outlook, May 8, 12:00 PM CDT, 5 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT TUE MAY 8 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>167-091100-
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 TUE MAY 8 2007

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

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

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TODAY ACROSS
PORTIONS OF THE FOUR STATE REGION. 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 TODAY OR
TONIGHT.

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

AN UPPER LEVEL STORM SYSTEM WILL APPROACH THE REGION BY THURSDAY
INTO FRIDAY. SCATTERED SHOWERS AND THUNDERSTORMS WILL LIKELY DEVELOP
WITH THE AID OF HEATING DURING THE AFTERNOON AND EVENING HOURS WITH
THE POSSIBILITY OF SEVERE THUNDERSTORMS ACROSS THE ENTIRE REGION BY
LATE IN THE WORK WEEK.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS...IS NOT EXPECTED TODAY OR TONIGHT.

17

In the hours before

Local storm report, May 8, 4:27 PM CDT, 50 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 8, 3:19 PM CDT	Severe Thunderstorm Warning	SHV	Cass	41 min
May 8, 6:01 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	29 min
May 8, 6:35 PM CDT	Severe Thunderstorm Warning	SHV	San Augustine	40 min
May 8, 2:53 PM CDT	Severe Thunderstorm Warning	SHV	Bienville	67 min
May 8, 4:19 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	26 min
May 8, 4:29 PM CDT	Severe Thunderstorm Warning	SHV	Webster	46 min
May 8, 5:11 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	34 min
May 8, 6:17 PM CDT	Severe Thunderstorm Warning	SHV	Union	43 min
May 8, 6:25 PM CDT	Severe Thunderstorm Warning	SHV	Lafayette, Miller	35 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.