Alert archive / Texas / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 137, NWS Shreveport, LA

May 8, 2007San Augustine County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 8, 2007, 6:35 PM CDT for San Augustine County, Texas. 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
May 8, 2007, 6:35 PM CDT (23:35 UTC)
Expired
May 8, 2007, 7:15 PM CDT
In force
40 min
Issued by
NWS Shreveport, LA
Area
Counties, with a storm outline in the text

County San Augustine County, TX

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.6 hours before the alert went out and 127 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2007-05-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1828 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2007-05-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -9 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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, 4 hours 27 minutes earlier.

Area forecast discussion, May 8, 2:08 PM CDT, 4 hours 27 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, 6 hours 35 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, 2 hours 8 minutes before
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Local storm report, May 8, 5:33 PM CDT, 1 hour 2 minutes before
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Local storm report, May 8, 5:36 PM CDT, 59 minutes before
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Local storm report, May 8, 5:43 PM CDT, 52 minutes before
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Local storm report, May 8, 6:09 PM CDT, 26 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
May 8, 3:19 PM CDTSevere Thunderstorm WarningSHVCass41 min
May 8, 6:01 PM CDTSevere Thunderstorm WarningSHVBowie29 min
May 8, 2:53 PM CDTSevere Thunderstorm WarningSHVBienville67 min
May 8, 4:19 PM CDTSevere Thunderstorm WarningSHVSabine26 min
May 8, 4:29 PM CDTSevere Thunderstorm WarningSHVWebster46 min
May 8, 5:11 PM CDTSevere Thunderstorm WarningSHVBossier34 min
May 8, 5:17 PM CDTSevere Thunderstorm WarningSHVCaddo43 min
May 8, 6:17 PM CDTSevere Thunderstorm WarningSHVUnion43 min
May 8, 6:25 PM CDTSevere Thunderstorm WarningSHVLafayette, Miller35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2007Every 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.