Alert archive / Texas / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 346, NWS Shreveport, LA

May 27, 2008Cass County, Morris County, Titus County, Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 27, 2008, 11:54 AM CDT for Cass County, Morris County, Titus County, Texas. It was in force for 51 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 27, 2008, 11:54 AM CDT (16:54 UTC)
Expired
May 27, 2008, 12:45 PM CDT
In force
51 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon

Counties Cass County, TX, Morris County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 109 km from the middle of the area, began a volume at 16:56 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.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 4.9 hours before the alert went out and 246 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, Fort Worth, TX at 12:00Z on 2008-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1167 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, Fort Worth, TX at 12:00Z on 2008-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 213 square meters per square second.193958Sfc1 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
1167 J/kg
Mixed-layer CIN
-136 J/kg
Mixed-layer LCL
626 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
213 m²/s²
0-3 km storm-relative helicity
194 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.9

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 27, 10:56 AM CDT, 58 minutes earlier.

Area forecast discussion, May 27, 10:56 AM CDT, 58 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1056 AM CDT TUE MAY 27 2008

.DISCUSSION...

MCS REQUIRING FIRST PERIOD UPDATES TO MAX TEMPS...WINDS...POPS...
DEWPOINTS ETC TODAY. SOUTHWARD PROGRESS OF SYSTEM MAY MAKE PRECIP
LIKELY DOWN TO I 20 OF NE TX THIS AFTERNOON. ADDED POPS TO CENTRAL
LA AS WELL FOR THE AFTERNOON...AND BUMPED UP SHV TO 40 PERCENT.
EXPECT WINDS WHICH ARE CURRENTLY NELY OVER OUR NW PORTION OF
CA...WILL VEER BACK AROUND TO SOUTHERLY BY LATE AFTERNOON. /17/

&&

.AVIATION...

MCS CONTINUES TO DROP SOUTHWARD INTO N TX SLOWLY FORCING AN OUTFLOW
BOUNDARY INTO I-30 CORRIDOR.  MOST OF THE HEAVY...ACTIVE PART OF
THIS FEATURE CONTINUES TO MOVE TOWARD KTYR/KGGG.  ADDED COVERAGE
WILL LIKELY DEVELOP ALONG THE OUTFLOW INTO KTXK AND PERHAPS EVEN
KSHV AS HEATING BUILDS LATE AM/EARLY PM.  EXPECT THE USUAL MVFR/IFR
CONDITIONS TO ACCOMPANY HEAVY DOWNPOURS...BUT ELSEWHERE CIGS ARE
LIFTING AND THINNING.  SFC WINDS WILL CONTINUE S OR SW AROUND 10 KTS
EVEN BEHIND THE BOUNDARY AS THE WEAK COOL FRONT REMAINS OVER KANSAS
ATTM. THE FRONT IS TIGHT ON THE EASTERN SIDE OF THE UPPER RIDGE AND
IS TAKING ON A BACK DOOR POSTURE...BUT WE CAN EXPECT ANOTHER
NOCTURNAL MCS WHICH SHOULD HELP DROP IN A BRIEF NORTHERLY FLOW LATE
TOMORROW ALONG THE I-20 CORRIDOR. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  91  74  86  70 /  40  30  50  30
MLU  92  72  85  67 /  20  20  50  30
DEQ  85  67  84  65 /  60  60  50  20
TXK  87  70  84  69 /  60  40  50  20
ELD  90  69  84  66 /  60  40  50  20
TYR  90  73  87  69 /  40  30  50  30
GGG  91  73  87  68 /  40  30  50  30
LFK  93  73  91  68 /  20  10  50  30

&&

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

17/24
Hazardous weather outlook, May 27, 6:00 AM CDT, 5 hours 54 minutes before
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In the hours before

Special weather statement, May 27, 6:46 AM CDT, 5 hours 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
646 AM CDT TUE MAY 27 2008

OKZ077-271245-
MCCURTAIN-
646 AM CDT TUE MAY 27 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SPECIAL
WEATHER STATEMENT EFFECTIVE UNTIL 745 AM CDT FOR THE FOLLOWING COUNTY
IN SOUTHEAST OKLAHOMA
     MCCURTAIN

INCLUDING THE FOLLOWING LOCATIONS
     BATTIEST...BEACHTON...BETHEL...HOCHATOWN...MOUNT HERMAN...
     PICKENS...RINGOLD...SHERWOOD...SMITHVILLE AND WATSON

AT 636 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 15 MILES EAST OF NASHOBA...OR 25 MILES SOUTHEAST
OF CLAYTON...MOVING SOUTHEAST AT 46 MPH.

SMALL HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

LAT...LON 3411 9448 3412 9516 3416 9517 3417 9515
      3425 9515 3426 9514 3426 9505 3451 9505
      3451 9504 3452 9450
TIME...MOT...LOC 1146Z 316DEG 40KT 3434 9486
Local storm report, May 27, 11:11 AM CDT, 43 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1111 AM CDT TUE MAY 27 2008

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

1130 PM     TSTM WND DMG     13 N DIERKS             34.31N 94.02W
05/26/2008                   HOWARD             AR   EMERGENCY MNGR

            A FEW LARGE LIMBS AND ONE SMALL TREE DOWN IN ATHENS.

&&

17

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 12:08 PM CDTSevere Thunderstorm WarningSHVCamp, Harrison, Marion, Titus, Upshur52 min
May 27, 12:29 PM CDTSevere Thunderstorm WarningSHVGregg, Rusk, Smith46 min
May 27, 12:33 PM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Rusk, Smith, Upshur57 min
May 27, 12:45 PM CDTSevere Thunderstorm WarningSHVBowie, Cass, Marion60 min
May 27, 1:45 PM CDTSevere Thunderstorm WarningSHVBowie, Cass45 min
May 27, 2:09 PM CDTSevere Thunderstorm WarningSHVCass, Harrison, Marion, Panola66 min
May 27, 3:33 PM CDTSevere Thunderstorm WarningSHVAngelina, Nacogdoches, San Augustine, Shelby57 min
May 27, 3:08 PM CDTSevere Thunderstorm WarningSHVClaiborne, Webster37 min
May 26, 11:10 PM CDTSpecial Weather StatementSHVHoward50 min
May 26, 11:23 PM CDTSevere Thunderstorm WarningSHVHoward37 min
May 27, 2:22 PM CDTSevere Thunderstorm WarningSHVLafayette, Miller38 min

Nearby

Severe Thunderstorm Warnings in Texas, 2008Every severe thunderstorm warning in 2008

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.