Alert archive / Texas / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 91, NWS Shreveport, LA

May 1, 20105 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at May 1, 2010, 12:38 AM CDT for 5 counties in Texas. It was in force for 23 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 1, 2010, 12:38 AM CDT (05:38 UTC)
Expired: May 1, 2010, 1:01 AM CDT
In force: 23 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bowie County, TX, Franklin County, TX, Morris County, TX, Red River County, TX, Titus County, TX

The radar

The Shreveport radar (KSHV), 136 km from the middle of the area, began a volume at 05:41 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 30, 9:09 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 5.6 hours before the alert went out and 140 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: 2850 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 568 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 180 m²/s²
0-3 km storm-relative helicity: 213 m²/s²
Significant tornado parameter: 2.9
Supercell composite: 14.0

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 Apr 30, 9:39 PM CDT, 2 hours 59 minutes earlier.

Area forecast discussion, Apr 30, 9:39 PM CDT, 2 hours 59 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
939 PM CDT FRI APR 30 2010

.DISCUSSION...
HIGHLY UNSTABLE ATMOSPHERE OVER THE REGION THIS EVENING AND TORNADO
WATCH JUST RECENTLY UPGRADED TO A PDS. NORTHERN PORTION OF THE SHV
FORECAST AREA IS ON THE SOUTHERN END OF THE WATCH BUT STILL IN THE
FORMATION AREA OF POSSIBLE LONG TRACK TORNADOES. AT THIS TIME MOST
STORMS ARE FORMING ALONG A WIND SHIFT AND WEAK DRYLINE BOUNDARY
WHICH HAS MOVED INTO WESTERN MCCURTAIN COUNTY AND EXTENDS
SOUTHWEST TO NEAR QUITMAN IN EXTREME WESTERN WOOD COUNTY. THE
BOUNDARY IS ALMOST STATIONARY AT THIS TIME. WITH THIS IN
MIND...WILL KEEP POPS HIGH IN WESTERN AREAS THROUGHOUT THE NIGHT
AND KEEP CHANCE POPS IN THE SOUTHEASTERN AREAS. GRIDDED TEMPS AND
DEWPOINTS ALREADY REFLECT THIS SO...NO CHANGES NEEDED. WINDS WILL
BE ADJUSTED TO FIT THE BOUNDARY.

UPDATE OUT SHORTLY AND WILL INCLUDE THE UPDATED TORNADO WATCH.

&&

.AVIATION...
STRONG CONVECTION CONTINUES THIS EVENING ACROSS MUCH OF NORTHEAST
TEXAS...SOUTHEAST OKLAHOMA...AND SOUTH ARKANSAS. THIS CONVECTIVE
ACTIVITY WILL PERIODICALLY INFLUENCE AREA TERMINALS THROUGHOUT THE
REMAINDER OF THE OVERNIGHT HOURS...WITH THE MAIN THREAT BEING STRONG
WINDS AND HAIL. OTHERWISE...CEILINGS EXPECTED TO BECOME IFR
OVERNIGHT AS LOW-LEVEL MOISTURE INCREASES WITH SOUTHERLY WINDS
PERSISTING THROUGHOUT MUCH OF THE TERMINAL FORECAST PERIOD. /05/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  72  82  68  78  54 /  70  60  50  20  20
MLU  73  83  70  77  54 /  70  60  50  40  20
DEQ  70  79  60  76  49 /  70  50  40  20  10
TXK  72  81  64  77  53 /  70  60  50  20  10
ELD  73  82  68  77  53 /  70  70  50  30  20
TYR  69  81  62  78  54 /  50  50  30  20  10
GGG  71  82  64  78  54 /  50  50  40  20  10
LFK  73  82  70  81  55 /  40  40  30  20  20

&&

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

14/05

Hazardous weather outlook, Apr 30, 11:51 AM CDT, 12 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1151 AM CDT FRI APR 30 2010

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-011700-
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-SABINE LA-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
1151 AM CDT FRI APR 30 2010

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

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

THE ATMOSPHERE ACROSS THE AREA IS RIPE FOR SEVERE THUNDERSTORMS
THIS AFTERNOON...AS AN ABUNDANCE OF MOISTURE IS ALREADY
AVAILABLE. THE ONLY INHIBITING FACTOR IS A TEMPERATURE CAPPING
INVERSION. SUFFICENT DAYTIME HEATING...PARTICULARLY OVER THE RED
RIVER VALLEY REGION WHERE MORE BREAKS IN OVERCAST SKIES ARE
OBSERVED...MAY BREAK THIS CAP. SHOULD THIS OCCUR...THUNDERSTORM
DEVELOPMENT WILL OCCUR VERY RAPIDLY. IN ADDITION...THUNDERSTORMS
DEVELOPING ALONG A DRY LINE...LOCATED NEAR THE INTERSTATE 35
CORRIDOR...WILL MOVE SLOWLY EAST TOWARDS THE AREA. FOR BOTH OF
THESE REASONS...STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE
LATER THIS AFTERNOON AND EVENING...PRODUCING LARGE HAIL...DAMAGING
STRAIGHT LINE WINDS...AND POSSIBLE ISOLATED TORNADOES.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...

ANOTHER SEVERE WEATHER OUTBREAK WILL BE POSSIBLE SATURDAY
AFTERNOON...INTO SATURDAY NIGHT...AS A COLD FRONT MOVES THROUGH
THE DEEP SOUTH. TORNADIC ACTIVITY WILL BE POSSIBLE AGAIN...AS
STRONG SUPERCELLS WILL LIKELY DEVELOP ALONG AND AHEAD OF THE
PROGRESSING COLD FRONT. LARGE HAIL AND DAMAGING STRAIGHT LINE
WINDS WILL ALSO BE POSSIBLE. IF THIS COLD FRONT STALLS OUT OVER
THE AREA...THIS SEVERE WEATHER EPISODE MAY LAST THROUGH EARLY
SUNDAY MORNING OVER PORTIONS OF NORTHERN LOUISIANA AND SOUTHWEST ARKANSAS.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF EMERGENCY MANAGEMENT OFFICIALS...HAM RADIO
OPERATORS...AND STORM SPOTTERS WILL BE NEEDED THIS WEEKEND...POSSIBLY
AS EARLY AS LATE THIS AFTERNOON. PLEASE STAY TUNED ANY
STATEMENTS...WATCHES...OR WARNINGS CONCERNING THIS HAZARDOUS
WEATHER EVENT.

VII

In the hours before

Local storm report, Apr 30, 9:14 PM CDT, 3 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
914 PM CDT FRI APR 30 2010

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

0835 PM     TSTM WND DMG     1 W DIERKS              34.12N 94.04W
04/30/2010                   HOWARD             AR   EMERGENCY MNGR

            POSSIBLE TORNADO DAMAGE. ROOF BLOWN OFF LAUNDRY MAT.
            STORAGE BUILDINGS DESTROYED ON EAST END OF TOWN ON HWY
            70. TREE DOWN ON MURRAY AVE.

&&

ASTEVENS

Local storm report, Apr 30, 9:43 PM CDT, 2 hours 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
943 PM CDT FRI APR 30 2010

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

0940 PM     TSTM WND DMG     5 E ROSSTON             33.59N 93.19W
04/30/2010                   NEVADA             AR   EMERGENCY MNGR

            POSSIBLE TORNADO DAMAGE. POWER OUT ACROSS THE CITY OF
            ROSSTEN AND THE SURROUNDING AREA.

&&

ASTEVENS

Local storm report, Apr 30, 9:47 PM CDT, 2 hours 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
947 PM CDT FRI APR 30 2010

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

0941 PM     FUNNEL CLOUD     1 N WINTHROP            33.85N 94.35W
04/30/2010                   LITTLE RIVER       AR   TRAINED SPOTTER

            FUNNEL CLOUD HALFWAY TO THE GROUND. STORM TRACKING
            NORTHEAST.

&&

ASTEVENS

Local storm report, Apr 30, 10:05 PM CDT, 2 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1005 PM CDT FRI APR 30 2010

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

1004 PM     HAIL             LOCKESBURG              33.97N 94.17W
04/30/2010  M1.00 INCH       SEVIER             AR   PUBLIC

&&

ASTEVENS

Local storm report, Apr 30, 10:24 PM CDT, 2 hours 14 minutes before

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Local storm report, Apr 30, 11:10 PM CDT, 1 hour 28 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:47 PM CDT	Severe Thunderstorm Warning	SHV	Red River	58 min
Apr 30, 8:47 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	58 min
May 1, 6:34 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	26 min
May 1, 6:54 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	36 min
Apr 30, 7:29 PM CDT	Tornado Warning	SHV	Little River, Sevier	46 min
Apr 30, 8:08 PM CDT	Tornado Warning	SHV	Howard, Sevier	52 min
Apr 30, 9:28 PM CDT	Tornado Warning	SHV	Howard, Little River, Sevier	47 min
Apr 30, 9:35 PM CDT	Tornado Warning	SHV	Nevada	25 min
Apr 30, 10:09 PM CDT	Tornado Warning	SHV	Howard, Sevier	51 min
May 1, 6:15 PM CDT	Tornado Warning	SHV	Union	31 min

Nearby

Severe Thunderstorm Warnings in Texas, 2010 Every severe thunderstorm warning in 2010

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.