Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 193, NWS Shreveport, LA

April 30, 2011Cass County, Texas; Miller County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 30, 2011, 10:27 PM CDT for Cass County, Texas; Miller County, Arkansas. It was in force for 63 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: Apr 30, 2011, 10:27 PM CDT (03:27 UTC)
Expired: Apr 30, 2011, 11:30 PM CDT
In force: 63 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Miller County, AR, Cass County, TX

The radar

The Shreveport radar (KSHV), 87 km from the middle of the area, began a volume at 03:28 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, 5:55 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 3.5 hours before the alert went out and 87 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: 3108 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 891 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 170 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 13.1

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, 9:18 PM CDT, 1 hour 9 minutes earlier.

Area forecast discussion, Apr 30, 9:18 PM CDT, 1 hour 9 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
918 PM CDT SAT APR 30 2011

.DISCUSSION...
ISOLATED STRONG TO SEVERE TSTMS CONTINUE ACROSS NW CWA...WITH TOR
WATCH STILL IN EFFECT FOR NE TX...ALONG AND NORTH OF INTERSTATE
20...SE OK...AND SW AR...ALONG AND NORTH OF INTERSTATE 30...UNTIL
2 AM. THIS ACTIVITY AHEAD OF COLD FRONT...AND LITTLE DEVELOPMENT
UPSTREAM ALONG BOUNDARY. NO PCPN HAS DEVELOPED ALONG FRONT EITHER.
AS A RESULT...LOWERED OVERNIGHT POPS TO 50 PERCENT NW TO 20
PERCENT SE CWA OVERNIGHT./15/.

&&

.AVIATION...
ISOLD STG TSTMS ALONG A PREFRONTAL BAND...GENERALLY NEAR THE
INTERSTATE 30 CORRIDOR. STRONGEST CELL HEADED TOWARDS TXK
TERMINAL...BTWN 03-04Z...OTHERWISE...NO OTHER CONVECTION IMMINENT
FOR REMAINING TERMINALS. FOR THE MOST PART...VFR CIGS ACROSS MUCH OF
AREA...HOWEVER...MVFR CIGS CONTINUE TO PREVAIL AT ELD AND MLU
TERMINALS. S-SE WINDS 5 TO 10 KTS ACROSS AREA. EXPECT ONCE AGAIN FOR
MVFR CIGS TO ADVECT NORTHWARD AREAWIDE AFTER 06Z...AND ONCE AGAIN
MAY BREAK UP TO VFR BTWN 15-18Z...ON SUNDAY. AS COLD FRONT REACHES
TO NEAR THE INTERSTATE 30 CORRIDOR BTWN 21-24Z SUNDAY...CONVECTION
TO BECMG NUMEROUS NEAR BOUNDARY...AND WSHFT TO N-NE WITH A FEW STG
GUSTS. ASIDE FROM TXK...SLOW MOVG FROPA TO AFFECT REMAINING TERMINAL
SITES SOMETIME AFTER 0Z MONDAY./VII/.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  69  82  60  66  49 /  30  70  70  80  70
MLU  67  84  66  72  49 /  20  50  50  80  70
DEQ  60  70  51  58  42 /  40  90  80  80  50
TXK  65  77  54  61  47 /  40  90  80  80  70
ELD  67  81  59  66  46 /  30  90  70  80  70
TYR  69  79  53  64  45 /  40  70  70  70  70
GGG  69  83  55  64  47 /  40  60  70  80  70
LFK  72  84  63  75  49 /  30  30  50  50  70

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: ARZ050-051-059>061-070>073.

LA...NONE.
OK...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: OKZ077.

TX...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: TXZ096-097-108>112.

&&

Hazardous weather outlook, Apr 30, 12:14 PM CDT, 10 hours 13 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1214 PM CDT SAT APR 30 2011

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-011100-
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-
1214 PM CDT SAT APR 30 2011

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...
THUNDERSTORMS WILL DEVELOP LATER TODAY AND INCREASE IN AREAL
COVERAGE AND INTENSITY TONIGHT AS A COLD FRONT MOVES INTO THE
REGION. EXPECT LOCALLY HEAVY RAINFALL WITH AMOUNTS OF ONE TO THREE
INCHES BY LATE TONIGHT. THIS RAIN WILL OCCUR OVER AREAS THAT HAD
RECENTLY RECEIVED HEAVY RAIN. EXPECT RAPID WATER RUNOFF AND
POSSIBLE FLASH FLOODING OVER NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...
AND SOUTHWEST AND SOUTH CENTRAL ARKANSAS. THE AREA OF CONCERN IS
MAINLY NORTH OF AN EL DORADO ARKANSAS TO PITTSBURG TEXAS LINE.

ALSO...SOME STORMS WILL BE CAPABLE OF PRODUCING LARGE HAIL AND
DAMAGING WINDS THIS AFTERNOON INTO TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
STRONG TO SEVERE THUNDERSTORMS...WITH LARGE HAIL...HEAVY RAINFALL...AND
DAMAGING WINDS WILL BE POSSIBLE SUNDAY THROUGH MONDAY...AS A FRONT
MOVES ACROSS THE FOUR STATE REGION.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF HAM RADIO OPERATORS...EMERGENCY MANAGEMENT
PERSONNEL...AND STORM SPOTTER NETWORKS MAY BE NEEDED LATER THIS
AFTERNOON THROUGH TONIGHT.

In the hours before

Local storm report, Apr 30, 8:47 PM CDT, 1 hour 40 minutes before

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Local storm report, Apr 30, 9:27 PM CDT, 1 hour before

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Local storm report, Apr 30, 9:39 PM CDT, 48 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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Local storm report, Apr 30, 9:41 PM CDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
941 PM CDT SAT APR 30 2011

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

0934 PM     FUNNEL CLOUD     2 NE HUGHES SPRINGS     33.02N 94.61W
04/30/2011                   CASS               TX   LAW ENFORCEMENT

            STATE TROOPER REPORTS FUNNEL CLOUD 2 MILES NORTHEAST OF
            HUGHES SPRINGS

&&

MHEMINGW

Local storm report, Apr 30, 10:13 PM CDT, 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1013 PM CDT SAT APR 30 2011

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

0925 PM     TORNADO          2 S DAINGERFIELD        33.00N 94.72W
04/30/2011                   MORRIS             TX   TRAINED SPOTTER

            TORNADO ON GROUND MOVING NE AT 25 MPH.

&&

MHEMINGW

Local storm report, Apr 30, 10:21 PM CDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1021 PM CDT SAT APR 30 2011

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

1003 PM     HAIL             3 SE DOUGLASSVILLE      33.16N 94.31W
04/30/2011  M1.00 INCH       CASS               TX   LAW ENFORCEMENT

            STATE TROOPER REPORTED QUARTER SIZED HAIL

&&

MHEMINGW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 30, 7:03 PM CDT	Tornado Warning	SHV	Wood	42 min
Apr 30, 7:44 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Upshur, Wood	61 min
Apr 30, 8:26 PM CDT	Tornado Warning	SHV	Camp, Morris, Titus, Upshur	49 min
Apr 30, 9:02 PM CDT	Tornado Warning	SHV	Camp, Cass, Morris, Titus, Upshur	43 min
Apr 30, 9:44 PM CDT	Tornado Warning	SHV	Bowie, Cass	46 min
May 1, 7:52 AM CDT	Severe Thunderstorm Warning	SHV	Red River	53 min
May 1, 5:43 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Smith, Upshur, Wood	62 min
May 1, 6:19 PM CDT	Tornado Warning	SHV	Gregg, Harrison, Marion, Upshur	41 min
May 1, 6:10 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	35 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011 Severe Thunderstorm Warnings in Arkansas, 2011 Every severe thunderstorm warning in 2011

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.