Alert archive / Arkansas / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 103, NWS Shreveport, LA

April 10, 2013Columbia County, Nevada County, Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 10, 2013, 6:31 PM CDT for Columbia County, Nevada County, Union County, Arkansas. It was in force for 44 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 10, 2013, 6:31 PM CDT (23:31 UTC)
Expired: Apr 10, 2013, 7:15 PM CDT
In force: 44 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Columbia County, AR, Nevada County, AR, Union County, AR

The radar

The Shreveport radar (KSHV), 125 km from the middle of the area, began a volume at 23:31 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 10, 1:20 PM CDT	Tornado Watch	SPC	10 hr
Apr 10, 5:42 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.5 hours before the alert went out and 117 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: 1882 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 502 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 242 m²/s²
0-3 km storm-relative helicity: 281 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 3.5

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 10, 6:05 PM CDT, 26 minutes earlier.

Area forecast discussion, Apr 10, 6:05 PM CDT, 26 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
605 PM CDT WED APR 10 2013

.DISCUSSION...
AT 2350Z...COLD FRONT WAS LOCATED FROM JUST WEST OF KELD...TO
HOMER...TO MANY. SCATTERED CONVECTION HAS BEGUN TO DEVELOP AHEAD
OF THE FRONT. TEMPS IN THE WARM SECTOR HAVE SOARED INTO THE LOW
80S WHILE DEWPOINTS HAVE RISEN INTO THE UPPER 60S TO NEAR 70
DEGREES F. THUS...CONDITIONS HAVE BECOME MORE CONDUCIVE FOR SEVERE
CONVECTION AHEAD OF THE FRONT. AFTER COORDINATING WITH SPC AND WFO
JAN...A NEW TOR WATCH HAS BEEN ISSUED FOR UNION CO AR AND N CNTRL
LA THRU 06Z.

FARTHER WEST...TORANDO THREAT HAS DIMINISHED AS THE POST-FRONTAL
CONVECTION IS ELEVATED. CANNOT RULE OUT AN ISOLATED DAMAGING WIND
GUST OR SVR HAIL REPORT WITH THIS ACTIVITY. /09/

&&

.PREV DISCUSSION... /ISSUED 305 PM CDT WED APR 10 2013/

DISCUSSION...
THIS AFTERNOONS WATER VAPOR SATELLITE IMAGERY OFFERS A NICE VIEW
OF THE SHARPLY ELONGATED UPPER TROUGH SPINNING ACROSS THE CENTRAL
UNITED STATES. ALSO NOTICEABLE IS AN AREA OF SHOWERS AND THUNDERSTORMS
EXTENDING FROM EASTERN TEXAS THROUGH THE OHIO RIVER VALLEY.

THE SURFACE BASED COLD FRONT THAT HAS BEEN RESPONSIBLE FOR FALLING
TEMPERATURES TO THE WEST HAS SLOWLY BEEN DRIFTING EASTWARD THIS
AFTERNOON. AS OF 19Z...IT WAS ORIENTED ROUGHLY ALONG A LINE FROM
CONROE TO MARSHALL TEXAS...NORTHWARD TO MENA ARKANSAS. FOR
NOW...HAVE TORNADO WATCH NUMBER 89 IN EFFECT FOR SOUTHWEST
ARKANSAS COUNTIES. AS THE COLD FRONT CONTINUES TO DRIFT EASTWARD...EXPECT
ADDITIONAL ACTIVITY TO DEVELOP IN ITS ADVANCE.

NORTHERN LOUISIANA AND SOUTH CENTRAL ARKANSAS SHOULD HAVE A BETTER
ENVIRONMENT FOR SEVERE WEATHER THIS EVENING. WITH NEARLY 2000
J/KG OF MUCAPE AND 30 KTS OF BULK SHEAR IN PLACE ALREADY...ALL THAT THE
ENVIRONMENT NEEDS IS INTERACTION WITH THE FRONT TO BREAK THE
SMALL CAP IN PLACE ACROSS THOSE AREAS. EXPECT SHOWERS AND
THUNDERSTORMS TO CONGEAL AND FORM INTO MORE OF A SUBSTANTIAL LINE
DURING THE EVENING AND OVERNIGHT HOURS...WITH DAMAGING WINDS BEING
THE PRIMARY SEVERE WEATHER THREAT. OTHER THAN ISOLATED TORNADOES
AND HAIL...HEAVY RAINFALL WILL BE A THREAT THIS EVENING...AS THE
UPPER LEVEL FLOW RUNS SOUTH TO NORTH...NOT PROVIDING MUCH OF AN
EASTWARD KICK TO THE SURFACE FRONT. THIS WILL ALLOW FOR QUITE A
BIT OF TRAINING OF STORMS AND LOCALIZED FLASH FLOODING MAY BE A
POSSIBILITY.

LOOKING TO THE WEST...IN THE POST FRONTAL COOLER AIR
MASS...ELEVATED CONVECTION WILL BE ONGOING THIS EVENING AND
OVERNIGHT. SMALL HAIL MAY BE POSSIBLE WITH THESE THUNDERSTORMS.
RAIN CHANCES WILL GRADUALLY COME TO AN END FOR SOUTHEAST OKLAHOMA
AND NORTHEAST TEXAS BY THURSDAY MORNING...WHILE AREAS FARTHER EAST
MAY BE DEALING WITH SHOWER/THUNDERSTORM ACTIVITY THROUGH THE EARLY AFTERNOON.

A FEW DRY DAYS WILL FOLLOW THIS DEPARTING SYSTEM...WITH SLIGHT
RAIN CHANCES RETURNING LATER THIS WEEKEND AS SOUTHWESTERLY FLOW
USHERS IN A FEW DISTURBANCES TOWARD THE AREA. OTHERWISE...WARMER
TEMPERATURES WILL RETURN FRIDAY. /20/

AVIATION...
THE COLD FRONT IS WAY AHEAD OF SCHEDULE...REMAINING VERY SHALLOW.
THE SFC FRONT EXTENDS FROM KTXK...TO NEAR KSHV...TO NEAR KLFK ATTM
WITH NW10G20KTS DISPLACING S/SE10G20KTS. THE WARM AND UNSTABLE DEEP
S/SW FLOW ALOFT WILL REMAIN FOR HRS OVER THE SFC FRONT KEEPING
ELEVATED SCAT/NUMEROUS TSTMS GOING THIS P.M. WITH HAIL UNTIL THE
UPPER LOW LIFTS OUT. ANY SFC BASED DEVELOPMENT AHEAD OF THE FRONT
MAY HOLD OUT FOR LATE DAY SUN OVER TOLEDO BEND COUNTRY UP INTO KELD
AND EAST. THE SFC FRONT SHOULD BE NEAR A KMLU TO KAEX BY 11/06Z WITH
TSTMS ENDING W TO E 03-09Z. EXPECT STRONG WIND AND SEVERE TURBULENCE
WITH SOME HAIL AND IFR CIGS/VSBY WITH THESE STORMS TODAY. AFTER
FROPA...EXPECT MVFR/IFR CIGS/VSBY IN -RA/BR 09-12Z WITH MVFR CIGS
BECMG SKC BY 15-18Z. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  48  63  43  73  47 /  90  20   0   0   0
MLU  54  66  45  71  45 /  90  50   0   0   0
DEQ  39  60  36  66  40 /  70  10   0   0  10
TXK  44  61  41  70  45 /  90  10   0   0  10
ELD  48  63  40  73  41 /  90  20   0   0   0
TYR  38  63  41  72  47 /  40  10   0   0   0
GGG  41  62  41  72  46 /  70  10   0   0   0
LFK  41  67  44  74  47 /  70  10   0   0   0

&&

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

09

Hazardous weather outlook, Apr 10, 6:15 PM CDT, 16 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
615 PM CDT WED APR 10 2013

ARZ050-051-059>061-070>072-111200-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-
615 PM CDT WED APR 10 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
ARKANSAS.

.DAY ONE...TONIGHT...

...A TORNADO WATCH IS IN EFFECT UNTIL 8 PM CDT TONIGHT...

SCATTERED THUNDERSTORMS CONTINUE ACROSS SOUTHWEST ARKANSAS AS A
COLD FRONT SLOWLY MOVES ACROSS THE AREA. THE TORNADO THREAT WILL
CONTINUE TO GRADUALLY DIMINISH THIS EVENING. HOWEVER...COLD
TEMPERATURES ALOFT MAY STILL RESULT IN AN ISOLATED SEVERE HAIL
THREAT AS WELL AS A THREAT FOR DAMAGING WIND GUSTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS EVENING.

ARZ073-LAZ005-006-013-014-019>022-111200-
UNION AR-LINCOLN-UNION LA-JACKSON-OUACHITA-WINN-GRANT-CALDWELL-
LA SALLE-
615 PM CDT WED APR 10 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS AND NORTH CENTRAL LOUISIANA.

.DAY ONE...TONIGHT...

...A TORNADO WATCH IS IN EFFECT FOR SOUTH CENTRAL ARKANSAS AND NORTH
CENTRAL LOUISIANA UNTIL 1 AM CDT THURSDAY MORNING...

SCATTERED THUNDERSTORMS ARE DEVELOPING AHEAD OF COLD FRONT THAT IS
SLOWLY MOVING ACROSS THE REGION. VERTICAL WIND SHEAR AND
INSTABILITY IS MORE THAN SUFFICIENT TO SUPPORT THE DEVELOPMENT OF
SUPERCELLS...INCLUDING A THREAT FOR LARGE HAIL...DAMAGING
WINDS...AND ISOLATED TORNADOES.

THE SEVERE WEATHER THREAT IS EXPECTED TO DIMINISH LATE TONIGHT AND
EARLY TUESDAY MORNING AS THE FRONT PASSES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED THIS EVENING AND TONIGHT.

LAZ001>004-010>012-017-018-OKZ077-TXZ096-097-108>112-124>126-
136>138-149>153-165>167-111200-
CADDO-BOSSIER-WEBSTER-CLAIBORNE-DE SOTO-RED RIVER-BIENVILLE-
SABINE LA-NATCHITOCHES-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-
CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-
NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX-
615 PM CDT WED APR 10 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST
LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND NORTHEAST TEXAS.

.DAY ONE...TONIGHT...

SCATTERED ELEVATED THUNDERSTORMS WILL CONTINUE FOR MUCH OF THIS
EVENING ACROSS PORTIONS OF EAST TEXAS AND WESTERN LOUISIANA. THESE
THUNDERSTORMS ARE IN A COLD AIRMASS BEHIND A COLD FRONT. DUE TO
THE COLD TEMPERATURES ALOFT...ONE OR TWO SEVERE HAIL REPORTS
CANNOT BE COMPLETELY RULED OUT. IN ADDITION...A THREAT FOR
ISOLATED DAMAGING WIND GUSTS WILL ALSO PERSIST THROUGH THE
EVENING.

THE THREAT FOR HAIL AND DAMAGING WINDS WILL GRADUALLY DIMINISH
FROM WEST TO EAST THIS EVENING.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS EVENING...MAINLY ACROSS
WESTERN LOUISIANA.

09

In the hours before

Special weather statement, Apr 10, 4:18 PM CDT, 2 hours 13 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Apr 10, 4:29 PM CDT, 2 hours 2 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Apr 10, 4:52 PM CDT, 1 hour 39 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Special weather statement, Apr 10, 5:30 PM CDT, 1 hour 1 minute before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
530 PM CDT WED APR 10 2013

ARZ072-073-102300-
COLUMBIA-UNION-
530 PM CDT WED APR 10 2013

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 600 PM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     COLUMBIA...
IN SOUTH CENTRAL ARKANSAS...
     UNION...

INCLUDING THE FOLLOWING LOCATIONS...
     MOUNT HOLLY...

AT 528 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR MOUNT HOLLY...OR 10 MILES
SOUTHEAST OF STEPHENS...MOVING NORTHEAST AT 45 MPH.

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

20

Special weather statement, Apr 10, 5:54 PM CDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
554 PM CDT WED APR 10 2013

ARZ071-072-LAZ002-003-110000-
BOSSIER-COLUMBIA-LAFAYETTE-WEBSTER-
554 PM CDT WED APR 10 2013

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 700 PM CDT...FOR THE FOLLOWING
COUNTIES AND PARISHES...

IN SOUTHWEST ARKANSAS...
     COLUMBIA AND LAFAYETTE...
IN NORTHWEST LOUISIANA...
     BOSSIER AND WEBSTER...

INCLUDING THE FOLLOWING LOCATIONS...
     BUSSEY...EMERSON...MACEDONIA...MAGNOLIA...MCNEIL...SMITHLAND...
     TAYLOR...VILLAGE...WALDO...WELCOME...COTTON VALLEY...CULLEN...
     SAREPTA...SHONGALOO AND SPRINGHILL...

AT 550 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM 7 MILES EAST OF BENTON...OR 12 MILES
NORTH OF BOSSIER CITY...MOVING NORTHEAST AT 50 MPH.

MOTHBALL SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM. ALSO...VERY HEAVY RAINFALL CAN BE EXPECTED.

20

Special weather statement, Apr 10, 6:14 PM CDT, 17 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
614 PM CDT WED APR 10 2013

ARZ071>073-LAZ002-003-110015-
BOSSIER-COLUMBIA-LAFAYETTE-UNION-WEBSTER-
614 PM CDT WED APR 10 2013

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 715 PM CDT...FOR THE FOLLOWING
COUNTIES AND PARISHES...

IN SOUTHWEST ARKANSAS...
     COLUMBIA AND LAFAYETTE...
IN SOUTH CENTRAL ARKANSAS...
     UNION...
IN NORTHWEST LOUISIANA...
     BOSSIER AND WEBSTER...

INCLUDING THE FOLLOWING LOCATIONS...
     BUCKNER...BUSSEY...EMERSON...MACEDONIA...MAGNOLIA...MCNEIL...
     MOUNT HOLLY...SMITHLAND...TAYLOR...VILLAGE...WALDO...WELCOME...
     CULLEN...SAREPTA...SHONGALOO AND SPRINGHILL...

AT 614 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR CULLEN...OR NEAR SPRINGHILL...
MOVING NORTHEAST AT 50 MPH.

NICKEL SIZE HAIL...AND WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS
STORM. ALSO...VERY HEAVY RAINFALL WILL BE LIKELY.

20

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 10, 1:59 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	61 min
Apr 10, 3:23 PM CDT	Severe Thunderstorm Warning	SHV	Cass, Marion	52 min
Apr 10, 6:52 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	53 min
Apr 10, 5:26 PM CDT	Areal Flood Advisory	SHV	Bossier, Caddo, De Soto	2 hr
Apr 10, 6:04 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	41 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2013 Every severe thunderstorm warning in 2013

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.