Alert archive / Louisiana / Severe Thunderstorm Warnings in 2006

Severe Thunderstorm Warning 55, NWS Shreveport, LA

April 7, 2006Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 7, 2006, 3:12 PM CDT for Union Parish, Louisiana. 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 7, 2006, 3:12 PM CDT (20:12 UTC)
Expired: Apr 7, 2006, 4:15 PM CDT
In force: 63 min
Issued by: NWS Shreveport, LA
Area: Counties, with a storm outline in the text

County Union Parish, LA

The radar

The Shreveport radar (KSHV), 144 km from the middle of the area, began a volume at 20:15 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 7, 11:34 AM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 8.2 hours before the alert went out and 222 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: 883 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 651 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 282 m²/s²
0-3 km storm-relative helicity: 315 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.6

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 7, 12:10 PM CDT, 3 hours 2 minutes earlier.

Area forecast discussion, Apr 7, 12:10 PM CDT, 3 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>

Hazardous weather outlook, Apr 7, 12:16 PM CDT, 2 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1216 PM CDT FRI APR 7 2006

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-081200-
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-
1216 PM CDT FRI APR 7 2006

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...
THERE IS A RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT...
GENERALLY SOUTH AND EAST OF THE INTERSTATE 30 CORRIDOR.  A MODERATE
RISK OF SEVERE THUNDERSTORMS EXISTS GENERALLY EAST OF A LINE FROM
NATCHITOCHES LOUISIANA TO EL DORADO ARKANSAS.

HAIL GREATER THAN THREE QUARTERS OF AN INCH AND ISOLATED TORNADOES
ARE THE MAIN SEVERE WEATHER RISKS.  HOWEVER...DAMAGING WINDS IN
EXCESS OF 60 MILES AN HOUR WILL ALSO BE POSSIBLE.

A COLD FRONT HAS MOVED TOWARD THE INTERSTATE 30 CORRIDOR EARLY THIS
AFTERNOON. A POWERFUL DISTURBANCE...IN THE UPPER LEVELS OF THE
ATMOSPHERE...WILL SWEEP ACROSS THE RED RIVER VALLEY AND INTO THE
FOUR STATE REGION AND RESULT IN THUNDERSTORM DEVELOPMENT. THE
COMBINATION OF STRONG JET STREAM DYNAMICS...A COLD FRONT...AND A VERY
WARM...MOIST...AND UNSTABLE AIRMASS...WILL ALLOW SOME OF THE
THUNDERSTORMS TO BECOME SEVERE.  THE RISK OF SEVERE WEATHER IS
GREATER FROM SOUTH CENTRAL ARKANSAS INTO CENTRAL LOUISIANA...WHERE
SLIGHTLY HIGHER AMOUNTS OF MOISTURE ARE PRESENT.

THE RISK OF SEVERE THUNDERSTORMS IS EXPECTED TO END TONIGHT...AS A
SECONDARY COLD FRONT SWINGS THROUGH THE FOUR STATE REGION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY...
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...
ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND STORM
SPOTTERS...MAY BE NEEDED THIS AFTERNOON AND TONIGHT.

BUTTS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 3:59 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	15 hr
Apr 7, 3:04 PM CDT	Severe Thunderstorm Warning	SHV	Lincoln	26 min
Apr 7, 3:51 PM CDT	Severe Thunderstorm Warning	SHV	Ouachita	39 min
Apr 7, 5:08 PM CDT	Severe Thunderstorm Warning	SHV	Ouachita	67 min
Apr 7, 5:22 PM CDT	Severe Thunderstorm Warning	SHV	Lincoln	23 min
Apr 7, 5:24 PM CDT	Severe Thunderstorm Warning	SHV	Union	66 min
Apr 7, 5:40 PM CDT	Severe Thunderstorm Warning	SHV	Jackson	65 min
Apr 7, 6:02 PM CDT	Severe Thunderstorm Warning	SHV	Webster	43 min
Apr 7, 6:21 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne	39 min
Apr 7, 6:41 PM CDT	Severe Thunderstorm Warning	SHV	Union	79 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2006 Every severe thunderstorm warning in 2006

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.