Alert archive / Arkansas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 243, NWS Shreveport, LA

May 5, 1999Columbia County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at May 5, 1999, 2:57 PM CDT for Columbia County, Arkansas. It was in force for 48 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 5, 1999, 2:57 PM CDT (19:57 UTC)
Expired
May 5, 1999, 3:45 PM CDT
In force
48 min
Issued by
NWS Shreveport, LA
Area
Whole counties

County Columbia County, AR

The radar

The Shreveport radar (KSHV), 102 km from the middle of the area, began a volume at 20:01 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.

IssuedProductOfficeLasted
May 5, 2:00 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.0 hours before the alert went out and 95 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, Shreveport, LA at 12:00Z on 1999-05-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2215 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, Shreveport, LA at 12:00Z on 1999-05-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 208 square meters per square second.1939587897Sfc1 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
2215 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
208 m²/s²
0-3 km storm-relative helicity
255 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.7

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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 5, 2:45 PM CDT, 12 minutes earlier.

Area forecast discussion, May 5, 2:45 PM CDT, 12 minutes before
FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
245 PM CDT WED MAY 5 1999

ZIPPY SEVERE STORMS STARTING ALONG DRYLINE. FRONTAL BOUNDARY ALSO
SEEN ALONG RED RIVER OF NORTH TEXAS. DON/T THINK A SECOND ROUND IS
IN STORE ALONG FRONT...SO WILL FOCUS MAINLY ON DRYLINE. BEHIND
DRYLINE WILL KEEP A FEW LOW POPS BUT WON/T JUMP THROUGH HOOPS. DRY
FORECAST FOR THURSDAY THROUGH FRIDAY. DRYLINE CURRENTLY ON DOORSTEP
OF TXK/GGG. RAPIDLY DEVELOPING SQUALL LINE APPROACHING SHV.

WILL FINISH UP EXTENDED A LITTLE LATER...WILL ISSUE SHADOWS EARLY IN
ORDER TO JUMP BACK INTO THE SEVERE WEATHER FRYING PAN. GUIDANCE
TEMPS NOT TOO BAD.

SHV  57/80/54/80 5000   MLU  59/82/55/80 7000   TXK  53/76/50/77 2000
TYR  53/78/51/80 0000   LFK  56/82/54/82 5000

17

In the hours before

Special weather statement, May 5, 10:00 AM CDT, 4 hours 57 minutes before
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Special weather statement, May 5, 10:00 AM CDT, 4 hours 57 minutes before
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<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
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Special weather statement, May 5, 12:10 PM CDT, 2 hours 47 minutes before
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<head>
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  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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>
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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.

IssuedProductOfficeCountiesLasted
May 4, 7:08 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion47 min
May 4, 7:21 PM CDTTornado WarningSHVCherokee64 min
May 4, 7:35 PM CDTSevere Thunderstorm WarningSHVSmith65 min
May 4, 7:52 PM CDTSevere Thunderstorm WarningSHVGregg48 min
May 4, 8:11 PM CDTSevere Thunderstorm WarningSHVHarrison64 min
May 4, 8:28 PM CDTTornado WarningSHVNacogdoches62 min
May 4, 9:21 PM CDTSevere Thunderstorm WarningSHVShelby59 min
May 5, 2:15 PM CDTSevere Thunderstorm WarningSHVHarrison, Panola35 min
May 5, 2:17 PM CDTSevere Thunderstorm WarningSHVNacogdoches33 min
May 5, 2:50 PM CDTSevere Thunderstorm WarningSHVPanola, Shelby50 min
May 5, 3:40 PM CDTSevere Thunderstorm WarningSHVShelby50 min
May 4, 7:49 PM CDTSevere Thunderstorm WarningSHVCaddo31 min
May 4, 9:13 PM CDTSevere Thunderstorm WarningSHVWebster47 min
May 4, 10:15 PM CDTSevere Thunderstorm WarningSHVBienville65 min
May 4, 10:30 PM CDTTornado WarningSHVBienville50 min
May 4, 10:38 PM CDTTornado WarningSHVLincoln62 min
May 4, 11:51 PM CDTSevere Thunderstorm WarningSHVOuachita49 min
May 5, 4:14 AM CDTTornado WarningSHVClaiborne61 min
May 5, 6:29 AM CDTSevere Thunderstorm WarningSHVUnion56 min
May 5, 6:41 AM CDTTornado WarningSHVUnion49 min
May 5, 2:15 PM CDTSevere Thunderstorm WarningSHVBossier35 min
May 5, 2:50 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo50 min
May 5, 3:28 PM CDTSevere Thunderstorm WarningSHVWebster47 min
May 5, 3:40 PM CDTSevere Thunderstorm WarningSHVBossier, Caddo50 min
May 5, 4:18 PM CDTSevere Thunderstorm WarningSHVClaiborne47 min
May 5, 4:38 PM CDTSevere Thunderstorm WarningSHVBienville, Webster47 min
May 5, 5:32 PM CDTSevere Thunderstorm WarningSHVCaldwell, Winn48 min
May 5, 6:37 PM CDTSevere Thunderstorm WarningSHVOuachita48 min
May 4, 7:15 PM CDTTornado WarningSHVUnion30 min
May 5, 7:07 AM CDTTornado WarningSHVUnion63 min
May 5, 1:06 PM CDTSevere Thunderstorm WarningSHVUnion19 min
May 5, 2:35 PM CDTSevere Thunderstorm WarningSHVColumbia35 min
May 5, 2:47 PM CDTSevere Thunderstorm WarningSHVUnion33 min
May 5, 4:42 PM CDTSevere Thunderstorm WarningSHVUnion48 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 1999Every severe thunderstorm warning in 1999

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.