Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 309, NWS Shreveport, LA

May 10, 2008Claiborne Parish, Lincoln Parish, Union Parish, Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at May 10, 2008, 10:57 PM CDT for Claiborne Parish, Lincoln Parish, Union Parish, Louisiana; Union 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: May 10, 2008, 10:57 PM CDT (03:57 UTC)
Expired: May 11, 2008, 12:00 AM CDT
In force: 63 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Union County, AR, Claiborne Parish, LA, Lincoln Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 120 km from the middle of the area, began a volume at 03:58 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
May 10, 10:07 PM CDT	Tornado Watch	SPC	5 hr
May 10, 6:51 PM CDT	Tornado Watch PDS	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.0 hours before the alert went out and 110 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: 2721 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 833 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 162 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 3.5
Supercell composite: 13.4

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 May 10, 10:52 PM CDT, 5 minutes earlier.

Area forecast discussion, May 10, 10:52 PM CDT, 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1052 PM CDT SAT MAY 10 2008

.DISCUSSION...

HAVE UPDATED THE ZONES AND GRIDS TO REFLECT THE CURRENT WATCHES...
HAVE DROPPED SOME ZONES SINCE SEVERE WEATHER MOVED EAST AND
SOUTHEAST. LOWERED THE CHANCE OF RAIN BEHIND THE ONGOING SHOWERS
AND THUNDERSTORMS AND HAVE UPDATED WINDS. ZONES ALREADY OUT. /06/

&&

.PREV DISCUSSION... /ISSUED 858 PM CDT SAT MAY 10 2008/

DISCUSSION...

WILL DO A QUICK UPDATE FOR THIS EVENING. TORNADO WATCH 295 WILL
HAVE TO BE EXTENDED UNTIL AROUND MIDNIGHT TO CLEAR HARRISON
COUNTY. WILL ADJUST TEMPS A LITTLE TO GO WITH CURRENT READINGS...
BUT FOR THE MOST PART FORECAST LOOKS OK. COLD FRONT IS JUST NOW
ENTERING MCCURTAIN COUNTY OKLAHOMA...MOVING SOUTHEAST AROUND 25
MPH. A NEW WATCH MAY HAVE TO BE ISSUED BEFORE MIDNIGHT FOR NORTH
LOUISIANA...MAINLY ALONG AND NORTH OF INTERSTATE 20.

AVIATION...

SCATTERED SVR TSTMS...JUST AHEAD OF STG COLD FRONT...MOVING SE NEAR
40 KTS. HAIL TO SIZE OF BASEBALLS REPORTED...AND STORMS CONTINUE
WITH STG ROTATION. STORMS BEARING DOWN ON TXK...MAY REACH
TYR...GGG...SHV...ELD SITES BY AROUND 04Z. AFTER FROPA...
NW WINDS GUSTING TO NEAR 20 KTS...AND CLEARING SKIES...CAN BE
EXPECTED./VII/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  61  77  52  84 /  70  10   0   0
MLU  60  76  50  80 /  60  10   0   0
DEQ  51  75  43  80 /  20  10   0   0
TXK  58  72  46  80 /  20  10   0   0
ELD  61  76  43  82 /  70  10   0   0
TYR  59  77  52  83 /  50   0   0   0
GGG  60  78  48  83 /  50   0   0   0
LFK  67  80  51  84 /  40   0   0   0

&&

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

06

Hazardous weather outlook, May 10, 12:00 PM CDT, 10 hours 57 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT SAT MAY 10 2008

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-111100-
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-
1200 PM CDT SAT MAY 10 2008

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...TODAY AND TONIGHT...

A COLD FRONT...ACCOMPANIED BY A DRY LINE...WILL MOVE INTO
SOUTHERN OKLAHOMA AND NORTH TEXAS THIS AFTERNOON. WITH A WARM...
MOIST AND UNSTABLE AIRMASS IN PLACE AHEAD OF THIS SYSTEM...AND THE
ADDITIONAL SUPPORT OF A VIGOROUS UPPER LEVEL TROUGH...THUNDERSTORMS
ARE EXPECTED TO DEVELOP. THERE IS A MODERATE RISK THAT STORMS WILL
BECOME SEVERE ACROSS THE FOUR STATE REGION...PRODUCING LARGE HAIL...
DAMAGING WINDS...AND ISOLATED TORNADOES. THE SEVERE WEATHER THREAT
IS EXPECTED TO CONTINUE THROUGHOUT THE EVENING HOURS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

SEVERE THUNDERSTORMS WILL BE POSSIBLE NEAR THE MIDDLE OF
NEXT WEEK AS A COLD FRONT MOVES THROUGH THE FOUR STATE
REGION.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER...HAM RADIO OPERATOR...AND EMERGENCY MANAGEMENT
PERSONNEL ACTIVATION WILL BE NEEDED TODAY AND OVERNIGHT.

In the hours before

Local storm report, May 10, 10:35 PM CDT, 22 minutes before

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Local storm report, May 10, 10:36 PM CDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1036 PM CDT SAT MAY 10 2008

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

1010 PM     HAIL             WILLISVILLE             33.52N 93.29W
05/10/2008  E0.88 INCH       NEVADA             AR   AMATEUR RADIO

&&

MBERRY

Local storm report, May 10, 10:45 PM CDT, 12 minutes before

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<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.
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Local storm report, May 10, 10:46 PM CDT, 11 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1046 PM CDT SAT MAY 10 2008

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

1030 PM     HAIL             CALION                  33.33N 92.54W
05/10/2008  E1.00 INCH       UNION              AR   LAW ENFORCEMENT

&&

MBERRY

Local storm report, May 10, 10:48 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1048 PM CDT SAT MAY 10 2008

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

1030 PM     TSTM WND DMG     CALION                  33.33N 92.54W
05/10/2008                   UNION              AR   LAW ENFORCEMENT

            POWER LINES DOWNED IN TOWN.

&&

MBERRY

Special weather statement, May 10, 10:51 PM CDT, 6 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1051 PM CDT SAT MAY 10 2008

ARZ072-LAZ002>004-012-110445-
BIENVILLE-BOSSIER-CLAIBORNE-COLUMBIA-WEBSTER-
1051 PM CDT SAT MAY 10 2008

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SPECIAL
WEATHER STATEMENT EFFECTIVE UNTIL 1145 PM CDT FOR THE FOLLOWING
COUNTIES AND PARISHES
IN SOUTHWEST ARKANSAS
     COLUMBIA

IN NORTHWEST LOUISIANA
     BOSSIER...WEBSTER...CLAIBORNE AND BIENVILLE

INCLUDING THE FOLLOWING LOCATIONS
     ATLANTA...EMERSON...ARCADIA...COTTON VALLEY...CULLEN...
     GIBSLAND...HAYNESVILLE...HOMER...MINDEN...SAREPTA...SIBLEY AND
     SPRINGHILL

AT 1051 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 5 MILES NORTHEAST OF
ATLANTA TO 5 MILES WEST OF CULLEN...OR ALONG A LINE EXTENDING FROM 16
MILES WEST OF JUNCTION CITY TO 6 MILES SOUTHWEST OF SPRINGHILL...
MOVING SOUTHEAST AT 48 MPH.

SMALL HAIL...AND WINDS AROUND 40 TO 45 MPH ARE EXPECTED WITH THESE
STORMS.

SHOULD THESE STORMS INTENSIFY...A SEVERE THUNDERSTORM WARNING MAY BE
NEEDED FOR THESE AREAS.

LAT...LON 3315 9297 3302 9297 3302 9271 3277 9272
      3276 9283 3246 9289 3245 9320 3294 9372
TIME...MOT...LOC 0351Z 287DEG 42KT 3310 9296 3294 9351

15

The office that day

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

Issued	Product	Office	Counties	Lasted
May 10, 8:30 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Morris, Red River, Titus	60 min
May 10, 9:19 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Franklin, Harrison, Marion, Morris and 3 more	56 min
May 10, 9:25 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	46 min
May 10, 9:52 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	53 min
May 10, 10:20 PM CDT	Special Weather Statement	SHV	Harrison, Panola	55 min
May 10, 10:32 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	43 min
May 10, 10:51 PM CDT	Special Weather Statement	SHV	Claiborne, Webster	54 min
May 10, 11:17 PM CDT	Special Weather Statement	SHV	De Soto, Red River	58 min
May 10, 11:41 PM CDT	Special Weather Statement	SHV	Bienville, Jackson, Ouachita	64 min
May 10, 7:46 PM CDT	Tornado Warning	SHV	Little River, Sevier	59 min
May 10, 8:37 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Nevada	53 min
May 10, 8:46 PM CDT	Tornado Warning	SHV	Hempstead, Howard, Little River, Miller, Sevier	44 min
May 10, 8:50 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	40 min
May 10, 8:56 PM CDT	Tornado Warning	SHV	Hempstead, Nevada	49 min
May 10, 9:30 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	60 min
May 10, 9:55 PM CDT	Tornado Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	35 min
May 10, 10:00 PM CDT	Severe Thunderstorm Warning	SHV	Union	60 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2008 Severe Thunderstorm Warnings in Arkansas, 2008 Every severe thunderstorm warning in 2008

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.