Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 172, NWS Shreveport, LA

May 27, 2015Natchitoches Parish, Sabine Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at May 27, 2015, 5:45 AM CDT for Natchitoches Parish, Sabine Parish, Louisiana. It was in force for 45 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 27, 2015, 5:45 AM CDT (10:45 UTC)
Expired: May 27, 2015, 6:30 AM CDT
In force: 45 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Natchitoches Parish, LA, Sabine Parish, LA

The radar

The Ft Polk radar (KPOE), 64 km from the middle of the area, began a volume at 10:49 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 nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 10.8 hours before the alert went out and 101 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: 2156 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 32 m²/s²
Significant tornado parameter: 0.3
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 May 27, 5:00 AM CDT, 45 minutes earlier.

Area forecast discussion, May 27, 5:00 AM CDT, 45 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, May 26, 12:50 PM CDT, 16 hours 55 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1250 PM CDT TUE MAY 26 2015

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-271100-
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-
1250 PM CDT TUE MAY 26 2015

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

SCATTERED SHOWERS AND THUNDERSTORMS WILL REMAIN POSSIBLE TODAY
FROM THE LOWER TOLEDO BEND COUNTRY OF DEEP EAST TEXAS INTO THE
SOUTHERN SECTIONS OF NORTHCENTRAL LOUISIANA. BRIEF HEAVY RAINFALL
WILL BE POSSIBLE BEFORE ANY REDEVELOPMENT DIMINISHES THIS EVENING.
ADDITIONAL SCATTERED SHOWERS AND THUNDERSTORMS MAY ALSO DEVELOP
ALONG THE MIDDLE RED RIVER VALLEY THIS EVENING...AND SPREAD EAST
INTO EXTREME NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...AND POSSIBLY
SOUTHWEST ARKANSAS LATE. BRIEF HEAVY RAINFALL WILL BE POSSIBLE
SHOULD THESE STORMS AFFECT THESE AREAS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY...

SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY
AND THURSDAY...AS A SERIES OF UPPER LEVEL DISTURBANCES MOVE
THROUGH THE REGION. SHOWERS AND THUNDERSTORMS MAY INCREASE IN
COVERAGE FRIDAY THROUGH MONDAY AS AN UPPER LEVEL TROUGH OF LOW
PRESSURE DRIFTS EAST INTO THE SOUTHERN PLAINS AND FOUR STATE
REGION. DAYTIME HEATING WILL PRODUCE ENOUGH INSTABILITY SUCH
THAT ISOLATED STRONG STORMS WILL BE CAPABLE OF PRODUCING
LOCALLY GUSTY WINDS AND BRIEF HEAVY RAINFALL.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH
TONIGHT.

06

In the hours before

Special weather statement, May 27, 2:42 AM CDT, 3 hours 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
242 AM CDT WED MAY 27 2015

LAZ001-002-010-011-TXZ138-151-270830-
RED RIVER LA-DE SOTO LA-BOSSIER LA-CADDO LA-HARRISON TX-PANOLA TX-
242 AM CDT WED MAY 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN BOSSIER...SOUTHERN
CADDO...NORTHWESTERN RED RIVER AND NORTHWESTERN DE SOTO PARISHES...
SOUTHEASTERN HARRISON AND NORTHEASTERN PANOLA COUNTIES UNTIL 330 AM
CDT...

AT 242 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
ELYSIAN FIELDS...OR 14 MILES SOUTHEAST OF MARSHALL...MOVING EAST AT
40 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
SHREVEPORT...BOSSIER CITY...MARSHALL...GREENWOOD...BLANCHARD...
WASKOM...STONEWALL...ELYSIAN FIELDS...FOSTERS...EASTWOOD...DEBERRY...
SCOTTSVILLE...KEACHI...BETHANY...ROBSON...FERGUSON...TAYLORTOWN...
KICKAPOO...RED CHUTE AND FORBING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3260 9430 3265 9354 3218 9353 3218 9431
TIME...MOT...LOC 0742Z 268DEG 33KT 3238 9417

05

Special weather statement, May 27, 3:19 AM CDT, 2 hours 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
319 AM CDT WED MAY 27 2015

LAZ017-TXZ152-153-165>167-270915-
SABINE LA-SAN AUGUSTINE TX-SABINE TX-ANGELINA TX-NACOGDOCHES TX-
SHELBY TX-
319 AM CDT WED MAY 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN SABINE PARISH...
SOUTHEASTERN NACOGDOCHES...SHELBY...ANGELINA...NORTHWESTERN SABINE
AND SAN AUGUSTINE COUNTIES UNTIL 415 AM CDT...

AT 318 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR CENTER TO NEAR
DIBOLL...AND MOVING SOUTHEAST AT 30 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
LUFKIN...CENTER...DIBOLL...HUDSON...HUNTINGTON...SAN AUGUSTINE...
NEUVILLE...ETOILE...SHELBYVILLE...BLAND LAKE...ROSEVINE...WODEN...
MACUNE...MARTINSVILLE...PATROON...MELROSE...BURKE...ZAVALLA...CHIRENO
AND HUXLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3115 9485 3123 9486 3126 9490 3130 9489
      3194 9417 3170 9367 3106 9435 3103 9447
TIME...MOT...LOC 0818Z 314DEG 26KT 3174 9420 3125 9484

24

Special weather statement, May 27, 3:31 AM CDT, 2 hours 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
331 AM CDT WED MAY 27 2015

LAZ001>004-010>012-017-TXZ151-153-270915-
RED RIVER LA-DE SOTO LA-SABINE LA-CLAIBORNE LA-BOSSIER LA-WEBSTER LA-
BIENVILLE LA-CADDO LA-SHELBY TX-PANOLA TX-
331 AM CDT WED MAY 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CLAIBORNE...SOUTHERN
BOSSIER...SOUTHERN CADDO...NORTHWESTERN BIENVILLE...NORTHWESTERN RED
RIVER...SOUTHERN WEBSTER...NORTHWESTERN SABINE AND DE SOTO
PARISHES...NORTHEASTERN SHELBY AND SOUTHEASTERN PANOLA COUNTIES UNTIL
415 AM CDT...

AT 331 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR FOSTERS TO NEAR
CENTER...AND MOVING EAST AT 35 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
SHREVEPORT...BOSSIER CITY...MINDEN...CENTER...MANSFIELD...HOMER...
HAUGHTON...STONEWALL...LOGANSPORT...RINGGOLD...SIBLEY...JOAQUIN...
DOYLINE...CONVERSE...DUBBERLY...DIXIE INN...HEFLIN...FOSTERS...
SHELBYVILLE AND EASTWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3282 9302 3161 9368 3179 9431 3263 9375
TIME...MOT...LOC 0831Z 257DEG 32KT 3257 9372 3181 9414

24

Special weather statement, May 27, 4:04 AM CDT, 1 hour 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
404 AM CDT WED MAY 27 2015

LAZ017-TXZ153-165>167-270945-
SABINE LA-SAN AUGUSTINE TX-SABINE TX-ANGELINA TX-SHELBY TX-
404 AM CDT WED MAY 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN SABINE PARISH...
SOUTHEASTERN SHELBY...SOUTHEASTERN ANGELINA...SABINE AND SAN
AUGUSTINE COUNTIES UNTIL 445 AM CDT...

AT 403 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR NEUVILLE TO NEAR
CHESTER...AND MOVING SOUTHEAST AT 25 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MILAM...SAN AUGUSTINE...ZWOLLE...HEMPHILL...PINELAND...ROSEVINE...
MACUNE...PATROON...SHELBYVILLE...BLAND LAKE...ZAVALLA...BROADDUS...
DOLAN...CALGARY...SEXTON...TOLEDO BEND RESERVOIR NORTH...HURSTOWN...
CHINAQUAPIN...COLUMBUS AND YELLOWPINE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3103 9448 3105 9449 3126 9437 3126 9436
      3122 9433 3123 9432 3127 9434 3130 9431
      3135 9432 3176 9409 3165 9364 3119 9357
      3117 9358 3116 9391 3114 9404 3111 9406
TIME...MOT...LOC 0903Z 310DEG 24KT 3168 9409 3091 9452

24

Special weather statement, May 27, 4:15 AM CDT, 1 hour 30 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
415 AM CDT WED MAY 27 2015

LAZ001>005-010>012-017-018-271000-
RED RIVER LA-DE SOTO LA-SABINE LA-NATCHITOCHES LA-CLAIBORNE LA-
LINCOLN LA-BOSSIER LA-WEBSTER LA-BIENVILLE LA-CADDO LA-
415 AM CDT WED MAY 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN CLAIBORNE...
SOUTHEASTERN BOSSIER...SOUTHEASTERN CADDO...BIENVILLE...RED RIVER...
SOUTHERN WEBSTER...NORTHERN SABINE...WEST CENTRAL LINCOLN...EASTERN
DE SOTO AND NORTHWESTERN NATCHITOCHES PARISHES UNTIL 500 AM CDT...

AT 414 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM 7 MILES NORTHWEST OF MINDEN
TO CONVERSE...AND MOVING EAST AT 25 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MINDEN...MANSFIELD...HAUGHTON...ARCADIA...MANY...COUSHATTA...
RINGGOLD...SIBLEY...GIBSLAND...DOYLINE...CONVERSE...DUBBERLY...DIXIE
INN...HEFLIN...ALLEN...OAK GROVE...PLEASANT HILL...MARTIN...HALL
SUMMIT AND LUCKY.

THE GUST FRONT IS OUT AHEAD OF THESE STORMS...BUT INTENSIFICATION IS
POSSIBLE...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS
WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND
POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3269 9282 3152 9330 3175 9381 3279 9340
TIME...MOT...LOC 0914Z 288DEG 23KT 3270 9336 3180 9372

24

Special weather statement, May 27, 4:59 AM CDT, 46 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>

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 8:08 PM CDT	Severe Thunderstorm Warning	SHV	Harrison	37 min
May 26, 9:32 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	58 min
May 26, 9:58 PM CDT	Flash Flood Warning	SHV	Smith, Wood	3 hr
May 26, 10:02 PM CDT	Severe Thunderstorm Warning	SHV	Upshur	58 min
May 26, 11:04 PM CDT	Flash Flood Warning	SHV	Upshur	3 hr
May 27, 12:23 AM CDT	Special Weather Statement	SHV	Smith	52 min
May 27, 1:23 AM CDT	Special Weather Statement	SHV	Gregg, Harrison, Rusk	52 min
May 27, 3:19 AM CDT	Special Weather Statement	SHV	Angelina, San Augustine, Shelby	56 min
May 27, 3:31 AM CDT	Special Weather Statement	SHV	Shelby	44 min
May 27, 4:04 AM CDT	Special Weather Statement	SHV	Sabine, San Augustine	41 min
May 27, 4:37 AM CDT	Severe Thunderstorm Warning	SHV	Sabine, San Augustine	53 min
May 27, 11:45 AM CDT	River Flood Warning	SHV	Cherokee, Nacogdoches, Rusk, Smith	3 days
May 27, 1:12 PM CDT	Special Weather Statement	SHV	Nacogdoches	48 min
May 27, 1:31 PM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches	119 min
May 26, 7:24 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	51 min
May 26, 7:52 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	38 min
May 26, 8:19 PM CDT	Severe Thunderstorm Warning	SHV	Bossier	41 min
May 26, 9:16 PM CDT	Flash Flood Warning	SHV	Union	3 hr
May 26, 9:22 PM CDT	Severe Thunderstorm Warning	SHV	Union	53 min
May 27, 2:42 AM CDT	Special Weather Statement	SHV	Caddo	48 min
May 27, 4:15 AM CDT	Special Weather Statement	SHV	Bienville, Red River, Webster	45 min
May 27, 4:59 AM CDT	Special Weather Statement	SHV	Bienville, Lincoln, Natchitoches, Red River, Sabine	61 min
May 27, 5:25 AM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Sabine, Winn	65 min
May 27, 6:31 AM CDT	Special Weather Statement	SHV	Grant	44 min
May 27, 7:12 AM CDT	Special Weather Statement	SHV	LaSalle	63 min
May 27, 8:48 AM CDT	Areal Flood Advisory	SHV	Caldwell	117 min
May 26, 9:55 PM CDT	Severe Thunderstorm Warning	SHV	Union	65 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Every severe thunderstorm warning in 2015

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.