Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 240, NWS Shreveport, LA

November 17, 20155 parishes in Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Nov 17, 2015, 12:42 PM CST for 5 parishes in 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: Nov 17, 2015, 12:42 PM CST (18:42 UTC)
Expired: Nov 17, 2015, 1:45 PM CST
In force: 63 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The Shreveport radar (KSHV), 109 km from the middle of the area, began a volume at 18:44 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
Nov 17, 8:55 AM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 6.7 hours before the alert went out and 100 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: 559 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 703 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 264 m²/s²
0-3 km storm-relative helicity: 404 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 4.0

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 Nov 17, 12:22 PM CST, 20 minutes earlier.

Area forecast discussion, Nov 17, 12:22 PM CST, 20 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
1222 PM CST TUE NOV 17 2015

.AVIATION...
LEADING EDGE OF INTENSE CONVECTION...ALONG A PREFRONTAL TROUGH...
BEGINNING TO CREATE BOW SEGMENTS AS IT MOVES EAST OF I-49
CORRIDOR AND INTO WARMER AIR. ONSET OF TSTMS IN KMLU BY AROUND
20-21Z MAY BE ACCOMPANIED BY 40 TO 60 KT WIND GUSTS...IN ADDITION
TO POSSIBLE INCREASED TORNADIC POTENTIAL WITH STORMS. WIND GUSTS
WITH LEADING EDGE OF STORMS ARRIVING AT KELD 19-1930Z...WILL
LIKELY CONTAIN 40 TO NEAR 50 KTS WIND GUSTS. IN THE
MEANTIME...WINDS FROM THE SSE AT 15-20KT WITH GUSTS TO 30KTS WILL
PREVAIL MOST OF NORTH LA AND SW AR EAST OF I-30. POST TROUGH WINDS
AT KTXK...KLFK...AND KSHV NW 15 TO 20 KTS...DIMINISHING AND BECMG
SOUTHERLY AFTER RAINFALL DIMINISHES AFTER 21Z. MOSTLY MVFR CIGS
BUT VRBL DECKS IN RAIN BEFORE ENDING. SKIES BECMG VFR BY 18/00Z IN
NE TX...SPREADING EASTWARD WITH MID LVL DECKS. SKIES BECMG MOSTLY
VFR SKC AFTER 18/06Z. SW WINDS BTWN 5 TO 10 KTS TO PREVAIL AFTER
SKIES BECOME SKC./VII/.

&&

.PREV DISCUSSION... /ISSUED 931 AM CST TUE NOV 17 2015/

DISCUSSION...
QUICK UPDATE ISSUED FOR ALL PRODUCTS TO ACCOUNT FOR THE EXPIRATION
OF TOR WATCH 543 AT 15Z FOR SE OK AND PORTIONS OF E TX..AND THE
ISSUANCE OF NEW TOR WATCH 545 UNTIL 22Z ACROSS THE REMAINDER OF
THE CWA. ALL OTHER HEADLINES REMAIN VALID.

/09/

PREV DISCUSSION... /ISSUED 506 AM CST TUE NOV 17 2015/

UPDATE...
TO ADD TORNADO WATCH HEADLINE...MAINLY TEXAS ZONES AND SOME IN SW
ARKANSAS AND ONE IN SE OKLAHOMA.

DISCUSSION...
WCN FOR TORNADO WATCH 543 UNTIL 15Z/9AM HAS BEEN ISSUED. NO OTHER
CHANGES TO FORECAST AT THIS TIME. /24/

PREV DISCUSSION... /ISSUED 437 AM CST TUE NOV 17 2015/

DISCUSSION...
IT HAS BEEN A VERY WARM OVERNIGHT PERIOD WITH AIR TEMPERATURES
ABOVE WHERE HIGHS SHOULD BE MUCH LESS LOWS. CLOUDY SKIES WITH
GUSTY S/SW WINDS WITH GUSTS IN THE TEENS AND TWENTIES...EVEN
PEAKING NEAR 30 MPH IN A FEW SPOTS. RADAR MOSAICS HAVE BEEN
SHOWING A STEADY PROGRESSION OF THE MAIN SQUALL LINE AHEAD OF THE
COLD FRONT EDGING TOWARD TERRELL TEXAS NOW AND SHOULD BE INTO
TYLER FOR THE MORNING RUSH TO WORK AND SCHOOL. THIS LINE WILL
SPREAD EASTWARD AT 35 MPH AFFECTING THE ENTIRE FOUR STATE AREA BY
SUNSET. THE RAIN WILL COOL THE AIR A BIT...BUT THE COLD FRONT WILL
MAKE THE REAL DIFFERENCE ON TEMPS AND A LIGHT JACKET IS A GREAT
IDEA ESPECIALLY FOR THE SCHOOL KIDS. 70S WILL QUICKLY BECOME 50S
AND 60S BEHIND THE RAIN.

THE SEVERE THREAT FOR TODAY IS A SLIGHT RISK EVERYWHERE AND EVEN
ENHANCED FOR AREAS DURING THE AFTERNOON HEATING ALONG AND EAST OF
A LINE FROM MAGNOLIA ARKANSAS...TO NEAR SHREVEPORT AND BOSSIER
CITY...DOWN INTO TOLEDO BEND COUNTRY AT MANY. THE DAYTIME HEATING
WILL BRING TO BEAR THE MOST INSTABILITY TO THE SQUALL LINE WITH
BOWING SEGMENTS AND ISOLATED TORNADOES ALL POSSIBLE THROUGH THE
AFTERNOON ON EAST TO CROSSETT...MONROE AND ALEXANDRIA. LITTLE
CHANGE ON GOING LAKE WIND ADVISORY OR THE FLASH FLOOD WATCH FOR
TODAY. WE WILL LCL HAVE MANY UPDATES TODAY WITH A CONVECTIVE
WATCH LIKELIHOOD DEVELOPING RIGHT NOW DUE TO THE FAST SPEED OF
THE LINE AND GOING UP FOR AN AFTERNOON SET OF COUNTIES AND
PARISHES. KEEP ABREAST OF THE SITUATION TODAY WITH NOAA WX
RADIO/COMMERCIAL RADIO AND TV OUTLETS AND SOCIAL MEDIA. /24/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  76  47  67  45 / 100  40  10   0
MLU  76  49  68  44 / 100 100  10   0
DEQ  71  41  64  39 / 100  10   0   0
TXK  73  45  65  45 / 100  20   0   0
ELD  73  44  64  41 / 100  90  10   0
TYR  68  46  67  46 / 100  10  10   0
GGG  73  45  69  45 / 100  10  10   0
LFK  74  47  70  45 / 100  30  10   0

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...LAKE WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR ARZ050-051-
     059>061-070>073.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR ARZ050-051-059>061-
     070>073.

LA...LAKE WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR LAZ001>006-
     010>014-017>022.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR LAZ001>006-010>014-
     017>022.

OK...LAKE WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR OKZ077.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR OKZ077.

TX...LAKE WIND ADVISORY UNTIL 6 PM CST THIS EVENING FOR TXZ096-097-
     108>112-124>126-136>138-149>153-165>167.

     FLASH FLOOD WATCH THROUGH THIS EVENING FOR TXZ096-097-108>112-
     124>126-136>138-149>153-165>167.

&&

Hazardous weather outlook, Nov 17, 9:18 AM CST, 3 hours 24 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
918 AM CST TUE NOV 17 2015

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-TXZ097-112-
126-138-150>153-165>167-181200-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-DE SOTO-
RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE-NATCHITOCHES-WINN-
GRANT-CALDWELL-LA SALLE-BOWIE-CASS-MARION-HARRISON-RUSK-PANOLA-
NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-
918 AM CST TUE NOV 17 2015

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

.DAY ONE...TODAY AND TONIGHT...

A TORNADO WATCH IS IN EFFECT FOR SOUTHWEST AND SOUTHERN
ARKANSAS...NORTHWEST AND NORTH CENTRAL LOUISIANA...AND PORTIONS OF
EAST TEXAS UNTIL 4 PM CST THIS AFTERNOON.

A FLASH FLOOD WATCH IS IN EFFECT FOR THE ENTIRE FOUR STATE REGION
UNTIL MIDNIGHT TONIGHT.

A LINE OF STRONG TO SEVERE THUNDERSTORMS WILL MOVE ACROSS THE
REGION TODAY THROUGH TONIGHT. ADDITIONAL THUNDERSTORMS MAY DEVELOP
AHEAD OF THE MAIN LINE. THESE STORMS WOULD POSE AN ENHANCED THREAT
FOR SEVERE WEATHER...ESPECIALLY ACROSS SOUTHERN ARKANSAS AND NORTH
CENTRAL LOUISIANA. ANY STORMS THAT BECOME SEVERE COULD PRODUCE
DAMAGING WINDS...LARGE HAIL...AND ISOLATED TORNADOES. IN
ADDITION...TWO TO FOUR INCHES OF RAINFALL ARE POSSIBLE WHICH COULD
PRODUCE FLASH FLOODING.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED TODAY THROUGH THIS EVENING.

OKZ077-TXZ096-108>111-124-125-136-137-149-181200-
MCCURTAIN-RED RIVER-FRANKLIN-TITUS-CAMP-MORRIS-WOOD-UPSHUR-SMITH-
GREGG-CHEROKEE-
918 AM CST TUE NOV 17 2015

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

.DAY ONE...TODAY AND TONIGHT...

A FLASH FLOOD WATCH IS IN EFFECT FOR THE ENTIRE AREA UNTIL
MIDNIGHT TONIGHT.

A LINE OF STRONG THUNDERSTORMS WILL MOVE ACROSS THE AREA AHEAD OF
A COLD FRONT TODAY AND INTO THIS EVENING. HEAVY RAINFALL FROM
THESE THUNDERSTORMS COULD PRODUCE TWO TO FOUR INCHES OF RAINFALL
ACROSS THE AREA WHICH MAY LEAD TO FLASH FLOODING. A FEW STORMS
COULD ALSO BECOME SEVERE WITH DAMAGING WINDS...LARGE HAIL...AND
ISOLATED TORNADOES BEING POSSIBLE.

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

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED TODAY THROUGH THIS EVENING.

09

In the hours before

Local storm report, Nov 17, 12:07 PM CST, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1207 PM CST TUE NOV 17 2015

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

1047 AM     TSTM WND DMG     PATMOS                  33.51N  93.57W
11/17/2015                   HEMPSTEAD          AR   LAW ENFORCEMENT

            SHERIFF REPORTS SEVERAL TREES DOWN ACROSS PATMOS.

&&

EVENT NUMBER SHV1500708

20

Local storm report, Nov 17, 12:10 PM CST, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1210 PM CST TUE NOV 17 2015

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

1050 AM     TSTM WND DMG     HOPE                    33.67N  93.59W
11/17/2015                   HEMPSTEAD          AR   LAW ENFORCEMENT

            SHERIFF REPORTS TREES DOWN ALONG I-30 NEAR HOPE.

&&

EVENT NUMBER SHV1500709

20

Local storm report, Nov 17, 12:12 PM CST, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1212 PM CST TUE NOV 17 2015

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

0930 AM     TSTM WND DMG     REDWATER                33.36N  94.25W
11/17/2015                   BOWIE              TX   PUBLIC

            TREES AND POWERLINES DOWN ALONG FM ROAD 3098.

&&

EVENT NUMBER SHV1500710

20

Local storm report, Nov 17, 12:16 PM CST, 26 minutes before

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Local storm report, Nov 17, 12:19 PM CST, 23 minutes before

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Local storm report, Nov 17, 12:23 PM CST, 19 minutes before

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    <section class="card" role="status" aria-live="polite">
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 17, 6:17 AM CST	Special Weather Statement	SHV	Franklin, Red River, Titus	43 min
Nov 17, 6:26 AM CST	Special Weather Statement	SHV	Smith, Wood	64 min
Nov 17, 7:00 AM CST	Special Weather Statement	SHV	Franklin, Morris, Red River, Titus	60 min
Nov 17, 7:25 AM CST	Special Weather Statement	SHV	Harrison, Panola	65 min
Nov 17, 8:51 AM CST	Special Weather Statement	SHV	Sabine	39 min
Nov 17, 8:56 AM CST	Special Weather Statement	SHV	Nacogdoches	49 min
Nov 17, 9:01 AM CST	Areal Flood Advisory	SHV	Rusk	119 min
Nov 17, 9:06 AM CST	Special Weather Statement	SHV	Bowie	39 min
Nov 17, 9:13 AM CST	Areal Flood Advisory	SHV	Angelina, Cherokee, Nacogdoches	2 hr
Nov 17, 9:20 AM CST	Special Weather Statement	SHV	Cass, Harrison, Marion	40 min
Nov 17, 9:48 AM CST	River Flood Warning	SHV	Angelina, Houston, Polk, Trinity, Tyler	13 days
Nov 17, 9:52 AM CST	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	7 days
Nov 17, 9:52 AM CST	River Flood Warning	SHV	Bowie, Cass, Morris	9 days
Nov 17, 9:55 AM CST	River Flood Warning	SHV	Franklin, Morris, Titus	5 days
Nov 17, 9:56 AM CST	River Flood Warning	SHV	Gregg	51 hr
Nov 17, 9:58 AM CST	River Flood Warning	SHV	Nacogdoches, Rusk	5 days
Nov 17, 10:39 AM CST	Areal Flood Warning	SHV	Cass, Harrison, Marion, Nacogdoches, Panola, San Augustine and 1 more	2 hr
Nov 17, 11:52 AM CST	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	7 days
Nov 17, 1:53 PM CST	Flash Flood Warning	SHV	Angelina, Cherokee, Nacogdoches, Rusk, San Augustine, Shelby	3 hr
Nov 17, 3:54 PM CST	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	9 days
Nov 17, 8:26 AM CST	Special Weather Statement	SHV	Caddo	49 min
Nov 17, 9:54 AM CST	Special Weather Statement	SHV	Caddo	66 min
Nov 17, 10:21 AM CST	Special Weather Statement	SHV	Caddo	39 min
Nov 17, 11:00 AM CST	Special Weather Statement	SHV	Bossier, Caddo, De Soto, Red River, Webster	45 min
Nov 17, 11:43 AM CST	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Union, Webster	62 min
Nov 17, 11:45 AM CST	Special Weather Statement	SHV	De Soto	45 min
Nov 17, 12:14 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, De Soto, Natchitoches, Red River, Sabine	61 min
Nov 17, 1:09 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Sabine, Winn	51 min
Nov 17, 1:58 PM CST	Severe Thunderstorm Warning	SHV	Jackson, Lincoln, Union	48 min
Nov 17, 8:44 AM CST	Special Weather Statement	SHV	Lafayette	46 min
Nov 17, 10:42 AM CST	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Nevada	63 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Severe Thunderstorm Warnings in Arkansas, 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.