Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 124, NWS Shreveport, LA

April 14, 20187 parishes in Louisiana; Union County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 14, 2018, 1:45 AM CDT for 7 parishes in Louisiana; Union County, Arkansas. It was in force for 75 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 14, 2018, 1:45 AM CDT (06:45 UTC)
Expired: Apr 14, 2018, 3:00 AM CDT
In force: 75 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, Caldwell Parish, LA, Claiborne Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 121 km from the middle of the area, began a volume at 06:49 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 13, 9:53 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 6.8 hours before the alert went out and 112 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: 1539 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1018 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 238 m²/s²
0-3 km storm-relative helicity: 235 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 13.1

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 14, 1:24 AM CDT, 21 minutes earlier.

Area forecast discussion, Apr 14, 1:24 AM CDT, 21 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
124 AM CDT Sat Apr 14 2018

.DISCUSSION...
We have cleared much of the cwa from Cherokee to Miller and
Howard. Threat continues with this large squall line and isolated
embedded tornadoes for S AR and much of our LA parishes and deep
E TX. /24/

&&

.PREV DISCUSSION... /issued 1007 PM CDT Fri Apr 13 2018/

UPDATE...
To add replacing Tornado watch number 45 for entire cwa.

DISCUSSION...
No major changes to package with just a few tweaks to sky and
temps on the curve toward previously forecasted lows. Also, we
have expanded 00-06Z pops/wx into the 06-09Z slot. We can make
additional changes with counties first dropped from the new watch.
All products up to date with graphics on home page next in line.
/24/

PREV DISCUSSION... /issued 643 PM CDT Fri Apr 13 2018/

UPDATE...
To add remaining SE cwa parishes into Tornado watch 40

DISCUSSION...
All products have been reissued to add headline for all zones
groupings and to remove afternoon wording. /24/

PREV DISCUSSION... /issued 626 PM CDT Fri Apr 13 2018/

AVIATION...
Isolated to scattered -SHRA/-TSRA have developed across the Four-
State Region today, courtesy of an approaching strong upper level
disturbance from the west. This precipitation has been
intermittently affecting the majority of the terminals today, and
is expected to develop into a line of TSRA more less later this
evening /progressing from west to east along a cold front/. This
TAF forecast will not be an easy one, as will try to pinpoint
best timing of the precipitation. Some of these storms will be
capable of becoming severe with large hail, damaging wind gusts
and isolated tornadoes being the main threats. Will of course
amend as necessary. Otherwise, CIGS have risen to VFR early this
evening, but as anticipated to drop into the MVFR and possibly IFR
criteria after sunset. CIGS are poised to gradually improve to
VFR and precipitation will be coming to an end from west to east
towards the end of the TAF period, with perhaps the eastern
terminals hanging on to by tomorrow mid-morning VCSH. Southerly
winds will be intermittently breezy but is anticipated to drop to
below Lake Wind Advisory criteria overnight. Concurrently, winds
will be shifting to the west-northwest with the passage of a cold
front and thus could see -SHRA develop along the front, hence the
insertion of the -SHRA/VCSH towards the end of the TAF period.

&&

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

24/29

Hazardous weather outlook, Apr 13, 2:01 PM CDT, 11 hours 44 minutes before

Hazardous Weather Outlook...UPDATED
National Weather Service Shreveport LA
201 PM CDT Fri Apr 13 2018

ARZ050-051-059>061-070>073-LAZ001>006-010>012-017-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-141100-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Sabine-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
201 PM CDT Fri Apr 13 2018

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...This Afternoon and Tonight...

Tornado Watch #40 is in effect until 10 PM CDT tonight. This is a
particularly dangerous situation.

Severe thunderstorms are likely ahead of a dryline and cold front this
afternoon through this evening and overnight. Threats of large
hail, damaging winds, tornadoes, and locally heavy rainfall are
all possible during this event. The severe potential will shift to
more of a damaging wind threat as storms evolve into a squall
line tonight just ahead of the cold front. The severe threat
should be ending prior to daybreak on Saturday. Total rainfall
amounts up to three to four inches will be possible across parts
of north central Louisiana and south central Arkansas, increasing
the threat of isolated flash flooding across these areas.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Thunderstorms will be gradually ending from west to east with a
cold frontal passage early Saturday morning, bringing an end to
the severe threat. Therefore, no hazardous weather is expected at
this time.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators and storm spotters will likely be needed this afternoon
and into the overnight and early morning hours of Saturday.

LAZ013-014-018>022-141100-
Jackson-Ouachita-Natchitoches-Winn-Grant-Caldwell-La Salle-
201 PM CDT Fri Apr 13 2018

This Hazardous Weather Outlook is for portions of north central
Louisiana and northwest Louisiana.

.DAY ONE...This Afternoon and Tonight...

Severe thunderstorms are likely this evening and overnight.
Threats of large hail, damaging winds, tornadoes, and locally
heavy rainfall are all possible during this event. The severe
potential will shift to more of a damaging wind threat as storms
evolve into a squall line tonight just ahead of the cold front.
The severe threat should be ending prior to daybreak on Saturday.
Total event rainfall amounts up to three to four inches will be
possible across parts of north central Louisiana and south central
Arkansas, increasing the threat of isolated flash flooding across
these areas.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

Thunderstorms will be gradually ending from west to east with a
cold frontal passage early Saturday morning, bringing an end to
the severe threat. Therefore, no hazardous weather is expected at
this time.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators and storm spotters will likely be needed this afternoon
and into the overnight and early morning hours of Saturday.

09

In the hours before

Special weather statement, Apr 14, 1:13 AM CDT, 32 minutes before

Special Weather Statement
National Weather Service Shreveport LA
113 AM CDT SAT APR 14 2018

ARZ073-140630-
Union AR-
113 AM CDT SAT APR 14 2018

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL UNION COUNTY UNTIL 130 AM
CDT...

At 113 AM CDT, Doppler radar was tracking a strong thunderstorm near
Lawson, or 11 miles east of Norphlet, moving northeast at 50 mph.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Calion, Urbana, Lawson, Moro Bay State Park and Pigeon Hill.

A tornado watch remains in effect until 600 AM CDT for south central
Arkansas.

LAT...LON 3325 9223 3312 9249 3328 9260 3332 9253
      3332 9249 3333 9248 3330 9246 3329 9247
      3327 9244 3328 9238 3330 9235 3328 9234
      3328 9233 3326 9232 3328 9230 3326 9229
TIME...MOT...LOC 0613Z 233DEG 45KT 3328 9247

FB

Local storm report, Apr 14, 1:15 AM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
115 AM CDT SAT APR 14 2018

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

1230 AM     FUNNEL CLOUD     2 WSW RED CHUTE         32.56N 93.64W
04/14/2018                   BOSSIER            LA   TRAINED SPOTTER

            TRAINED SPOTTER ALONG MIDLAND STREET SAW A
            FUNNEL AND POWER FLASHES JUST TO THE
            SOUTHWEST OF LOCATION.

&&

20

Local storm report, Apr 14, 1:17 AM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
117 AM CDT SAT APR 14 2018

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

0105 AM     TSTM WND DMG     2 E EMERSON             33.10N 93.16W
04/14/2018                   COLUMBIA           AR   EMERGENCY MNGR

            TREES AND POWER LINES DOWN ALONG CR 16 EAST
            OF BUSSEY, AR.

&&

25

Local storm report, Apr 14, 1:23 AM CDT, 22 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
123 AM CDT SAT APR 14 2018

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

1105 PM     TSTM WND DMG     6 NNW HENDERSON         32.24N 94.82W
04/13/2018                   RUSK               TX   LAW ENFORCEMENT

            TREES REPORTED DOWN ACROSS THE COUNTY, AND
            FM 2276.

&&

25

Local storm report, Apr 14, 1:32 AM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
132 AM CDT SAT APR 14 2018

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

1215 AM     TSTM WND DMG     1 NNE SHREVEPORT        32.49N 93.79W
04/14/2018                   CADDO              LA   BROADCAST MEDIA

            REPORTS OF DEBRIS AND NUMEROUS LIMBS DOWN IN
            AREAS JUST NORTH OF FAIR PARK MIDDLE SCHOOL.

&&

20

Local storm report, Apr 14, 1:43 AM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
143 AM CDT SAT APR 14 2018

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

1145 PM     TSTM WND DMG     JEFFERSON               32.76N 94.35W
04/13/2018                   MARION             TX   EMERGENCY MNGR

            WIDESPREAD TREES AND POWER LINES DOWN OVER
            ROADWAYS ACROSS ENTIRE COUNTY.

&&

20

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 7:51 PM CDT	Tornado Warning	SHV	Bowie	25 min
Apr 13, 9:47 PM CDT	Special Weather Statement	SHV	Wood	13 min
Apr 13, 10:00 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Camp, Cherokee, Franklin, Gregg, Nacogdoches and 4 more	60 min
Apr 13, 10:19 PM CDT	Special Weather Statement	SHV	Bowie, Franklin, Morris, Red River, Titus	41 min
Apr 13, 10:57 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Franklin, Gregg, Harrison and 9 more	33 min
Apr 13, 11:10 PM CDT	Tornado Warning	SHV	Cass, Gregg, Harrison, Marion, Upshur	23 min
Apr 13, 11:30 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Harrison, Marion, Panola	45 min
Apr 13, 11:54 PM CDT	Tornado Warning	SHV	Harrison, Panola	21 min
Apr 13, 11:57 PM CDT	Special Weather Statement	SHV	Angelina, Nacogdoches, San Augustine, Shelby	48 min
Apr 14, 12:15 AM CDT	Severe Thunderstorm Warning	SHV	Panola	45 min
Apr 14, 1:10 AM CDT	Special Weather Statement	SHV	Sabine, San Augustine	65 min
Apr 14, 4:24 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	15 hr
Apr 13, 7:11 PM CDT	Tornado Warning Tornado observed	SHV	Union	34 min
Apr 13, 7:35 PM CDT	Tornado Warning	SHV	Caldwell, Ouachita	40 min
Apr 13, 8:16 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	29 min
Apr 13, 8:17 PM CDT	Tornado Warning	SHV	Caldwell, Ouachita	28 min
Apr 14, 12:14 AM CDT	Tornado Warning	SHV	Bossier, Caddo	31 min
Apr 14, 12:43 AM CDT	Tornado Warning	SHV	Bossier, Claiborne, Webster	32 min
Apr 14, 12:46 AM CDT	Tornado Warning	SHV	Bossier, Claiborne, Webster	29 min
Apr 14, 12:59 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, De Soto, Jackson and 6 more	46 min
Apr 14, 1:08 AM CDT	Tornado Warning	SHV	Claiborne, Webster	25 min
Apr 14, 1:11 AM CDT	Tornado Warning	SHV	Claiborne	34 min
Apr 14, 1:30 AM CDT	Tornado Warning	SHV	Claiborne, Union	33 min
Apr 14, 1:52 AM CDT	Tornado Warning	SHV	Bienville, Jackson, Lincoln, Ouachita, Union	38 min
Apr 14, 1:56 AM CDT	Tornado Warning	SHV	Natchitoches, Winn	34 min
Apr 14, 2:26 AM CDT	Tornado Warning	SHV	Jackson, Winn	34 min
Apr 14, 2:27 AM CDT	Tornado Warning	SHV	Lincoln, Ouachita, Union	33 min
Apr 14, 2:31 AM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita	29 min
Apr 14, 2:51 AM CDT	Tornado Warning	SHV	Caldwell, Jackson, Ouachita	24 min
Apr 14, 2:59 AM CDT	Tornado Warning	SHV	Jackson, Ouachita, Union	31 min
Apr 14, 3:14 AM CDT	Tornado Warning	SHV	Caldwell, Ouachita	20 min
Apr 13, 8:15 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	45 min
Apr 13, 8:53 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	29 min
Apr 13, 9:27 PM CDT	Special Weather Statement	SHV	Howard, Sevier	48 min
Apr 13, 11:35 PM CDT	Special Weather Statement	SHV	Little River, Sevier	40 min
Apr 14, 1:13 AM CDT	Special Weather Statement	SHV	Union	17 min
Apr 14, 1:28 AM CDT	Tornado Warning	SHV	Columbia, Union	32 min
Apr 14, 2:01 AM CDT	Tornado Warning	SHV	Union	29 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2018 Severe Thunderstorm Warnings in Arkansas, 2018 Every severe thunderstorm warning in 2018

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.