Alert archive / Louisiana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 117, NWS Shreveport, LA

April 26, 2017Lincoln Parish, Ouachita Parish, Union Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 26, 2017, 6:02 PM CDT for Lincoln Parish, Ouachita Parish, Union Parish, Louisiana. It was in force for 20 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 26, 2017, 6:02 PM CDT (23:02 UTC)
Expired: Apr 26, 2017, 6:22 PM CDT
In force: 20 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 137 km from the middle of the area, began a volume at 23:04 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 26, 4:44 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.0 hours before the alert went out and 128 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: 761 J/kg
Mixed-layer CIN: -435 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 324 m²/s²
0-3 km storm-relative helicity: 327 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Apr 26, 5:32 PM CDT, 30 minutes earlier.

Area forecast discussion, Apr 26, 5:32 PM CDT, 30 minutes before

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Hazardous weather outlook, Apr 26, 11:19 AM CDT, 6 hours 43 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1119 AM CDT Wed Apr 26 2017

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-271630-
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-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
1119 AM CDT Wed Apr 26 2017

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 potent cold front will move across the Four State Region
through this evening. Very strong southerly winds ahead of the
cold front will increase instability across the region, leading to
the development of a line of thunderstorms along the front. Some
of the thunderstorms will be severe with large hail, damaging wind
gusts, and an isolated tornado or two across the northern half of
the ArkLaTex region. In addition, windy conditions will occur
along, ahead, and just behind the cold front, with sustained wind
speeds increasing into the 15 to 25 mph range, with gusts nearing
40 mph or higher this afternoon through this evening. A Lake Wind
Advisory is therefore in effect from through 9 pm this Wednesday
evening.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

Very warm, humid, and unstable conditions will return to the
region by Friday as a warm front lifts back north, with isolated
to scattered showers and thunderstorms possible along and north of
this returning front Thursday night and Friday. An isolated
severe thunderstorm can not be ruled out Friday with this
activity.

The approach of another upper level disturbance for the weekend
will result in the development of a line of thunderstorms along a
cold front, that will move across the Four State Region from west
to east during Saturday night into Sunday morning. Once again,
strong wind shear and instability may lead to some of the
thunderstorms becoming strong to severe.

In addition, very heavy rainfall upwards to a foot is possible
across portions of central and southern Arkansas during this
upcoming weekend. Accordingly, the flooding threat increases
markedly this weekend and early next week as Arkansas rivers and
bayous respond to the heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will be required early this
Wednesday afternoon through this Wednesday evening.

VIII.

In the hours before

Local storm report, Apr 26, 4:11 PM CDT, 1 hour 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
411 PM CDT WED APR 26 2017

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

0400 PM     HAIL             5 S WELLS               31.42N 94.94W
04/26/2017  E1.00 INCH       ANGELINA           TX   PUBLIC

            PUBLIC REPORTS QUARTER SIZE HAIL VIA KTRE-TV
            FACEBOOK PAGE IN THE REDTOWN COMMUNITY NEAR
            POLLOCK.

&&

20

Local storm report, Apr 26, 4:33 PM CDT, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
433 PM CDT WED APR 26 2017

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

0325 PM     TSTM WND DMG     6 WSW TATUM             32.29N 94.61W
04/26/2017                   RUSK               TX   EMERGENCY MNGR

            TREES DOWN ACROSS COUNTY ROAD 2142.

&&

20

Local storm report, Apr 26, 4:50 PM CDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
450 PM CDT WED APR 26 2017

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

0434 PM     HAIL             LUFKIN                  31.34N 94.73W
04/26/2017  E1.75 INCH       ANGELINA           TX   PUBLIC

            PUBLIC REPORTS GOLFBALL SIZE HAIL VIA
            KTRE-TV FACEBOOK PAGE.

&&

20

Local storm report, Apr 26, 5:00 PM CDT, 1 hour 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
500 PM CDT WED APR 26 2017

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

0455 PM     HAIL             HUNTINGTON              31.28N 94.58W
04/26/2017  E1.00 INCH       ANGELINA           TX   TRAINED SPOTTER

&&

20

Local storm report, Apr 26, 5:34 PM CDT, 28 minutes before

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Local storm report, Apr 26, 6:02 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 12:27 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	21 hr
Apr 26, 7:52 AM CDT	Special Weather Statement	SHV	Red River	38 min
Apr 26, 9:10 AM CDT	Special Weather Statement	SHV	Red River	35 min
Apr 26, 9:47 AM CDT	Special Weather Statement	SHV	Red River	28 min
Apr 26, 10:06 AM CDT	Severe Thunderstorm Warning	SHV	Red River	24 min
Apr 26, 12:08 PM CDT	Special Weather Statement	SHV	Franklin	52 min
Apr 26, 12:35 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Red River, Titus	40 min
Apr 26, 1:12 PM CDT	Special Weather Statement	SHV	Titus	48 min
Apr 26, 1:13 PM CDT	Special Weather Statement	SHV	Wood	32 min
Apr 26, 1:32 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Upshur, Wood	43 min
Apr 26, 2:16 PM CDT	Special Weather Statement	SHV	Cass	44 min
Apr 26, 2:19 PM CDT	Special Weather Statement	SHV	Gregg, Smith	41 min
Apr 26, 2:37 PM CDT	Special Weather Statement	SHV	Gregg	38 min
Apr 26, 3:09 PM CDT	Severe Thunderstorm Warning	SHV	Cass, Harrison, Marion	17 min
Apr 26, 3:19 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola, Rusk	41 min
Apr 26, 3:46 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches	24 min
Apr 26, 4:33 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	42 min
Apr 26, 5:00 PM CDT	Severe Thunderstorm Warning	SHV	Angelina	33 min
Apr 26, 5:29 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Sabine, San Augustine	61 min
Apr 26, 4:04 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Webster	24 min
Apr 26, 4:28 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	24 min
Apr 26, 5:14 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Natchitoches, Red River	46 min
Apr 26, 5:18 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	21 min
Apr 26, 5:26 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln	49 min
Apr 26, 10:08 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	52 min
Apr 26, 10:45 AM CDT	Special Weather Statement	SHV	Sevier	30 min
Apr 26, 12:06 PM CDT	Special Weather Statement	SHV	Sevier	39 min
Apr 26, 12:18 PM CDT	Severe Thunderstorm Warning	SHV	Howard, Little River, Sevier	42 min
Apr 26, 2:44 PM CDT	Special Weather Statement	SHV	Miller	46 min
Apr 26, 3:42 PM CDT	Severe Thunderstorm Warning	SHV	Columbia, Nevada	48 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2017 Every severe thunderstorm warning in 2017

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.