Alert archive / Louisiana / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 116, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at Apr 26, 2017, 5:29 PM CDT for Angelina County, Sabine County, San Augustine County, Texas; 4 parishes in Louisiana. It was in force for 61 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, 5:29 PM CDT (22:29 UTC)
- Expired
- Apr 26, 2017, 6:30 PM CDT
- In force
- 61 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
- Hail
- 0.88 in
- Wind
- 60.0 mph
Counties Grant Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA, Winn Parish, LA, Angelina County, TX, Sabine County, TX, San Augustine County, TX
The radar
The Ft Polk radar (KPOE), 66 km from the middle of the area, began a volume at 22:33 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, 10.5 hours before the alert went out and 107 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.
- 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
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, 2:31 PM CDT, 2 hours 58 minutes earlier.
Area forecast discussion, Apr 26, 2:31 PM CDT, 2 hours 58 minutes before
Area Forecast Discussion
National Weather Service Shreveport LA
231 PM CDT Wed Apr 26 2017
.DISCUSSION...
...Very heavy rainfall likely for this weekend across Arkansas
and Southeast Oklahoma...
Cold front accompanied by a line of severe TSTMS to continue
pushing E through Thursday morning. This front to push into MS and
SE TX by during Thursday with negative vorticity advection and
cold air advection clearing skies and rainfall from NW to SE
through late tonight behind the cold front.
For Thursday, expect quiet weather with a stable and dry airmass
behind the front. By Friday, another trough develops and deepens
over the four corners of the desert SW with a deep tropical
moisture fetch advecting N from the southern Gulf of Mexico into
the central U.S.
During this weekend, the trough slowly ejects E into the OK and
KS. All forecasts models show very heavy rainfall developing in AR
during much of this weekend. Accordingly, expect the flooding
threat to increase across the N half of the ArkLaTex region this
weekend into early next week with storm total amounts upwards of
ten inches in the favored locations of the Ouachita Mountains. In
addition, we can expect severe weather with the passage of a line
or even two lines of TSTMS during Saturday and Sunday.
Expect quiet weather to then begin next week and the beginning of
May behind the cold front that sweeps across the region during
Sunday. /VIII/.
&&
.PREV DISCUSSION... /issued 111 PM CDT Wed Apr 26 2017/
AVIATION...
For the ArkLaTex, Squall line coming together near KTYR/KTXK/KLIT
moving E at 30KTS. At this pace 19Z-01Z is currently in TAFS with
all terminals sporting tempo groups for wind to 40KT and 1sm, of
course some variation will occur and further amendments to follow
observed pace on our radar. Sfc winds are S/SE over LA, but SW/S
over TX with the former potentially tornadic this aftn with decent
heating. W/NW will follow convection closely and strong sustained
values will quickly drop off W to E with only weak high pressure.
/24/
&&
.PRELIMINARY POINT TEMPS/POPS...
SHV 48 78 62 87 / 30 10 10 20
MLU 52 77 60 87 / 50 10 10 20
DEQ 42 75 56 81 / 30 0 10 30
TXK 46 76 59 84 / 40 0 10 30
ELD 48 76 58 84 / 60 10 10 20
TYR 47 80 64 87 / 20 0 10 20
GGG 46 79 63 87 / 20 0 10 20
LFK 51 85 65 92 / 20 0 10 20
&&
.SHV WATCHES/WARNINGS/ADVISORIES...
AR...Lake Wind Advisory until 2 AM CDT Thursday for ARZ050-051-
059>061-070>073.
LA...Lake Wind Advisory until 2 AM CDT Thursday for LAZ001>006-
010>014-017>022.
OK...Lake Wind Advisory until 2 AM CDT Thursday for OKZ077.
TX...Lake Wind Advisory until 2 AM CDT Thursday for TXZ096-097-
108>112-124>126-136>138-149>153-165>167.
&&
08Hazardous weather outlook, Apr 26, 11:19 AM CDT, 6 hours 10 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, 3:39 PM CDT, 1 hour 50 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
339 PM CDT WED APR 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0315 PM TSTM WND DMG 3 N JEFFERSON 32.81N 94.34W
04/26/2017 MARION TX LAW ENFORCEMENT
SHERIFF DEPARTMENT REPORTS TREES DOWN ACROSS
FM ROAD 1324.
&&
20Local storm report, Apr 26, 4:03 PM CDT, 1 hour 26 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
403 PM CDT WED APR 26 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0354 PM HAIL 1 SE WELLS 31.48N 94.93W
04/26/2017 E1.00 INCH CHEROKEE TX PUBLIC
&&Local storm report, Apr 26, 4:11 PM CDT, 1 hour 18 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.
&&
20Local storm report, Apr 26, 4:33 PM CDT, 56 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.
&&
20Local storm report, Apr 26, 4:50 PM CDT, 39 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.
&&
20Local storm report, Apr 26, 5:00 PM CDT, 29 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
&&
20The 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, 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, 6:02 PM CDT | Severe Thunderstorm Warning | SHV | Lincoln, Ouachita, Union | 20 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, 2017Severe Thunderstorm Warnings in Texas, 2017Every 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.