Scattered showers and thunderstorms developed during the afternoon and evening hours across East Texas, Southern Arkansas, and much of North Louisiana, near a stationary front that extended from near the Red River of North Texas into Northeast Texas and North Louisiana. Moderate instability developed as afternoon temperatures climbed into the mid 90s, with abundant moisture in place with the…
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SHV wrote it up.
Scattered showers and thunderstorms developed during the afternoon and evening hours across East Texas, Southern Arkansas, and much of North Louisiana, near a stationary front that extended from near the Red River of North Texas into Northeast Texas and North Louisiana. Moderate instability developed as afternoon temperatures climbed into the mid 90s, with abundant moisture in place with the passage of a weak upper level disturbance atop the front. Strong thunderstorms developed over Northern Smith, Gregg, and Harrison Counties in East Texas and moved southeast across Lower East Texas south of Interstate 20. Gusty winds were observed from a strong thunderstorm over Eastern Gregg County on the east side of Longview, which blew down a tree onto Highway 80 west, causing two vehicles to crash into the tree. Fortunately, none of the vehicles' occupants were injured.
The local office's own words before the first event, 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 the first event at Aug 11, 1:51 PM CST, 3 hours 54 minutes earlier.
Area Forecast Discussion National Weather Service Shreveport LA 251 PM CDT Fri Aug 11 2017 .DISCUSSION... Outflow boundary from a convective complex across Oklahoma earlier this morning is now moving across north Louisiana and deep east Texas and is characterized by a line of thunderstorms from Warren, Arkansas, to Monroe, Louisiana, and points southwest to Center, Texas. Moisture pooling just ahead of the outflow boundary has created very short duration heat index spikes approaching 109 degrees. Elsewhere, heat index values have averaged in the upper 90s across the interstate 30 corridor and around 103 across deep east Texas and west-central Louisiana. Assuming afternoon high temperatures on Saturday to average around 93 degrees with dewpoint values in the mid to upper 70s, forecast heat index values will approach 105 degrees across mainly I-20 southward with an isolated report of 106 or 107 degrees. Leaning toward holding off on issuing a heat advisory for Saturday based on the fact that conditions will be marginal. Additionally, afternoon showers and thunderstorms could provide sufficient mixing to keep heat index values within reasonably safe levels. Main concern for this weekend is rainfall on Saturday night into Sunday morning. A weak frontal boundary is forecast to linger across the Red River in northeast Texas Saturday evening into Saturday night. A disturbance in the upper-level flow will allow for rapid destabilization and convective initiation after sunset on Saturday. Forecast models have been very erratic in terms of rainfall totals over the past several days with previous runs advertising 10+ inches across south-central Oklahoma on the northern bank of the Red River and recent model runs advertising around 4 inches. Despite this disparity, there is a high degree of confidence that a flash flood threat will exist on Saturday night for portions of northeast Texas and southeast Oklahoma. These areas are already 8 inches above normal for rainfall over the past 14 days. Because of saturated soils and slightly swollen rivers, runoff may be limited. Will continue to monitor forecast data for the possibility of flash flood watch issuance for Saturday night into Sunday. High temperatures during the weekend to average around 90 degrees across the region. Upper-level pattern to transition to a more zonal flow on Monday as upper-ridge to the west weakens. This will allow for more uniform and diurnally driven scattered afternoon convection early in the work week. Afternoon showers and thunderstorms to become isolated by midweek as upper-ridge rebuilds from the east. Upper ridge will push afternoon high temperatures back into the mid 90s through the end of the forecast period. && .PREV DISCUSSION... /issued 128 PM CDT Fri Aug 11 2017/ AVIATION... For the 11/18Z TAF period...VFR conditions currently at all the TAF sites, except MLU, where low clouds have hung on for most of the day. Convection has fired up across portions of East Texas, South Central Arkansas, and North Louisiana along an old outflow boundary from a a large thunderstorm complex over southern and eastern Oklahoma. Decided to keep VCTS at most of the sites due to coverage of convection and will make necessary amendments as storms near TAF sites. This convection should diminish after sunset but can't completely rule out a few lingering storms into the late evening hours. VFR conditions will generally prevail during the overnight period into tomorrow morning, with possibly some patchy fog/low clouds across LFK/ELD/MLU tonight and just after sunrise, but confidence is low at the moment. /20/ && .PRELIMINARY POINT TEMPS/POPS... SHV 76 92 76 90 / 40 40 40 40 MLU 74 92 75 89 / 40 40 20 50 DEQ 73 89 73 84 / 30 30 60 70 TXK 74 89 73 84 / 30 30 60 70 ELD 74 89 74 85 / 40 30 40 60 TYR 76 94 76 91 / 40 40 40 30 GGG 76 93 75 90 / 40 40 40 30 LFK 76 94 76 94 / 20 40 20 20 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...None. LA...None. OK...None. TX...None. && 05/20
Hazardous Weather Outlook National Weather Service Shreveport LA 1144 AM CDT Fri Aug 11 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>167-121645- 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- 1144 AM CDT Fri Aug 11 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...This Afternoon and Tonight... Remnants of a complex of showers and thunderstorms and an attendant upper level disturbance over Southern and Eastern Oklahoma will trigger scattered showers and thunderstorms this afternoon over portions of Northeast Texas, Southeast Oklahoma, Southwest Arkansas, and North Louisiana, especially as the air mass destabilizes with daytime heating. Isolated strong storms capable of producing gusty winds and brief heavy rainfall will be possible, with minor flooding of low lying, poor drainage areas possible as well in the slow moving storms. Isolated to scattered showers and thunderstorms should continue into this evening before gradually diminishing late. .DAYS TWO THROUGH SEVEN...Saturday through Thursday... Scattered showers and thunderstorms will remain possible over much of the region Saturday, as a weak surface front becomes stationary over portions of East Texas and North Louisiana, and weak upper level disturbances aloft traverse the front. Isolated strong storms capable of producing gusty winds and brief heavy rainfall will be possible along the frontal zone Saturday, but the threat for heavy rainfall and flash flooding will increase late Saturday night through Monday as another thunderstorm complex develops and moves east along the front. The front may begin to slowly lift back north late Monday, thus diminishing the heavy rainfall and flood threats. Showers and thunderstorms are expected to become more isolated to widely scattered Tuesday through Thursday, but new rises along the Red and Sulphur Rivers and their tributaries are likely for much of next week. .SPOTTER INFORMATION STATEMENT... Activation of emergency managers, spotter networks, and amateur radio operators, may be needed tonight.
Special Weather Statement
National Weather Service Shreveport LA
238 PM CDT FRI AUG 11 2017
LAZ005-006-012>014-021-112015-
Caldwell LA-Bienville LA-Lincoln LA-Ouachita LA-Union LA-Jackson LA-
238 PM CDT FRI AUG 11 2017
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CALDWELL...JACKSON...
EASTERN UNION...OUACHITA...SOUTHEASTERN BIENVILLE AND SOUTHEASTERN
LINCOLN PARISHES UNTIL 315 PM CDT...
At 237 PM CDT, Doppler radar was tracking a broken line of strong
thunderstorms along a line extending from near Crossett to near
Claiborne to 6 miles west of Jonesboro. Movement was east at 25 mph.
Winds in excess of 35 mph will be possible with these storms.
Locations impacted include...
Monroe, Ruston, Claiborne, West Monroe, Jonesboro, Columbia, Swartz,
Brownsville-Bawcom, Brownsville-Bawcomville, Farmerville, Richwood,
Sterlington, Choudrant, Marion, Chatham, Hodge, North Hodge, East
Hodge, Saline and Quitman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Brief heavy rainfall is also occurring with these storms, and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3215 9190 3209 9200 3211 9231 3215 9231
3216 9297 3301 9215 3301 9207 3273 9207
3269 9205 3271 9204 3271 9197 3266 9194
3266 9191 3260 9193 3253 9190 3240 9200
3228 9203 3227 9199 3219 9201 3216 9189
TIME...MOT...LOC 1937Z 285DEG 23KT 3307 9196 3257 9219 3221 9282
20Special Weather Statement
National Weather Service Shreveport LA
242 PM CDT FRI AUG 11 2017
LAZ010-011-017>019-112030-
De Soto LA-Winn LA-Natchitoches LA-Red River LA-Sabine LA-
242 PM CDT FRI AUG 11 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN DE SOTO...EASTERN
RED RIVER...NORTHERN NATCHITOCHES...NORTHEASTERN SABINE AND
NORTHWESTERN WINN PARISHES UNTIL 330 PM CDT...
At 241 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 13 miles southeast of Ringgold to 8 miles
southeast of Mansfield. Movement was southeast at 20 mph.
Winds in excess of 35 mph will be possible with these storms.
Locations impacted include...
Coushatta, Campti, Allen, Pleasant Hill, Martin, Goldonna, Dodson,
Ashland, Edgefield, Powhatan, Lake End, Evelyn, Hanna, Womack,
Pelican, Black Lake, Chestnut, Creston, Marthaville and Rambin.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Brief heavy rainfall is also occurring with these storms, and may
lead to localized flooding. Do not drive your vehicle through
flooded roadways.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3207 9264 3169 9338 3193 9374 3219 9321
3215 9319 3215 9288
TIME...MOT...LOC 1941Z 298DEG 17KT 3217 9316 3194 9361
20Special Weather Statement
National Weather Service Shreveport LA
436 PM CDT FRI AUG 11 2017
ARZ072-073-LAZ004-006-112215-
Union AR-Columbia AR-Union LA-Claiborne LA-
436 PM CDT FRI AUG 11 2017
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN UNION AND
SOUTHEASTERN COLUMBIA COUNTIES...NORTHWESTERN UNION AND NORTHERN
CLAIBORNE PARISHES UNTIL 515 PM CDT...
At 436 PM CDT, Doppler radar was tracking a strong thunderstorm near
Haynesville, or 14 miles north of Homer, moving east at 25 mph.
Winds in excess of 40 mph will be possible with this storm.
Locations impacted include...
Junction City, Haynesville, Bernice, Atlanta, Lisbon, Lillie, Hew
Hope, Three Creeks, Corney Lake, Antioch, Summerfield and Catesville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3276 9267 3276 9274 3287 9319 3310 9315
3310 9259
TIME...MOT...LOC 2136Z 274DEG 24KT 3300 9308
12The Shreveport radar (KSHV), 81 km away, was scanning. The volume nearest the first event began at 23:45 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree was blown down across the westbound lanes of Highway 80 in East Longview. Two vehicles then crashed into the tree. The windshields in both vehicles were shattered, with one car having to be towed away. Fortunately, none of the vehicles' occupants were injured.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2017Every state in 2017This day in weather historyWarnings in Texas, August 2017
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 707546.