A band of showers and thunderstorms developed during the early morning hours of July 19th across portions of Southeast Oklahoma and Southwest Arkansas, near a weak surface front and associated upper level trough that slowly sank south into East Texas and North Louisiana by/shortly after daybreak. Given the high moisture content available, adequate forcing aloft and available weak to moderate…
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The episode as NWS SHV wrote it up.
A band of showers and thunderstorms developed during the early morning hours of July 19th across portions of Southeast Oklahoma and Southwest Arkansas, near a weak surface front and associated upper level trough that slowly sank south into East Texas and North Louisiana by/shortly after daybreak. Given the high moisture content available, adequate forcing aloft and available weak to moderate instability contributed to these storms becoming efficient rainfall producers, resulting in periods of heavy rain falling over portions of East Texas as additional showers and thunderstorms developed and spread southeast over the same areas of East Texas even through the early afternoon. Widespread rainfall amounts of three to six inches fell across Smith and Gregg Counties, with isolated higher amounts in excess of seven inches recorded over Northern Smith County. This resulted in flash flooding across the cities of Lindale and Longview, with high water rescues needed for stranded motorists in the flood waters. These showers and thunderstorms eventually diminished during the mid and late afternoon hours with the passage of the weak front.
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 Jul 19, 4:56 AM CST, 4 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Shreveport LA 556 AM CDT Mon Jul 19 2021 .AVIATION... Finally seeing that uptick in convective coverage we've been waiting for across S AR into NE TX attm. Look for this convection to shift south and east, encompassing our I-20 Corridor terminal locations later this morning and eventually the LFK terminal by late this morning into the afternoon. In the wake of this initial band, we could see more redeveloping convection redevelop later today as well. With the 12z TAF package, have prevailed TSRA at both the TXK and ELD terminals with VCTS riding for a few more hours across the I-20 terminals before prevailing TSRA later this morning. Ceilings will vary wildly with in and out convection was witnessed at TXK earlier, ranging from IFR to low VFR ceilings with wind gusts near 30kts possible. 13 && .PREV DISCUSSION... /issued 313 AM CDT Mon Jul 19 2021/ SHORT TERM.../Today through Tuesday/ Finally beginning to see an uptick in convection across the Middle Red River Valley of NE TX, SE OK and SW and SC Arkansas early this morning. Models have been greatly overestimating storm coverage thus far but with upper forcing only expected to increase from the north and west today, we should continue to see increasing storm coverage from north to south tied to daytime heating. The above mentioned upper trough axis currently extends from the Mid Miss Valley south and west into NE OK and the Upper Red River Valley. This trough will shift south and east today, which combined with daytime heating and PWATS in the vicinity of 2 inches, can't help but see increasing convection, some of which could be heavy at times, especially along and in advance of a southward moving cold front in association with the trough itself. The frontal boundary is very weak attm, located northwest of the I-30 Corridor, but will slowly shift southward to just north of the I-20 Corridor of NE TX and N LA late this afternoon, moving south of the corridor late tonight before stalling across our southern third during the day Tuesday. Have continued the heavy rainfall mention in the grids for this morning south and east of the I-30 Corridor and near and south of the I-20 Corridor this afternoon. It may be noted that storm coverage should remain high north of the boundary given the degree of upper forcing associated with the trough itself but the heavy rainfall potential should be located along and/or ahead of the surface boundary through this 00z this evening. Stayed close to NBM high temps today but where we do not see much in the way of recovery, I can see a few areas where forecast temps are too warm but given the delay in storm coverage, did not deviate too much. The same would go for overnight lows. For Tuesday, our northwest third tries to dry out given the reduction on PWAT with this area being to the northwest of the upper trough axis which by Tue Aftn should be located near an ELD, SHV LFK line. It's along and east of this line where the best storm coverage should be located and thus, have advertised high chance to likely pops across our southeast half for Tue but have left out any heavy rainfall mention for now. Tuesday appears to be our coolest day of the week with afternoon highs ranging in the lower to middle 80s across our southeast to the upper 80s across our northwest zones. 13 LONG TERM.../Tuesday Night through Sunday Night/ By Tuesday evening, the aforementioned frontal boundary will stall either in our extreme southern zones or just south of our CWA. This will allow much drier conditions across the region into Wednesday morning. However, this will be short-lived as the boundary will lift northward by Wednesday afternoon, bringing rain chances back into the region. By Thursday and Friday, the boundary will wash out north of the region, but a moist unstable airmass will remain in place. Widespread rain chances will remain across the region, as models continue to suggest that an upper low will develop and meander somewhere across Central Texas. Peak convection coverage will likely be during the afternoon hours with daytime heating. The upper low will retrograde into far West Texas and Northern Mexico by next weekend. At the same time, a broad upper ridge across the Rockies will build eastward into the Central/Southern Plains and eventually into portions of the Lower Mississippi Valley. This should result in much drier conditions. However, can't rule out some isolated diurnal convection, especially over our eastern zones on Saturday, which will be on the eastern fringe of the ridge. By Sunday, the upper ridge will continue to expand eastward, resulting in dry conditions areawide. Humid conditions will remain across the region during the work week with high temperatures in the lower 90s. However, with the upper ridge moving over the region next weekend, expect above normal temperatures, with afternoon highs possibly in the upper 90s. /20/ && .PRELIMINARY POINT TEMPS/POPS... SHV 87 71 85 71 / 70 50 40 20 MLU 87 71 84 70 / 70 50 60 30 DEQ 88 68 88 68 / 60 30 20 0 TXK 88 71 87 71 / 70 30 30 10 ELD 86 68 84 67 / 70 40 40 20 TYR 89 72 87 71 / 70 50 30 10 GGG 87 71 87 70 / 70 50 30 10 LFK 91 72 87 71 / 70 60 50 20 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...None. LA...None. OK...None. TX...None. && 13/13/20
Hazardous Weather Outlook National Weather Service Shreveport LA 347 AM CDT Mon Jul 19 2021 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-200900- 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- 347 AM CDT Mon Jul 19 2021 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... Showers and thunderstorms to become areawide today as a weak frontal boundary push southward into the region. Locally gusty winds will be possible along with brief heavy rainfall, which could result in flash flooding of low lying and poor drainage areas. Convection may persist into the late evening and overnight hours, shifting further southward into portions of East Texas and North Louisiana. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday... Showers and thunderstorms will continue on Tuesday near the frontal system, as it continues to drift through the region before becoming stationary just south of the CWA. This boundary will return northward as a warm front on Wednesday, with the focus of additional storms over East Texas. North Louisiana, and Southern Arkansas. The boundary will washout north of the region late Wednesday evening, but afternoon scattered convection will remain possible over the region on Thursday and Friday as an upper level low begins to drift westward into Central Texas. Isolated strong thunderstorms capable of producing locally gusty winds can not be ruled out each day next week, but the primary threat will be locally heavy rainfall, which may result in flooding of low lying, poor drainage areas. By next weekend, upper ridging will build into the region, bringing warmer and much drier conditions. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters should not be needed through tonight.
Special Weather Statement
National Weather Service Shreveport LA
557 AM CDT Mon Jul 19 2021
ARZ070-071-LAZ001-002-TXZ112-126-191145-
Lafayette AR-Miller AR-Bossier LA-Caddo LA-Cass TX-Marion TX-
557 AM CDT Mon Jul 19 2021
...SPECIAL WEATHER STATEMENT...
At 556 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Garland to near Brightstar to 8 miles
north of Linden. Movement was south at 20 mph.
Winds in excess of 35 mph will be possible with these storms.
Locations impacted include...
Atlanta, Lewisville, Vivian, Jefferson, Linden, Queen City, Fouke,
Bradley, Hosston, Rodessa, Garland, Ida, Bivins, Lodi, Smithland,
Ravanna, McLeod, Berea, Brightstar and Kildare.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential 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 3308 9352 3284 9391 3274 9445 3316 9446
3324 9401 3347 9356
TIME...MOT...LOC 1056Z 348DEG 17KT 3337 9375 3319 9400 3313 9437
20Special Weather Statement National Weather Service Shreveport LA 727 AM CDT Mon Jul 19 2021 TXZ110>112-125-126-138-191315- Upshur TX-Harrison TX-Cass TX-Camp TX-Marion TX-Morris TX- 727 AM CDT Mon Jul 19 2021 ...SIGNIFICANT WEATHER ADVISORY FOR MARION...SOUTHWESTERN CASS... NORTHWESTERN HARRISON...NORTHEASTERN UPSHUR...SOUTHERN MORRIS AND SOUTHEASTERN CAMP COUNTIES UNTIL 815 AM CDT... At 727 AM CDT, Doppler radar was tracking a strong thunderstorm near Cedar Springs, or 13 miles southeast of Pittsburg, moving southeast at 35 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Marshall, Jefferson, Lone Star, Ore City, Woodlawn, Berea, Cedar Springs, Harleton, Avinger, Lassater, Holly Springs, Lafayette and Center Point. LAT...LON 3283 9490 3300 9481 3280 9418 3255 9432 TIME...MOT...LOC 1227Z 295DEG 31KT 3289 9478 04
Special Weather Statement National Weather Service Shreveport LA 732 AM CDT Mon Jul 19 2021 TXZ124-125-137-138-191315- Upshur TX-Gregg TX-Harrison TX-Wood TX- 732 AM CDT Mon Jul 19 2021 ...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL HARRISON...EAST CENTRAL WOOD...UPSHUR AND CENTRAL GREGG COUNTIES UNTIL 815 AM CDT... At 730 AM CDT, Doppler radar was tracking a strong thunderstorm over Rosewood, or 8 miles west of Gilmer, moving southeast at 35 mph. Wind gusts up to 50 mph will be possible with this storm. Locations impacted include... Longview, White Oak, Gladewater, Gilmer, Hallsville, Clarksville City, East Mountain, Diana, Rosewood, West Mountain, Harleton, Union Grove, Warren City, Perryville, Bettie, Grice, Pritchett and Judson. LAT...LON 3275 9533 3290 9523 3266 9449 3239 9466 TIME...MOT...LOC 1230Z 293DEG 29KT 3276 9509 04
Special Weather Statement
National Weather Service Shreveport LA
817 AM CDT Mon Jul 19 2021
TXZ125-126-137-138-191400-
Upshur TX-Gregg TX-Harrison TX-Marion TX-
817 AM CDT Mon Jul 19 2021
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN MARION...HARRISON...
CENTRAL UPSHUR AND GREGG COUNTIES UNTIL 900 AM CDT...
At 817 AM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Berea to near Harleton to near Gladewater.
Movement was southeast at 25 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Longview, Marshall, Kilgore, White Oak, Gladewater, Gilmer,
Hallsville, Jefferson, Clarksville City, East Mountain, Berea,
Harleton, Diana, Rosewood, Karnack, Liberty City, Woodlawn, West
Mountain, Lakeport and Easton.
LAT...LON 3275 9472 3286 9446 3262 9406 3241 9425
3239 9453 3241 9456 3239 9458 3237 9492
3253 9499 3254 9499 3252 9500 3276 9512
TIME...MOT...LOC 1317Z 312DEG 23KT 3275 9444 3261 9458 3256 9502
04The Shreveport radar (KSHV), 84 km away, was scanning. The volume nearest the first event began at 15:04 UTC.
5 flash flood. Local standard time, as filed.
Flooding reported at the intersection of Green and Cotton Street.
Flooding reported at the intersection of Cotton and High Street. Several water rescues were required for stranded motorists in the flood waters.
Flooding reported on County Roads 468 and 463 along with several other roads.
Driver pulled over on County Road 468 to avoid high water and water rose around him within minutes, trapping him inside his vehicle. Lindale Fire Department performed a high water rescue.
Texas DPS reported that the Allen Branch Creek overpass at I-20 west near Lindale was eroded due to flooding, causing a large pine tree to fall on I-20 and resulting in 5 vehicles and a gooseneck trailer wrecking. Four injuries were reported, but none were life-threatening.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2021Every state in 2021This day in weather historyWarnings in Texas, July 2021
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: 965300, 965682, 965685, 965686, 965687.