Scattered showers and thunderstorms developed over North-central Louisiana and Deep East Texas during the afternoon and evening hours on September 4th, along a weak surface boundary draped over these areas, as well as near a weak upper level trough extending from East Texas across North-central Louisiana. Strong heating atop a very moist and moderately unstable air mass contributed to clusters…
Every event with a place to put it. Tap one for its entry below.
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 over North-central Louisiana and Deep East Texas during the afternoon and evening hours on September 4th, along a weak surface boundary draped over these areas, as well as near a weak upper level trough extending from East Texas across North-central Louisiana. Strong heating atop a very moist and moderately unstable air mass contributed to clusters of strong thunderstorms, with an isolated severe thunderstorm developing over Central Shelby County Texas just east of Center, which downed numerous trees just east and south of town. This and the other storms quickly weakened shortly thereafter with the loss of daytime heating.
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 Sep 4, 6:11 PM CST, 1 hour 4 minutes earlier.
Area Forecast Discussion...UPDATED National Weather Service Shreveport LA 711 PM CDT Fri Sep 4 2020 .UPDATE... See below for 05/00 Aviation Discussion. Quick update issued as the Heat Advisory was allowed to expire at 00z. && .AVIATION... For the 05/00z TAFs, scattered convection will persist for the first few hours of the period across much of Western Louisiana and Texas south of the Interstate 20 corridor. Some of this activity may be strong at times with winds gusting to near 40 kts. KTYR, KGGG, KLFK, and possibly KSHV will be the TAF sites most likely to be affected. Showers and thunderstorms should mostly dissipate by 05/05z. MVFR ceilings are likely in most locations for a few hours around sunrise Saturday morning with a slow improvement back into the VFR range by early afternoon. Another round of scattered convection is expected south of Interstate 20 late in the period with KLFK having the best chances for rain with Saturday's storms. CN && .PREV DISCUSSION... /issued 308 PM CDT Fri Sep 4 2020/ SHORT TERM.../Tonight through Saturday Night/ The weak sfc trough that extended from Deep E TX across NCntrl LA this morning has begun to wash out, with higher theta-e air beginning to gradually spill back W with the light Erly bndry lyr flow. This leftover bndry, moderate instability characteristic of MLCapes of 2000-3000 J/Kg near and to its south, and the weak shear axis aloft that extends from the TX Hill Country NW into E TX/SW AR, has resulted in the development of sct convection over portions of Deep E TX and Ncntrl LA, with this convection slowly building WNW with the Erly low level winds. Given the ample moisture profile, proximity of the shear axis, and instability in place, have increased pops to low chance this evening over N LA/Lower E TX, with even some light returns and lowering cigs being noted in the radar imagery along the shear axis over portions of NE TX. Have maintained slight chance pops this evening farther N across NE TX/SE OK/SW AR, with the shear axis expected to linger overnight although the weak upper low along this axis continues to slowly retrograde SW to just W of ATT as of mid- afternoon. Still can't rule out isolated convection redevelopment late tonight across portions of E TX, with slight chance pops maintained. But fortunately, the lack of a SErly LLJ and weaker large scale forcing E of the departing upper low center should result in lesser coverage and thus lesser QPF amounts (if any) over the waterlogged areas of E TX. The short term progs continue to advertise a weak sfc front that will backdoor SW into SW AR late tonight, and into portions of N LA Saturday, which will result in drier air gradually spilling SW into these areas. Not expecting much in the way of cooling temps Saturday with near to slightly below normal temps again expected, although the advection of low and mid level dry air from the NE will negate much of the convection development over portions of extreme N LA. However, moisture pooling and the presence of the shear axis, which may be slowly reinforced S across E TX/N LA in response to increasing heights from the NW ahead of the Desert SW ridge and weak shortwave troughiness easing through the Mid MS Valley, should result in isolated to sct convection developing during the afternoon over portions of Lower E TX/WCntrl LA. Have maintained low to mid chance pops for these areas, tapering pops to slight chance closer to the I-20 corridor. This convection should diminish by sunset over much of these areas, but did hold on to slight chance pops during the evening for any residual convection over Deep E TX. Should begin to see the drier air mix farther W Saturday night resulting in slightly cooler temps by Sunday morning. 15 LONG TERM.../Sunday through Thursday night/ Starting at 12Z Sunday, a 1025ish sfc high will be over WV and still backdooring a 1020mb contour across most of the four-state area. There will be some pooled moisture on the backside into deep E TX that will gain additional real estate south of I-20 on Monday and bringing a slight chance for a few thunderstorms on the washing out frontal boundary. Low temps will be will range from the lower 60s across the north to near 70 far south and high temps both Sun/Mon in the upper 80s to lower 90 again respectively. Now for the trend we have all been advertising to turn cooler by mid to late week with much in the way of clouds and rain scattered around by midweek. Days of high chance pops day and night. The much anticipated cold front is coming into better agreement now with the ECMWF closer to the GFS. That's right, both long range models are indicating the long wave knocking on our door with the GFS having a core 567dam low over NW NB, and while not yet closed off, the ECMWF is right there with the 570 dam contour within 100 miles farther NW. Deep southwest flow will continue bringing the above average wet pattern (theme all year) into another typically very dry month. Poor Drought monitor has been twiddling it's thumbs. Green up predicted to linger all month, with the spider lilies already cropping in these latter rains. Late in the period the models both align exactly 569 dam low over ncntrl NB with the cold front overhead and moving slowly E as sfc high pressure begins to sweep into our eastern area at the end of this long term period. We can all look forward to 50s north and 70s for highs and about 5 degrees warmer in southern sections once all the clouds and rain drift farther East of us. /24/ && .PRELIMINARY POINT TEMPS/POPS... SHV 75 90 69 90 / 30 20 10 0 MLU 74 91 66 93 / 30 10 0 0 DEQ 71 88 65 88 / 20 0 0 0 TXK 71 86 66 87 / 20 10 0 0 ELD 71 88 63 91 / 20 10 0 0 TYR 72 87 69 90 / 30 30 10 0 GGG 73 89 68 90 / 30 30 10 0 LFK 74 92 71 93 / 30 40 20 10 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...None. LA...None. OK...None. TX...None. && 09/20
Hazardous Weather Outlook National Weather Service Shreveport LA 559 AM CDT Fri Sep 4 2020 ARZ050-051-059>061-070>073-LAZ001>006-010>014-021-022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-051100- Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette- Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto- Red River-Bienville-Jackson-Ouachita-Caldwell-La Salle-McCurtain- Bowie-Franklin-Titus-Camp-Morris-Cass-Wood-Upshur-Marion-Smith- Gregg-Harrison-Cherokee-Rusk-Panola-Nacogdoches-Shelby-Angelina- San Augustine-Sabine- 559 AM CDT Fri Sep 4 2020 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... Scattered to numerous showers and thunderstorms will be possible today, with the best chances across our southwest and western zones. Additionally, brief heavy rainfall will be possible with any of the stronger storms that develop. No severe weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday... Scattered showers and thunderstorms will be possible on Saturday across portions of deep east Texas. Otherwise, dry and warm conditions are expected through the weekend. Widespread showers and thunderstorms will return to the area on Tuesday ahead of an advancing cold front. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters may be necessary for the overnight hours. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines. LAZ017>020-051100- Sabine-Natchitoches-Winn-Grant- 559 AM CDT Fri Sep 4 2020 This Hazardous Weather Outlook is for portions of north central Louisiana and northwest Louisiana. .DAY ONE...Today and Tonight... Heat index values ranging between 100 and 105 degrees are possible this afternoon, as such another Heat Advisory has been issued for these parishes. Additionally, there is a chance for an isolated shower or thunderstorm to move through the area. No severe weather is expected. .DAYS TWO THROUGH SEVEN...Saturday through Thursday... Generally dry and warm conditions will prevail through the weekend, with a very small chance for an afternoon shower or thunderstorm on Saturday afternoon. Widespread showers and thunderstorms will return to the area on Tuesday ahead of a cold front that is expected to move through the area. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters may be necessary for tonight. Please relay any information about observed severe weather to the NWS while following all local, state, and CDC guidelines.
Special Weather Statement National Weather Service Shreveport LA 445 PM CDT Fri Sep 4 2020 LAZ018>020-042230- Winn LA-Natchitoches LA-Grant LA- 445 PM CDT Fri Sep 4 2020 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GRANT...EAST CENTRAL NATCHITOCHES AND SOUTHWESTERN WINN PARISHES UNTIL 530 PM CDT... At 444 PM CDT, Doppler radar was tracking a strong thunderstorm near Montgomery, or 12 miles north of Lena, moving northwest at 15 mph. Winds in excess of 40 mph will be possible with this storm. Locations impacted include... Natchitoches, Montgomery, Natchez, Atlanta, Bermuda, Aloha and St. Maurice. LAT...LON 3170 9260 3153 9283 3173 9312 3194 9277 TIME...MOT...LOC 2144Z 140DEG 12KT 3165 9281 20
Special Weather Statement
National Weather Service Shreveport LA
521 PM CDT Fri Sep 4 2020
TXZ149>153-042300-
Cherokee TX-Panola TX-Nacogdoches TX-Rusk TX-Shelby TX-
521 PM CDT Fri Sep 4 2020
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN PANOLA...SOUTHERN
RUSK...NORTHWESTERN NACOGDOCHES...NORTHWESTERN SHELBY AND
NORTHEASTERN CHEROKEE COUNTIES UNTIL 600 PM CDT...
At 521 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Douglass to near Sacul to 9 miles north of
Trawick to 7 miles southeast of Minden to near Garrison. Movement was
northwest at 20 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Henderson, Timpson, Garrison, Ponta, Pinehill, New Salem, Trawick,
Sacul, Douglass, Minden, New Summerfield, Cushing, Mount Enterprise,
Gallatin, Reklaw, Stockman, Linwood, Lilbert, Dotson and Laneville.
LAT...LON 3201 9521 3217 9494 3217 9477 3207 9448
3175 9435 3184 9457 3180 9469 3175 9476
3163 9479 3156 9483 3152 9491 3176 9507
TIME...MOT...LOC 2221Z 154DEG 17KT 3163 9486 3180 9491 3190 9479 3192
9463 3186 9447
20Special Weather Statement
National Weather Service Shreveport LA
533 PM CDT Fri Sep 4 2020
LAZ001-002-010-TXZ138-151-042315-
De Soto LA-Bossier LA-Caddo LA-Panola TX-Harrison TX-
533 PM CDT Fri Sep 4 2020
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN DE SOTO...
SOUTHWESTERN CADDO AND CENTRAL BOSSIER PARISHES...SOUTHEASTERN
HARRISON AND NORTHEASTERN PANOLA COUNTIES UNTIL 615 PM CDT...
At 533 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Dixie Inn to near Shreveport to 9 miles
southwest of Stonewall. Movement was northwest at 10 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Shreveport, Bossier City, Haughton, Greenwood, Blanchard, Waskom,
Benton, Stonewall, Deberry, Eastwood, Fosters, Keachi, Longstreet,
Keat Chie, Ferguson, Front, Spring Ridge, Fillmore, Cross Lake and
Bodcau.
LAT...LON 3219 9427 3258 9401 3282 9354 3274 9344
3255 9345 3241 9367 3212 9394
TIME...MOT...LOC 2233Z 121DEG 11KT 3262 9342 3245 9374 3218 9393
20Special Weather Statement National Weather Service Shreveport LA 545 PM CDT Fri Sep 4 2020 LAZ020-022-042330- La Salle LA-Grant LA- 545 PM CDT Fri Sep 4 2020 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GRANT AND WEST CENTRAL LA SALLE PARISHES UNTIL 630 PM CDT... At 544 PM CDT, Doppler radar was tracking a strong thunderstorm 12 miles north of Ball, or 18 miles north of Pineville, moving west at 15 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Pollock, Dry Prong, Fishville, Williana and Bentley. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3166 9225 3148 9228 3150 9263 3170 9262 TIME...MOT...LOC 2244Z 098DEG 12KT 3159 9235 20
Special Weather Statement National Weather Service Shreveport LA 546 PM CDT Fri Sep 4 2020 LAZ019-020-042330- Winn LA-Grant LA- 546 PM CDT Fri Sep 4 2020 ...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL GRANT AND SOUTHEASTERN WINN PARISHES UNTIL 630 PM CDT... At 545 PM CDT, Doppler radar was tracking a strong thunderstorm 16 miles southeast of Winnfield, moving west at 10 mph. Half inch hail and winds in excess of 40 mph will be possible with this storm. Locations impacted include... Georgetown, Atlanta and Williana. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with this storm, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3181 9237 3166 9240 3168 9276 3188 9274 TIME...MOT...LOC 2245Z 090DEG 10KT 3174 9247 20
Special Weather Statement
National Weather Service Shreveport LA
619 PM CDT Fri Sep 4 2020
LAZ001-010-TXZ138-151-153-050000-
De Soto LA-Caddo LA-Panola TX-Harrison TX-Shelby TX-
619 PM CDT Fri Sep 4 2020
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN DE SOTO AND
SOUTHWESTERN CADDO PARISHES...SOUTHEASTERN HARRISON...PANOLA AND
NORTHEASTERN SHELBY COUNTIES UNTIL 700 PM CDT...
At 618 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Greenwood to 12 miles southeast of Deberry
to 13 miles northeast of Tenaha to near Joaquin to near Logansport.
Movement was west at 15 mph.
Winds in excess of 40 mph will be possible with these storms.
Locations impacted include...
Shreveport, Marshall, Carthage, Greenwood, Waskom, Logansport,
Tenaha, Joaquin, Deberry, Elysian Fields, Scottsville, Gary City,
Front, Spring Ridge, Cross Lake, Leigh, Jonesville, Midyett, Deadwood
and Woods.
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.
&&
LAT...LON 3264 9425 3225 9442 3213 9442 3210 9441
3189 9427 3188 9392 3199 9397 3203 9398
3214 9398 3252 9385
TIME...MOT...LOC 2318Z 106DEG 15KT 3250 9392 3216 9404 3205 9405 3202
9404 3192 9398
20The Shreveport radar (KSHV), 79 km away, was scanning. The volume nearest the first event began at 01:15 UTC.
2 thunderstorm wind. Local standard time, as filed.
Numerous trees were downed on FM 414 just north of Highway 87. Other trees were downed nearby on County Road 2033 off of Highway 87.
Numerous trees were blown down off of Highway 96 about 3 miles south of Loop 500. A barn was blown away, and a hay-ring from an unknown location was blown onto the property of a homeowner.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2020Every state in 2020This day in weather historyWarnings in Texas, September 2020
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: 911521, 911522.