During the early morning hours of November 12th, a deep upper trough was located across the Inter-Mountain West into the Great Plains and this feature was able to tap a vigorous plume of moisture from the Eastern Pacific and the Gulf of Mexico into the Four State Region. A surface frontal boundary had pushed well south of the area and was located near or along the Southeast Texas, Southern…
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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.
During the early morning hours of November 12th, a deep upper trough was located across the Inter-Mountain West into the Great Plains and this feature was able to tap a vigorous plume of moisture from the Eastern Pacific and the Gulf of Mexico into the Four State Region. A surface frontal boundary had pushed well south of the area and was located near or along the Southeast Texas, Southern Louisiana Gulf Coast. Just above the surface near the 5000 foot level, an elevated boundary was pushed northward during the overnight hours of the 11th and into the morning hours of the 12th. Isentropic lift became maximized along and just to the north of this elevated boundary such that portions of East Texas and Northern Louisiana near the Interstate 20 corridor saw training bands of thunderstorms, some of which produced excessive heavy rainfall which resulted in flooding. Widespread rainfall amounts of three to six inches of rain fell across these areas, atop already saturated grounds from above normal rainfall that fell since the first week of September. This resulted in numerous roads to become flooded and closed.
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 Nov 12, 12:00 AM CST, 4 hours 33 minutes earlier.
Area Forecast Discussion National Weather Service Shreveport LA 1200 AM CST Mon Nov 12 2018 .AVIATION... For the 12/06Z TAF period, ceilings continue to deteriorate as widespread shwrs and isolated tstms expand northward overnight. Look for IFR/LIFR ceilings and vsbys to overtake all sites during the early morning hours as rainfall intensity further increases. Poor flight conditions will prevail through the remainder of the period on Monday as a strong cold front sweeps across the region. E/NE winds tonight will shift N/NW with fropa on Monday as speeds increase to around 15 kts with higher gusts as high as 25-30 kts from late Monday morning through Monday afternoon. Convection will begin to slowly end from west to east late Monday through Monday night as the cold front clears the region. /19/ && .PREV DISCUSSION... /issued 1012 PM CST Sun Nov 11 2018/ UPDATE... Moisture continues to surge northeast across our region ahead of a sfc low tracking up along the Texas coast this evening. The result is widespread shwrs and a few embedded tstms lifting northeastward across the Four-State region. This trend will continue overnight as further enhancement of convection is aided by a deep upper level trough swinging out across the Plains accompanied by a strong cold front. For the update this evening, did make some adjustments to temperatures to better reflect ongoing observations and expected trends over the next several hours. Otherwise, no other changes are needed at this time. All updated text products have been sent. /19/ && .PRELIMINARY POINT TEMPS/POPS... SHV 44 44 36 46 / 100 100 30 10 MLU 45 47 38 46 / 100 100 50 10 DEQ 40 40 28 40 / 100 100 20 0 TXK 41 41 32 43 / 100 100 20 10 ELD 41 42 33 44 / 100 100 30 10 TYR 44 44 30 43 / 100 100 20 10 GGG 43 43 33 44 / 100 100 20 10 LFK 46 50 36 46 / 100 100 30 10 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...None. LA...None. OK...None. TX...None. && 19
Hazardous Weather Outlook National Weather Service Shreveport LA 1147 AM CST Sun Nov 11 2018 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-121800- 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- 1147 AM CST Sun Nov 11 2018 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... Scattered showers across mainly the southern half of the Four State Region will become more widespread overnight, along with a few thunderstorms possible. Rainfall amounts along and south of the Interstate 20 corridor could total between one and two inches through sunrise Monday Morning with lighter amounts north of the corridor. Otherwise, no hazardous weather is anticipated through tonight. .DAYS TWO THROUGH SEVEN...Monday through Saturday... Rain will continue to be widespread across the entire Four State Region on Monday before tapering off from northwest to southeast Monday Night. An additional one half to over one inch of rain possible Monday through Monday evening. Colder air will penetrate the region Monday Night and a quick transition to some light snow or snow flurries cannot be ruled out across portions of the Middle Red River Valley of extreme Northeast Texas, Southeast Oklahoma and the adjacent counties in Southwest Arkansas Monday Evening before the precipitation comes to an end. No accumulation is expected at this time. .SPOTTER INFORMATION STATEMENT... Activation of emergency management personnel...amateur radio operators...and storm spotters will not be needed this afternoon or tonight. 07
The Shreveport radar (KSHV), 9 km away, was scanning. The volume nearest the first event began at 10:31 UTC.
6 flash flood. Local standard time, as filed.
High water forced the closure of Linwood Avenue between Flournoy Lucas Road and Bert Kouns Industrial Loop. The Shreveport Police Department was directing traffic.
High water was reported on Dudley Drive and Highland Avenue in East Shreveport.
The southbound lane of Mansfield Road at Barron Road at the Union Pacific Railroad overpass was flooded and closed.
High water was over Wallace Lake Road south of Flournoy Lucas Road.
High water resulted in a road closure at West 70th Street and Highway 3132 (Terry Bradshaw Passway).
High water was reported on Providence Road near Greenwood-Springridge Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2018Every state in 2018This day in weather historyWarnings in Louisiana, November 2018
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 2026-10-01. Each event’s entry at NCEI: 785448, 785452, 785457, 785459, 785460, 785462.