A strong upper trough ejected northeast across Eastern Colorado and into the Central Plains during the daytime hours of March 28th, which drove a dryline east into much of East Texas, Southeast Oklahoma, and adjacent sections of Southwest Arkansas during the afternoon, slowly mixing east across the remainder of Southwest Arkansas and North Louisiana during the evening through early morning hours…
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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.
A strong upper trough ejected northeast across Eastern Colorado and into the Central Plains during the daytime hours of March 28th, which drove a dryline east into much of East Texas, Southeast Oklahoma, and adjacent sections of Southwest Arkansas during the afternoon, slowly mixing east across the remainder of Southwest Arkansas and North Louisiana during the evening through early morning hours of the 29th. Ample warm, moist air was readily available ahead of this surface feature, with large scale forcing adequate enough for scattered to numerous showers and thunderstorms developing across the broad warm sector near and ahead of the dryline. However, much of the available instability diminished during the evening with the loss of afternoon heating, but strong wind shear and convergence that persisted along and ahead of the dryline contributed to the development of an isolated severe thunderstorm over Caldwell Parish Louisiana, which produced large hail near Columbia and damaging winds which downed trees near Grayson before these storms exited the region into Northeast Louisiana by mid-evening.
The Ft Polk radar (KPOE), 126 km away, was scanning. The volume nearest the first event began at 00:34 UTC.
1 thunderstorm wind, 1 hail. Local standard time, as filed.
Trees were downed on Billy Cy Road just west of Grayson.
Quarter size hail fell along Highway 165 just north of Columbia.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Louisiana in 2020Every state in 2020This day in weather historyWarnings in Louisiana, March 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 2026-10-01. Each event’s entry at NCEI: 874575, 874576.