An abnormally deep longwave trough shifted south southeast through the Midwest into Eastern Oklahoma and North Texas by the morning hours of July 31st, with an attendant cool front mixing southeast into Northwest Arkansas, Eastern Oklahoma, and North Texas. Showers and thunderstorms continued to develop along and ahead of this front along the longwave trough axis during the morning of the 31st,…
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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.
An abnormally deep longwave trough shifted south southeast through the Midwest into Eastern Oklahoma and North Texas by the morning hours of July 31st, with an attendant cool front mixing southeast into Northwest Arkansas, Eastern Oklahoma, and North Texas. Showers and thunderstorms continued to develop along and ahead of this front along the longwave trough axis during the morning of the 31st, which organized into a broken line as it moved into a moderately unstable air mass by early afternoon during peak heating. Some of the storms became severe across the southern sections of Northcentral Louisiana, where trees and power lines were downed at various locations in Grant Parish, before exiting and weakening the area during the late afternoon hours.
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 31, 1:57 PM CST, 1 hour 33 minutes earlier.
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</html>The Ft Polk radar (KPOE), 51 km away, was scanning. The volume nearest the first event began at 21:26 UTC.
2 thunderstorm wind. Local standard time, as filed.
Trees and power lines were blown down on Lemoine Cutoff Road near Highway 71 just northeast of Colfax.
A large tree limb was downed onto a power line on Hill Street in Pollock.
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, July 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: 898095, 898096.