Numerous unorganized showers and storms formed under the influence of southwest flow on the afternoon of the 6th. Heavy rain and training storms resulted in some flash flooding.
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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 OUN wrote it up.
Numerous unorganized showers and storms formed under the influence of southwest flow on the afternoon of the 6th. Heavy rain and training storms resulted in some flash flooding.
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 Norman, OK wrote its last area forecast discussion before the first event at Sep 6, 1:58 PM CST, 2 hours 37 minutes earlier.
Area Forecast Discussion
National Weather Service Norman OK
258 PM CDT Thu Sep 6 2018
.DISCUSSION...
Localized flooding/flash flooding from heavy rain showers continues
to be the focus.
Conditions are similar today to the previous few days, with
anomalous moisture (i.e., ~2.00 inches or just above at Norman and
Lamont 12 UTC soundings). Modest destabilization has resulted in
scattered to numerous heavy rain showers and a few thunderstorms.
The radar presentation matches the thermal/moisture profile with
low echo centroid and modest reflectivity values aloft. Radars
remain in Tropical Z-R to account for the anomalously moist
tropical environment and estimates along with gauge measurements
indicate two to three inches an hour with the more mature
convective cells.
We waited until the mesoscale picture became a little more clear to
issue the Flood Watch so we could keep it confined to a more focused
area, sacrificing some lead time some but providing a more
accurate picture with less false alarm area. There is a zone of
weak convergence from western north Texas through southwest
Oklahoma northeastward along the I-44 corridor. Activity should
decrease in coverage this evening and the Flood Watch goes until
0300 UTC / 10:00pm. Like previous days, there isn't much large
scale forcing, but subtle difficult to resolve perturbations aloft
and/or small scale low level convergence will keep some
convection going into the night, probably most likely near the Red
River and across north Texas.
Similar conditions are expected tomorrow, and we have mid range
chance to low likely category precipitation probabilities with
highest chances across the southeastern third of our forecast area.
This is aligned with a band of anomalous precipitable water values
and ahead of a sharpening shortwave trough that could provide enough
forcing for increased coverage. We are still quite moist with low
LCLs and deep warm cloud layers so these will continue to be
efficient rainfall producers and localized flooding/flash flooding
will again be possible.
This shortwave will shift the remnants of Gordon away from our area
Saturday. It will move as far west as Ozarks and should enhance
northeasterly flow some (~15 mph sustained across much of the area)
Friday through Saturday. Rain chances should decrease Saturday as
lower theta-e air mass moves in and precipitable water values fall.
From Sunday onward, mid-level heights rise and a drier/warmer
pattern will develop.
BRB
&&
.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK 80 69 79 68 / 60 50 50 40
Hobart OK 80 67 81 67 / 60 50 50 40
Wichita Falls TX 82 72 81 70 / 70 60 60 50
Gage OK 76 64 76 62 / 40 30 40 30
Ponca City OK 78 69 78 67 / 50 40 60 40
Durant OK 89 71 87 71 / 50 30 60 50
&&
.OUN WATCHES/WARNINGS/ADVISORIES...
OK...Flood Watch until 10 PM CDT this evening for OKZ018-019-023>025-
027>029-037>041-044>046-050.
TX...Flood Watch until 10 PM CDT this evening for TXZ086-089-090.
&&
26/12Hazardous Weather Outlook...UPDATED National Weather Service Norman OK 1217 PM CDT Thu Sep 6 2018 OKZ004>048-050>052-TXZ083>090-071730- Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield- Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne- Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain- Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson- Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton- Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman- Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay- 1217 PM CDT Thu Sep 6 2018 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Through Tonight... .Thunderstorms... Isolated to scattered thunderstorms are likely today into tonight. Severe storms are not expected. .Heavy Rain and Flooding... Locally heavy rainfall amounts are possible with heavy rain showers and thunderstorms. Excessive rainfall may lead to flooding or flash flooding. .DAYS TWO THROUGH SEVEN...Friday through Wednesday... .Thunderstorms... The chance for thunderstorms will continue across Oklahoma and western north Texas through Saturday. The potential for severe storms will remain low. .Heavy Rain and Flooding... Locally heavy rainfall amounts are possible with showers and thunderstorms. Excessive rainfall may lead to flooding or flash flooding. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
The Norman radar (KTLX), 17 km away, was scanning. The volume nearest the first event began at 22:32 UTC.
1 flash flood. Local standard time, as filed.
Foot deep water at SE 19th street and Meadow Run drive. Numerous additional reports of high water in eastern Moore and southeast Oklahoma City.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oklahoma in 2018Every state in 2018This day in weather historyWarnings in Oklahoma, September 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 2026-09-24. Each event’s entry at NCEI: 786605.