A broad low pressure center in the middle and upper atmosphere moved from northern Texas to northeastern Oklahoma on the 6th and 7th. The first round of thunderstorms affected southeastern Oklahoma during the morning and afternoon hours of the 6th.
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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 TSA wrote it up.
A broad low pressure center in the middle and upper atmosphere moved from northern Texas to northeastern Oklahoma on the 6th and 7th. The first round of thunderstorms affected southeastern Oklahoma during the morning and afternoon hours of the 6th. Locally heavy rainfall occurred, which resulted in isolated flash flooding.
A more pronounced and focused area of thunderstorms developed during the early morning hours of the 7th across northeastern Oklahoma. The storms were slow-moving, and very efficient rain producers due to high amounts of moisture in the air. A swath of heavy rain occurred across portions of McIntosh, Okfuskee, Okmulgee, Tulsa, and Pawnee Counties, where widespread two to eight inch amounts occurred. Personal weather stations in Okmulgee County measured over thirteen inches of rain in a several hour period, with rainfall rates as much as six and a half inches per hour. Widespread flash flooding occurred as a result of this heavy rainfall.
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 Tulsa, OK wrote its last area forecast discussion before the first event at Jun 6, 11:20 AM CST, 1 hour 12 minutes earlier.
Area Forecast Discussion National Weather Service Tulsa OK 1220 PM CDT Sun Jun 6 2021 .AVIATION... CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG. Chances for rain and isolated thunder will continue through the period at all sites. Cigs will fluctuate between VFR/MVFR, with MVFR cigs/vsbys expected in rain and thunder. && .PREV DISCUSSION... /Issued 1053 AM CDT Sun Jun 6 2021/ DISCUSSION... Broad upper level circulation over central OK as of late morning, and will contribute additional shower and isolated/scattered thunderstorm development through the afternoon. Current PoPs for the afternoon look good, with higher chances south and east as terrain will enhance areal coverage some. Afternoon temperatures are expected to rival those observed yesterday, so will leave those as they are. Remaining first period elements look good as well so no update is planned at this time. PREV DISCUSSION... /Issued 646 AM CDT Sun Jun 6 2021/ AVIATION... CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG. Scattered areas of light to moderate rain will continue to spread across eastern Oklahoma and northwest Arkansas today in response to approaching upper low with a continued chance for a few embedded thunderstorms. Ceilings heights/visibilities will likely be highly variable depending on timing of the heavier rain/storms. PREV DISCUSSION... /Issued 356 AM CDT Sun Jun 6 2021/ DISCUSSION... Broad and weak upper level low centered on north central Texas this morning will continue its very slow trek to the north and northeast over the next few days. Several embedded vort maxes continue to rotate around the center and will aid in increasing shower and thunderstorm coverage both today and Monday. Actually pinning down the timing and location of heaviest rainfall will remain problematic but in general the highest POPs will be maintained across western AR and adjacent areas of eastern OK. While severe weather threat remains very low, pockets of heavy rainfall are likely in this pattern given the anomalously high moisture content through a deep layer and anticipated slow storm movement with weak steering flow. As we move toward mid week the low will be centered more to our northeast with weak northwest flow developing on the southern flank of the low. With unstable airmass residing over the area, thunderstorm chances will continue Tue/Wed with at least limited potential for a storm complex or two affecting the forecast area. The overall trend though would appear for decreasing chances by mid week. Upper ridge becomes more prominent late next week with drier and hotter conditions developing, with first real shot at 90 degree plus temps in some areas with continued high humidity. A bit more uncertainty shows up by next weekend regarding a potential weak frontal boundary moving into the southern plains with the upper air pattern becoming increasingly amplified. && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && AVIATION.....23
Hazardous Weather Outlook National Weather Service Tulsa OK 1241 PM CDT Sun Jun 6 2021 ARZ001-002-010-011-019-020-029-OKZ049-053>076-071000- Adair OK-Benton AR-Carroll AR-Cherokee OK-Choctaw OK-Craig OK- Crawford AR-Creek OK-Delaware OK-Franklin AR-Haskell OK-Latimer OK- Le Flore OK-Madison AR-Mayes OK-McIntosh OK-Muskogee OK-Nowata OK- Okfuskee OK-Okmulgee OK-Osage OK-Ottawa OK-Pawnee OK-Pittsburg OK- Pushmataha OK-Rogers OK-Sebastian AR-Sequoyah OK-Tulsa OK-Wagoner OK- Washington OK-Washington AR- 1241 PM CDT Sun Jun 6 2021 This Outlook is for Northwest and West Central Arkansas as well as much of Eastern Oklahoma. .DAY ONE...This Afternoon and Tonight. THUNDERSTORMS WITH DANGEROUS LIGHTNING. RISK...Elevated. AREA...Eastern Oklahoma and Western Arkansas. ONSET...Ongoing. HEAVY RAIN. RISK...Limited. AREA...Mainly Southeast Oklahoma and Western Arkansas. ONSET...Ongoing. DISCUSSION... Showers and scattered thunderstorms will persist this afternoon and into tonight, with the greatest coverage expected across western Arkansas and far eastern Oklahoma. Slower movement of storms will produce locally heavy rainfall which may result in minor flooding. Severe weather through tonight is unlikely. SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT... Local Spotter Activation May Be Needed. .DAYS TWO THROUGH SEVEN...Monday through Saturday. MONDAY...Thunderstorm Potential...Heavy Rain Potential. TUESDAY through SATURDAY...Thunderstorm Potential. EXTENDED DISCUSSION... Thunderstorm chances will continue into next week, with greatest coverage across western Arkansas and far eastern Oklahoma. Areas of heavy rainfall will be possible with slow moving storms, with the greatest potential for heavy rain being across western Arkansas and far southeast Oklahoma Monday. A few strong storms may occur but the threat of organized severe weather will remain low. The overall coverage of storms should decrease later in the week. weather.gov/tulsa contains additional information.
The Western Arkansas radar (KSRX), 81 km away, was scanning. The volume nearest the first event began at 18:29 UTC.
8 flash flood. Local standard time, as filed.
Portions of several roads were reported flooded. A couple vehicles were stranded in the flood water.
Portions of several roads were flooded in and around town, including Highway 75 near 13th Street.
Portions of numerous county roads were flooded. Some roads had sections that were washed out by flood waters.
Several roads were reported flooded, including eastbound portions of I-44 between Highway 75 and I-244.
Portions of Highway 150 were washed out by flood water.
Portions of several county roads were flooded and closed.
Flood waters affected eleven homes. Multiple swift water rescues were conducted.
Several county roads were reported flooded. Portions of Cimmaron Ranch Road were washed out.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oklahoma in 2021Every state in 2021This day in weather historyWarnings in Oklahoma, June 2021
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: 964633, 964762, 964770, 964764, 964769, 964766, 964768, 964767.