Thunderstorms moved southward across eastern Kansas and western Missouri during the day on the 11th, and continued into northeastern Oklahoma during the late evening hours. The strongest storm produced damaging wind gusts.
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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.
Thunderstorms moved southward across eastern Kansas and western Missouri during the day on the 11th, and continued into northeastern Oklahoma during the late evening hours. The strongest storm produced damaging wind gusts.
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 11, 9:11 PM CST, 1 hour 29 minutes earlier.
Area Forecast Discussion National Weather Service Tulsa OK 1011 PM CDT Fri Jun 11 2021 .DISCUSSION... One complex of storms has brushed across the northeast corner of our forecast area this evening as it has been weakening, while a second storm complex develops farther west across south central Kansas. This second complex will propagate south and southwest overnight, possibly brushing the far western parts of our forecast area. Have cancelled the severe thunderstorm watch for all but Osage, Pawnee, and Creek counties as a result. Later tonight, cannot rule out a few showers or storms developing just about anywhere, so will hold onto at least low pops. Other than adjusting pops, the rest of the forecast looks good at this time. Update has already been sent. && .PREV DISCUSSION... /Issued 606 PM CDT Fri Jun 11 2021/ AVIATION... CONCERNING TAF SITES KTUL/KRVS/KBVO/KMLC/KXNA/KFYV/KFSM/KROG. VFR conditions prevail early this evening. However, conditions are expected to worsen late this evening as a thunderstorm complex spreads into the region. MVFR conditions are anticipated by Saturday morning with VFR conditions returning Saturday afternoon. PREV DISCUSSION... /Issued 233 PM CDT Fri Jun 11 2021/ DISCUSSION... Ongoing and well established MCS currently located across NE KS will be the focus through tonight. Much of the 12z guidance did not initialize well with the location of the MCS and higher resolution and short term guidance have largely struggled resolving observed trends. A reservoir of strong instability is in place downstream of the MCS stretching from east central KS through NE OK / NW AR with a corridor of higher low level CAPE extending from NE KS through SW MO / NW AR. Propagation vectors would favor the MCS tracking near this low level instability corridor through the evening with a continued risk of damaging winds. Further west the sfc cold front extends from NE KS through NW OK. The boundary could foster some development southwestward through uncertainty does increase as warm mid level temps and weak forcing will act to suppress all but the strongest of updrafts. The forecast will maintain a north to south gradient in precip chances tonight as cap strength does increase with southward extent and any residual cold pool / outflow boundary will eventually become insufficient to overcome the inhibition. The coverage and duration of the overnight storm complex will impact the forecast into tomorrow. Either the residual outflow and/or the synoptic cold front may remain across the forecast area to support low storm chances, otherwise a warm and humid day is likely. Will defer any potential heat headlines given the aforementioned uncertainty. Strong ridge aloft amplifies and becomes centered over the Inter- mountain west through mid week. The prevailing northerly flow aloft through the central / eastern CONUS will allow several cold fronts to sweep southward and the local region will remain on the periphery of these airmass changes. Overall expect temperatures to remain warm however lower dewpoints are likely to also prevail with persistent sfc ridging along the Gulf Coast. Daily precip chances continue to appear low within this pattern. && .TSA WATCHES/WARNINGS/ADVISORIES... OK...None. AR...None. && SHORT TERM...10 LONG TERM....05 PLATE
Hazardous Weather Outlook National Weather Service Tulsa OK 516 PM CDT Fri Jun 11 2021 ARZ001-002-010-011-019-020-029-OKZ049-053>076-121000- 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- 516 PM CDT Fri Jun 11 2021 ...STRONG TO SEVERE THUNDERSTORMS POSSIBLE TONIGHT... This Outlook is for Northwest and West Central Arkansas as well as much of Eastern Oklahoma. .DAY ONE...Tonight. SEVERE THUNDERSTORM. RISK...Elevated. AREA...Mainly Northeast Oklahoma and Northwest Arkansas. ONSET...This Evening. FLASH FLOOD. RISK...Limited. AREA...Northeast Oklahoma and Northwest Arkansas. ONSET...This Evening. HEAVY RAIN. RISK...Limited. AREA...Northeast Oklahoma and Northwest Arkansas. ONSET...This Evening. DISCUSSION... Showers and thunderstorms currently across eastern Kansas late this afternoon will move south into northeast Oklahoma and northwest Arkansas this evening. A few severe storms are possible and will be capable of producing large hail and damaging wind gusts. Locally heavy rainfall from stronger storms may lead to isolated flooding as well. Storms are expected to weaken by late evening and diminish in areal coverage overnight as they progress southward. SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT... Activation of the Regional Spotter Network Likely. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. SATURDAY...Thunderstorm Potential. SUNDAY through THURSDAY...No Hazards. EXTENDED DISCUSSION... Shower and thunderstorm chances will continue into Saturday, mainly across western Arkansas as a weak frontal boundary moves through the area. Another hot and humid afternoon will be on tap on Saturday for locations ahead of the boundary as well. Slightly drier air will move into the area next week which will help with the dangerous heat index potential, though temperatures are still expected to be near to above normal across the region through most of next week. weather.gov/tulsa contains additional information.
Special Weather Statement
National Weather Service Tulsa OK
814 PM CDT Fri Jun 11 2021
OKZ058-120215-
Ottawa OK-
814 PM CDT Fri Jun 11 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN OTTAWA COUNTY UNTIL 915
PM CDT...
At 810 PM CDT, a strong thunderstorm was located 3 miles east of
Columbus, Kansas, moving east at 35 mph. This storm will likely stay
north and east of Ottawa County, but outflow is expected to surge
south into northern Ottawa County, resulting in up to 40 mph wind
gusts.
Winds in excess of 40 mph will be possible with this storm.
Locations in or near the path include...
Miami... Baxter Springs...
Commerce... Quapaw...
Treece... Picher...
Ottawa... Peoria...
Cardin...
This includes Interstate 44 between mile markers 305 and 324.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Oklahoma.
LAT...LON 3681 9462 3681 9500 3694 9500 3695 9499
3695 9500 3700 9500 3700 9462
TIME...MOT...LOC 0110Z 285DEG 29KT 3718 9479
69Special Weather Statement National Weather Service Tulsa OK 931 PM CDT Fri Jun 11 2021 ARZ002-120330- Carroll AR- 931 PM CDT Fri Jun 11 2021 ...SIGNIFICANT WEATHER ADVISORY FOR CARROLL COUNTY UNTIL 1030 PM CDT... At 931 PM CDT, a strong thunderstorm was located 5 miles southeast of Cassville, moving southeast at 30 mph. Penny size hail and winds in excess of 40 mph will be possible with this storm. Locations in or near the path include... Berryville... Eureka Springs... Green Forest... Beaver... Carrollton... Rudd... Urbanette... Rule... Grandview... Blue Eye... Cabanal... Metalton... Connor... Coin... Pleasant Ridge... Denver... Oak Hill... This storm may intensify, so be certain to monitor local radio stations and available television stations for additional information and possible warnings from the National Weather Service. LAT...LON 3620 9330 3620 9353 3650 9386 3650 9330 TIME...MOT...LOC 0231Z 309DEG 27KT 3661 9380 69
Special Weather Statement
National Weather Service Tulsa OK
1054 PM CDT Fri Jun 11 2021
OKZ054-059-120445-
Osage OK-Pawnee OK-
1054 PM CDT Fri Jun 11 2021
...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN OSAGE AND
NORTHWESTERN PAWNEE COUNTIES UNTIL 1145 PM CDT...
At 1054 PM CDT, a strong thunderstorm was located 6 miles northeast
of Newkirk, moving southeast at 30 mph.
Penny size hail and wind gusts up to 50 mph will be possible with
this storm.
Locations in or near the path include...
Fairfax... Shidler...
Burbank... Sooner Lake...
Southern Kaw Lake... Webb City...
Apperson...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
A Severe Thunderstorm Watch remains in effect until 200 AM CDT for
northeastern Oklahoma.
LAT...LON 3665 9644 3641 9703 3651 9703 3651 9701
3653 9698 3655 9690 3658 9689 3660 9692
3658 9698 3659 9705 3660 9704 3668 9706
3670 9703 3668 9694 3675 9689 3674 9683
3677 9682 3678 9675 3700 9675 3700 9672
TIME...MOT...LOC 0354Z 324DEG 25KT 3692 9694The Vance AFB radar (KVNX), 118 km away, was scanning. The volume nearest the first event began at 04:38 UTC.
1 thunderstorm wind. Local standard time, as filed.
The Oklahoma Mesonet station near Burbank measured 59 mph thunderstorm wind gusts.
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: 964544.