Hot temperatures and humidity combined to lead to a period of oppressive heat on the 9th through the 13th, with heat advisories issued for much of central and western Oklahoma.
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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.
Hot temperatures and humidity combined to lead to a period of oppressive heat on the 9th through the 13th, with heat advisories issued for much of central and western Oklahoma.
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 Jun 9, 11:54 AM CST, 6 minutes earlier.
Area Forecast Discussion National Weather Service Norman OK 1254 PM CDT Wed Jun 9 2021 ...New AVIATION, UPPER AIR... .SHORT TERM... (Today and tonight) Issued at 526 AM CDT Wed Jun 9 2021 Low level temperatures warm significantly today. The very high dewpoints will keep temperatures themselves in check but heat index values will rise into the mid-upper 90s east and 100-110 central and west. A dryline will set up in the Oklahoma and Texas panhandles today. As the SPC outlook indicates, there could be enough of a dryline circulation to get isolated thunderstorms to develop. Right now, the dryline looks to set up far enough west of the 100th meridian that any storms that might develop will likely remain west of the area, and do not see enough of a signal to include 20 POPs in the west. We will have some low chances of storms in north central Oklahoma this evening as there is some low potential of storms in eastern Oklahoma to build northwest into north central Oklahoma and the GFS, ECMWF and Canadian all have some QPF signal here. && .LONG TERM... (Thursday through Tuesday) Issued at 321 AM CDT Wed Jun 9 2021 Hot and muggy conditions continue as the mid-level ridge dominates the synoptic pattern for our region. Daytime highs will become increasingly hotter Thursday and then Friday, though have modified NBM output with CONSMOS for both days given the amount of moisture present. Widespread heat indices of 100 to 105 F are expected with a small area across southwest OK and north TX near 110 F. With HI borderline for Heat Advisory criteria, will hold off on advisory issuance for now. Will have to pay attention to thunderstorm chances for Thursday afternoon/evening as forecast soundings indicate extreme instability ahead of the dryline as it moves into western Oklahoma. It appears there may be a small window of time where CIN diminishes substantially over a portion of western Oklahoma. With warm air aloft and the mid-level ridge in place, however, mid-level subsidence may negate any updraft attempts. A cold front pushes into northern Oklahoma and stalls over north/west Oklahoma on Friday. The evolution of the front from that point is unclear, and indications are that the boundary may gradually wash out on Saturday. Regardless, hot conditions continue over the weekend, with temperatures trending downward towards climatology next week. Relief from 70 degree dewpoints does not appear to occur for much of central and eastern Oklahoma until early next week. A few rounds of nocturnal MCSs may still impact the area (beginning Saturday night and into early next week). There is still significant model disparity, and so POPs remain low for now. Thompson && .AVIATION... (18Z TAFS) Issued at 1249 PM CDT Wed Jun 9 2021 A few patches of clouds with ceilings at 1,000 to 1,500 feet remain over parts of Oklahoma at midday. These clouds should thin and become scattered, with bases rising to around 3,000 feet. Many areas will become clear this afternoon. Cloud redevelopment appearslikely tonight, though timing and location are problematic. Bases may be lower than what is in the TAFs around sunrise. Later forecasts will refine the timing/heights, though ceilings will likely be quite variable, owing to the blotchy nature of the cloud cover. CmS && .UPPER AIR... Issued at 1249 PM CDT Wed Jun 9 2021 No Upper Air flights are currently planned. && .PRELIMINARY POINT TEMPS/POPS... Oklahoma City OK 91 74 92 74 / 10 10 0 0 Hobart OK 97 73 99 74 / 0 0 0 0 Wichita Falls TX 95 75 96 74 / 0 0 0 0 Gage OK 96 70 99 72 / 0 0 0 0 Ponca City OK 89 72 93 74 / 10 0 20 10 Durant OK 89 74 91 73 / 10 10 0 0 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...None. TX...None. && SHORT TERM...26 LONG TERM....01 AVIATION...23
Hazardous Weather Outlook National Weather Service Norman OK 427 AM CDT Wed Jun 9 2021 OKZ004>048-050>052-TXZ083>090-100930- 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- 427 AM CDT Wed Jun 9 2021 This hazardous weather outlook is for portions of northern... western...central...and southern Oklahoma...and western north Texas. .DAY ONE...Today and Tonight... .Heat Index... Heat index values this afternoon will reach the triple digits across western and central Oklahoma and western north Texas, and the mid to upper 90s across the east. .Thunderstorms... There is a slight chance of thunderstorms across north central Oklahoma this evening, but severe weather is not expected. Farther west, a dryline will develop in the Oklahoma and Texas panhandles. Isolated thunderstorms may develop near the dryline this afternoon, but if storms do develop, they will most likely remain in the panhandles. There would be a marginal risk of severe thunderstorms in far western Oklahoma and far western sections of north Texas if thunderstorms do move farther east than expected, but this appears unlikely. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday... .Heat Index... Heat index values will reach 99 to 110 again on Thursday afternoon. .Thunderstorms... There are low chances of thunderstorms Friday night through Saturday, Sunday night and again Tuesday across portions of the area. Thunderstorms will not be widespread, and the potential for severe weather is low. Get graphics and more details at weather.gov/norman...and follow our weather forecast office on Twitter and Facebook.
The national radar mosaic for the moment the first event began.
1 heat. Local standard time, as filed.
More than 75 heat-related emergency calls were received in the OKC area during this stretch of hot weather.
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: 969473.