Tornado and Flash Flooding in Oklahoma, May 27, 2021

Name: Tornado and Flash Flooding in Oklahoma, May 27, 2021
Start: 2021-05-27T13:55
End: 2021-05-27T22:30
Location: Oklahoma

May 27, 2021 · NWS TSA · 38 events in 13 counties and zones

Where it happened

Every event with a place to put it. Tap one for its entry below.

Tornadoes
Tropical storms and surge
Floods
Wind
Hail
Winter weather
Heat and drought
Cold
Fire, smoke and dust
Marine and coastal
Other

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: $150,000
Crop damage: None recorded
Events: 38

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.

What happened

The episode as NWS TSA wrote it up.

Severe thunderstorms developed across eastern Oklahoma during the afternoon of the 27th, near an outflow boundary from previous storms, and ahead of a cold front. These storms eventually organized into a line and moved through southeastern Oklahoma during the evening. A tornado, large hail up to baseball size, and damaging wind occurred as the storms moved through the area. Some of the thunderstorms moved repeatedly over the same areas, and produced very heavy rainfall rates, which resulted in flash flooding.

What forecasters said that day

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 May 27, 1:14 PM CST, 41 minutes earlier.

Area forecast discussion, May 27, 1:14 PM CST, 41 minutes before

Area Forecast Discussion
National Weather Service Tulsa OK
214 PM CDT Thu May 27 2021

.DISCUSSION...
Widespread strong to severe thunderstorms ongoing are expected to
continue across eastern Oklahoma into the evening hours. It
appears there will be multiple rounds of storms for northeastern
Oklahoma over the next several hours with all hazards possible
including a few tornadoes and some very large hail possible as the
atmosphere becomes even more unstable this afternoon. An outflow
boundary is currently emanating from the convection north of I-44
and is propagating southward toward the I-44 corridor. Where this
boundary sets up later this afternoon will serve as a focus for an
enhanced tornado risk somewhere over northeastern Oklahoma.
Current low level wind fields aren't too supportive of a big
tornado threat, but some localized areas near the boundary will
become more supportive as low level winds back some toward this
evening. One of the driving factors will be storm mode by the
time, as the storms transition to a southeastward advancing MCS
this evening and into the overnight hours. If storms can remain
discrete enough later this afternoon, a localized tornado risk
will exist along and south of the outflow boundary through the
evening hours. Tornadoes will remain possible along the leading
edge of the line as it moves into western Arkansas and far
southeast Oklahoma later this evening and tonight. The flooding
risk will be of concern this afternoon and evening as well as
storms train over the same areas and more storms develop and move
through with the cold front currently moving into northwest
Oklahoma. Anomalously high PWAT values will favor very high
rainfall rates and locally 5-6 inches of rain will be possible
through this evening in some locations.

Past tonight, the front will largely push south of the forecast
area by Friday morning ushering in some cooler and drier
conditions for the holiday weekend. A few showers and storms will
remain possible across far southern Oklahoma throughout the day
Friday, but any severe risk looks like it will stay south of the
Red River Friday afternoon. Surface high pressure will settle into
the area Friday night and Saturday morning. That along with some
clearing skies will allow temperatures to drop into the 40s for
some locations in northeast Oklahoma and northwest Arkansas, with
possibly some mid to even lower 40s possible for some of the
normally cooler sites of northwest Arkansas. The unseasonably cool
airmass will remain in place through the weekend with highs
largely in the lower to mid 70s and dry weather through at least
Sunday across the region. Rain chances return by Monday as another
slow moving trough digs into the Desert Southwest. Most of the
rain should remain to our west on Monday, but better chances
arrive Monday night into Tuesday. Severe potential appears to be
pretty marginal for now for the first part of the week. Shower and
storm chances will continue through the rest of the week, with
some better severe potential returning by next Thursday or so as
better instability returns by then.

Bowlan

&&

.PRELIMINARY POINT TEMPS/POPS...
TUL   82  59  73  52 /  90  90  10  10
FSM   87  66  79  55 /  50 100  10  10
MLC   84  63  76  55 /  30 100  20  20
BVO   81  54  71  46 /  90  60   0   0
FYV   81  57  72  45 /  80 100  10   0
BYV   81  58  70  46 /  80 100  10   0
MKO   83  60  73  52 /  70 100  10  10
MIO   80  55  70  47 /  90  90   0   0
F10   82  60  73  52 /  70 100  10  10
HHW   84  67  80  59 /  10  90  30  20

&&

.TSA WATCHES/WARNINGS/ADVISORIES...
OK...Flash Flood Watch until 1 AM CDT Friday for OKZ054>072.

AR...Flash Flood Watch until 1 AM CDT Friday for ARZ001-002-010-011-
     019-020.

&&

LONG TERM....99

Hazardous weather outlook, May 27, 12:05 PM CST, 1 hour 50 minutes before

Hazardous Weather Outlook
National Weather Service Tulsa OK
105 PM CDT Thu May 27 2021

ARZ001-002-010-011-019-020-029-OKZ049-053>076-281045-
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-
105 PM CDT Thu May 27 2021

...SEVERE STORMS LIKELY THRU TONIGHT...

This Outlook is for Northwest and West Central Arkansas as well as
much of Eastern Oklahoma.

.DAY ONE...This Afternoon and Tonight.
TORNADO.
	RISK...Elevated.
	AREA...East Central, Northeast Oklahoma.
	ONSET...After 2 PM.

SEVERE THUNDERSTORM.
	RISK...Significant.
	AREA...Eastern Oklahoma; Northwest Arkansas.
	ONSET...Ongoing.

 AREA AT GREATEST RISK...Areas along and west of highway 69 and
north of I-40.

FLASH FLOOD.
	RISK...Limited to Elevated.
 	AREA...Areas along north of I-40.
	ONSET...Ongoing.

HEAVY RAIN.
	RISK...Significant.
	AREA...Eastern Oklahoma; Western Arkansas.
	ONSET...Ongoing.

	AREA AT GREATEST RISK...Areas along and north of I-40.

DISCUSSION...

A significant risk of severe weather exists this afternoon into
the early evening across northeast and east central Oklahoma, with
an elevated threat across northwest Arkansas and southeast
Oklahoma tonight. Discrete storms this afternoon into the early
evening will be capable of producing tornadoes, very large hail to
2 inches or greater in diameter, and damaging winds. Any storm
that can interact with any lingering boundaries could potentially
produce a strong tornado. Storms will eventually congeal into a
line or complex and move into western Arkansas and southeast
Oklahoma tonight, with the threat transitioning to damaging winds
to around 70 mph over wider swaths. A low tornado threat would
exist on the leading edge of any bows that can surge east to
northeast. Storms should exit the region around or shortly after
midnight tonight.

Multiple rounds of heavy rain producing thunderstorms are possible
mainly along and north of I-40 thru early evening, and could lead
to some flash flooding. Locally heavy rainfall is also possible
with the storm complex south of I-40 tonight, but the system will
be more progressive by then, limiting the heavy rain potential.
Some main-stem rivers may experience flooding as well as runoff
from this event occurs.

SPOTTER AND EMERGENCY MANAGEMENT ACTION STATEMENT...
Activation of the Regional Spotter Network Expected.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday.
FRIDAY...Thunderstorm Potential.
SATURDAY...No Hazards.
SUNDAY thru TUESDAY...Thunderstorm Potential.
WEDNESDAY...Thunderstorm Potential...Heavy Rain Potential.

EXTENDED DISCUSSION...

Limited thunderstorm potential will exist down near the Red River
on Friday, but the best severe weather potential will be south of
the river in Texas.

Storm chances will return next week, but the potential for
widespread organized severe weather appears low at this point. A
weak storm system could bring some locally heavy rain potential by
midweek next week.

weather.gov/tulsa contains additional information.

Lacy

In the hours before

Special weather statement, May 27, 11:30 AM CST, 2 hours 25 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1230 PM CDT Thu May 27 2021

OKZ054>056-271815-
Osage OK-Nowata OK-Washington OK-
1230 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN OSAGE...NORTHERN
WASHINGTON AND NORTHWESTERN NOWATA COUNTIES UNTIL 115 PM CDT...

At 1229 PM CDT, a strong thunderstorm was located 4 miles southeast
of Chautauqua, moving east at 40 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations in or near the path include...
Copan...                          Wann...
Hulah...                          Wah Sha She State Park...

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3700 9564 3682 9566 3689 9622 3700 9621
TIME...MOT...LOC 1729Z 273DEG 34KT 3698 9611

69

Special weather statement, May 27, 11:41 AM CST, 2 hours 14 minutes before

Special Weather Statement
National Weather Service Tulsa OK
1241 PM CDT Thu May 27 2021

OKZ057-058-063-271815-
Craig OK-Delaware OK-Ottawa OK-
1241 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN CRAIG...NORTHWESTERN
DELAWARE AND SOUTHWESTERN OTTAWA COUNTIES UNTIL 115 PM CDT...

At 1241 PM CDT, a strong thunderstorm was located over Vinita, moving
northeast 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...
Miami...                          Vinita...
Grove...                          Fairland...
Afton...                          Bernice...
Narcissa...                       Bernice State Park...
Ottawa...                         Twin Bridges State Park...

This includes Interstate 44 between mile markers 278 and 307.

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3688 9479 3664 9466 3658 9500 3658 9501
      3657 9501 3654 9519 3667 9528
TIME...MOT...LOC 1741Z 247DEG 25KT 3662 9515

69

Special weather statement, May 27, 12:12 PM CST, 1 hour 43 minutes before

Special Weather Statement
National Weather Service Tulsa OK
112 PM CDT Thu May 27 2021

OKZ055>057-271915-
Craig OK-Nowata OK-Washington OK-
112 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CRAIG...NORTHEASTERN
WASHINGTON AND NOWATA COUNTIES UNTIL 215 PM CDT...

At 111 PM CDT, a strong thunderstorm was located 6 miles east of
Dewey, moving east 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...
Bartlesville...                   Nowata...
South Coffeyville...              Delaware...
Lenapah...                        Wann...
Hollow...                         Centralia...
Centrailia...

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3665 9591 3700 9591 3700 9524 3665 9524
TIME...MOT...LOC 1811Z 264DEG 28KT 3676 9583

69

Special weather statement, May 27, 12:26 PM CST, 1 hour 29 minutes before

Special Weather Statement
National Weather Service Tulsa OK
126 PM CDT Thu May 27 2021

OKZ054-059-271900-
Osage OK-Pawnee OK-
126 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL OSAGE AND NORTH CENTRAL
PAWNEE COUNTIES UNTIL 200 PM CDT...

At 126 PM CDT, a strong thunderstorm was located over Fairfax, moving
east at 35 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations in or near the path include...
Pawhuska...                       Fairfax...
Shidler...                        Wynona...
Ralston...                        Burbank...
Pearsonia...                      Eastern Kaw Lake...
Webb City...                      Pershing...
Nelagoney...                      Apperson...

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3691 9626 3644 9620 3640 9685 3675 9688
      3674 9683 3676 9682 3677 9682 3677 9679
      3678 9679 3678 9675 3682 9675
TIME...MOT...LOC 1826Z 256DEG 30KT 3659 9670

69

Special weather statement, May 27, 12:29 PM CST, 1 hour 26 minutes before

Special Weather Statement
National Weather Service Tulsa OK
129 PM CDT Thu May 27 2021

OKZ057-058-063-271915-
Craig OK-Delaware OK-Ottawa OK-
129 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL CRAIG...NORTHWESTERN
DELAWARE AND OTTAWA COUNTIES UNTIL 215 PM CDT...

At 129 PM CDT, a strong thunderstorm was located 4 miles north of
Bernice State Park, moving northeast at 30 mph.

Wind gusts up to 50 mph will be possible with this storm.

Locations in or near the path include...
Miami...                          Grove...
Fairland...                       Afton...
Bernice...                        Wyandotte...
Narcissa...                       Bernice State Park...
Ottawa...                         Cayuga...
Peoria...                         Twin Bridges State Park...

This includes Interstate 44 between mile markers 291 and 321.

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3662 9462 3661 9505 3682 9504 3698 9462
TIME...MOT...LOC 1829Z 236DEG 25KT 3669 9489

69

Special weather statement, May 27, 12:55 PM CST, 1 hour before

Special Weather Statement
National Weather Service Tulsa OK
155 PM CDT Thu May 27 2021

OKZ054-059-272000-
Osage OK-Pawnee OK-
155 PM CDT Thu May 27 2021

...SIGNIFICANT WEATHER ADVISORY FOR OSAGE AND NORTHWESTERN PAWNEE
COUNTIES UNTIL 300 PM CDT...

At 154 PM CDT, a strong thunderstorm was located 4 miles west of
Pawhuska, moving east at 25 mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations in or near the path include...
Bartlesville...                   Pawhuska...
Fairfax...                        Barnsdall...
Shidler...                        Wynona...
Ralston...                        Avant...
Burbank...                        Foraker...
Bigheart...                       Bartlesville Municipal Airport...
Osage Hills State Park...         Pearsonia...
Hulah...                          Sunset Lake...
Okesa...                          Sooner Lake...
Southern Kaw Lake...              Webb City...

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 Tornado Watch remains in effect until 700 PM CDT for northeastern
Oklahoma.

LAT...LON 3670 9703 3668 9694 3675 9689 3674 9683
      3677 9682 3678 9675 3687 9675 3697 9600
      3650 9600 3634 9703 3651 9703 3651 9701
      3653 9698 3655 9690 3658 9689 3660 9692
      3658 9698 3659 9705 3660 9704 3669 9707
TIME...MOT...LOC 1854Z 250DEG 22KT 3666 9642

69

The radar

The Tulsa radar (KINX), 57 km away, was scanning. The volume nearest the first event began at 19:55 UTC.

Open the radar archive at this moment

Event by event

16 flash flood, 13 thunderstorm wind, 8 hail, 1 tornado. Local standard time, as filed.

Thunderstorm Wind, Osage

When: May 27, 1:55 PM CST
Where: Osage County, Avant
Measured: 56 kt (64 mph) measured gust
Reported by: Trained Spotter
Coordinates: 36.480, -96.070

Thunderstorm wind gusts were measured to 64 mph.

Hail, Washington

When: May 27, 2:07 PM CST
Where: Washington County, Ochelata
Measured: 0.88 in hail
Reported by: Emergency Manager
Coordinates: 36.600, -95.980

Thunderstorm Wind, Washington

When: May 27, 2:15 PM CST
Where: Washington County, Vera
Measured: 61 kt (70 mph) estimated gust
Reported by: Public
Coordinates: 36.450, -95.880

Thunderstorm wind gusts were estimated to 70 mph.

Thunderstorm Wind, Osage

When: May 27, 2:40 PM CST
Where: Osage County, 10 mi ESE of Hominy
Measured: 52 kt (60 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 36.365, -96.234

Thunderstorm wind gusts were estimated to 60 mph.

Flash Flood, Osage

When: May 27, 2:43 PM CST to 6:00 PM CST
Where: Osage County, 1.58 mi E of Pawhuska to 1.51 mi ENE of Pawhuska
Cause: Heavy Rain
Reported by: Public
Coordinates: 36.671, -96.302

Several roads were reported flooded on the east side of Pawhuska.

Flash Flood, Nowata

When: May 27, 2:50 PM CST to 5:45 PM CST
Where: Nowata County, 1 mi SE of Nowata to 0.78 mi SSW of Nowata
Cause: Heavy Rain
Reported by: Public
Coordinates: 36.690, -95.617

Several roads were reported flooded on the southeast side of town.

Thunderstorm Wind, Osage

When: May 27, 3:00 PM CST
Where: Osage County, 4.87 mi S of Skiatook Arpt
Measured: 55 kt (63 mph) measured gust
Reported by: Trained Spotter
Coordinates: 36.280, -96.010

Thunderstorm wind gusts were measured to 63 mph.

Thunderstorm Wind, Tulsa

When: May 27, 3:07 PM CST
Where: Tulsa County, 4 mi SSE of Sperry
Measured: 65 kt (75 mph) estimated gust
Reported by: Trained Spotter
Coordinates: 36.246, -95.972

Strong thunderstorm wind blew down several trees southeast of Sperry.

Flash Flood, Tulsa

When: May 27, 3:45 PM CST to 6:30 PM CST
Where: Tulsa County, 2.15 mi WNW of Owasso to 1.93 mi WNW of Owasso
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 36.282, -95.886

Portions of E 86th Street N were flooded and closed near Memorial Drive.

Flash Flood, Osage

When: May 27, 4:00 PM CST to 6:00 PM CST
Where: Osage County, 1 mi SE of Tallant to 0.64 mi NE of Barnsdall
Cause: Heavy Rain
Reported by: Broadcast Media
Coordinates: 36.590, -96.167

Portions of County Road 2460 were flooded near Highway 11.

Flash Flood, Tulsa

When: May 27, 4:01 PM CST to 6:30 PM CST
Where: Tulsa County, 4 mi SSE of Sperry to 0.12 mi ESE of Turley
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 36.246, -95.972

Portions of E 66th Street N were flooded and closed near Lewis Avenue.

Flash Flood, Tulsa

When: May 27, 4:03 PM CST to 6:30 PM CST
Where: Tulsa County, 1 mi NE of Sperry to 2.42 mi ENE of Sperry
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 36.310, -95.987

Portions of E 106th Street N were flooded and closed, east of N Cincinnati Avenue to east of Bird Creek.

Flash Flood, Tulsa

When: May 27, 4:05 PM CST to 6:30 PM CST
Where: Tulsa County, 0.29 mi S of Collinsville to 0.32 mi S of Collinsville
Cause: Heavy Rain
Reported by: Broadcast Media
Coordinates: 36.366, -95.831

Portions of E 146th Street N were flooded near N 5th Street in Collinsville.

Flash Flood, Tulsa

When: May 27, 4:21 PM CST to 6:30 PM CST
Where: Tulsa County, 3.46 mi N of Owasso to 3.5 mi SSW of Collinsville
Cause: Heavy Rain
Reported by: Social Media
Coordinates: 36.320, -95.845

Portions of E 116th Street N were flooded near N Garnett Road.

Hail, Okfuskee

When: May 27, 4:40 PM CST
Where: Okfuskee County, 7 mi N of Paden
Measured: 2.75 in hail
Property damage: $30,000
Reported by: Emergency Manager
Coordinates: 35.601, -96.570

Baseball size hail damaged homes and vehicles.

Thunderstorm Wind, Okfuskee

When: May 27, 4:44 PM CST
Where: Okfuskee County, 0.39 mi NW of Welty
Measured: 52 kt (60 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 35.624, -96.405

Strong thunderstorm wind snapped large tree limbs.

Flash Flood, Rogers

When: May 27, 4:45 PM CST to 6:30 PM CST
Where: Rogers County, 5.44 mi SSE of Collinsville to 5.4 mi SSE of Collinsville
Cause: Heavy Rain
Property damage: $10,000
Reported by: Social Media
Coordinates: 36.293, -95.811

Portions of E 96th Street N were flooded and closed near N 147th E Avenue. Portions of the roadway were washed away.

Thunderstorm Wind, Wagoner

When: May 27, 4:53 PM CST
Where: Wagoner County, 1.76 mi SW of Okay
Measured: 61 kt (70 mph) estimated gust
Property damage: $5,000
Reported by: Broadcast Media
Coordinates: 35.850, -95.319

Strong thunderstorm wind blew down several power poles.

Flash Flood, Rogers

When: May 27, 5:22 PM CST to 6:30 PM CST
Where: Rogers County, 4.4 mi SSE of Collinsville to 4.49 mi SSE of Collinsville
Cause: Heavy Rain
Property damage: $10,000
Reported by: Social Media
Coordinates: 36.308, -95.813

Portions of E 106th Street N were flooded and closed east of N 145th E Avenue. A vehicle was driven into the flood water and stalled.

Flash Flood, Okfuskee

When: May 27, 5:30 PM CST to 6:15 PM CST
Where: Okfuskee County, 2 mi NNW of Paden to 3.27 mi N of Boley
Cause: Heavy Rain
Property damage: $15,000
Reported by: Emergency Manager
Coordinates: 35.527, -96.584

Portions of a county road and a large tin horn were eroded by flood waters.

Thunderstorm Wind, Okfuskee

When: May 27, 5:37 PM CST
Where: Okfuskee County, 1 mi E of Bearden
Measured: 65 kt (75 mph) estimated gust
Property damage: $5,000
Reported by: Emergency Manager
Coordinates: 35.350, -96.362

Strong thunderstorm wind blew down trees and power poles in and around town.

Thunderstorm Wind, Okfuskee

When: May 27, 5:45 PM CST
Where: Okfuskee County, 7 mi ESE of Bearden
Measured: 61 kt (70 mph) estimated gust
Property damage: $5,000
Reported by: Emergency Manager
Coordinates: 35.311, -96.265

Strong thunderstorm wind blew down a tree and power poles.

Hail, Okmulgee

When: May 27, 5:46 PM CST
Where: Okmulgee County, 3 mi N of Schulter
Measured: 0.75 in hail
Reported by: Public
Coordinates: 35.563, -95.950

Hail, Okfuskee

When: May 27, 5:55 PM CST
Where: Okfuskee County, 0.47 mi WSW of Clearview
Measured: 1 in hail
Reported by: Emergency Manager
Coordinates: 35.397, -96.188

Flash Flood, Okfuskee

When: May 27, 6:00 PM CST to 8:15 PM CST
Where: Okfuskee County, 3 mi SW of Welty to 2.06 mi WSW of Mason
Cause: Heavy Rain
Property damage: $15,000
Reported by: Emergency Manager
Coordinates: 35.589, -96.438

Portions of several county roads were flooded and closed. Flood water eroded portions of these roads, as well as a new tin horn.

Flash Flood, Okmulgee

When: May 27, 6:06 PM CST to 8:30 PM CST
Where: Okmulgee County, 0.4 mi NW of Morris to 1.13 mi WNW of Morris
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 35.604, -95.855

Portions of several roads were flooded in and around Morris.

Flash Flood, Okmulgee

When: May 27, 6:10 PM CST to 8:30 PM CST
Where: Okmulgee County, Okmulgee to 1.66 mi SSW of Okmulgee
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 35.630, -95.970

Numerous roads were flooded in and around Okmulgee.

Hail, Okmulgee

When: May 27, 6:11 PM CST
Where: Okmulgee County, 1 mi SW of Dewar
Measured: 0.75 in hail
Reported by: Public
Coordinates: 35.459, -95.942

Thunderstorm Wind, McIntosh

When: May 27, 6:11 PM CST
Where: McIntosh County, 3.25 mi NE of Bower
Measured: 65 kt (75 mph) estimated gust
Property damage: $5,000
Reported by: NWS Storm Survey
Coordinates: 35.249, -95.884

Strong thunderstorm wind damaged a home.

Tornado, McIntosh

When: May 27, 6:13 PM CST to 6:17 PM CST
Where: McIntosh County, 4.53 mi N of Hanna to 2.41 mi WSW of Raiford
Rating: EF1
Path length: 3 mi
Path width: 500 yd
Property damage: $25,000
Reported by: NWS Storm Survey
Coordinates: 35.265, -95.869

This tornado developed north of Highway 9 and west of Red Hill Road, where large tree limbs were snapped. The tornado moved east-southeast damaging a barn, uprooting a tree, and snapping large tree limbs as it moved along Highway 9. A home was damaged, several trees were uprooted, and a small tree was snapped as the tornado crossed the 4030 Road. It dissipated south of Highway 9 and east of the 4030 Road over open country. Based on this damage, maximum estimated wind in the tornado was 90 to 95 mph.

Thunderstorm Wind, McIntosh

When: May 27, 6:18 PM CST
Where: McIntosh County, 0.56 mi SW of Raiford
Measured: 56 kt (64 mph) estimated gust
Reported by: NWS Storm Survey
Coordinates: 35.264, -95.787

Strong thunderstorm wind snapped large tree limbs.

Thunderstorm Wind, McIntosh

When: May 27, 6:23 PM CST
Where: McIntosh County, 2.68 mi N of Checotah
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 35.468, -95.513

Strong thunderstorm wind blew down several trees just east of Checotah.

Hail, McIntosh

When: May 27, 6:32 PM CST
Where: McIntosh County, 2 mi SE of Eufaula
Measured: 1.75 in hail
Property damage: $25,000
Reported by: Public
Coordinates: 35.260, -95.555

Golf ball size hail damaged vehicles and homes.

Hail, Pittsburg

When: May 27, 6:49 PM CST
Where: Pittsburg County, 2.1 mi NNW of Bowler
Measured: 0.75 in hail
Reported by: Emergency Manager
Coordinates: 35.249, -95.510

Flash Flood, Sequoyah

When: May 27, 7:22 PM CST to 10:30 PM CST
Where: Sequoyah County, 0.49 mi WNW of Vian to 1.72 mi WSW of Vian
Cause: Heavy Rain
Reported by: Law Enforcement
Coordinates: 35.503, -94.978

Portions of several roads in and around Vian were flooded.

Thunderstorm Wind, Latimer

When: May 27, 7:42 PM CST
Where: Latimer County, 0.58 mi NW of Red Oak
Measured: 65 kt (75 mph) estimated gust
Reported by: Emergency Manager
Coordinates: 34.957, -95.086

Strong thunderstorm wind blew down several trees on Boggy Road in Red Oak.

Flash Flood, Sequoyah

When: May 27, 7:58 PM CST to 10:30 PM CST
Where: Sequoyah County, 0.74 mi ESE of Sallisaw to 0.37 mi SE of Sallisaw
Cause: Heavy Rain
Reported by: Emergency Manager
Coordinates: 35.465, -94.788

Portions of W Redwood Avenue were flooded.

Hail, Le Flore

When: May 27, 8:03 PM CST
Where: Le Flore County, 0.83 mi NNW of Whitesboro
Measured: 1 in hail
Reported by: Public
Coordinates: 34.691, -94.885

What these are

Thunderstorm Wind: Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
Hail: Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.
Tornado: A violently rotating column of air in contact with the ground and extending from a thunderstorm, filed with its path, width and Fujita or Enhanced Fujita rating from the damage survey.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Oklahoma in 2021 Every state in 2021 This day in weather history The tornado archive for Oklahoma, 2021 Warnings in Oklahoma, May 2021

Sources

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: 957413, 957417, 957418, 959286, 960794, 960708, 959289, 960675, 960795, 960802, 960796, 960797, 960799, 960806, 960677, 960676, 960807, 959301, 960810, 960829, 960688, 960689, 959305, 960690, 960826, 960814, 960813, 959306, 963468, 958735, 963470, 959308, 959312, 959307, 960815, 959309, 960818, 959310.