Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 20, NWS Tulsa, OK

May 27, 20215 counties in Oklahoma

NWS Tulsa, OK issued this flash flood warning at May 27, 2021, 4:18 PM CDT for 5 counties in Oklahoma. It was in force for 3 hr. 8 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 27, 2021, 4:18 PM CDT (21:18 UTC)
Expired: May 27, 2021, 7:30 PM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Osage County, OK, Pawnee County, OK, Rogers County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 38 km from the middle of the area, began a volume at 21:19 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 27, 4:45 PM CDT	FLASH FLOOD	2 Wnw Owasso, OK	WATER OVER THE ROADWAY AT 86TH STREET NORTH AND MEMORIAL.
May 27, 5:01 PM CDT	FLASH FLOOD	4 Sse Sperry, OK	66TH STREET NORTH CLOSED NEAR LEWIS AVE DUE TO HIGH WATER.
May 27, 5:03 PM CDT	FLASH FLOOD	1 Ne Sperry, OK	106TH STREET NORTH CLOSED BETWEEN BETWEEN LEWIS AND CINCINNATI NEAR BIRD CREEK.
May 27, 5:05 PM CDT	FLASH FLOOD	Collinsville, OK	FLOODING REPORTED AT 5TH AND BROADWAY.
May 27, 5:21 PM CDT	FLASH FLOOD	3 S Collinsville, OK	FLASH FLOODING AT 116TH STREET NORTH AND GARNETT. VIA TWITTER.
May 27, 5:45 PM CDT	FLASH FLOOD	3 Ene Owasso, OK	ROAD CLOSED DUE TO ROADWAY BEING WASHED AWAY AT 96TH STREET NORTH AND 147TH EAST AVENUE. RELAYED ON TWITTER.
May 27, 6:12 PM CDT	FLASH FLOOD	3 Ene Owasso, OK	OFF DUTY NWS EMPLOYEE REPORTS ROAD CLOSED DUE TO ROAD WASHING AWAY.
May 27, 6:22 PM CDT	FLASH FLOOD	4 Ne Owasso, OK	VIDEO RELAYED VIA SOCIAL MEDIA OF ROAD CLOSURE AND CAR STALLED AT 106TH N AND 145TH E IN OWASSO.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 9.3 hours before the alert went out and 182 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 295 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 964 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 160 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

860 
WGUS54 KTSA 272118
FFWTSA
OKC113-117-131-143-147-280030-
/O.NEW.KTSA.FF.W.0020.210527T2118Z-210528T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
418 PM CDT Thu May 27 2021

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Southeastern Osage County in northeastern Oklahoma...
  Eastern Pawnee County in northeastern Oklahoma...
  Rogers County in northeastern Oklahoma...
  Northeastern Tulsa County in northeastern Oklahoma...
  Southern Washington OK County in northeastern Oklahoma...

* Until 730 PM CDT.

* At 418 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar indicated.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Tulsa...                           Claremore...
  Owasso...                          Skiatook...
  Catoosa...                         Collinsville...
  Verdigris...                       Chelsea...
  Sperry...                          Oologah...
  Ramona...                          Foyil...
  Avant...                           Westport...
  Talala...                          Vera...
  Turley...                          Tulsa International Airport...
  Tiawah...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3651 9629 3661 9581 3660 9581 3659 9543
      3651 9543 3651 9544 3650 9544 3622 9544
      3618 9638

FLASH FLOOD...RADAR INDICATED

$$

RJS

2 follow-up statements

591 
WGUS74 KTSA 272211
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
511 PM CDT Thu May 27 2021

OKC113-117-131-143-147-280030-
/O.CON.KTSA.FF.W.0020.000000T0000Z-210528T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Osage OK-Pawnee OK-Rogers OK-Tulsa OK-Washington OK-
511 PM CDT Thu May 27 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 PM CDT THIS 
EVENING FOR SOUTHEASTERN OSAGE, EASTERN PAWNEE, ROGERS, NORTHEASTERN 
TULSA AND SOUTHERN WASHINGTON OK COUNTIES...

At 511 PM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 4 inches of rain have 
fallen. Numerous reports of flash flooding have been reported in the 
Owasso and Collinsville areas.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Radar indicated.

IMPACT...Flooding of small creeks and streams, urban areas,
         highways, streets and underpasses as well as other
         drainage and low lying areas.

Some locations that will experience flash flooding include...
  Tulsa...                           Claremore...
Owasso...                          Skiatook...
Catoosa...                         Collinsville...
Verdigris...                       Chelsea...
Sperry...                          Oologah...
Ramona...                          Foyil...
Avant...                           Westport...
Talala...                          Vera...
Turley...                          Tulsa International Airport...
Tiawah...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 3651 9629 3661 9581 3660 9581 3659 9543
      3651 9543 3651 9544 3650 9544 3622 9544
      3618 9638

FLASH FLOOD...RADAR INDICATED

$$

RJS

570 
WGUS74 KTSA 280034
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
734 PM CDT Thu May 27 2021

OKC113-117-131-143-147-280044-
/O.EXP.KTSA.FF.W.0020.000000T0000Z-210528T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Osage OK-Pawnee OK-Rogers OK-Tulsa OK-Washington OK-
734 PM CDT Thu May 27 2021

...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHEASTERN OSAGE, EASTERN 
PAWNEE, ROGERS, NORTHEASTERN TULSA AND SOUTHERN WASHINGTON OK 
COUNTIES...

The heavy rain has ended. However, flooding will continue. 
Therefore, a flood warning has replaced the Flash Flood Warning.

A Flash Flood Watch remains in effect until 100 AM CDT for portions 
of Arkansas and Oklahoma.

LAT...LON 3651 9629 3661 9581 3660 9581 3659 9543
      3651 9543 3651 9544 3650 9544 3622 9544
      3618 9638

$$

RJS

The office that day

Everything else NWS Tulsa, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 9:08 AM CDT	River Flood Warning	TSA	Ottawa	29 hr
May 27, 9:58 AM CDT	River Flood Advisory	TSA	Cherokee	4 days
May 27, 10:46 AM CDT	Flash Flood Watch	TSA	Adair, Cherokee, Craig, Creek, Delaware, McIntosh and 11 more	11 hr
May 27, 11:31 AM CDT	Areal Flood Advisory	TSA	Ottawa	3 hr
May 27, 12:30 PM CDT	Special Weather Statement	TSA	Washington	45 min
May 27, 12:41 PM CDT	Special Weather Statement	TSA	Ottawa	34 min
May 27, 12:46 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Ottawa	44 min
May 27, 12:57 PM CDT	Severe Thunderstorm Warning	TSA	Osage	27 min
May 27, 1:12 PM CDT	Special Weather Statement	TSA	Nowata, Washington	63 min
May 27, 1:26 PM CDT	Special Weather Statement	TSA	Osage	34 min
May 27, 1:29 PM CDT	Special Weather Statement	TSA	Ottawa	46 min
May 27, 1:30 PM CDT	Flash Flood Warning	TSA	Ottawa	6 hr
May 27, 1:35 PM CDT	Areal Flood Advisory	TSA	Craig, Nowata	2 hr
May 27, 1:40 PM CDT	Areal Flood Advisory	TSA	Osage, Pawnee	3 hr
May 27, 1:55 PM CDT	Special Weather Statement	TSA	Osage	65 min
May 27, 2:36 PM CDT	Areal Flood Advisory	TSA	Osage, Washington	92 min
May 27, 2:37 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Osage, Rogers, Washington	53 min
May 27, 2:54 PM CDT	River Flood Warning	TSA	Cherokee	5 hr
May 27, 2:54 PM CDT	River Flood Advisory	TSA	Cherokee, Delaware	22 hr
May 27, 2:54 PM CDT	River Flood Advisory	TSA	Adair, Cherokee, Delaware	35 hr
May 27, 3:08 PM CDT	Severe Thunderstorm Warning	TSA	Rogers, Tulsa, Washington	52 min
May 27, 3:15 PM CDT	Special Weather Statement	TSA	Osage	45 min
May 27, 3:18 PM CDT	Severe Thunderstorm Warning	TSA	Creek	57 min
May 27, 3:23 PM CDT	Severe Thunderstorm Warning	TSA	Osage	37 min
May 27, 3:27 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Nowata, Rogers	63 min
May 27, 3:42 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	48 min
May 27, 3:49 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Mayes, Nowata, Osage, Pawnee, Rogers and 2 more	56 min
May 27, 3:51 PM CDT	Flash Flood Warning	TSA	Craig, Nowata	3 hr
May 27, 4:08 PM CDT	Flash Flood Warning	TSA	Osage, Washington	3 hr
May 27, 4:15 PM CDT	Special Weather Statement	TSA	Okmulgee	30 min
May 27, 4:26 PM CDT	Special Weather Statement	TSA	Tulsa, Wagoner	34 min
May 27, 4:34 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Delaware, Mayes, Ottawa	56 min
May 27, 4:42 PM CDT	Areal Flood Advisory	TSA	Creek, Okmulgee, Rogers, Tulsa, Wagoner	3 hr
May 27, 4:46 PM CDT	Special Weather Statement	TSA	Delaware, Mayes	59 min
May 27, 4:51 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	39 min
May 27, 4:59 PM CDT	Flash Flood Warning	TSA	Craig, Delaware, Mayes, Rogers	3 hr
May 27, 5:07 PM CDT	Special Weather Statement	TSA	Wagoner	38 min
May 27, 5:26 PM CDT	Special Weather Statement	TSA	Delaware	34 min
May 27, 5:26 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	64 min
May 27, 5:39 PM CDT	Severe Thunderstorm Warning	TSA	Cherokee, Muskogee, Wagoner	51 min
May 27, 5:47 PM CDT	Special Weather Statement	TSA	Okmulgee	43 min
May 27, 6:06 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	39 min
May 27, 6:07 PM CDT	Flash Flood Warning	TSA	Creek, Okfuskee, Okmulgee	3 hr
May 27, 6:10 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	50 min
May 27, 6:26 PM CDT	Flash Flood Warning	TSA	Adair, Cherokee, Muskogee, Okmulgee, Wagoner	2 hr
May 27, 6:34 PM CDT	Special Weather Statement	TSA	Cherokee	41 min
May 27, 6:35 PM CDT	Areal Flood Warning	TSA	Craig, Nowata	12 hr
May 27, 6:35 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee, Okmulgee	40 min
May 27, 6:51 PM CDT	Areal Flood Warning	TSA	Osage, Washington	12 hr
May 27, 6:51 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Muskogee, Okmulgee	39 min
May 27, 6:59 PM CDT	Severe Thunderstorm Warning	TSA	McIntosh, Okfuskee, Okmulgee, Pittsburg	46 min

Nearby

Flash Flood Warnings in Oklahoma, 2021 Every flash flood warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.