Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 9, NWS Tulsa, OK

April 29, 2021Crawford County, Franklin County, Sebastian County, Arkansas; 6 counties in Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 29, 2021, 12:19 AM CDT for Crawford County, Franklin County, Sebastian County, Arkansas; 6 counties in Oklahoma. It was in force for 6 hr. 1 report 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: Apr 29, 2021, 12:19 AM CDT (05:19 UTC)
Expired: Apr 29, 2021, 6:15 AM CDT
In force: 6 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Crawford County, AR, Franklin County, AR, Sebastian County, AR, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Muskogee County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 20 km from the middle of the area, began a volume at 05:20 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
Apr 29, 6:06 AM CDT	FLASH FLOOD	Alma, AR	ALMA FIRE DEPARTMENT RESPONDED TO AN APARTMENT WHERE RESIDENTS WERE TRAPPED BY FLASH FLOODING. ALL RESCUED WITH NO INJURIES REPORTED. ALSO, ALL LOW WATER CROSSINGS IN THE COUNTY ARE UNDER WATER AT THIS TIME. INFORMATION RELAYED BY COUNTY EM VIA NWSCHAT.

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 00:00Z, 5.3 hours before the alert went out and 205 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: 48 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 320 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

136 
WGUS54 KTSA 290519
FFWTSA
ARC033-047-131-OKC061-077-079-101-121-135-291115-
/O.NEW.KTSA.FF.W.0009.210429T0519Z-210429T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
1219 AM CDT Thu Apr 29 2021

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Southern Crawford County in northwestern Arkansas...
  Southern Franklin County in west central Arkansas...
  Sebastian County in west central Arkansas...
  Southeastern Muskogee County in east central Oklahoma...
  Central Sequoyah County in east central Oklahoma...
  Haskell County in southeastern Oklahoma...
  Latimer County in southeastern Oklahoma...
  Le Flore County in southeastern Oklahoma...
  Pittsburg County in southeastern Oklahoma...

* Until 615 AM CDT.

* At 1219 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing heavy rain across the warned area. Between 
  2 and 5 inches of rain have fallen over the past 12 to 24 hours 
  with local amounts near 6 inches. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar and automated gauges.

  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...
  Fort Smith...                      Van Buren...
  Mcalester...                       Sallisaw...
  Poteau...                          Ozark...
  Wilburton...                       Stigler...
  Charleston...                      Greenwood...
  Alma...                            Barling...
  Pocola...                          Muldrow...
  Heavener...                        Roland...
  Lavaca...                          Spiro...
  Hartshorne...                      Krebs...

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3553 9488 3554 9376 3563 9370 3538 9371
      3543 9381 3531 9381 3532 9392 3522 9392
      3522 9403 3514 9403 3514 9414 3507 9425
      3497 9423 3493 9445 3486 9445 3469 9493
      3468 9551 3459 9551 3468 9609 3504 9609

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

1 follow-up statement

804 
WGUS74 KTSA 290743
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
243 AM CDT Thu Apr 29 2021

ARC033-047-131-OKC061-077-079-101-121-135-291115-
/O.CON.KTSA.FF.W.0009.000000T0000Z-210429T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Crawford AR-Franklin AR-Sebastian AR-Haskell OK-Latimer OK-Le Flore
OK-Muskogee OK-Pittsburg OK-Sequoyah OK-
243 AM CDT Thu Apr 29 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 615 AM CDT THIS 
MORNING FOR SOUTHERN CRAWFORD, SOUTHERN FRANKLIN, SEBASTIAN, 
SOUTHEASTERN MUSKOGEE, CENTRAL SEQUOYAH, HASKELL, LATIMER, LE FLORE 
AND PITTSBURG COUNTIES...

At 243 AM CDT, Doppler radar and automated rain gauges indicated 
thunderstorms producing heavy rain across the warned area. Between 2 
and 5 inches of rain have fallen. Flash flooding is ongoing or 
expected to begin shortly.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Doppler radar and automated gauges.

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...
  Fort Smith...                      Van Buren...
Mcalester...                       Sallisaw...
Poteau...                          Ozark...
Wilburton...                       Stigler...
Charleston...                      Greenwood...
Alma...                            Barling...
Pocola...                          Muldrow...
Heavener...                        Roland...
Lavaca...                          Spiro...
Hartshorne...                      Krebs...

Additional rainfall amounts of 1 to 3 inches are possible in the 
warned area, mainly across parts of Sebastian and Franklin counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3553 9488 3554 9376 3563 9370 3538 9371
      3543 9381 3531 9381 3532 9392 3522 9392
      3522 9403 3514 9403 3514 9414 3507 9425
      3497 9423 3493 9445 3486 9445 3469 9493
      3468 9551 3459 9551 3468 9609 3504 9609

FLASH FLOOD...RADAR AND GAUGE INDICATED

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 7:22 PM CDT	Special Weather Statement	TSA	Franklin	23 min
Apr 28, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	26 min
Apr 28, 7:42 PM CDT	Areal Flood Warning	TSA	Benton, Carroll, Crawford, Franklin, Madison, Washington	9 hr
Apr 28, 9:06 PM CDT	Severe Thunderstorm Warning	TSA	Crawford, Sebastian	39 min
Apr 28, 9:14 PM CDT	Tornado Warning	TSA	Sebastian	31 min
Apr 28, 9:19 PM CDT	Areal Flood Advisory	TSA	Crawford, Franklin, Sebastian	3 hr
Apr 28, 9:27 PM CDT	Flash Flood Warning	TSA	Crawford, Franklin, Sebastian	3 hr
Apr 28, 9:27 PM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	48 min
Apr 28, 9:29 PM CDT	Tornado Warning Considerable damage threat	TSA	Sebastian	28 min
Apr 28, 10:40 PM CDT	Flash Flood Warning	TSA	Crawford, Franklin, Madison, Washington	4 hr
Apr 29, 2:13 AM CDT	Special Weather Statement	TSA	Franklin	32 min
Apr 29, 2:35 AM CDT	Flash Flood Warning	TSA	Crawford, Franklin, Madison, Washington	4 hr
Apr 29, 7:18 AM CDT	Areal Flood Warning	TSA	Crawford, Franklin, Sebastian	10 hr
Apr 29, 11:36 AM CDT	River Flood Warning	TSA	Crawford, Franklin	9 hr
Apr 28, 7:19 PM CDT	Special Weather Statement	TSA	LeFlore	41 min
Apr 28, 7:56 PM CDT	Special Weather Statement	TSA	Haskell, Latimer	49 min
Apr 28, 8:25 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore	50 min
Apr 28, 8:31 PM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Sequoyah	4 hr
Apr 28, 8:50 PM CDT	Tornado Warning	TSA	LeFlore	25 min
Apr 28, 10:21 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	28 min
Apr 28, 10:58 PM CDT	Special Weather Statement	TSA	Choctaw	47 min
Apr 29, 12:04 AM CDT	Special Weather Statement	TSA	Pushmataha	26 min
Apr 29, 12:25 AM CDT	Special Weather Statement	TSA	Pittsburg	35 min
Apr 29, 12:54 AM CDT	Special Weather Statement	TSA	LeFlore	36 min
Apr 29, 1:47 AM CDT	Areal Flood Advisory	TSA	Choctaw, LeFlore, Pushmataha	4 hr
Apr 29, 1:49 AM CDT	Special Weather Statement	TSA	Choctaw	41 min
Apr 29, 10:56 AM CDT	River Flood Warning	TSA	Cherokee	4 hr

Nearby

Flash Flood Warnings in Oklahoma, 2021 Flash Flood Warnings in Arkansas, 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.