Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 10, NWS Tulsa, OK

April 29, 20214 counties in Arkansas; Adair County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 29, 2021, 2:35 AM CDT for 4 counties in Arkansas; Adair County, Sequoyah County, Oklahoma. It was in force for 4 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, 2:35 AM CDT (07:35 UTC)
Expired: Apr 29, 2021, 6:15 AM CDT
In force: 4 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Crawford County, AR, Franklin County, AR, Madison County, AR, Washington County, AR, Adair County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 80 km from the middle of the area, began a volume at 07:36 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, 4:00 AM CDT	FLASH FLOOD	Turners Bend, AR	WIDESPREAD FLOODING ACROSS THE NORTHERN HALF OF THE COUNTY, WITH A COUPLE BRIDGES WASHED OUT AND SEVERAL WATER RESCUES.

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, 7.6 hours before the alert went out and 115 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.

215 
WGUS54 KTSA 290735
FFWTSA
ARC033-047-087-143-OKC001-135-291115-
/O.NEW.KTSA.FF.W.0010.210429T0735Z-210429T1115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Crawford County in northwestern Arkansas...
  Madison County in northwestern Arkansas...
  Washington AR County in northwestern Arkansas...
  Northern Franklin County in west central Arkansas...
  Northeastern Sequoyah County in east central Oklahoma...
  Southeastern Adair County in northeastern Oklahoma...

* Until 615 AM CDT.

* At 235 AM CDT, Doppler radar and automated rain gauges indicated 
  thunderstorms producing moderate rain across the warned area. 
  Between 2 and 5 inches of rain have fallen over the past 12 to 24 
  hours with some local amounts around 6 to 7 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...
  Fayetteville...                    Stilwell...
  Cedarville...                      Mountainburg...
  Natural Dam...                     Farmington...
  Prairie Grove...                   Elkins...
  West Fork...                       Lincoln...
  Greenland...                       Winslow...
  Marble City...                     Chester...
  St. Paul...                        Brentwood...
  Blackburn...                       Devils Den State Park...
  Lake Fort Smith...                 Strickler...

Additional rainfall amounts of 0.5 to 1 inch 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 9487 3610 9441 3610 9439 3611 9439
      3603 9345 3597 9345 3597 9347 3595 9347
      3595 9349 3592 9349 3593 9350 3588 9351
      3588 9352 3576 9352 3577 9370 3563 9370
      3554 9375

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, 12:19 AM CDT	Flash Flood Warning	TSA	Crawford, Franklin, Sebastian	6 hr
Apr 29, 2:13 AM CDT	Special Weather Statement	TSA	Franklin	32 min
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 Arkansas, 2021 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.