Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 45, NWS Tulsa, OK

July 16, 2021LeFlore County, Oklahoma; Crawford County, Sebastian County, Arkansas

NWS Tulsa, OK issued this flash flood warning at Jul 16, 2021, 11:47 AM CDT for LeFlore County, Oklahoma; Crawford County, Sebastian County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 16, 2021, 11:47 AM CDT (16:47 UTC)
Expired: Jul 16, 2021, 2:35 PM CDT
In force: 3 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Crawford County, AR, Sebastian County, AR, LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 9 km from the middle of the area, began a volume at 16:51 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.

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 4.8 hours before the alert went out and 187 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: 18 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 860 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 20 m²/s²
0-3 km storm-relative helicity: 73 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

352 
WGUS54 KTSA 161647
FFWTSA
ARC033-131-OKC079-161945-
/O.NEW.KTSA.FF.W.0045.210716T1647Z-210716T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
1147 AM CDT Fri Jul 16 2021

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Southwestern Crawford County in northwestern Arkansas...
  Northwestern Sebastian County in west central Arkansas...
  Northeastern Le Flore County in southeastern Oklahoma...

* Until 245 PM CDT.

* At 1147 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 3 inches of rain 
  have fallen. Additional rainfall amounts of 1 to 2 inches are 
  possible in the warned area. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Radar.

  IMPACT...Flash flooding of small creeks and streams, urban
           areas, highways, streets and underpasses as well as
           other poor drainage and low-lying areas.

* Some locations that will experience flash flooding include...
  Fort Smith...                      Van Buren...
  Greenwood...                       Barling...
  Pocola...                          Lavaca...
  Spiro...                           Arkoma...
  Hackett...                         Bonanza...
  Jenny Lind...                      Fort Smith Regional Airport...
  Excelsior...                       Burnville...
  Rock Island...                     Central City...
  Rye Hill...                        Mill Creek...
  Jenson...                          Braden...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3510 9448 3527 9466 3533 9457 3530 9454
      3530 9449 3532 9448 3533 9450 3534 9449
      3535 9448 3537 9449 3538 9447 3538 9444
      3541 9443 3543 9441 3537 9412 3515 9420

FLASH FLOOD...RADAR INDICATED

$$

1 follow-up statement

827 
WGUS74 KTSA 161935
FFSTSA

Flash Flood Statement
National Weather Service Tulsa OK
235 PM CDT Fri Jul 16 2021

ARC033-131-OKC079-161945-
/O.CAN.KTSA.FF.W.0045.000000T0000Z-210716T1945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Crawford AR-Sebastian AR-Le Flore OK-
235 PM CDT Fri Jul 16 2021

...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN CRAWFORD, 
NORTHWESTERN SEBASTIAN AND NORTHEASTERN LE FLORE COUNTIES...

Flood waters have receded. The heavy rain has ended. Flooding is no 
longer expected to pose a threat. Please continue to heed remaining 
road closures.

LAT...LON 3510 9448 3527 9466 3533 9457 3530 9454
      3530 9449 3532 9448 3533 9450 3534 9449
      3535 9448 3537 9449 3538 9447 3538 9444
      3541 9443 3543 9441 3537 9412 3515 9420

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 12:46 AM CDT	Special Weather Statement	TSA	Nowata, Osage, Washington	44 min
Jul 16, 1:29 AM CDT	Special Weather Statement	TSA	Craig, Nowata, Washington	46 min
Jul 16, 2:14 AM CDT	Special Weather Statement	TSA	Craig, Nowata, Ottawa	46 min
Jul 16, 6:45 AM CDT	Special Weather Statement	TSA	Tulsa	30 min
Jul 16, 7:37 AM CDT	Areal Flood Advisory	TSA	Adair, Cherokee, Delaware	3 hr
Jul 16, 8:38 AM CDT	River Flood Warning	TSA	Ottawa	4 days
Jul 16, 10:41 AM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	2 hr
Jul 16, 1:09 PM CDT	Areal Flood Advisory	TSA	LeFlore	2 hr
Jul 16, 9:40 AM CDT	Special Weather Statement	TSA	Logan	50 min

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.