Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 6, NWS Tulsa, OK

April 28, 20215 counties in Oklahoma

NWS Tulsa, OK issued this flash flood warning at Apr 28, 2021, 8:31 PM CDT for 5 counties in Oklahoma. It was in force for 4 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: Apr 28, 2021, 8:31 PM CDT (01:31 UTC)
Expired: Apr 29, 2021, 12:30 AM CDT
In force: 4 hr
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Flood severity: None

Counties Haskell County, OK, Latimer County, OK, LeFlore County, OK, Pittsburg County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 76 km from the middle of the area, began a volume at 01:30 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 00:00Z, 1.5 hours before the alert went out and 226 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.

893 
WGUS54 KTSA 290131
FFWTSA
OKC061-077-079-121-135-290530-
/O.NEW.KTSA.FF.W.0006.210429T0131Z-210429T0530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Tulsa OK
831 PM CDT Wed Apr 28 2021

The National Weather Service in Tulsa has issued a

* Flash Flood Warning for...
  Southern Sequoyah County in east central Oklahoma...
  Haskell County in southeastern Oklahoma...
  Latimer County in southeastern Oklahoma...
  Northwestern Le Flore County in southeastern Oklahoma...
  East Central Pittsburg County in southeastern Oklahoma...

* Until 1230 AM CDT.

* At 831 PM CDT, Doppler radar and automated rain gauges 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...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...
  Mcalester...                       Sallisaw...
  Wilburton...                       Stigler...
  Muldrow...                         Roland...
  Spiro...                           Hartshorne...
  Krebs...                           Panama...
  Talihina...                        Quinton...
  Keota...                           Red Oak...
  Mccurtain...                       Bokoshe...
  Fanshawe...                        Whitefield...
  Gans...                            Alderson...

Additional rainfall amounts of 1 to 2 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 3489 9576 3526 9523 3527 9523 3527 9522
      3528 9522 3529 9518 3529 9517 3531 9517
      3553 9487 3543 9445 3474 9500

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, 7:19 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, 8:50 PM CDT	Tornado Warning	TSA	LeFlore	25 min
Apr 28, 9:06 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	39 min
Apr 28, 9:14 PM CDT	Tornado Warning	TSA	LeFlore	31 min
Apr 28, 9:19 PM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	3 hr
Apr 28, 9:27 PM CDT	Flash Flood Warning	TSA	LeFlore, Sequoyah	3 hr
Apr 28, 10:21 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	28 min
Apr 28, 10:40 PM CDT	Flash Flood Warning	TSA	Adair, Sequoyah	4 hr
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, 12:19 AM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, Muskogee, Pittsburg, Sequoyah	6 hr
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, 2:35 AM CDT	Flash Flood Warning	TSA	Adair, Sequoyah	4 hr
Apr 29, 7:18 AM CDT	Areal Flood Warning	TSA	Choctaw, Haskell, Latimer, LeFlore, Pittsburg, Pushmataha and 1 more	10 hr
Apr 29, 10:56 AM CDT	River Flood Warning	TSA	Cherokee	4 hr

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