Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 16, NWS Shreveport, LA

June 7, 2021McCurtain County, Oklahoma

NWS Shreveport, LA issued this flash flood warning at Jun 7, 2021, 5:01 PM CDT for McCurtain County, Oklahoma. It was in force for 5 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: Jun 7, 2021, 5:01 PM CDT (22:01 UTC)
Expired: Jun 7, 2021, 10:13 PM CDT
In force: 5 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 130 km from the middle of the area, began a volume at 22:03 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
Jun 7, 9:00 PM CDT	FLASH FLOOD	Broken Bow, OK	SEVERAL ROADS CLOSED DUE TO SWIFT WATER OVER ROADS. SEVERAL ABANDONED VEHICLES IN HIGH WATER.

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.0 hours before the alert went out and 220 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: 2401 J/kg
Mixed-layer CIN: -18 J/kg
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 64 m²/s²
0-3 km storm-relative helicity: 123 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

890 
WGUS54 KSHV 072201
FFWSHV
OKC089-080400-
/O.NEW.KSHV.FF.W.0016.210607T2201Z-210608T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
501 PM CDT Mon Jun 7 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  McCurtain County in southeastern Oklahoma...

* Until 1100 PM CDT.

* At 501 PM CDT, trained weather spotters reported thunderstorms 
  producing heavy rain across the warned area. Between 2 and 3 
  inches of rain have fallen. Flash flooding is ongoing or expected 
  to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Trained spotters.

  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...
  Idabel, Broken Bow, Wright City, Valliant, Millerton, Garvin, 
  Mount Herman, Sherwood, Hochatown, Bethel, Glover, Oak Hill, 
  Golden, Battiest, Holly Creek, Pickens, Eagletown, Smithville, 
  Slim and Watson.

Additional rainfall amounts of 2 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.

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3424 9515 3424 9505 3451 9505 3451 9446
      3408 9447 3390 9474 3394 9516

FLASH FLOOD...OBSERVED
EXPECTED RAINFALL...1-2 INCHES IN 1 HOUR 

$$

19

1 follow-up statement

872 
WGUS74 KSHV 080313
FFSSHV

Flash Flood Statement
National Weather Service Shreveport LA
1013 PM CDT Mon Jun 7 2021

OKC089-080323-
/O.CAN.KSHV.FF.W.0016.000000T0000Z-210608T0400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
McCurtain OK-
1013 PM CDT Mon Jun 7 2021

...FLASH FLOOD WARNING IS CANCELLED FOR MCCURTAIN COUNTY...

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

A Flash Flood Watch remains in effect until 700 PM CDT Tuesday for 
portions of Arkansas...southeast Oklahoma and northeast Texas.

LAT...LON 3424 9515 3424 9505 3451 9505 3451 9446
      3408 9447 3390 9474 3394 9516

$$

19

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 6, 8:40 PM CDT	Special Weather Statement	SHV	McCurtain	65 min
Jun 6, 9:36 PM CDT	Special Weather Statement	SHV	McCurtain	39 min
Jun 7, 3:04 AM CDT	Flash Flood Watch	SHV	McCurtain	52 hr
Jun 7, 4:39 PM CDT	Areal Flood Advisory	SHV	McCurtain	3 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.