Alert archive / Oklahoma / Flash Flood Warnings in 2021

Flash Flood Warning 19, NWS Shreveport, LA

June 8, 2021McCurtain County, Oklahoma

NWS Shreveport, LA issued this flash flood warning at Jun 8, 2021, 8:57 AM CDT for McCurtain County, Oklahoma. It was in force for 2 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: Jun 8, 2021, 8:57 AM CDT (13:57 UTC)
Expired: Jun 8, 2021, 11:00 AM CDT
In force: 2 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County McCurtain County, OK

The radar

The Western Arkansas radar (KSRX), 101 km from the middle of the area, began a volume at 13:59 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

Shreveport, LA (KSHV), launched 12:00Z, 2.0 hours before the alert went out and 233 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: 1621 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 580 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 106 m²/s²
0-3 km storm-relative helicity: 218 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.1

Open this sounding in Storm Lab

The text

As transmitted.

469 
WGUS54 KSHV 081357
FFWSHV
OKC089-081600-
/O.NEW.KSHV.FF.W.0019.210608T1357Z-210608T1600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
857 AM CDT Tue Jun 8 2021

The National Weather Service in Shreveport has issued a

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

* Until 1100 AM CDT.

* At 857 AM CDT, Doppler radar 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...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Doppler radar.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Bethel, Smithville, Battiest, Watson, Pickens and Plunketville.

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.

Dangerous flash flooding is occurring or is imminent. Do not attempt 
to travel unless you are fleeing flood waters. If you are in an area 
subject to flooding, move to higher ground now.

Excessive runoff from heavy rainfall will cause flooding of small 
creeks and streams, country roads, farmland, and other low lying 
spots.

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.

&&

LAT...LON 3439 9446 3431 9505 3451 9505 3451 9446

FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 8:44 PM CDT	River Flood Warning	SHV	McCurtain	13 hr
Jun 7, 8:47 PM CDT	River Flood Warning	SHV	McCurtain	4 days
Jun 7, 8:47 PM CDT	River Flood Warning	SHV	McCurtain	5 days
Jun 8, 3:29 AM CDT	Areal Flood Advisory	SHV	McCurtain	2 hr
Jun 8, 5:13 AM CDT	River Flood Warning	SHV	McCurtain	52 hr
Jun 8, 5:33 AM CDT	Areal Flood Advisory	SHV	McCurtain	3 hr
Jun 8, 5:48 AM CDT	Flash Flood Warning Emergency	SHV	McCurtain	5 hr
Jun 8, 6:09 AM CDT	Special Weather Statement	SHV	McCurtain	36 min
Jun 8, 7:30 AM CDT	Flash Flood Warning Considerable damage threat	SHV	McCurtain	4 hr
Jun 8, 11:00 AM CDT	Areal Flood Warning	SHV	McCurtain	6 hr
Jun 8, 12:02 PM CDT	River Flood Warning	SHV	McCurtain	8 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.