Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 13, NWS Shreveport, LA

May 26, 20214 counties in Arkansas

NWS Shreveport, LA issued this flash flood warning at May 26, 2021, 4:20 AM CDT for 4 counties in Arkansas. 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: May 26, 2021, 4:20 AM CDT (09:20 UTC)
Expired: May 26, 2021, 8:30 AM CDT
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

Counties Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR

The radar

The Shreveport radar (KSHV), 106 km from the middle of the area, began a volume at 09:21 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 00:00Z, 9.3 hours before the alert went out and 100 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: 11 J/kg
Mixed-layer CIN: -327 J/kg
Mixed-layer LCL: 1125 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

086 
WGUS54 KSHV 260920
FFWSHV
ARC027-073-091-139-261330-
/O.NEW.KSHV.FF.W.0013.210526T0920Z-210526T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
420 AM CDT Wed May 26 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Western Union County in south central Arkansas...
  Central Columbia County in southwestern Arkansas...
  Central Lafayette County in southwestern Arkansas...
  East Central Miller County in southwestern Arkansas...

* Until 830 AM CDT.

* At 420 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  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...
  Magnolia, Stamps, Waldo, McNeil, Garland, Smithland, Macedonia, 
  Canfield, Mount Vernon, Cornelius, McKamie, Lerch, Mars Hill, 
  Laughlin and Medlock.

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.

&&

LAT...LON 3320 9376 3336 9382 3335 9371 3333 9348
      3336 9330 3342 9312 3340 9312 3338 9312
      3338 9300 3338 9298 3338 9297 3338 9294
      3315 9327 3315 9348 3315 9366

FLASH FLOOD...RADAR INDICATED

$$

09

1 follow-up statement

028 
WGUS74 KSHV 261151
FFSSHV

Flash Flood Statement
National Weather Service Shreveport LA
651 AM CDT Wed May 26 2021

ARC027-073-091-139-261330-
/O.CON.KSHV.FF.W.0013.000000T0000Z-210526T1330Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Columbia AR-Lafayette AR-Miller AR-Union AR-
651 AM CDT Wed May 26 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 830 AM CDT THIS 
MORNING FOR WESTERN UNION, CENTRAL COLUMBIA, CENTRAL LAFAYETTE AND 
EAST CENTRAL MILLER COUNTIES...

At 651 AM CDT, Doppler radar indicated thunderstorms producing heavy 
rain across the warned area. Between 2 and 3 inches of rain have 
fallen. Flash flooding is already occurring.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Doppler radar.

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...
  Magnolia, Stamps, Waldo, McNeil, Garland, Smithland, Macedonia, 
  Canfield, Mount Vernon, Cornelius, McKamie, Lerch, Mars Hill, 
  Laughlin and Medlock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3320 9376 3336 9382 3335 9371 3333 9348
      3336 9330 3342 9312 3340 9312 3338 9312
      3338 9300 3338 9298 3338 9297 3338 9294
      3315 9327 3315 9348 3315 9366

FLASH FLOOD...RADAR INDICATED

$$

09

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 12:54 AM CDT	Flash Flood Warning	SHV	Little River, Miller	8 hr
May 26, 2:23 AM CDT	Flash Flood Warning	SHV	Columbia, Hempstead, Lafayette, Little River, Miller, Nevada	3 hr
May 26, 3:56 AM CDT	Special Weather Statement	SHV	Columbia, Lafayette	64 min
May 26, 9:10 AM CDT	Areal Flood Advisory	SHV	Little River, Miller	110 min
May 26, 11:43 AM CDT	Areal Flood Advisory	SHV	Little River, Miller	3 hr

Nearby

Flash Flood Warnings in Arkansas, 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.