Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 34, NWS Shreveport, LA

December 10, 2021Hempstead County, Arkansas

NWS Shreveport, LA issued this flash flood warning at Dec 10, 2021, 9:08 PM CST for Hempstead County, 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: Dec 10, 2021, 9:08 PM CST (03:08 UTC)
Expired: Dec 11, 2021, 1:00 AM CST
In force: 4 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Damage threat: Considerable
Flood severity: None

County Hempstead County, AR

The radar

The Little Rock radar (KLZK), 159 km from the middle of the area, began a volume at 03:07 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, 3.1 hours before the alert went out and 163 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: 1338 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 1005 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 243 m²/s²
0-3 km storm-relative helicity: 334 m²/s²
Significant tornado parameter: 2.6
Supercell composite: 10.4

Open this sounding in Storm Lab

The text

As transmitted.

231 
WGUS54 KSHV 110308
FFWSHV
ARC057-110615-
/O.NEW.KSHV.FF.W.0034.211211T0308Z-211211T0615Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
908 PM CST Fri Dec 10 2021

The National Weather Service in Shreveport has issued a

* Flash Flood Warning for...
  Northeastern Hempstead County in southwestern Arkansas...

* Until 1215 AM CST.

* At 908 PM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Radar.

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

* Some locations that will experience flash flooding include...
  McCaskill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3396 9346 3390 9346 3390 9358 3383 9382
      3394 9382 3399 9376 3400 9374 3398 9368
      3398 9365 3396 9361 3395 9357 3394 9353
      3394 9351

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

$$

50

1 follow-up statement

036 
WGUS54 KSHV 110457
FFWSHV
ARC057-110700-
/O.EXT.KSHV.FF.W.0034.000000T0000Z-211211T0700Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Shreveport LA
1057 PM CST Fri Dec 10 2021

The National Weather Service in Shreveport has extended the

* Flash Flood Warning for...
  Northeastern Hempstead County in southwestern Arkansas...

* Until 100 AM CST.

* At 1057 PM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 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...
  McCaskill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3396 9346 3390 9346 3390 9358 3383 9382
      3394 9382 3399 9376 3400 9374 3398 9368
      3398 9365 3396 9361 3395 9357 3394 9353
      3394 9351

FLASH FLOOD...RADAR INDICATED

$$

44

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 6:15 PM CST	Severe Thunderstorm Warning	SHV	Little River	60 min
Dec 10, 7:05 PM CST	Severe Thunderstorm Warning Considerable damage threat	SHV	Little River, Sevier	55 min
Dec 10, 7:30 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Nevada, Sevier	45 min
Dec 10, 8:00 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Sevier	45 min
Dec 10, 8:28 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Nevada	62 min
Dec 10, 9:22 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	29 min
Dec 10, 10:06 PM CST	Special Weather Statement	SHV	Little River	24 min
Dec 10, 10:20 PM CST	Severe Thunderstorm Warning	SHV	Little River, Miller	55 min
Dec 10, 10:58 PM CST	Severe Thunderstorm Warning	SHV	Hempstead, Lafayette, Nevada	62 min
Dec 10, 11:30 PM CST	Severe Thunderstorm Warning	SHV	Lafayette, Miller	45 min
Dec 11, 12:09 AM CST	Severe Thunderstorm Warning	SHV	Columbia, Lafayette	51 min
Dec 11, 1:15 AM CST	Special Weather Statement	SHV	Union	45 min

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.