Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 1, NWS Little Rock, AR

December 31, 2020Polk County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Dec 31, 2020, 8:44 PM CST for Polk County, Arkansas. It was in force for 3 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 31, 2020, 8:44 PM CST (02:44 UTC)
Expired: Dec 31, 2020, 11:32 PM CST
In force: 3 hr
Issued by: NWS Little Rock, AR
Area: Storm-based polygon
Flood severity: None

County Polk County, AR

The radar

The Western Arkansas radar (KSRX), 93 km from the middle of the area, began a volume at 02:46 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, 2.7 hours before the alert went out and 225 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: 6 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 429 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 810 m²/s²
0-3 km storm-relative helicity: 899 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

194 
WGUS54 KLZK 010244
FFWLZK
ARC113-010545-
/O.NEW.KLZK.FF.W.0001.210101T0244Z-210101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Little Rock AR
844 PM CST Thu Dec 31 2020

The National Weather Service in Little Rock has issued a

* Flash Flood Warning for...
  Polk County in western Arkansas...

* Until 1145 PM CST.

* At 843 PM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 1.5 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...
  Mena, Wickes, Grannis, Hatfield, Vandervoort, Mena Intermountain 
  Airport, Polk County Fairgrounds, Mccauley, Cossatot River State 
  Park, Shady, Hartley, Caney Creek Wilderness, Bard Springs 
  Recreation Area, Opal, Queen Wilhelmina State Park, Mountain Fork, 
  Cove, Acorn, Big Fork and Dallas.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the 
dangers of flooding.

&&

LAT...LON 3420 9446 3472 9445 3472 9433 3470 9432
      3469 9402 3468 9403 3468 9394 3435 9394
      3436 9425 3427 9426 3427 9425 3419 9425

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1-2 INCHES IN 3 HOURS 

$$

Cavanaugh

1 follow-up statement

795 
WGUS74 KLZK 010532
FFSLZK

Flash Flood Statement
National Weather Service Little Rock AR
1132 PM CST Thu Dec 31 2020

ARC113-010542-
/O.CAN.KLZK.FF.W.0001.000000T0000Z-210101T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Polk AR-
1132 PM CST Thu Dec 31 2020

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

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

LAT...LON 3420 9446 3472 9445 3472 9433 3470 9432
      3469 9402 3468 9403 3468 9394 3435 9394
      3436 9425 3427 9426 3427 9425 3419 9425

$$

Cooper

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 1, 11:05 AM CST	River Flood Warning	LZK	Clark, Hot Spring	16 hr
Jan 1, 11:17 AM CST	River Flood Advisory	LZK	Clark, Nevada, Ouachita	21 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.