Alert archive / Arkansas / Flash Flood Warnings in 2021

Flash Flood Warning 41, NWS Memphis, TN

May 4, 2021Clay County, Greene County, Arkansas

NWS Memphis, TN issued this flash flood warning at May 4, 2021, 1:46 AM CDT for Clay County, Greene 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: May 4, 2021, 1:46 AM CDT (06:46 UTC)
Expired: May 4, 2021, 4:45 AM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Clay County, AR, Greene County, AR

The radar

The Memphis radar (KNQA), 127 km from the middle of the area, began a volume at 06:47 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

Little Rock, AR (KLZK), launched 00:00Z, 6.8 hours before the alert went out and 174 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: 3608 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 1081 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 2.3
Supercell composite: 15.3

Open this sounding in Storm Lab

The text

As transmitted.

833 
WGUS54 KMEG 040646
FFWMEG
ARC021-055-040945-
/O.NEW.KMEG.FF.W.0041.210504T0646Z-210504T0945Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
146 AM CDT Tue May 4 2021

The National Weather Service in Memphis has issued a

* Flash Flood Warning for...
  Western Clay County in eastern Arkansas...
  Northwestern Greene County in eastern Arkansas...

* Until 445 AM CDT.

* At 146 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 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...
  Corning, Knobel, Peach Orchard, Delaplaine, Evening Star, 
  Brookings, Heelstring, Stonewall and Case.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 3629 9081 3629 9079 3628 9078 3629 9077
      3628 9075 3634 9075 3644 9061 3640 9052
      3633 9050 3620 9055 3611 9072 3613 9077
      3615 9075 3615 9081

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

$$

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 12:38 AM CDT	Severe Thunderstorm Warning	MEG	Clay, Greene	52 min
May 4, 1:30 AM CDT	Severe Thunderstorm Warning	MEG	Clay, Greene	45 min
May 4, 1:48 AM CDT	Special Weather Statement	MEG	Craighead, Poinsett	27 min
May 4, 1:57 AM CDT	Severe Thunderstorm Warning	MEG	Craighead, Greene, Poinsett	48 min
May 4, 2:08 AM CDT	Severe Thunderstorm Warning	MEG	Clay, Greene	52 min
May 4, 2:25 AM CDT	Severe Thunderstorm Warning	MEG	Clay, Craighead, Mississippi	50 min
May 4, 2:34 AM CDT	Severe Thunderstorm Warning	MEG	Crittenden, Cross, Mississippi, Poinsett	41 min
May 4, 2:58 AM CDT	Areal Flood Advisory	MEG	Clay	2 hr
May 4, 2:59 AM CDT	Severe Thunderstorm Warning	MEG	Mississippi	46 min
May 4, 3:10 AM CDT	Special Weather Statement	MEG	Crittenden	35 min
May 4, 4:47 AM CDT	Areal Flood Advisory	MEG	Crittenden	73 min
May 4, 11:37 AM CDT	River Flood Warning	MEG	Clay, Greene	47 hr
May 4, 5:03 PM CDT	Special Weather Statement	MEG	Craighead, Greene	27 min
May 4, 5:29 PM CDT	Special Weather Statement	MEG	Craighead, Greene, Poinsett	31 min
May 4, 5:56 PM CDT	Special Weather Statement	MEG	Craighead, Greene, Poinsett	34 min
May 4, 6:20 PM CDT	Special Weather Statement	MEG	Cross	40 min
May 4, 6:25 PM CDT	Special Weather Statement	MEG	Mississippi	35 min
May 4, 6:29 PM CDT	Severe Thunderstorm Warning	MEG	Crittenden, Cross, Mississippi, Poinsett	46 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.