Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 89, NWS Memphis, TN

December 11, 20219 counties in Mississippi

NWS Memphis, TN issued this flash flood warning at Dec 11, 2021, 4:03 AM CST for 9 counties in Mississippi. 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: Dec 11, 2021, 4:03 AM CST (10:03 UTC)
Expired: Dec 11, 2021, 6:10 AM CST
In force: 2 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Calhoun County, MS, Lafayette County, MS, Lee County, MS, Pontotoc County, MS, Prentiss County, MS, Tallahatchie County, MS, Tippah County, MS, Union County, MS, Yalobusha County, MS

The radar

The Columbus AFB radar (KGWX), 122 km from the middle of the area, began a volume at 10:03 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, 10.1 hours before the alert went out and 94 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: 1725 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 398 m²/s²
0-3 km storm-relative helicity: 420 m²/s²
Significant tornado parameter: 4.8
Supercell composite: 16.2

Open this sounding in Storm Lab

The text

As transmitted.

853 
WGUS54 KMEG 111003
FFWMEG
MSC013-071-081-115-117-135-139-145-161-111315-
/O.NEW.KMEG.FF.W.0089.211211T1003Z-211211T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
403 AM CST Sat Dec 11 2021

The National Weather Service in Memphis has issued a

* Flash Flood Warning for...
  Northern Calhoun County in northeastern Mississippi...
  Northern Lee County in northeastern Mississippi...
  Pontotoc County in northeastern Mississippi...
  Southwestern Prentiss County in northeastern Mississippi...
  Southeastern Tippah County in northeastern Mississippi...
  Union County in northeastern Mississippi...
  Southeastern Lafayette County in northwestern Mississippi...
  East Central Tallahatchie County in northwestern Mississippi...
  Yalobusha County in northwestern Mississippi...

* Until 715 AM CST.

* At 403 AM CST, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 inches of rain 
  have fallen. The expected rainfall rate is 1 to 2 inches in 1 
  hour. 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...
  Tupelo, New Albany, Pontotoc, Water Valley, Baldwyn, Trace State 
  Park, Saltillo, Guntown, Bruce, Coffeeville, Ecru, Pittsboro, 
  Randolph, Tula, Denmark, Pinedale, Banner, Paris, New Harmony and 
  Velma.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3382 9016 3445 8922 3467 8883 3457 8844
      3395 8931 3387 8957 3387 8977 3390 8977
      3390 8993 3382 8993 3381 9014 3380 9014

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

$$

TLSJr

1 follow-up statement

743 
WGUS74 KMEG 111210
FFSMEG

Flash Flood Statement
National Weather Service Memphis TN
610 AM CST Sat Dec 11 2021

MSC013-071-081-115-117-135-139-145-161-111220-
/O.CAN.KMEG.FF.W.0089.000000T0000Z-211211T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Calhoun MS-Lafayette MS-Lee MS-Pontotoc MS-Prentiss MS-Tallahatchie
MS-Tippah MS-Union MS-Yalobusha MS-
610 AM CST Sat Dec 11 2021

...FLASH FLOOD WARNING IS CANCELLED FOR NORTHERN CALHOUN, NORTHERN 
LEE, PONTOTOC, SOUTHWESTERN PRENTISS, SOUTHEASTERN TIPPAH, UNION, 
SOUTHEASTERN LAFAYETTE, EAST CENTRAL TALLAHATCHIE AND YALOBUSHA 
COUNTIES...

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

LAT...LON 3382 9016 3445 8922 3467 8883 3457 8844
      3395 8931 3387 8957 3387 8977 3390 8977
      3390 8993 3382 8993 3381 9014 3380 9014

$$

TLSJr

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 10, 10:46 PM CST	Severe Thunderstorm Warning	MEG	Tunica	44 min
Dec 10, 11:25 PM CST	Severe Thunderstorm Warning	MEG	DeSoto	9 min
Dec 10, 11:48 PM CST	Severe Thunderstorm Warning	MEG	DeSoto, Marshall	42 min
Dec 11, 12:46 AM CST	Severe Thunderstorm Warning	MEG	Tunica	44 min
Dec 11, 12:48 AM CST	Severe Thunderstorm Warning	MEG	DeSoto, Tunica	42 min
Dec 11, 2:12 AM CST	Areal Flood Advisory	MEG	DeSoto, Tunica	3 hr
Dec 11, 2:41 AM CST	Severe Thunderstorm Warning	MEG	Benton, Marshall	49 min
Dec 11, 2:44 AM CST	Areal Flood Advisory	MEG	DeSoto	2 hr
Dec 11, 2:51 AM CST	Flash Flood Warning	MEG	DeSoto	2 hr
Dec 11, 2:55 AM CST	Severe Thunderstorm Warning	MEG	Panola, Tallahatchie, Yalobusha	50 min
Dec 11, 3:03 AM CST	Severe Thunderstorm Warning	MEG	Alcorn, Benton, Tippah	42 min
Dec 11, 3:19 AM CST	Areal Flood Advisory	MEG	Benton, Marshall, Tippah	3 hr
Dec 11, 3:59 AM CST	Severe Thunderstorm Warning	MEG	Lafayette, Lee, Pontotoc, Union	31 min
Dec 11, 4:07 AM CST	Special Weather Statement	MEG	Alcorn	23 min
Dec 11, 4:21 AM CST	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Prentiss, Tishomingo	39 min
Dec 11, 4:25 AM CST	Tornado Warning	MEG	Itawamba, Prentiss, Tishomingo	35 min
Dec 11, 4:55 AM CST	Areal Flood Advisory	MEG	Alcorn, Prentiss, Tippah, Tishomingo	3 hr
Dec 11, 4:58 AM CST	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Prentiss, Tishomingo	47 min
Dec 11, 5:12 AM CST	Severe Thunderstorm Warning	MEG	Itawamba, Lee, Prentiss, Tishomingo	33 min
Dec 11, 5:56 AM CST	Special Weather Statement	MEG	Monroe	79 min

Nearby

Flash Flood Warnings in Mississippi, 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.