Alert archive / Mississippi / Flash Flood Warnings in 2021
Flash Flood Warning 79, NWS Memphis, TN
NWS Memphis, TN issued this flash flood warning at Aug 18, 2021, 4:18 PM CDT for Alcorn County, Prentiss County, Tippah County, Mississippi. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 18, 2021, 4:18 PM CDT (21:18 UTC)
- Expired
- Aug 18, 2021, 7:15 PM CDT
- In force
- 3 hr
- Issued by
- NWS Memphis, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Alcorn County, MS, Prentiss County, MS, Tippah County, MS
The radar
The Columbus AFB radar (KGWX), 91 km from the middle of the area, began a volume at 21:19 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 18, 4:22 PM CDT | FLASH FLOOD | Booneville, MS | FLOODING IN LOW LYING AREAS AND ROADWAYS. EM ESTIMATES OVER 2+ INCHES OF RAIN ON ROADWAYS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 9.3 hours before the alert went out and 117 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.
- Mixed-layer CAPE
- 1042 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 701 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 37 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.1
The text
As transmitted.
612
WGUS54 KMEG 182118
FFWMEG
MSC003-117-139-190015-
/O.NEW.KMEG.FF.W.0079.210818T2118Z-210819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
418 PM CDT Wed Aug 18 2021
The National Weather Service in Memphis has issued a
* Flash Flood Warning for...
South Central Alcorn County in northeastern Mississippi...
Northern Prentiss County in northeastern Mississippi...
Southeastern Tippah County in northeastern Mississippi...
* Until 715 PM CDT.
* At 418 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 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...
Booneville, Baldwyn, Jumpertown, Hinkle, Wheeler, Thrashers,
Rienzi, Gaston, Blackland, Frankstown, Geeville and Biggersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3460 8881 3461 8883 3476 8869 3485 8860
3486 8860 3473 8835 3452 8869 3455 8874
3459 8874 3460 8873
FLASH FLOOD...RADAR INDICATED
$$2 follow-up statements
992
WGUS74 KMEG 182208
FFSMEG
Flash Flood Statement
National Weather Service Memphis TN
508 PM CDT Wed Aug 18 2021
MSC003-117-139-190015-
/O.CON.KMEG.FF.W.0079.000000T0000Z-210819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Alcorn MS-Prentiss MS-Tippah MS-
508 PM CDT Wed Aug 18 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 715 PM CDT THIS
EVENING FOR SOUTH CENTRAL ALCORN, NORTHERN PRENTISS AND SOUTHEASTERN
TIPPAH COUNTIES...
At 508 PM CDT, Emergency management reported flooding of roadways in
the warned area. Between 1 and 3 inches of rain have fallen.
Additional rainfall amounts up to 1 inch are possible in the warned
area. Flash flooding is ongoing.
HAZARD...Flash flooding caused by thunderstorms and runoff.
SOURCE...Emergency management reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Booneville, Baldwyn, Jumpertown, Hinkle, Wheeler, Thrashers,
Rienzi, Gaston, Blackland, Frankstown, Geeville and Biggersville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3460 8881 3461 8883 3476 8869 3485 8860
3486 8860 3473 8835 3452 8869 3455 8874
3459 8874 3460 8873
FLASH FLOOD...OBSERVED
$$055
WGUS74 KMEG 190015
FFSMEG
Flash Flood Statement
National Weather Service Memphis TN
715 PM CDT Wed Aug 18 2021
MSC003-117-139-190025-
/O.EXP.KMEG.FF.W.0079.000000T0000Z-210819T0015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Alcorn MS-Prentiss MS-Tippah MS-
715 PM CDT Wed Aug 18 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 715 PM CDT THIS EVENING FOR
SOUTH CENTRAL ALCORN, NORTHERN PRENTISS AND SOUTHEASTERN TIPPAH
COUNTIES...
The heavy rain has ended. However, runoff could still post a threat.
Please continue to heed remaining road closures.
LAT...LON 3460 8881 3461 8883 3476 8869 3485 8860
3486 8860 3473 8835 3452 8869 3455 8874
3459 8874 3460 8873
$$The office that day
Everything else NWS Memphis, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 3:22 AM CDT | Areal Flood Advisory | MEG | Panola | 113 min |
| Aug 18, 8:24 AM CDT | Areal Flood Advisory | MEG | Marshall | 2 hr |
| Aug 18, 10:44 AM CDT | Special Weather Statement | MEG | Lafayette | 31 min |
| Aug 18, 12:07 PM CDT | Special Weather Statement | MEG | Tunica | 38 min |
| Aug 18, 12:46 PM CDT | Special Weather Statement | MEG | Quitman | 29 min |
| Aug 18, 1:28 PM CDT | Special Weather Statement | MEG | Panola | 32 min |
| Aug 18, 1:35 PM CDT | Special Weather Statement | MEG | Tate | 25 min |
| Aug 18, 1:49 PM CDT | Areal Flood Advisory | MEG | Panola, Tate | 2 hr |
| Aug 18, 2:02 PM CDT | Special Weather Statement | MEG | Lafayette | 28 min |
| Aug 18, 2:48 PM CDT | Special Weather Statement | MEG | Calhoun, Chickasaw | 27 min |
| Aug 18, 3:19 PM CDT | Special Weather Statement | MEG | Pontotoc | 26 min |
| Aug 18, 3:52 PM CDT | Special Weather Statement | MEG | Prentiss | 38 min |
| Aug 18, 4:23 PM CDT | Flash Flood Warning | MEG | Tishomingo | 3 hr |
| Aug 18, 6:20 PM CDT | Special Weather Statement | MEG | Chickasaw | 25 min |
Nearby
Flash Flood Warnings in Mississippi, 2021Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.