Alert archive / Mississippi / Flash Flood Warnings in 2021

Flash Flood Warning 7, NWS Memphis, TN

March 17, 20216 counties in Mississippi; Fayette County, Hardeman County, McNairy County, Tennessee

NWS Memphis, TN issued this flash flood warning at Mar 17, 2021, 9:04 AM CDT for 6 counties in Mississippi; Fayette County, Hardeman County, McNairy County, Tennessee. It was in force for 3 hr. 3 reports 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: Mar 17, 2021, 9:04 AM CDT (14:04 UTC)
Expired: Mar 17, 2021, 12:15 PM CDT
In force: 3 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Alcorn County, MS, Benton County, MS, DeSoto County, MS, Marshall County, MS, Tate County, MS, Tippah County, MS, Fayette County, TN, Hardeman County, TN, McNairy County, TN

The radar

The Memphis radar (KNQA), 69 km from the middle of the area, began a volume at 14:05 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
Mar 17, 9:23 AM CDT	FLASH FLOOD	5 S Walnut, MS	WATER OVER HWY 15 5-7 INCHES DEEP.
Mar 17, 10:30 AM CDT	FLASH FLOOD	1 Sw Middleton, TN	SASSAR ROAD CLOSED DUE TO FLOODING. TIME ESTIMATED.
Mar 17, 11:00 AM CDT	FLASH FLOOD	2 N Pocahontas, TN	PEAVINE ROAD FLOODED BETWEEN BUSTER ROAD AND BREEZEWOOD LANE.

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, 2.1 hours before the alert went out and 60 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: 18 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1466 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 217 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

917 
WGUS54 KMEG 171404
FFWMEG
MSC003-009-033-093-137-139-TNC047-069-109-171715-
/O.NEW.KMEG.FF.W.0007.210317T1404Z-210317T1715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
904 AM CDT Wed Mar 17 2021

The National Weather Service in Memphis has issued a

* Flash Flood Warning for...
  Northwestern Alcorn County in northeastern Mississippi...
  Northern Benton County in northeastern Mississippi...
  Northwestern Tippah County in northeastern Mississippi...
  Southeastern DeSoto County in northwestern Mississippi...
  Northern Marshall County in northwestern Mississippi...
  Northeastern Tate County in northwestern Mississippi...
  Southeastern Fayette County in western Tennessee...
  Southern Hardeman County in western Tennessee...
  Southwestern McNairy County in western Tennessee...

* Until 1215 PM CDT.

* At 904 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...
  Hernando, Holly Springs, Lamar, Byhalia, Snow Lake Shores, 
  Slayden, Michigan City, Mt Pleasant, Lagrange, Canaan, Red Banks, 
  Lewisburg, Independence, Pocahontas, Walnut, Middleton, Ashland, 
  Grand Junction, La Grange and Saulsbury.

Additional rainfall amounts up to 1 inch are possible in the warned 
area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

A Flash Flood Warning means that flooding is imminent or occurring. 
If you are in the warned area move to higher ground immediately. 
Residents living along streams and creeks should take immediate 
precautions to protect life and property.

&&

LAT...LON 3483 9002 3502 8942 3506 8920 3509 8905
      3511 8873 3500 8876 3490 8879 3481 8912
      3468 8989

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...1 INCH IN 1 HOUR 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 17, 3:38 AM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Pontotoc, Yalobusha	37 min
Mar 17, 5:24 AM CDT	Severe Thunderstorm Warning	MEG	Panola, Tate	20 min
Mar 17, 6:35 AM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Panola, Quitman, Tallahatchie, Tunica	40 min
Mar 17, 6:49 AM CDT	Severe Thunderstorm Warning	MEG	Marshall	14 min
Mar 17, 7:12 AM CDT	Severe Thunderstorm Warning	MEG	Lafayette, Marshall, Panola, Quitman, Tallahatchie, Tate and 1 more	48 min
Mar 17, 8:24 AM CDT	Areal Flood Advisory	MEG	Benton, DeSoto, Marshall, Tate, Tunica	2 hr
Mar 17, 10:29 AM CDT	Flash Flood Warning	MEG	Alcorn, Prentiss, Tishomingo	3 hr
Mar 17, 3:18 PM CDT	Tornado Warning	MEG	Itawamba, Prentiss, Tishomingo	27 min
Mar 17, 4:17 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Pontotoc, Union	28 min
Mar 17, 4:28 PM CDT	Areal Flood Advisory	MEG	Itawamba, Prentiss, Tishomingo	5 hr
Mar 17, 4:43 PM CDT	Severe Thunderstorm Warning	MEG	Benton, Lafayette, Marshall, Union	32 min
Mar 17, 4:52 PM CDT	Flash Flood Warning	MEG	Itawamba, Lee, Prentiss, Tishomingo	4 hr
Mar 17, 4:56 PM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Pontotoc, Prentiss, Union	49 min
Mar 17, 4:58 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Chickasaw, Pontotoc	20 min
Mar 17, 5:45 PM CDT	Severe Thunderstorm Warning	MEG	Chickasaw, Itawamba, Lee, Monroe	45 min
Mar 17, 5:55 PM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw	4 hr
Mar 17, 5:55 PM CDT	Tornado Warning	MEG	Chickasaw, Itawamba, Lee, Monroe	35 min
Mar 17, 6:28 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Monroe	47 min
Mar 17, 6:33 PM CDT	Special Weather Statement	MEG	Lafayette, Marshall, Yalobusha	42 min
Mar 17, 11:38 AM CDT	Flash Flood Warning	MEG	Shelby, Tipton	3 hr
Mar 17, 12:24 PM CDT	Special Weather Statement	MEG	Shelby	36 min
Mar 17, 12:31 PM CDT	Special Weather Statement	MEG	Tipton	29 min
Mar 17, 1:18 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Fayette, Hardeman, Haywood, Madison, Tipton	42 min
Mar 17, 1:54 PM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Mar 17, 1:58 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Decatur, Hardeman, Henderson, Madison	47 min
Mar 17, 5:26 PM CDT	River Flood Warning	MEG	Crockett, Dyer, Lauderdale	15 hr

Nearby

Flash Flood Warnings in Mississippi, 2021 Flash Flood Warnings in Tennessee, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.