Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 33, NWS Memphis, TN

March 31, 2021Hardin County, McNairy County, Tennessee

NWS Memphis, TN issued this flash flood warning at Mar 31, 2021, 12:04 AM CDT for Hardin County, McNairy County, Tennessee. It was in force for 8 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: Mar 31, 2021, 12:04 AM CDT (05:04 UTC)
Expired: Mar 31, 2021, 8:00 AM CDT
In force: 8 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Hardin County, TN, McNairy County, TN

The radar

The Columbus AFB radar (KGWX), 149 km from the middle of the area, began a volume at 05:04 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 31, 3:15 AM CDT	FLASH FLOOD	3 E Savannah, TN	FLOODING IN SOME AREA IN HARDIN COUNTY. BURNT CHURCH AND OLIVEHILL. SOME WATER RESCUES ARE ONGOING.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 5.1 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2196 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 131 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

664 
WGUS54 KMEG 310504
FFWMEG
TNC071-109-310900-
/O.NEW.KMEG.FF.W.0033.210331T0504Z-210331T0900Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
1204 AM CDT Wed Mar 31 2021

The National Weather Service in Memphis has issued a

* Flash Flood Warning for...
  Hardin County in western Tennessee...
  Eastern McNairy County in western Tennessee...

* Until 400 AM CDT.

* At 1204 AM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 1 and 2 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...
  Savannah, Pickwick Landing State Park, Adamsville, Pickwick Dam, 
  Olive Hill, Shiloh, Walnut Grove, Morris Chapel, Crump, Michie, 
  Saltillo, Milledgeville, Maddox, Walkertown, Phillips, Bucktown, 
  Bruton Branch, Cerro Gordo, Lowryville and Center Star.

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

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.

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 3500 8840 3536 8839 3538 8802 3536 8802
      3536 8801 3535 8801 3533 8802 3531 8801
      3529 8802 3529 8800 3529 8798 3501 8798
      3501 8820 3500 8820

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

$$

TLSJr

1 follow-up statement

105 
WGUS54 KMEG 310839
FFWMEG
TNC071-109-311300-
/O.EXT.KMEG.FF.W.0033.000000T0000Z-210331T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
339 AM CDT Wed Mar 31 2021

The National Weather Service in Memphis has extended the

* Flash Flood Warning for...
  Hardin County in western Tennessee...
  Eastern McNairy County in western Tennessee...

* Until 800 AM CDT.

* At 339 AM CDT, emergency management reported thunderstorms 
  produced heavy rain across the warned area and has caused flash 
  flooding. Between 2 and 4 inches of rain have fallen.

  HAZARD...Life threatening flash flooding. Thunderstorms
           producing flash flooding.

  SOURCE...Emergency management.

  IMPACT...Life threatening flash flooding of creeks and streams,
           urban areas, highways, streets and underpasses.

* Some locations that will experience flash flooding include...
  Savannah, Pickwick Landing State Park, Adamsville, Pickwick Dam, 
  Olive Hill, Shiloh, Walnut Grove, Morris Chapel, Crump, Michie, 
  Saltillo, Milledgeville, Maddox, Walkertown, Phillips, Bucktown, 
  Bruton Branch, Cerro Gordo, Lowryville and Center Star.

Additional rainfall amounts up to 0.5 inches are possible in the 
warned area.

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 3500 8840 3536 8839 3538 8802 3536 8802
      3536 8801 3535 8801 3533 8802 3531 8801
      3529 8802 3529 8800 3529 8798 3501 8798
      3501 8820 3500 8820

FLASH FLOOD...OBSERVED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
EXPECTED RAINFALL...0.5 INCHES IN 3 HOURS 

$$

TLSJr

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 7:50 PM CDT	Areal Flood Advisory	MEG	Shelby	3 hr
Mar 30, 7:56 PM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Mar 30, 9:03 PM CDT	Special Weather Statement	MEG	Fayette	27 min
Mar 30, 9:25 PM CDT	Special Weather Statement	MEG	Fayette	50 min
Mar 30, 9:30 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Hardeman	45 min
Mar 30, 9:54 PM CDT	Flash Flood Warning	MEG	Fayette, Hardeman, Shelby	3 hr
Mar 30, 10:26 PM CDT	Special Weather Statement	MEG	Hardin, McNairy	49 min
Mar 30, 10:31 PM CDT	Areal Flood Advisory	MEG	Chester, Hardeman, McNairy	3 hr
Mar 30, 11:29 PM CDT	Areal Flood Advisory	MEG	Hardin, McNairy	35 min
Mar 31, 5:31 AM CDT	Freeze Watch	MEG	Fayette, Hardeman, Hardin, McNairy, Shelby	9 hr
Mar 31, 5:31 AM CDT	Freeze Watch	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	9 hr
Mar 31, 5:31 AM CDT	Freeze Warning	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	27 hr
Mar 31, 8:05 AM CDT	Areal Flood Warning	MEG	Hardin, McNairy	10 min
Mar 31, 8:28 AM CDT	Areal Flood Warning	MEG	Chester, Decatur, Hardin, McNairy	3 hr
Mar 31, 9:06 AM CDT	River Flood Warning	MEG	Hardeman	3 days
Mar 31, 10:15 AM CDT	River Flood Warning	MEG	Dyer, Gibson, Obion	70 hr
Mar 31, 2:34 PM CDT	Freeze Warning	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	42 hr

Nearby

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.