Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 20, NWS Memphis, TN

March 27, 20216 counties in Tennessee

NWS Memphis, TN issued this flash flood warning at Mar 27, 2021, 9:33 AM CDT for 6 counties in Tennessee. It was in force for 5 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 27, 2021, 9:33 AM CDT (14:33 UTC)
Expired: Mar 27, 2021, 2:30 PM CDT
In force: 5 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

Counties Chester County, TN, Decatur County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, McNairy County, TN

The radar

The Memphis radar (KNQA), 155 km from the middle of the area, began a volume at 14:37 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 27, 10:16 AM CDT	FLASH FLOOD	Savannah, TN	FLOODING ACROSS COBBLESTONE DR JUST NORTH OF SAVANNAH, TN. ROAD IMPASSABLE.
Mar 27, 10:21 AM CDT	FLASH FLOOD	Savannah, TN	FLOODING ACROSS GLENDALE ROAD NEAR HWY 69 JUST NW OF SAVANNAH, TN. ROAD IMPASSABLE.
Mar 27, 10:45 AM CDT	FLASH FLOOD	Ne Selmer, TN	FLOODING AT SELMER CITY PARK.

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 12:00Z, 2.6 hours before the alert went out and 168 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: 710 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 347 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

261 
WGUS54 KMEG 271433
FFWMEG
TNC023-039-069-071-077-109-271930-
/O.NEW.KMEG.FF.W.0020.210327T1433Z-210327T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Memphis TN
933 AM CDT Sat Mar 27 2021

The National Weather Service in Memphis has issued a

* Flash Flood Warning for...
  Southeastern Chester County in western Tennessee...
  Southern Decatur County in western Tennessee...
  Southeastern Hardeman County in western Tennessee...
  Northern Hardin County in western Tennessee...
  South Central Henderson County in western Tennessee...
  McNairy County in western Tennessee...

* Until 230 PM CDT.

* At 933 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, Selmer, Big Hill Pond State Park, Adamsville, Sardis, 
  Morris Chapel, Olive Hill, Pocahontas, Robertson, McNairy, Crump, 
  Bethel Springs, Eastview, Ramer, Saltillo, Hornsby, Stantonville, 
  Milledgeville, Enville and Hickory Flats.

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 3500 8883 3518 8890 3546 8836 3545 8804
      3543 8803 3542 8798 3539 8798 3539 8801
      3539 8803 3536 8802 3536 8801 3535 8801
      3533 8802 3529 8802 3529 8800 3529 8798
      3522 8798

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

$$

TLSJr

2 follow-up statements

090 
WGUS74 KMEG 271821
FFSMEG

Flash Flood Statement
National Weather Service Memphis TN
121 PM CDT Sat Mar 27 2021

TNC023-039-069-071-077-109-271930-
/O.CON.KMEG.FF.W.0020.000000T0000Z-210327T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester TN-Decatur TN-Hardeman TN-Hardin TN-Henderson TN-McNairy TN-
121 PM CDT Sat Mar 27 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT THIS 
AFTERNOON FOR SOUTHEASTERN CHESTER, SOUTHERN DECATUR, SOUTHEASTERN 
HARDEMAN, NORTHERN HARDIN, SOUTH CENTRAL HENDERSON AND MCNAIRY 
COUNTIES...

At 121 PM CDT, the public reported flooding on roads from earlier 
thunderstorms across the warned area. Flash flooding is ongoing.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Public.

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, Selmer, Big Hill Pond State Park, Adamsville, Sardis, 
  Morris Chapel, Olive Hill, Pocahontas, Robertson, McNairy, Crump, 
  Bethel Springs, Eastview, Ramer, Saltillo, Hornsby, Stantonville, 
  Milledgeville, Enville and Hickory Flats.

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 3500 8883 3518 8890 3546 8836 3545 8804
      3543 8803 3542 8798 3539 8798 3539 8801
      3539 8803 3536 8802 3536 8801 3535 8801
      3533 8802 3529 8802 3529 8800 3529 8798
      3522 8798

FLASH FLOOD...OBSERVED

$$

TLSJr

684 
WGUS74 KMEG 271925
FFSMEG

Flash Flood Statement
National Weather Service Memphis TN
225 PM CDT Sat Mar 27 2021

TNC023-039-069-071-077-109-271935-
/O.EXP.KMEG.FF.W.0020.000000T0000Z-210327T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Chester TN-Decatur TN-Hardeman TN-Hardin TN-Henderson TN-McNairy TN-
225 PM CDT Sat Mar 27 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 230 PM CDT THIS AFTERNOON FOR 
SOUTHEASTERN CHESTER, SOUTHERN DECATUR, SOUTHEASTERN HARDEMAN, 
NORTHERN HARDIN, SOUTH CENTRAL HENDERSON AND MCNAIRY COUNTIES...

Flood waters have receded. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures. Several 
roads have may have been washed out.

A Flash Flood Watch remains in effect until 700 AM CDT Sunday for 
portions of East Arkansas...North Mississippi...Southeast Missouri 
and West Tennessee.

LAT...LON 3500 8883 3518 8890 3546 8836 3545 8804
      3543 8803 3542 8798 3539 8798 3539 8801
      3539 8803 3536 8802 3536 8801 3535 8801
      3533 8802 3529 8802 3529 8800 3529 8798
      3522 8798

$$

TLSJr

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 2:44 AM CDT	Flash Flood Watch	MEG	Benton, Carroll, Chester, Crockett, Decatur, Dyer and 15 more	24 hr
Mar 27, 4:59 AM CDT	Special Weather Statement	MEG	Tipton	31 min
Mar 27, 5:06 AM CDT	Special Weather Statement	MEG	Carroll, Madison	24 min
Mar 27, 5:13 AM CDT	Flash Flood Warning	MEG	Shelby	3 hr
Mar 27, 5:14 AM CDT	Flash Flood Warning	MEG	Madison	3 hr
Mar 27, 5:20 AM CDT	Special Weather Statement	MEG	Shelby	40 min
Mar 27, 5:34 AM CDT	Severe Thunderstorm Warning	MEG	Shelby	41 min
Mar 27, 5:37 AM CDT	Special Weather Statement	MEG	Benton, Carroll	53 min
Mar 27, 5:56 AM CDT	Special Weather Statement	MEG	Fayette	49 min
Mar 27, 7:00 AM CDT	Special Weather Statement	MEG	Chester, Henderson, McNairy	30 min
Mar 27, 7:16 AM CDT	Special Weather Statement	MEG	Decatur, Hardin, Henderson	29 min
Mar 27, 9:01 AM CDT	Areal Flood Advisory	MEG	Fayette, Haywood, Shelby, Tipton	3 hr
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Fayette, Shelby	44 hr
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Madison	4 days
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Crockett, Dyer, Lauderdale	14 days
Mar 27, 11:29 AM CDT	River Flood Warning	MEG	Shelby	23 hr
Mar 27, 3:45 PM CDT	Special Weather Statement	MEG	Tipton	30 min
Mar 27, 3:50 PM CDT	Special Weather Statement	MEG	Madison	25 min
Mar 27, 4:05 PM CDT	Severe Thunderstorm Warning	MEG	Chester, Hardeman, Henderson, Madison	40 min
Mar 27, 4:15 PM CDT	Special Weather Statement	MEG	Lauderdale	30 min
Mar 27, 4:35 PM CDT	Tornado Warning	MEG	Chester, Decatur, Henderson	40 min
Mar 27, 5:05 PM CDT	Areal Flood Advisory	MEG	Chester, Henderson, Madison	3 hr
Mar 27, 5:08 PM CDT	Tornado Warning	MEG	Decatur, Henderson	22 min
Mar 27, 5:42 PM CDT	Tornado Warning	MEG	Lauderdale	48 min
Mar 27, 6:23 PM CDT	Tornado Warning Tornado observed	MEG	Lauderdale	52 min

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.