Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 43, NWS Morristown, TN

October 6, 2021Bledsoe County, Sequatchie County, Tennessee

NWS Morristown, TN issued this flash flood warning at Oct 6, 2021, 3:32 PM CDT for Bledsoe County, Sequatchie County, Tennessee. It was in force for 9 hr. 2 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
Oct 6, 2021, 3:32 PM CDT (20:32 UTC)
Expired
Oct 7, 2021, 1:00 AM CDT
In force
9 hr
Issued by
NWS Morristown, TN
Area
Storm-based polygon
Flood severity
None

Counties Bledsoe County, TN, Sequatchie County, TN

The radar

The Northeast Alabama radar (KHTX), 84 km from the middle of the area, began a volume at 20:33 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

TimeReportWhereRemark
Oct 6, 6:20 PM CDTFLASH FLOOD3 Nne Dunlap, TNDISPATCH REPORTS NUMEROUS ROADS CLOSED ACROSS THE COUNTY. EVACUATIONS UNDER WAY ALONG BRANCH RD.
Oct 6, 11:10 PM CDTHEAVY RAIN 6.256 Nnw Dunlap, TN6.25 INCHES OF RAIN MEASURED BETWEEN ROUGHLY NOON AND MIDNIGHT.

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, 8.5 hours before the alert went out and 131 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-pSkew-T log-p diagram, Nashville Metro, TN at 12:00Z on 2021-10-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Nashville Metro, TN at 12:00Z on 2021-10-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -65 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1243 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
-65 m²/s²
0-3 km storm-relative helicity
-2 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

110 
WGUS54 KMRX 062032
FFWMRX
TNC007-153-070600-
/O.NEW.KMRX.FF.W.0043.211006T2032Z-211007T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
332 PM CDT Wed Oct 6 2021

The National Weather Service in Morristown has issued a

* Flash Flood Warning for...
  Bledsoe County in east Tennessee...
  Sequatchie County in east Tennessee...

* Until 100 AM CDT Thursday.

* At 332 PM CDT, local law enforcement reported thunderstorms 
  producing heavy rain across the warned area. Between 1 and 3 
  inches of rain have fallen over a short period of time. Flash 
  flooding is ongoing or expected later this evening after several 
  more rounds of rain.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Law enforcement 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...
  Dunlap, Pikeville, Palio, Old Cumberland, Cagle, Brayton, Fall 
  Creek Falls State Park, Mount Crest, Cartwright, North Chickamauga 
  Creek Gorge and Lone Oak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3532 8525 3515 8539 3520 8539 3525 8543
      3531 8556 3534 8554 3536 8551 3541 8549
      3541 8551 3542 8551 3543 8554 3549 8554
      3553 8561 3555 8546 3557 8542 3569 8530
      3572 8527 3576 8527 3577 8516 3544 8518

FLASH FLOOD...OBSERVED

$$

19
2 follow-up statements
001 
WGUS74 KMRX 062320
FFSMRX

Flash Flood Statement
National Weather Service Morristown TN
620 PM CDT Wed Oct 6 2021

TNC007-153-070600-
/O.CON.KMRX.FF.W.0043.000000T0000Z-211007T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bledsoe TN-Sequatchie TN-
620 PM CDT Wed Oct 6 2021

...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1 AM CDT THURSDAY FOR 
BLEDSOE AND SEQUATCHIE COUNTIES...

At 620 PM CDT, local law enforcement reported flooding and heavy 
rain across the warned area. Between 1 and 4 inches of rain have 
fallen today, and more rain is expected this evening and tonight. 
Several roads are closed across the counties, avoid driving around 
flooded areas tonight.

HAZARD...Flash flooding caused by thunderstorms.

SOURCE...Law enforcement 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...
  Dunlap, Pikeville, Palio, Old Cumberland, Cagle, Brayton, Fall 
  Creek Falls State Park, Mount Crest, Cartwright, North Chickamauga 
  Creek Gorge and Lone Oak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Be aware of your surroundings and do not drive on flooded roads.

&&

LAT...LON 3532 8525 3515 8539 3520 8539 3525 8543
      3531 8556 3534 8554 3536 8551 3541 8549
      3541 8551 3542 8551 3543 8554 3549 8554
      3553 8561 3555 8546 3557 8542 3569 8530
      3572 8527 3576 8527 3577 8516 3544 8518

FLASH FLOOD...OBSERVED

$$

19
721 
WGUS74 KMRX 070551
FFSMRX

Flash Flood Statement
National Weather Service Morristown TN
1251 AM CDT Thu Oct 7 2021

TNC007-153-070601-
/O.EXP.KMRX.FF.W.0043.000000T0000Z-211007T0600Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Bledsoe TN-Sequatchie TN-
1251 AM CDT Thu Oct 7 2021

...FLASH FLOOD WARNING WILL EXPIRE AT 1 AM CDT EARLY THIS MORNING 
FOR BLEDSOE AND SEQUATCHIE COUNTIES...

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

A Flash Flood Watch remains in effect until 700 AM CDT Thursday for 
portions of southwest North Carolina. portions of east Tennessee.

LAT...LON 3532 8525 3515 8539 3520 8539 3525 8543
      3531 8556 3534 8554 3536 8551 3541 8549
      3541 8551 3542 8551 3543 8554 3549 8554
      3553 8561 3555 8546 3557 8542 3569 8530
      3572 8527 3576 8527 3577 8516 3544 8518

$$

CD

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 8:35 AM CDTSpecial Weather StatementMRXMarion25 min
Oct 6, 9:17 AM CDTAreal Flood AdvisoryMRXMarion2 hr
Oct 6, 10:13 AM CDTAreal Flood AdvisoryMRXMarion, Sequatchie102 min
Oct 6, 12:02 PM CDTAreal Flood AdvisoryMRXBledsoe, Hamilton, Sequatchie3 hr
Oct 6, 2:59 PM CDTAreal Flood AdvisoryMRXBledsoe, Hamilton, Marion, Sequatchie3 hr
Oct 6, 4:44 PM CDTSpecial Weather StatementMRXBledsoe46 min
Oct 6, 4:47 PM CDTTornado WarningMRXBledsoe29 min

Nearby

Flash Flood Warnings in Tennessee, 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.