Alert archive / Tennessee / Flash Flood Warnings in 2021

Flash Flood Warning 32, NWS Morristown, TN

July 26, 20216 counties in Tennessee

NWS Morristown, TN issued this flash flood warning at Jul 26, 2021, 3:37 PM CDT for 6 counties in Tennessee. It was in force for 68 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 26, 2021, 3:37 PM CDT (20:37 UTC)
Expired: Jul 26, 2021, 4:45 PM CDT
In force: 68 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, McMinn County, TN, Meigs County, TN, Rhea County, TN

The radar

The Northeast Alabama radar (KHTX), 127 km from the middle of the area, began a volume at 20:40 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.

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 8.6 hours before the alert went out and 164 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: 1186 J/kg
Mixed-layer CIN: -54 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: -6 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

160 
WGUS54 KMRX 262037
FFWMRX
TNC007-011-065-107-121-143-262145-
/O.NEW.KMRX.FF.W.0032.210726T2037Z-210726T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
337 PM CDT Mon Jul 26 2021

The National Weather Service in Morristown has issued a

* Flash Flood Warning for...
  Northeastern Bledsoe County in east Tennessee...
  Northeastern Bradley County in east Tennessee...
  Northeastern Hamilton County in east Tennessee...
  Southwestern McMinn County in east Tennessee...
  Southwestern Meigs County in east Tennessee...
  Rhea County in east Tennessee...

* Until 445 PM CDT /545 PM EDT/.

* At 337 PM CDT /437 PM EDT/, 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...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...
  Dayton, Decatur, Spring City, Charleston, Graysville, Calhoun, Old 
  Washington, Evensville, Big Spring, Hillsview, Birchwood, Sale 
  Creek, Stinging Fork Falls State Park, Piney Falls State Park, 
  Riceville, Grandview and Melvine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3560 8513 3576 8508 3577 8504 3575 8503
      3577 8493 3576 8492 3577 8491 3579 8487
      3572 8482 3552 8476 3544 8465 3535 8462
      3526 8468 3526 8484 3532 8496 3532 8506
      3534 8512

FLASH FLOOD...RADAR INDICATED

$$

McD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 7:08 PM CDT	Areal Flood Advisory	MRX	Sequatchie	52 min
Jul 26, 12:14 PM CDT	Special Weather Statement	MRX	Claiborne, Hancock, Hawkins	46 min
Jul 26, 12:26 PM CDT	Special Weather Statement	MRX	Campbell	49 min
Jul 26, 12:40 PM CDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	50 min
Jul 26, 1:05 PM CDT	Special Weather Statement	MRX	Anderson, Campbell	40 min
Jul 26, 1:10 PM CDT	Special Weather Statement	MRX	Grainger, Hamblen	50 min
Jul 26, 1:45 PM CDT	Special Weather Statement	MRX	Sevier	45 min
Jul 26, 1:47 PM CDT	Special Weather Statement	MRX	Anderson, Knox	43 min
Jul 26, 2:07 PM CDT	Special Weather Statement	MRX	Cocke	38 min
Jul 26, 2:45 PM CDT	Special Weather Statement	MRX	Meigs, Rhea	45 min
Jul 26, 2:54 PM CDT	Special Weather Statement	MRX	Rhea	51 min
Jul 26, 3:07 PM CDT	Special Weather Statement	MRX	Scott	38 min
Jul 26, 3:25 PM CDT	Special Weather Statement	MRX	Marion	50 min
Jul 26, 3:27 PM CDT	Special Weather Statement	MRX	Meigs, Rhea	48 min
Jul 26, 3:57 PM CDT	Special Weather Statement	MRX	McMinn	48 min
Jul 26, 4:38 PM CDT	Special Weather Statement	MRX	Hamilton	52 min
Jul 26, 4:45 PM CDT	Special Weather Statement	MRX	Polk	45 min
Jul 26, 5:24 PM CDT	Special Weather Statement	MRX	Rhea	51 min
Jul 26, 6:29 PM CDT	Special Weather Statement	MRX	Sequatchie	31 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.