Alert archive / Tennessee / Flash Flood Warnings in 2020

Flash Flood Warning 21, NWS Morristown, TN

August 6, 2020Bledsoe County, Rhea County, Tennessee

NWS Morristown, TN issued this flash flood warning at Aug 6, 2020, 12:11 PM CDT for Bledsoe County, Rhea County, Tennessee. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 6, 2020, 12:11 PM CDT (17:11 UTC)
Expired: Aug 6, 2020, 3:15 PM CDT
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Bledsoe County, TN, Rhea County, TN

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 12:00Z, 5.2 hours before the alert went out and 154 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: 11 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 1037 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

179 
WGUS54 KMRX 061711
FFWMRX
TNC007-143-062015-
/O.NEW.KMRX.FF.W.0021.200806T1711Z-200806T2015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
1211 PM CDT Thu Aug 6 2020

The National Weather Service in Morristown has issued a

* Flash Flood Warning for...
  Northeastern Bledsoe County in east Tennessee...
  Central Rhea County in east Tennessee...

* Until 315 PM CDT /415 PM EDT/.

* At 1211 PM CDT /111 PM EDT/, Doppler radar indicated thunderstorms 
  producing heavy rain across the warned area. Between 2.5 and 3.5 
  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...
  Spring City, Stinging Fork Falls State Park and Piney Falls State 
  Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In hilly terrain there are hundreds of low water crossings which are 
potentially dangerous in heavy rain. Do not attempt to cross flooded 
roads. Find an alternate route.

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 3558 8512 3565 8508 3570 8501 3570 8498
      3570 8497 3574 8491 3570 8481 3560 8493
      3556 8508

FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR 

$$

SR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 5, 7:28 PM CDT	Special Weather Statement	MRX	Claiborne	47 min
Aug 5, 7:52 PM CDT	Special Weather Statement	MRX	Claiborne	38 min
Aug 6, 9:41 AM CDT	Areal Flood Advisory	MRX	Bledsoe, Rhea	4 hr
Aug 6, 11:25 AM CDT	Areal Flood Advisory	MRX	Rhea, Roane	3 hr
Aug 6, 12:24 PM CDT	Special Weather Statement	MRX	Knox	51 min
Aug 6, 12:30 PM CDT	Special Weather Statement	MRX	Bledsoe	45 min
Aug 6, 1:00 PM CDT	Areal Flood Advisory	MRX	Bledsoe, Hamilton, Sequatchie	3 hr
Aug 6, 1:38 PM CDT	Special Weather Statement	MRX	Bradley	52 min
Aug 6, 1:44 PM CDT	Special Weather Statement	MRX	Sevier	46 min
Aug 6, 2:20 PM CDT	Special Weather Statement	MRX	Sullivan	40 min
Aug 6, 2:47 PM CDT	Special Weather Statement	MRX	Cocke	43 min
Aug 6, 3:20 PM CDT	Special Weather Statement	MRX	Greene	40 min
Aug 6, 3:26 PM CDT	Areal Flood Advisory	MRX	Greene, Unicoi, Washington	3 hr
Aug 6, 4:12 PM CDT	Special Weather Statement	MRX	Polk	48 min
Aug 6, 4:22 PM CDT	Special Weather Statement	MRX	Cocke	53 min
Aug 6, 4:48 PM CDT	Severe Thunderstorm Warning	MRX	Cocke	42 min
Aug 6, 4:54 PM CDT	Areal Flood Advisory	MRX	Cocke	3 hr
Aug 6, 5:03 PM CDT	Areal Flood Advisory	MRX	Blount, Sevier	117 min
Aug 6, 5:14 PM CDT	Special Weather Statement	MRX	Greene	46 min
Aug 6, 5:34 PM CDT	Special Weather Statement	MRX	Monroe	41 min
Aug 6, 5:46 PM CDT	Areal Flood Advisory	MRX	Cocke, Greene	119 min
Aug 6, 5:52 PM CDT	Special Weather Statement	MRX	Greene	53 min
Aug 6, 6:45 PM CDT	Special Weather Statement	MRX	Union	45 min

Nearby

Flash Flood Warnings in Tennessee, 2020 Every flash flood warning in 2020

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.