Alert archive / Tennessee / Flash Flood Warnings in 2026
Flash Flood Warning 21, NWS Morristown, TN
NWS Morristown, TN issued this flash flood warning at Jun 28, 2026, 4:03 AM EDT for 4 counties in Tennessee. It was in force for 3 hr. 4 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
- Jun 28, 2026, 4:03 AM EDT (08:03 UTC)
- Expired
- Jun 28, 2026, 7:00 AM EDT
- In force
- 3 hr
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Anderson County, TN, Knox County, TN, Morgan County, TN, Roane County, TN
The radar
The Knoxville radar (KMRX), 74 km from the middle of the area, began a volume at 08:04 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 |
|---|---|---|---|
| Jun 28, 4:22 AM EDT | FLASH FLOOD | 1 Ssw Karns, TN | High water reported at Karns Underpass near Ball Camp Byington Rd and Byington Solway Rd. |
| Jun 28, 4:37 AM EDT | FLASH FLOOD | 4 Sse Karns, TN | THP report of about 3 feet of running water near N Cedar Bluff Rd and Executive Park Dr. |
| Jun 28, 5:06 AM EDT | FLASH FLOOD | 1 Wsw Bearden, TN | Roadway flooded near Lockett Rd and Deane Hill Dr. |
| Jun 28, 5:09 AM EDT | FLASH FLOOD | 3 Wsw Bearden, TN | Roadway flooded on Downtown W Blvd just north of Gleason Dr NW. |
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, 8.1 hours before the alert went out and 215 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.
- Mixed-layer CAPE
- 1964 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 986 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 202 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.9
The text
As transmitted.
672
WGUS54 KMRX 280803
FFWMRX
TNC001-093-129-145-281100-
/O.NEW.KMRX.FF.W.0021.260628T0803Z-260628T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
403 AM EDT Sun Jun 28 2026
The National Weather Service in Morristown has issued a
* Flash Flood Warning for...
Anderson County in east Tennessee...
Knox County in east Tennessee...
East Central Morgan County in east Tennessee...
Northeastern Roane County in east Tennessee...
* Until 700 AM EDT.
* At 403 AM EDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. Additional rainfall amounts of 1 to 2 inches are
possible in the warned area. 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...
Knoxville, Oak Ridge, Clinton, Farragut, Oliver Springs,
Louisville, Halls, Rocky Top, Norris, Karns, Powell, Bearden,
Rosedale, Coalfield, Maloneyville, Petros, Mascot and Frozen Head
State Park.
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 3620 8436 3622 8430 3618 8424 3624 8423
3605 8370 3583 8412 3585 8414 3583 8413
3581 8416 3609 8453
FLASH FLOOD...RADAR INDICATED
$$
DGS2 follow-up statements
067
WGUS74 KMRX 280910
FFSMRX
Flash Flood Statement
National Weather Service Morristown TN
510 AM EDT Sun Jun 28 2026
TNC001-129-145-280920-
/O.CAN.KMRX.FF.W.0021.000000T0000Z-260628T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Anderson TN-Morgan TN-Roane TN-
510 AM EDT Sun Jun 28 2026
...FLASH FLOOD WARNING IS CANCELLED FOR ANDERSON, EAST CENTRAL
MORGAN AND NORTHEASTERN ROANE COUNTIES...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flood Watch remains in effect until 1100 AM EDT for portions of
east Tennessee and southwest Virginia.
&&
LAT...LON 3583 8412 3585 8413 3585 8414 3583 8414
3581 8416 3591 8427 3592 8425 3594 8427
3593 8424 3595 8425 3595 8421 3596 8422
3598 8421 3598 8420 3599 8419 3599 8415
3604 8406 3607 8409 3615 8399 3605 8370
$$
TNC093-281100-
/O.CON.KMRX.FF.W.0021.000000T0000Z-260628T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox TN-
510 AM EDT Sun Jun 28 2026
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 7 AM EDT THIS MORNING
FOR KNOX COUNTY...
At 510 AM EDT, local law enforcement reported flash flooding in Road
flooding was reported across southern Knox County. Flooding impacts
will continue, but no additional rainfall is expected. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by heavy rain.
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...
Knoxville, Oak Ridge, Farragut, Louisville, Halls, Powell,
Bearden, Karns, Maloneyville and Mascot.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3583 8412 3585 8413 3585 8414 3583 8414
3581 8416 3591 8427 3592 8425 3594 8427
3593 8424 3595 8425 3595 8421 3596 8422
3598 8421 3598 8420 3599 8419 3599 8415
3604 8406 3607 8409 3615 8399 3605 8370
FLASH FLOOD...OBSERVED
$$
DGS766
WGUS74 KMRX 281050
FFSMRX
Flash Flood Statement
National Weather Service Morristown TN
650 AM EDT Sun Jun 28 2026
TNC093-281100-
/O.EXP.KMRX.FF.W.0021.000000T0000Z-260628T1100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Knox TN-
650 AM EDT Sun Jun 28 2026
...FLASH FLOOD WARNING WILL EXPIRE AT 7 AM EDT THIS MORNING FOR KNOX
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures. If more
heavy rain occurs additional flash flood warnings may be issued.
A Flood Watch remains in effect until 1100 AM EDT for portions of
east Tennessee and southwest Virginia.
&&
LAT...LON 3583 8412 3585 8413 3585 8414 3583 8414
3581 8416 3591 8427 3592 8425 3594 8427
3593 8424 3595 8425 3595 8421 3596 8422
3598 8421 3598 8420 3599 8419 3599 8415
3604 8406 3607 8409 3615 8399 3605 8370
$$
19The office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 27, 10:58 PM EDT | Special Weather Statement | MRX | Morgan, Scott | 47 min |
| Jun 28, 1:18 AM EDT | Flash Flood Warning | MRX | Greene, Hancock, Hawkins, Sullivan, Washington | 3 hr |
| Jun 28, 5:22 AM EDT | Flash Flood Warning | MRX | Campbell, Claiborne, Scott | 8 hr |
| Jun 28, 6:43 AM EDT | Areal Flood Advisory | MRX | Greene | 3 hr |
| Jun 28, 6:54 AM EDT | Areal Flood Advisory | MRX | Blount, Knox, Sevier | 2 hr |
| Jun 28, 9:08 AM EDT | Flash Flood Warning | MRX | Anderson, Campbell, Grainger, Jefferson, Knox, Sevier and 1 more | 5 hr |
| Jun 28, 9:29 AM EDT | Areal Flood Advisory | MRX | Cocke, Jefferson, Sevier | 117 min |
| Jun 28, 10:06 AM EDT | Areal Flood Advisory | MRX | Morgan, Scott | 4 hr |
| Jun 28, 10:40 AM EDT | Special Weather Statement | MRX | Blount, Knox, Loudon, Roane, Sevier | 65 min |
| Jun 28, 11:19 AM EDT | Areal Flood Advisory | MRX | Anderson, Blount, Knox, Loudon, Roane | 3 hr |
| Jun 28, 11:26 AM EDT | Flash Flood Warning | MRX | Cocke, Jefferson, Sevier | 2 hr |
| Jun 28, 12:03 PM EDT | Special Weather Statement | MRX | Monroe | 27 min |
| Jun 28, 1:39 PM EDT | Areal Flood Advisory | MRX | Campbell, Claiborne, Scott | 2 hr |
| Jun 28, 1:40 PM EDT | Areal Flood Advisory | MRX | Anderson, Campbell, Grainger, Jefferson, Knox, Sevier and 1 more | 2 hr |
| Jun 28, 1:54 PM EDT | Areal Flood Advisory | MRX | Cocke, Jefferson, Sevier | 3 hr |
Nearby
Flash Flood Warnings in Tennessee, 2026Every flash flood warning in 2026
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.