Alert archive / Tennessee / Flash Flood Warnings in 2026
Flash Flood Warning 9, NWS Morristown, TN
NWS Morristown, TN issued this flash flood warning at May 30, 2026, 3:46 AM EDT for Greene County, Tennessee. It was in force for 6 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
- May 30, 2026, 3:46 AM EDT (07:46 UTC)
- Expired
- May 30, 2026, 10:00 AM EDT
- In force
- 6 hr
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Flood severity
- None
County Greene County, TN
The radar
The Knoxville radar (KMRX), 67 km from the middle of the area, began a volume at 07:46 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Greensboro/Hi Pt, NC (KGSO), launched 00:00Z, 7.8 hours before the alert went out and 248 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1932 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- 38 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
290
WGUS54 KMRX 300746
FFWMRX
TNC059-301145-
/O.NEW.KMRX.FF.W.0009.260530T0746Z-260530T1145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
346 AM EDT Sat May 30 2026
The National Weather Service in Morristown has issued a
* Flash Flood Warning for...
East Central Greene County in east Tennessee...
* Until 745 AM EDT.
* At 346 AM EDT, Emergency management reported Flash Flooding was
ongoing in Horse Creek Recreation Area and areas immediately
downstream along Horse Creek. While no rain is occurring at the
moment, radar estimates upwards of 2 inches fell between Midnight
and 2 AM EDT in far southeast Greene County.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management 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...
mainly rural areas of East Central Greene County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3613 8264 3609 8259 3605 8262 3606 8262
3607 8263 3607 8264 3606 8265 3605 8267
3605 8268 3604 8269 3603 8271 3607 8274
3610 8272 3615 8271 3618 8269 3618 8266
FLASH FLOOD...OBSERVED
$$
CD1 follow-up statement
000
WGUS54 KMRX 301126
FFWMRX
TNC059-301400-
/O.EXT.KMRX.FF.W.0009.000000T0000Z-260530T1400Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
726 AM EDT Sat May 30 2026
The National Weather Service in Morristown has extended the
* Flash Flood Warning for...
East Central Greene County in east Tennessee...
* Until 1000 AM EDT.
* At 726 AM EDT, Emergency management reports that several roads are
still flooded and impassable while a few others have high waters
adjacent to the road surface. Light to moderate rain is expected
to impact the warned area, which received upwards of 5 inches of
rain overnight, over the next hour or two. As such, flooding is
likely to continue and the warning has been extended.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Emergency management reported.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of East Central Greene County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3613 8264 3609 8259 3605 8262 3606 8262
3607 8263 3607 8264 3606 8265 3605 8267
3605 8268 3604 8269 3603 8271 3607 8274
3610 8272 3615 8271 3618 8269 3618 8266
FLASH FLOOD...OBSERVED
$$
CDWhat forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Morristown, TN wrote its last area forecast discussion before this flash flood warning went out at May 30, 1:37 AM EDT, 2 hours 9 minutes earlier. Its key messages:
- Updated at 124 AM EDT Sat May 30 2026
- Periods of showers/storms continue through Saturday morning, some of which may produce heavy rainfall and flooding.
- A drier weather pattern develops next week.
Area forecast discussion, May 30, 1:37 AM EDT, 2 hours 9 minutes before
Area Forecast Discussion
National Weather Service Morristown TN
137 AM EDT Sat May 30 2026
...New DISCUSSION, AVIATION...
.KEY MESSAGES...
Updated at 124 AM EDT Sat May 30 2026
- Periods of showers/storms continue through Saturday morning,
some of which may produce heavy rainfall and flooding.
- A drier weather pattern develops next week.
&&
.DISCUSSION...
Issued at 124 AM EDT Sat May 30 2026
Water vapor imagery shows a mid/upper low spinning over Middle/West
TN, with a negatively-tilted trough extending SE across AL/GA.
This is producing upper divergence over East TN, which will
maintain convective activity through the night in a moist air mass
of PW values near 2 inches. The HRRR shows showers and storms
increasing in coverage and intensity later tonight, around 09Z in
the northern and central TN Valley, between TYS and TRI. Rain
rates of 1-3 inches per hour will be possible where storms move
slowly or train over the same locations. Flash flooding will
continue to be a concern, especially for areas that had heavy rain
this afternoon, such as Blount/Sevier counties and
Morgan/Scott/Campbell counties. The Flood Watch will continue.
Through Saturday morning, precip will shift southward as the large
closed low over New England moves south and establishes a NW flow
across the region. This will bring drier air into the area that will
keep dry conditions into Sunday. Chance PoPs return late Sunday with
a weak shortwave trough in the NW flow. Another disturbance in the
NW flow and a southward-moving cold front brings better rain chances
on Monday.
Drier air and high pressure will move in behind the front, setting
up a drier period for Tuesday through at least Thursday, along with
temperatures near seasonal normals. Rain chances may tick back up
by Friday as moisture begins to increase again.
&&
.AVIATION...
(06Z TAFS)
Issued at 124 AM EDT Sat May 30 2026
Guidance continues to indicate a possibility of SHRA and embedded
TSRA at various times through the forecast period. Have PROB30
groups in for the most probable times for convection affecting
terminals however. In between periods of convection, MVFR CIGS
will be possible. By midday or early afternoon, northerly flow
will begin to move in, with drier air and decreasing rain chances
following by the evening.
&&
.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN 84 66 80 64 / 70 10 40 50
Knoxville McGhee Tyson Airport, TN 81 61 82 63 / 80 10 50 60
Oak Ridge, TN 81 60 81 63 / 70 0 50 60
Tri Cities Airport, TN 83 56 82 60 / 40 0 10 70
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...Flood Watch through this afternoon for Cherokee-Clay.
TN...Flood Watch through this afternoon for Anderson-Bledsoe-Blount
Smoky Mountains-Bradley-Campbell-Claiborne-Cocke Smoky
Mountains-East Polk-Grainger-Hamblen-Hamilton-Hancock-
Hawkins-Jefferson-Knox-Loudon-Marion-McMinn-Meigs-Morgan-
North Sevier-Northwest Blount-Northwest Cocke-Northwest
Greene-Northwest Monroe-Rhea-Roane-Scott TN-Sequatchie-
Sevier Smoky Mountains-Southeast Greene-Southeast Monroe-
Unicoi-Union-Washington TN-West Polk.
VA...NONE.
&&
DISCUSSION...CD
AVIATION...CDHazardous weather outlook, May 29, 2:13 PM EDT, 13 hours 33 minutes before
Hazardous Weather Outlook National Weather Service Morristown TN 213 PM EDT Fri May 29 2026 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-301815- Cherokee-Clay-Scott TN-Campbell-Claiborne-Hancock-Hawkins- Sullivan-Johnson-Morgan-Anderson-Union-Grainger-Hamblen- Northwest Cocke-Cocke Smoky Mountains-Northwest Greene- Southeast Greene-Washington TN-Unicoi-Northwest Carter- Southeast Carter-Roane-Loudon-Knox-Jefferson-Northwest Blount- Blount Smoky Mountains-North Sevier-Sevier Smoky Mountains- Sequatchie-Bledsoe-Rhea-Meigs-McMinn-Northwest Monroe- Southeast Monroe-Marion-Hamilton-Bradley-West Polk-East Polk-Lee- Wise-Scott VA-Russell-Washington VA- 213 PM EDT Fri May 29 2026 /113 PM CDT Fri May 29 2026/ This Hazardous Weather Outlook is for portions of southwest North Carolina...east Tennessee and southwest Virginia. .DAY ONE...This Afternoon and Tonight Showers and scattered thunderstorms, some with very heavy rainfall, will occur this afternoon and especially tonight. Areas that see repeated or prolonged periods of heavy rain will be at risk for flash flooding. .DAYS TWO THROUGH SEVEN...Saturday through Thursday The threat of very heavy rainfall and possible flash flooding will continue into Saturday before diminishing later in the day. .SPOTTER INFORMATION STATEMENT... Any reports of flooding through Saturday will be appreciated.
In the hours before
Local storm report, May 29, 11:20 PM EDT, 4 hours 26 minutes before
Preliminary Local Storm Report
National Weather Service Morristown TN
1120 PM EDT Fri May 29 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0921 PM Flash Flood 2 ESE Clover Hill 35.70N 84.04W
05/29/2026 Blount TN Law Enforcement
The right lane of US Hwy 411 South by
Ridgeway Trail closed for flooding over
roadway.
&&
NAWThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 8:59 PM EDT | Flash Flood Warning | MRX | Blount | 4 hr |
| May 30, 2:06 AM EDT | Areal Flood Advisory | MRX | Greene, Unicoi, Washington | 3 hr |
| May 30, 4:09 AM EDT | Areal Flood Advisory | MRX | Anderson, Morgan | 3 hr |
| May 30, 4:25 AM EDT | Flash Flood Warning | MRX | Anderson, Morgan | 6 hr |
| May 30, 5:08 AM EDT | Flash Flood Warning | MRX | Anderson, Campbell, Morgan, Scott | 7 hr |
| May 30, 5:49 AM EDT | Flash Flood Warning | MRX | McMinn | 4 hr |
| May 30, 6:04 AM EDT | Areal Flood Advisory | MRX | Knox | 6 hr |
| May 30, 6:49 AM EDT | Areal Flood Advisory | MRX | Campbell, Morgan, Scott | 5 hr |
| May 30, 6:51 AM EDT | Areal Flood Advisory | MRX | Cocke, Jefferson, Sevier | 6 hr |
| May 30, 6:56 AM EDT | Areal Flood Advisory | MRX | Blount, Loudon | 3 hr |
| May 30, 7:58 AM EDT | Areal Flood Advisory | MRX | Blount | 6 hr |
| May 30, 8:25 AM EDT | Areal Flood Advisory | MRX | Anderson, Blount, Knox, Loudon, Roane | 3 hr |
| May 30, 8:49 AM EDT | Flash Flood Warning | MRX | Morgan | 4 hr |
| May 30, 9:28 AM EDT | Flash Flood Warning | MRX | Blount, Loudon | 3 hr |
| May 30, 10:03 AM EDT | Areal Flood Advisory | MRX | Blount, Loudon, Monroe | 3 hr |
| May 30, 10:06 AM EDT | Areal Flood Advisory | MRX | Anderson, Morgan | 3 hr |
| May 30, 10:10 AM EDT | Areal Flood Advisory | MRX | McMinn | 3 hr |
| May 30, 12:14 PM EDT | Areal Flood Advisory | MRX | Blount, Loudon | 76 min |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.