Alert archive / Tennessee / Flash Flood Warnings in 2021
Flash Flood Warning 40, NWS Morristown, TN
NWS Morristown, TN issued this flash flood warning at Sep 19, 2021, 5:33 PM EDT for Hamilton County, Marion County, Sequatchie 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
- Sep 19, 2021, 5:33 PM EDT (21:33 UTC)
- Expired
- Sep 19, 2021, 11:15 PM EDT
- In force
- 6 hr
- Issued by
- NWS Morristown, TN
- Area
- Storm-based polygon
- Flood severity
- None
Counties Hamilton County, TN, Marion County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 66 km from the middle of the area, began a volume at 21:35 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, 9.6 hours before the alert went out and 139 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
- 92 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 895 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
895
WGUS54 KMRX 192133
FFWMRX
TNC065-115-153-200130-
/O.NEW.KMRX.FF.W.0040.210919T2133Z-210920T0130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
533 PM EDT Sun Sep 19 2021
The National Weather Service in Morristown has issued a
* Flash Flood Warning for...
Southwestern Hamilton County in east Tennessee...
Eastern Marion County in east Tennessee...
Southern Sequatchie County in east Tennessee...
* Until 930 PM EDT /830 PM CDT/.
* At 533 PM EDT /433 PM CDT/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. This also comes after
recent heavy rainfall that has led to saturated grounds. Between
0.5 and 1 inch of rain has fallen. The expected rainfall rate is
0.5 to 1 inch in 1 hour. 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...
Chattanooga, Signal Mountain, Walden, Whitwell, Fairmount, Red
Bank, Powells Crossroads, Lone Oak, Cartwright, Martin Springs,
Hicks Gap State Park, Chimneys State Park, Falling Water, North
Chickamauga Creek Gorge, Griffith Creek, Lookout Mountain and East
Ridge.
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.
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.
&&
LAT...LON 3532 8556 3534 8554 3534 8553 3536 8551
3537 8551 3538 8550 3526 8528 3499 8527
3498 8547 3531 8562
FLASH FLOOD...RADAR INDICATED
EXPECTED RAINFALL...0.5-1 INCH IN 1 HOUR
$$
BW2 follow-up statements
680
WGUS54 KMRX 200114
FFWMRX
TNC065-115-153-200315-
/O.EXT.KMRX.FF.W.0040.000000T0000Z-210920T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Morristown TN
914 PM EDT Sun Sep 19 2021
The National Weather Service in Morristown has extended the
* Flash Flood Warning for...
Southwestern Hamilton County in east Tennessee...
Eastern Marion County in east Tennessee...
Southern Sequatchie County in east Tennessee...
* Until 1115 PM EDT /1015 PM CDT/.
* At 914 PM EDT /814 PM CDT/, Doppler radar indicated thunderstorms
producing heavy rain across the warned area. This comes after
heavy rainfall and flooding from yesterday. Between 0.5 and 1.5
inches of rain have fallen with additional light amounts expected.
Flash flooding is ongoing or expected to begin shortly due to
runoff from this evening's rainfall and an already saturated
ground.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Chattanooga, Signal Mountain, Walden, Whitwell, Fairmount, Red
Bank, Powells Crossroads, Lone Oak, Cartwright, Martin Springs,
Hicks Gap State Park, Chimneys State Park, Falling Water, North
Chickamauga Creek Gorge, Griffith Creek, Lookout Mountain and East
Ridge.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
In hilly terrain there are hundreds of low water crossings which are
potentially dangerous in heavy rain. Do not attempt to cross flooded
roads. Find an alternate route.
&&
LAT...LON 3532 8556 3534 8554 3534 8553 3536 8551
3537 8551 3538 8550 3526 8528 3499 8527
3498 8547 3531 8562
FLASH FLOOD...RADAR INDICATED
$$
BW389
WGUS74 KMRX 200320
FFSMRX
Flash Flood Statement
National Weather Service Morristown TN
1020 PM CDT Sun Sep 19 2021
TNC115-153-200330-
/O.EXP.KMRX.FF.W.0040.000000T0000Z-210920T0315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Marion TN-Sequatchie TN-
1020 PM CDT Sun Sep 19 2021
...FLASH FLOOD WARNING HAS EXPIRED FOR SOUTHWESTERN HAMILTON,
EASTERN MARION AND SOUTHERN SEQUATCHIE COUNTIES...
A Flood Warning remains in effect for southwestern Hamilton County
until 900 AM EDT.
A Flash Flood Watch remains in effect until 700 PM CDT Monday for A
portion of east Tennessee.
LAT...LON 3532 8556 3534 8554 3534 8553 3536 8551
3537 8551 3538 8550 3526 8528 3499 8527
3498 8547 3531 8562
$$
BWThe office that day
Everything else NWS Morristown, TN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 19, 3:12 AM EDT | Flash Flood Watch | MRX | Bledsoe, Bradley, Hamilton, Marion, Meigs, Rhea and 1 more | 47 hr |
| Sep 19, 10:19 AM EDT | Areal Flood Advisory | MRX | Hamilton, Marion, Sequatchie | 3 hr |
| Sep 19, 3:36 PM EDT | Special Weather Statement | MRX | Sevier | 39 min |
| Sep 19, 3:59 PM EDT | Special Weather Statement | MRX | Hamblen, Jefferson | 46 min |
| Sep 19, 4:19 PM EDT | Areal Flood Advisory | MRX | Hamilton, Marion, Sequatchie | 3 hr |
| Sep 19, 7:14 PM EDT | Flash Flood Warning | MRX | Hamilton | 4 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.