Alert archive / Tennessee / Flash Flood Warnings in 2024

Flash Flood Warning 52, NWS Morristown, TN

September 27, 2024Cocke County, Hamblen County, Jefferson County, Tennessee

NWS Morristown, TN issued this flash flood warning at Sep 27, 2024, 3:30 PM EDT for Cocke County, Hamblen County, Jefferson County, Tennessee. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Sep 27, 2024, 3:30 PM EDT (19:30 UTC)
Expired: Sep 27, 2024, 4:34 PM EDT
In force: 64 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Emergency: Flash flood emergency
Damage threat: Catastrophic
Flood severity: Unknown

Counties Cocke County, TN, Hamblen County, TN, Jefferson County, TN

The radar

The Knoxville radar (KMRX), 16 km from the middle of the area, began a volume at 19:14 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, 7.5 hours before the alert went out and 299 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 484 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 195 m²/s²
0-3 km storm-relative helicity: 269 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What 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 Sep 27, 1:22 PM EDT, 2 hours 8 minutes earlier.

Area forecast discussion, Sep 27, 1:22 PM EDT, 2 hours 8 minutes before

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Hazardous weather outlook, Sep 27, 3:43 AM EDT, 11 hours 47 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
343 AM EDT Fri Sep 27 2024

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-280745-
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-
343 AM EDT Fri Sep 27 2024 /243 AM CDT Fri Sep 27 2024/

This Hazardous Weather Outlook is for portions of southwest North
Carolina...east Tennessee and southwest Virginia.

.DAY ONE...Today and Tonight

...Remnants of Hurricane Helene expected to impact the Tennessee
Valley and Southern Appalachians Today...

...A Tropical Storm Warning is in effect for Cherokee and Clay
Counties in North Carolina through early afternoon...

...High Wind Warning in effect for all of East Tennessee and
southwest Virginia through this Evening...

...A Flood Watch is in Effect for Flash Flooding Across Portions
of East Tennessee, southwest Virginia, and southwest North
Carolina...

The remnants of Hurricane Helene will bring tropical downpours
mainly this morning. Flash flooding will be possible with an
additional 2 to 4 inches expected in some places.

In addition to the rain, strong winds are forecast. The highest
winds are expected across the higher elevations of the east TN,
southwest VA, southwest NC mountains, and Cumberland Plateau.
However strong pressure gradients will exist across the region and
thus the lower elevations of the Tennessee valley will likely
experience some high winds Friday morning. With soils incredibly
saturated, trees are likely to fall during this period of high
winds.

.DAYS THREE THROUGH SEVEN...Saturday through Wednesday

No additional hazardous weather is expected at this time.
Flood waters will be receding and may still pose a threat before
streams retreat back within their banks.

.SPOTTER INFORMATION STATEMENT...

Reports of wind damage or flooding is very appreciated.

In the hours before

Local storm report, Sep 27, 12:28 PM EDT, 3 hours 2 minutes before

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Local storm report, Sep 27, 12:29 PM EDT, 3 hours 1 minute before

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Local storm report, Sep 27, 12:47 PM EDT, 2 hours 43 minutes before

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Local storm report, Sep 27, 1:55 PM EDT, 1 hour 35 minutes before

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Local storm report, Sep 27, 1:59 PM EDT, 1 hour 31 minutes before

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Local storm report, Sep 27, 2:04 PM EDT, 1 hour 26 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 26, 11:52 PM EDT	Flash Flood Warning	MRX	Anderson, Blount, Bradley, Knox, Loudon, McMinn and 3 more	3 hr
Sep 27, 4:18 AM EDT	Areal Flood Advisory	MRX	Hamilton, Marion, Sequatchie	5 hr
Sep 27, 4:47 AM EDT	Areal Flood Warning	MRX	Blount, Cocke, Sevier	6 hr
Sep 27, 7:44 AM EDT	Flash Flood Warning	MRX	Hamilton, Marion, Sequatchie	4 hr
Sep 27, 8:50 AM EDT	Areal Flood Warning	MRX	Carter, Greene, Johnson, Unicoi	3 hr
Sep 27, 9:14 AM EDT	Flash Flood Warning EmergencyConsiderable damage threat	MRX	Carter, Unicoi	11 hr
Sep 27, 9:35 AM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Johnson	10 hr
Sep 27, 10:02 AM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Carter, Unicoi, Washington	7 hr
Sep 27, 10:36 AM EDT	Flash Flood Warning Considerable damage threat	MRX	Cocke, Sevier	7 hr
Sep 27, 11:01 AM EDT	River Flood Warning	MRX	Hamilton	22 hr
Sep 27, 11:26 AM EDT	River Flood Warning	MRX	Carter	15 hr
Sep 27, 12:02 PM EDT	River Flood Warning	MRX	Sevier	21 hr
Sep 27, 2:29 PM EDT	Wind Advisory	MRX	Blount, Carter, Cocke, Greene, Johnson, Monroe and 3 more	24 hr
Sep 27, 2:58 PM EDT	Flash Flood Warning	MRX	Hancock, Hawkins	2 hr
Sep 27, 4:54 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Carter, Greene, Johnson, Sullivan, Unicoi, Washington	3 hr
Sep 27, 6:01 PM EDT	Areal Flood Warning	MRX	Cocke, Greene, Jefferson, Sevier	16 hr
Sep 27, 6:25 PM EDT	Areal Flood Warning	MRX	Sullivan	16 hr
Sep 27, 7:29 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Johnson	6 hr
Sep 27, 7:38 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Carter, Johnson, Unicoi, Washington	6 hr
Sep 27, 7:50 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Carter, Sullivan, Unicoi, Washington	6 hr
Sep 27, 11:13 AM EDT	Flash Flood Warning	MRX	Russell, Scott, Washington, Wise, City of Bristol, City of Norton	4 hr
Sep 27, 2:43 PM EDT	Flash Flood Warning EmergencyCatastrophic damage threat	MRX	Washington, City of Bristol	5 hr

Nearby

Flash Flood Warnings in Tennessee, 2024 Every flash flood warning in 2024

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.