Alert archive / Tennessee / Flash Flood Warnings in 2024

Flash Flood Warning 33, NWS Morristown, TN

September 25, 2024Blount County, Monroe County, Tennessee

NWS Morristown, TN issued this flash flood warning at Sep 25, 2024, 10:07 AM EDT for Blount County, Monroe County, Tennessee. It was in force for 5 hr. 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 25, 2024, 10:07 AM EDT (14:07 UTC)
Expired: Sep 25, 2024, 3:15 PM EDT
In force: 5 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Blount County, TN, Monroe County, TN

The radar

The Knoxville radar (KMRX), 91 km from the middle of the area, began a volume at 14:08 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, 2.1 hours before the alert went out and 235 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: 98 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 764 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: -11 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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 25, 10:07 AM EDT, 0 minutes earlier.

Area forecast discussion, Sep 25, 10:07 AM EDT, 0 minutes before

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Hazardous weather outlook, Sep 25, 3:56 AM EDT, 6 hours 11 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
356 AM EDT Wed Sep 25 2024

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-260800-
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-
356 AM EDT Wed Sep 25 2024 /256 AM CDT Wed Sep 25 2024/

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

.DAY ONE...Today and Tonight

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

Scattered showers and thunderstorms to continue this morning
before developing into more widespread rain showers and
thunderstorms this afternoon. A low risk of a strong to severe
wind gust and a nonzero risk for a tornado exists this morning to
the early afternoon today. Isolated to scattered instances of
flash flooding is possible today and tonight as thunderstorms
begin to move over increasingly saturated soils. A flood watch is
in effect this morning, see the watch for further details.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

...Tropical Storm Helene expected to impact the Tennessee Valley
and Southern Appalachians Late Week...

Moderate to heavy rainfall is expected Thursday across portions
of the area. Several inches of rainfall is expected today and
Thursday and this comes prior to any rainfall associated with the
passage of Tropical Storm Helene.

From late Thursday through Friday, Helene will move north into
the Tennessee valley and southern Appalachians. Confidence is
increasing on expected impacts. Heavy rain and strong, gusty
winds are likely. The highest winds are expected across the
higher elevations of the east TN, southwest VA, southwest NC
mountains, and Cumberland Plateau. Flooding will be a concern
areawide.

.SPOTTER INFORMATION STATEMENT...

Any reports of severe damage or flooding is very appreciated.

In the hours before

Special weather statement, Sep 25, 4:18 AM EDT, 5 hours 49 minutes before

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Special weather statement, Sep 25, 8:47 AM EDT, 1 hour 20 minutes before

Special Weather Statement
National Weather Service Morristown TN
847 AM EDT Wed Sep 25 2024

VAZ005-006-008-251330-
Washington VA-Scott VA-Russell VA-
847 AM EDT Wed Sep 25 2024

...A STRONG THUNDERSTORM WILL IMPACT RUSSELL...NORTHEASTERN SCOTT AND
NORTHWESTERN WASHINGTON COUNTIES THROUGH 930 AM EDT...

At 846 AM EDT, Doppler radar was tracking a strong thunderstorm 14
miles northeast of Gate City, moving northeast at 35 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Lebanon, Cleveland Va, St. Paul, Nickelsville, Dungannon,
Collingwood, Castlewood, and Hansonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3704 8208 3705 8206 3686 8188 3667 8241
      3681 8252 3688 8240 3689 8238 3690 8234
      3689 8234 3690 8233 3689 8232 3691 8232
      3691 8230 3694 8231 3704 8215 3704 8212
      3705 8211
TIME...MOT...LOC 1246Z 240DEG 29KT 3678 8238

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

CED

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 24, 8:37 PM EDT	Special Weather Statement	MRX	Johnson	53 min
Sep 25, 12:35 AM EDT	Areal Flood Advisory	MRX	Carter, Greene, Sullivan, Unicoi, Washington	3 hr
Sep 25, 1:15 AM EDT	Areal Flood Advisory	MRX	Carter, Johnson, Sullivan	3 hr
Sep 25, 9:23 AM EDT	Severe Thunderstorm Warning	MRX	Blount, Sevier	21 min
Sep 25, 11:10 AM EDT	Flash Flood Warning	MRX	Hancock, Hawkins	4 hr
Sep 25, 1:25 PM EDT	Flash Flood Warning	MRX	Blount, Monroe, Sevier	3 hr
Sep 25, 1:38 PM EDT	High Wind Watch	MRX	Anderson, Bledsoe, Blount, Bradley, Campbell, Carter and 27 more	23 hr
Sep 25, 2:31 PM EDT	River Flood Warning	MRX	Cocke, Jefferson	5 days
Sep 25, 2:34 PM EDT	River Flood Warning	MRX	Cocke	3 days
Sep 25, 2:50 PM EDT	Flash Flood Warning	MRX	Cocke, Greene, Sullivan, Washington	4 hr
Sep 25, 4:15 PM EDT	Flash Flood Warning	MRX	Cocke, Jefferson, Sevier	3 hr
Sep 25, 7:02 PM EDT	Flash Flood Warning	MRX	Cocke, Greene, Hamblen, Hawkins, Jefferson, Sevier and 3 more	3 hr
Sep 25, 7:08 PM EDT	Flash Flood Warning	MRX	Cocke, Jefferson, Sevier	3 hr
Sep 25, 2:57 AM EDT	Special Weather Statement	MRX	Wise, City of Norton	33 min
Sep 25, 4:18 AM EDT	Special Weather Statement	MRX	City of Norton	27 min
Sep 25, 8:47 AM EDT	Special Weather Statement	MRX	Russell	43 min
Sep 25, 11:48 AM EDT	Tropical Storm Watch	MRX	Cherokee, Clay	5 hr
Sep 25, 5:09 PM EDT	Tropical Storm Warning	MRX	Cherokee, Clay	45 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.