Alert archive / Tennessee / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 211, NWS Morristown, TN

September 4, 2025Blount County, Knox County, Sevier County, Tennessee

NWS Morristown, TN issued this severe thunderstorm warning at Sep 4, 2025, 1:52 PM EDT for Blount County, Knox County, Sevier County, Tennessee. It was in force for 41 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 4, 2025, 1:52 PM EDT (17:52 UTC)
Expired: Sep 4, 2025, 2:33 PM EDT
In force: 41 min
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Tornado: Possible
Hail: 1.25 in
Wind: 60.0 mph

Counties Blount County, TN, Knox County, TN, Sevier County, TN

The radar

The Knoxville radar (KMRX), 52 km from the middle of the area, began a volume at 17:52 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, 5.9 hours before the alert went out and 255 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: 1363 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 896 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 199 m²/s²
0-3 km storm-relative helicity: 194 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Sep 4, 1:11 PM EDT, 41 minutes earlier.

Area forecast discussion, Sep 4, 1:11 PM EDT, 41 minutes before

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Hazardous weather outlook, Sep 4, 1:15 PM EDT, 37 minutes before

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In the hours before

Special weather statement, Sep 4, 12:39 PM EDT, 1 hour 13 minutes before

Special Weather Statement
National Weather Service Morristown TN
1239 PM EDT Thu Sep 4 2025

TNZ017-018-046-VAZ008-041730-
Sullivan TN-Northwest Carter TN-Johnson TN-Washington VA-
1239 PM EDT Thu Sep 4 2025

...A STRONG THUNDERSTORM WILL IMPACT EASTERN SULLIVAN...JOHNSON...
NORTHEASTERN CARTER AND SOUTHEASTERN WASHINGTON COUNTIES AND THE
EASTERN CITY OF BRISTOL THROUGH 130 PM EDT...

At 1239 PM EDT, Doppler radar was tracking a strong thunderstorm near
Bristol Tn, moving east 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...
Bristol Tn, Bristol Va, Abingdon, Mountain City, Damascus, Laurel
Bloomery, Sadie, Shady Valley, South Holston Dam, and Hilander Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3662 8161 3661 8165 3659 8168 3657 8168
      3653 8171 3647 8170 3646 8171 3642 8172
      3641 8174 3640 8174 3641 8221 3667 8214
      3678 8169 3664 8162 3664 8161
TIME...MOT...LOC 1639Z 265DEG 32KT 3653 8211

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

DGS

Special weather statement, Sep 4, 1:04 PM EDT, 48 minutes before

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Local storm report, Sep 4, 1:17 PM EDT, 35 minutes before

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Local storm report, Sep 4, 1:25 PM EDT, 27 minutes before

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Local storm report, Sep 4, 1:37 PM EDT, 15 minutes before

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Local storm report, Sep 4, 1:49 PM EDT, 3 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 3, 10:56 PM EDT	Special Weather Statement	MRX	Bledsoe, Meigs, Rhea	34 min
Sep 4, 6:02 AM EDT	Areal Flood Advisory	MRX	Blount	118 min
Sep 4, 10:02 AM EDT	Special Weather Statement	MRX	Claiborne	43 min
Sep 4, 10:15 AM EDT	Severe Thunderstorm Warning	MRX	Campbell, Claiborne, Union	45 min
Sep 4, 10:58 AM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock, Hawkins	32 min
Sep 4, 11:29 AM EDT	Severe Thunderstorm Warning	MRX	Hancock, Hawkins, Sullivan	46 min
Sep 4, 11:43 AM EDT	Special Weather Statement	MRX	Grainger, Hamblen	47 min
Sep 4, 12:02 PM EDT	Severe Thunderstorm Warning	MRX	Carter, Sullivan	43 min
Sep 4, 12:09 PM EDT	Special Weather Statement	MRX	Roane	51 min
Sep 4, 12:14 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Hamblen, Hawkins	46 min
Sep 4, 12:39 PM EDT	Special Weather Statement	MRX	Johnson	51 min
Sep 4, 12:46 PM EDT	Tornado Warning	MRX	Anderson, Knox, Morgan, Roane	44 min
Sep 4, 12:51 PM EDT	Severe Thunderstorm Warning	MRX	Greene, Unicoi, Washington	39 min
Sep 4, 1:01 PM EDT	Severe Thunderstorm Warning	MRX	Greene	44 min
Sep 4, 1:04 PM EDT	Special Weather Statement	MRX	Carter	41 min
Sep 4, 1:15 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox	45 min
Sep 4, 1:22 PM EDT	Severe Thunderstorm Warning	MRX	Unicoi	38 min
Sep 4, 1:25 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Morgan, Roane	35 min
Sep 4, 1:56 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Blount, Knox	49 min
Sep 4, 2:04 PM EDT	Areal Flood Advisory	MRX	Anderson, Knox, Morgan, Roane	3 hr
Sep 4, 2:12 PM EDT	Special Weather Statement	MRX	Claiborne, Hancock	33 min
Sep 4, 2:18 PM EDT	Severe Thunderstorm Warning	MRX	Claiborne, Grainger, Hancock	42 min
Sep 4, 2:25 PM EDT	Severe Thunderstorm Warning	MRX	Sevier	50 min
Sep 4, 2:30 PM EDT	Severe Thunderstorm Warning Considerable damage threat	MRX	Blount, Knox, Sevier	45 min
Sep 4, 2:43 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Campbell, Scott	20 min
Sep 4, 2:55 PM EDT	Severe Thunderstorm Warning	MRX	Grainger, Greene, Hamblen, Hancock, Hawkins	50 min
Sep 4, 2:56 PM EDT	Severe Thunderstorm Warning	MRX	Blount, Knox	19 min
Sep 4, 3:07 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Sevier	18 min
Sep 4, 3:09 PM EDT	Severe Thunderstorm Warning	MRX	Cocke, Sevier	45 min
Sep 4, 3:35 PM EDT	Special Weather Statement	MRX	Grainger, Union	40 min
Sep 4, 3:43 PM EDT	Severe Thunderstorm Warning	MRX	Roane	47 min
Sep 4, 3:57 PM EDT	Severe Thunderstorm Warning	MRX	Anderson, Knox, Loudon, Roane	14 min
Sep 4, 4:27 PM EDT	Areal Flood Advisory	MRX	Blount, Knox, Loudon, Roane	3 hr
Sep 4, 4:31 PM EDT	Severe Thunderstorm Warning	MRX	Loudon, Roane	11 min
Sep 4, 4:36 PM EDT	Special Weather Statement	MRX	Sevier	39 min
Sep 4, 4:54 PM EDT	Special Weather Statement	MRX	Meigs, Rhea	51 min
Sep 4, 11:20 AM EDT	Special Weather Statement	MRX	Lee, Scott	40 min

Nearby

Severe Thunderstorm Warnings in Tennessee, 2025 Every severe thunderstorm warning in 2025

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.