Alert archive / Tennessee / Flash Flood Warnings in 2025

Flash Flood Warning 51, NWS Morristown, TN

July 30, 2025Greene County, Hawkins County, Washington County, Tennessee

NWS Morristown, TN issued this flash flood warning at Jul 30, 2025, 7:30 PM EDT for Greene County, Hawkins County, Washington County, Tennessee. It was in force for 3 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: Jul 30, 2025, 7:30 PM EDT (23:30 UTC)
Expired: Jul 30, 2025, 10:48 PM EDT
In force: 3 hr
Issued by: NWS Morristown, TN
Area: Storm-based polygon
Flood severity: None

Counties Greene County, TN, Hawkins County, TN, Washington County, TN

The radar

The Knoxville radar (KMRX), 59 km from the middle of the area, began a volume at 23:33 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

Greensboro/Hi Pt, NC (KGSO), launched 12:00Z, 11.5 hours before the alert went out and 258 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: 472 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 939 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: 11 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 Jul 30, 7:20 PM EDT, 10 minutes earlier.

Area forecast discussion, Jul 30, 7:20 PM EDT, 10 minutes before

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Hazardous weather outlook, Jul 30, 1:53 PM EDT, 5 hours 37 minutes before

Hazardous Weather Outlook
National Weather Service Morristown TN
153 PM EDT Wed Jul 30 2025

NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002-
005-006-008-311800-
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-
153 PM EDT Wed Jul 30 2025 /1253 PM CDT Wed Jul 30 2025/

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

.DAY ONE...This Afternoon and Tonight

Heat Indices up to 106 degrees this afternoon across the central
Tennessee valley and southeast Tennessee. See Heat Advisory for
details.

Isolated to scattered showers and thunderstorms this afternoon.
Localized heavy rainfall and flash flooding, along with strong
gusty winds up to 50 mph, are possible with any stronger storms.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

The isolated flash flooding and strong and gusty wind threat
continues on Thursday and Friday. Both days feature increasing
POPs as a cold front advances south into our area.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not needed at this time.

In the hours before

Special weather statement, Jul 30, 5:20 PM EDT, 2 hours 10 minutes before

Special Weather Statement
National Weather Service Morristown TN
520 PM EDT Wed Jul 30 2025

TNZ036-067>069-071-073-302200-
Anderson TN-Roane TN-Loudon TN-Knox TN-North Sevier TN-NW Blount TN-
520 PM EDT Wed Jul 30 2025

...STRONG THUNDERSTORMS WILL IMPACT NORTHEASTERN LOUDON...
SOUTHEASTERN ANDERSON...KNOX...NORTHWESTERN BLOUNT AND NORTHEASTERN
ROANE COUNTIES THROUGH 600 PM EDT...

At 520 PM EDT, broadcast media reported a cluster of strong
thunderstorms 7 miles southeast of Knoxville, moving west at 10 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Broadcast media.

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

Locations impacted include...
Knoxville, Oak Ridge, Maryville, Clinton, Lenoir City, Alcoa, Loudon,
Farragut, Oliver Springs, and Louisville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3578 8435 3600 8439 3618 8393 3617 8392
      3617 8391 3616 8391 3617 8390 3617 8389
      3587 8367 3564 8411
TIME...MOT...LOC 2120Z 081DEG 8KT 3592 8382

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

19

Local storm report, Jul 30, 6:31 PM EDT, 59 minutes before

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Local storm report, Jul 30, 6:42 PM EDT, 48 minutes before

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Local storm report, Jul 30, 6:50 PM EDT, 40 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
Jul 30, 5:07 PM EDT	Areal Flood Advisory	MRX	Carter, Johnson, Sullivan	24 min
Jul 30, 5:09 PM EDT	Areal Flood Advisory	MRX	Knox	4 hr
Jul 30, 5:20 PM EDT	Special Weather Statement	MRX	Knox	40 min
Jul 30, 5:31 PM EDT	Flash Flood Warning	MRX	Sullivan	5 hr
Jul 30, 5:52 PM EDT	Areal Flood Advisory	MRX	Johnson	4 hr
Jul 30, 5:53 PM EDT	Areal Flood Advisory	MRX	Hawkins, Sullivan	20 min
Jul 30, 6:13 PM EDT	Flash Flood Warning	MRX	Hawkins, Sullivan	4 hr
Jul 30, 6:16 PM EDT	Areal Flood Advisory	MRX	Anderson, Knox	3 hr
Jul 30, 6:55 PM EDT	Areal Flood Advisory	MRX	Greene, Hawkins, Washington	35 min
Jul 30, 6:56 PM EDT	Areal Flood Advisory	MRX	Russell, Scott	3 hr

Nearby

Flash Flood Warnings in Tennessee, 2025 Every flash flood 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.