A mesoscale convective system moved through the northern half of East Tennessee, bringing scattered reports of straight line thunderstorm wind damage.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS MRX wrote it up.
A mesoscale convective system moved through the northern half of East Tennessee, bringing scattered reports of straight line thunderstorm wind damage.
The local office's own words before the first event, 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 the first event at Aug 1, 6:56 PM EST, 59 minutes earlier.
Area Forecast Discussion
National Weather Service Morristown TN
756 PM EDT Thu Aug 1 2024
...New UPDATE, AVIATION...
.UPDATE...
Issued at 745 PM EDT Thu Aug 1 2024
MCS moving into eastern KY has produced outflow southward into
northern Tennessee with thunderstorms developing and becoming
strong to severe in the past hour on the Cumberland Plateau.
Updated forecast to increase rain chances northern Tennessee and
southwest Virginia for the next several hours. With the high
instability with MU CAPE of 2000 to 3000 J/KG and surface CAPE of
4000 J/KG storms are developing rapidly but shear is only about 20
knots. With flash flood guidance still locally high rainfall
amounts are possible this evening.
&&
.SHORT TERM...
(This evening through Friday)
Issued at 250 PM EDT Thu Aug 1 2024
Key Messages:
1. Flood Watch extended until 8 PM EDT Friday due to an active short
term period.
2. An MCS is forecast to move in from the northwest later this
evening. Localized moderate to heavy rainfall is expected along with
possible strong and gusty winds.
3. More widespread showers and storms expected tomorrow. Localized
flooding, along with strong and gusty winds remain possible with any
stronger storms.
Discussion:
Isolated showers and storms are expected to continue through this
evening. Instability is high but shear is very weak. The main threat
with any afternoon and early evening activity would be locally heavy
rainfall, though isolated damaging wind gusts remain possible.
Then, all eyes turn toward the complex of showers and storms that
developed across southern IN earlier this afternoon. This system is
expected to track east southeast and move into the northern
Cumberland Plateau around 9 PM EDT. With the mean flow east
southeast, the main bulk of this activity will remain north of I-40.
The areas most likely to be impacted will be along the TN/KY/VA
state lines. Plenty of instability will still be in place on arrival
,around 2000 J/kg. Shear will be increasing ahead of the shortwave
and will be around 20 to 30kts. This will pose a risk for isolated
damaging wind gusts as the system arrives. Moderate to locally heavy
rain is also expected. We will keep a close eye on the flooding
potential as this system moves in. This system should lose some
steam closer to midnight and become more unorganized as the
shortwave axis lifts northeast, taking the better forcing along with
it.
Additional isolated showers and storms will develop overnight and
into tomorrow morning areawide. This is in response to the upper
trough swinging into the area. Elevated instability and a still
moisture rich environment will allow our localized flooding threat
to continue. More widespread showers and storms are expected
tomorrow afternoon as the trough pushes further into the area. HREF
showing roughly 2000 to 2500 J/Kg of CAPE throughout the day with PW
values remaining elevated around 2 inches. Moderate to locally heavy
rain is expected for some areas, allowing for the flood threat to
continue. Therefore, the Flood Watch has been extended until 8 PM
EDT Friday. Isolated wind damage is also possible with any stronger
storms. Due to increased coverage of showers, storms, and cloud
cover, Heat Indices should stay in the upper 90s to low 100s across
the central and southern TN Valley.
&&
.LONG TERM...
(Friday night through next Thursday)
Issued at 250 PM EDT Thu Aug 1 2024
Key Messages:
1. Unsettled weather persists through Saturday night.
2. Slightly cooler temperatures expected over the weekend and early
part of next week.
3. Next week trending drier.
Discussion:
Abundant low level moisture in place Friday night and potential for
ongoing showers and storms to move across the region overnight
Friday. The NBM timing of the trough is slower than the
deterministic GFS and as such keeps PoPs higher on Saturday. Locally
heavy rain and gusty winds will be possible with Saturday's storms.
The ground remains very saturated and any additional rainfall could
cause localized flooding in a short period of time. With higher rain
chances and increased cloud cover, daytime temperatures on Saturday
will be slightly cooler that days past.
By Sunday, the trough axis will be east of the forecast area and a
surface cold front will gradually seep across Middle Tennessee. Some
drier air will limit rainfall chances and amounts, so most areas
should remain rain-free.
Dry conditions will persist through much of next week but
temperatures will be on a slow rise to near normal (i.e. upper 80s
to mid 90s). Heat index values will return to near 100 degrees for
the southern half of the Tennessee Valley starting Monday and
continuing through at least Wednesday.
&&
.AVIATION...
(00Z TAFS)
Issued at 745 PM EDT Thu Aug 1 2024
Mostly VFR conditions tonight but brief MVFR conditions possible
with any passing thunderstorms tonight at TRI. Have prob30 for
storms next 3 hours. The other sites are expected to stay storm
free tonight. Friday expect a chance for showers and storms in the
afternoon so included prob30 remarks for CHA and TYS and a tempo
at TRI where rain chances are higher
&&
.PRELIMINARY POINT TEMPS/POPS...
Chattanooga Airport, TN 76 94 73 91 / 10 60 40 50
Knoxville McGhee Tyson Airport, TN 75 91 71 88 / 20 70 70 70
Oak Ridge, TN 74 91 70 87 / 30 70 60 70
Tri Cities Airport, TN 71 87 68 84 / 30 70 60 80
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...Flood Watch through Friday evening for Cherokee-Clay.
TN...Flood Watch through Friday evening for Anderson-Bledsoe-Blount
Smoky Mountains-Bradley-Campbell-Claiborne-Cocke Smoky
Mountains-East Polk-Grainger-Hamblen-Hamilton-Hancock-
Hawkins-Jefferson-Johnson-Knox-Loudon-Marion-McMinn-Meigs-
Morgan-North Sevier-Northwest Blount-Northwest Carter-
Northwest Cocke-Northwest Greene-Northwest Monroe-Rhea-
Roane-Scott TN-Sequatchie-Sevier Smoky Mountains-Southeast
Carter-Southeast Greene-Southeast Monroe-Sullivan-Unicoi-
Union-Washington TN-West Polk.
Heat Advisory until 8 PM EDT /7 PM CDT/ this evening for
Anderson-Bledsoe-Bradley-Hamilton-Knox-Loudon-Marion-McMinn-
Meigs-North Sevier-Northwest Blount-Northwest Monroe-Rhea-
Roane-Sequatchie-West Polk.
VA...Flood Watch through Friday evening for Lee-Russell-Scott VA-
Washington VA-Wise.
&&
SHORT TERM...TD
LONG TERM....AC
AVIATION...TDHazardous Weather Outlook National Weather Service Morristown TN 307 PM EDT Thu Aug 1 2024 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-021915- 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- 307 PM EDT Thu Aug 1 2024 /207 PM CDT Thu Aug 1 2024/ This Hazardous Weather Outlook is for portions of southwest North Carolina...east Tennessee and southwest Virginia. .DAY ONE...This Afternoon and Tonight Additional showers and thunderstorms are expected through this evening, especially near and north of Interstate 40. Isolated damaging winds and flash flooding will be a concern with these storms. .DAYS TWO THROUGH SEVEN...Friday through Wednesday Widespread showers and storms expected again on Friday. Damaging winds and flash flooding will again be a concern with these storms. The flood watch has been extended until Friday evening. Heat index values will be around 100 degrees starting Monday and creep upwards through Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter reports of flooding and damaging winds are encouraged.
Special Weather Statement
National Weather Service Morristown TN
756 PM EDT Thu Aug 1 2024
TNZ036-067-069-020030-
Anderson TN-Roane TN-Knox TN-
756 PM EDT Thu Aug 1 2024
...A STRONG THUNDERSTORM WILL IMPACT SOUTH CENTRAL ANDERSON...
SOUTHWESTERN KNOX AND NORTHEASTERN ROANE COUNTIES THROUGH 830 PM
EDT...
At 755 PM EDT, Doppler radar was tracking a strong thunderstorm over
Oak Ridge, moving east at 20 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...
Oak Ridge, Clinton, Farragut, and Oliver Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 3587 8424 3590 8426 3590 8428 3588 8428
3589 8431 3589 8433 3588 8433 3589 8437
3600 8438 3607 8415 3585 8412
TIME...MOT...LOC 2355Z 265DEG 17KT 3594 8432
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH
KRSSpecial Weather Statement
National Weather Service Morristown TN
853 PM EDT Thu Aug 1 2024
TNZ013>015-036>038-067>069-020145-
Anderson TN-Claiborne TN-Hancock TN-Roane TN-Union TN-Loudon TN-
Campbell TN-Grainger TN-Knox TN-
853 PM EDT Thu Aug 1 2024
...STRONG THUNDERSTORMS WILL IMPACT NORTHEASTERN LOUDON...
CLAIBORNE...ANDERSON...KNOX...NORTHWESTERN HANCOCK...SOUTHEASTERN
CAMPBELL...NORTHEASTERN ROANE...UNION AND NORTHWESTERN GRAINGER
COUNTIES THROUGH 945 PM EDT...
At 852 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Harrogate to near Oak Ridge. Movement was
east at 20 mph.
HAZARD...Wind gusts up to 40 mph.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects.
Locations impacted include...
Knoxville, Oak Ridge, Clinton, Lenoir City, Alcoa, Kingston,
Maynardville, Rutledge, Farragut, and Oliver Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 3659 8324 3587 8394 3588 8403 3585 8401
3585 8405 3583 8406 3585 8408 3583 8412
3585 8413 3583 8414 3587 8454 3605 8434
3606 8436 3659 8385
TIME...MOT...LOC 0052Z 276DEG 18KT 3655 8360 3591 8429
MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH
KRSThe Knoxville radar (KMRX), 62 km away, was scanning. The volume nearest the first event began at 00:55 UTC.
9 thunderstorm wind. Local standard time, as filed.
Several trees were blown down by severe thunderstorm winds on Norris Freeway.
A few trees were blown down by powerful thunderstorm wind gusts in Maynardville.
A large tree was blown down by severe thunderstorm winds, blocking a local road.
A large tree was blown down by severe thunderstorm winds, blocking both lanes of North Campbell Station Road.
Several trees were blown down by severe thunderstorm winds east of Buffalo Springs.
A large tree and powerlines were blown down by powerful thunderstorm wind gusts just south of Interstate 40 on a local road.
Multiple trees were blown down by powerful thunderstorm wind gusts in the New Market area.
Multiple trees were blown down, including one landing on a powerline, due to severe thunderstorm wind gusts in Morristown.
A large tree was blown down at a local street corner by severe thunderstorm wind gusts.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2024Every state in 2024This day in weather historyWarnings in Tennessee, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1211295, 1211296, 1211297, 1211298, 1211299, 1211300, 1211301, 1211302, 1211303.