A boundary across the area triggered isolated severe thunderstorms during the afternoon and evening hours. All of the damage reports contained damaging thunderstorm winds.
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 boundary across the area triggered isolated severe thunderstorms during the afternoon and evening hours. All of the damage reports contained damaging thunderstorm winds.
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 12, 12:15 PM EST, 45 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MORRISTOWN TN
115 PM EDT THU AUG 12 2010
.AVIATION...SOME CONVECTION ALREADY STARTING TO FIRE OVER THE
AREA...SO WILL EVALUATE RIGHT BEFORE ISSUANCE IF ANY SITE NEEDS
MORE THAN A CB OR VCTS MENTION FOR THIS AFTERNOON.
OTHERWISE...MAINLY A PERSISTENCE FORECAST...WITH SOME UNCERTAINTY
ABOUT HOW MUCH VIS RESTRICTION MAY OCCUR DUE TO FOG/HAZE LATE
TONIGHT/EARLY THU. FOR NOW WILL KEEP THINGS VFR AT CHA...AND NO
LOWER THAN MVFR AT TYS AND TRI.
&&
.MRX WATCHES/WARNINGS/ADVISORIES...
NC...NONE.
TN...HEAT ADVISORY UNTIL 8 PM EDT /7 PM CDT/ THIS EVENING FOR THE
FOLLOWING ZONES: BRADLEY...HAMILTON...MARION...MCMINN...
MEIGS...RHEA...SEQUATCHIE.
VA...NONE.
&&
LDWHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 304 AM EDT THU AUG 12 2010 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-130715- 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-NW 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-RUSSELL-WASHINGTON- 304 AM EDT THU AUG 12 2010 /204 AM CDT THU AUG 12 2010/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TONIGHT ANOTHER HOT DAY IS IN STORE FOR THE SOUTHERN APPALACHIAN REGION WITH ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE. THE COMBINATION OF VERY HOT TEMPERATURES AND HIGH HUMIDITY LEVELS WILL PRODUCE HEAT INDICES BETWEEN 103 AND 108 ACROSS MUCH OF SOUTHEAST TENNESSEE. THEREFORE A HEAT ADVISORY HAS BEEN ISSUED FOR THIS REGION. HEAT INDEX VALUES WILL BE AS HIGH AS 100 TO 105 DEGREES FOR A FEW HOURS THIS AFTERNOON ACROSS THE CENTRAL TENNESSEE VALLEY. AFTERNOON SHOWERS AND THUNDERSTORMS WILL AGAIN BE POSSIBLE...WITH A FEW STORMS PRODUCING STRONG WIND GUSTS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY HOT AND HUMID CONDITIONS WILL PERSIST ON FRIDAY...ALTHOUGH THE HIGHEST HEAT INDEX READINGS SHOULD BE BETWEEN 100 TO 105. HOWEVER...THE HEAT WAVE WILL BREAK DOWN OVER THE WEEKEND AS A COOL FRONT APPROACHES THE REGION. THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL INCREASE SATURDAY INTO EARLY NEXT WEEK. THE INCREASE IN CLOUD COVER AND SCATTERED SHOWERS AND THUNDERSTORMS SHOULD HELP REDUCE HIGH TEMPERATURES SEVERAL DEGREES FROM THE RECENT OPPRESSIVE LEVELS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MORRISTOWN TN
1127 AM EDT THU AUG 12 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1145 PM TSTM WND DMG 10 NE KNOXVILLE 36.08N 83.82W
08/11/2010 KNOX TN DEPT OF HIGHWAYS
ONE TREE DOWN ON IDUMEA RD AND ONE TREE DOWN ON HOGSKIN
RD. REPORTED BY KNOX CO.HIGHWAY DEPT.
&&
GRCThe Northeast Alabama radar (KHTX), 115 km away, was scanning. The volume nearest the first event began at 17:59 UTC.
3 thunderstorm wind. Local standard time, as filed.
Highway department personnel reported 1 tree downed by thunderstorm winds on Market Street near Dayton.
Law enforcement personnel reported 1 tree on Mecca Pike and another tree on Reliance Road downed by thunderstorm winds 5 miles southwest of Tellico Plains.
Law enforcement personnel reported numerous trees downed by thunderstorm winds across the northern half of the county.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Tennessee in 2010Every state in 2010This day in weather historyWarnings in Tennessee, August 2010
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: 249943, 249949, 249957.