A boundary across east Tennessee triggered isolated severe thunderstorms during the afternoon hours. Storm 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 east Tennessee triggered isolated severe thunderstorms during the afternoon hours. Storm 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, 6:55 PM EST, 57 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 755 PM EDT WED AUG 12 2009 .AVIATION...ISOLATED LATE AFTERNOON AND EVENING CONVECTION STILL LINGERING ABOUT AREA...ALTHOUGH SEEMS TO BE DYING OUT AROUND NORTHEAST TN AND SOUTHWEST VA. KEPT VICINITY THUNDERSTORMS AND CB IN TAFS FOR TYS AND CHA AS CONVECTION IS STILL ONGOING. FOG LOOKS TO BE FAVORABLE FOR TRI AS SKIES WILL CLEAR AND RECENT PRECIP WILL AID IN MOISTURE CONCENTRATION...SO WENT WITH IFR CONDITIONS THERE FOR LATE TONIGHT. A DRIER AIR MASS TONIGHT SHOULD KEEP FOG VISIBILITIES AT TYS IN THE MVFR RANGE...AND WILL NOT MENTION FOG AT CHA SINCE RAINFALL HAS BEEN MINIMAL THERE TODAY. && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && JCG/DMG
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 500 AM EDT WED AUG 12 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-131000- 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- 500 AM EDT WED AUG 12 2009 /400 AM CDT WED AUG 12 2009/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST NORTH CAROLINA...EAST TENNESSEE AND SOUTHWEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 601 PM EDT WED AUG 12 2009 TNZ035-036-067>069-071-122300- ANDERSON-KNOX-LOUDON-MORGAN-NW BLOUNT-ROANE- 601 PM EDT WED AUG 12 2009 ...A STRONG THUNDERSTORM WILL BE AFFECTING ANDERSON...BLOUNT... KNOX...LOUDON...MORGAN AND ROANE COUNTIES... AT 558 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING ISOLATED STRONG THUNDERSTORMS NEAR OAK RIDGE...MOVING SOUTH AT 15 MPH. WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 705 PM EDT WED AUG 12 2009 TNZ067>069-071-086-130000- KNOX-LOUDON-NORTHWEST MONROE-NW BLOUNT-ROANE- 705 PM EDT WED AUG 12 2009 ...AN AREA OF STRONG THUNDERSTORMS WILL BE AFFECTING BLOUNT...KNOX...LOUDON...MONROE AND ROANE COUNTIES... AT 702 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING AN AREA OF STRONG THUNDERSTORMS NEAR FARRAGUT AND LOUDON...MOVING SOUTH AT 10 TO 15 MPH. WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH THESE THUNDERSTORMS. MOTORISTS SHOULD BE ALERT FOR PONDING OF WATER ON ROADWAYS...AND POSSIBLE MINOR FLOODING OF LOW LYING AREAS. DO NOT DRIVE THROUGH WATERS OF UNKNOWN DEPTH. TURN AROUND DONT DROWN
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 734 PM EDT WED AUG 12 2009 TNZ067-068-083>087-100-130030- BRADLEY-LOUDON-MCMINN-MEIGS-NORTHWEST MONROE-RHEA-ROANE-SOUTHEAST MONROE- 734 PM EDT WED AUG 12 2009 ...A STRONG THUNDERSTORM WILL BE AFFECTING BRADLEY...LOUDON... MCMINN...MEIGS...MONROE...RHEA AND ROANE COUNTIES... AT 732 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR SWEETWATER...MOVING SOUTH AT 15 MPH. WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES PRIMARY KILLERS ASSOCIATED WITH THUNDERSTORMS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 809 PM EDT WED AUG 12 2009 TNZ068-083>086-099>101-130115- BRADLEY-HAMILTON-LOUDON-MCMINN-MEIGS-NORTHWEST MONROE-RHEA-WEST POLK- 809 PM EDT WED AUG 12 2009 ...AN AREA OF STRONG THUNDERSTORMS WILL BE AFFECTING NORTHERN BRADLEY...EASTERN HAMILTON...SOUTHERN LOUDON...MCMINN...SOUTHERN MEIGS...MONROE...NORTHERN POLK AND RHEA COUNTIES... AT 806 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING AN AREA OF STRONG THUNDERSTORMS NEAR DECATUR...MOVING SOUTH AT 15 MPH. WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM. IN ADDITION TO SMALL HAIL AND GUSTY WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES PRIMARY KILLERS ASSOCIATED WITH THUNDERSTORMS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. LOCALLY HEAVY RAINS...IN EXCESS OF ONE INCH PER HOUR...MAY OCCUR WITH THESE THUNDERSTORMS. MOTORISTS SHOULD BE ALERT FOR PONDING OF WATER ON ROADWAYS...AND POSSIBLE MINOR FLOODING OF LOW LYING AREAS. DO NOT DRIVE THROUGH WATERS OF UNKNOWN DEPTH. TURN AROUND DONT DROWN
The Northeast Alabama radar (KHTX), 114 km away, was scanning. The volume nearest the first event began at 00:50 UTC.
1 thunderstorm wind. Local standard time, as filed.
Law enforcement personnel reported numerous trees...traffic lights and powerlines 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 2009Every state in 2009This day in weather historyWarnings in Tennessee, August 2009
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: 192174.