A boundary across the area triggered isolated severe thunderstorms during the afternoon hours. Storm reports contained large hail and 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 hours. Storm reports contained large hail and 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 27, 1:41 PM EST, 1 hour 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MORRISTOWN TN 241 PM EDT THU AUG 27 2009 .SHORT TERM...(TONIGHT AND FRIDAY)...UPPER LEVEL LOW TO OUR SOUTHWEST WILL SLOWLY LIFT NORTHEAST...AND A PIECE OF SHORT WAVE ENERGY WILL EJECT OUT AND MOVE ACROSS OUR AREA LATE TONIGHT AND EARLY FRIDAY. MOISTURE WILL BE PLENTIFUL...SO EXPECT MOST LOCATIONS WILL SEE RAIN. INSTABILITY LOOKS LIKE IT WILL BE RATHER LIMITED...BUT STILL EXPECT SOME THUNDER. WILL ALSO BE THE POTENTIAL FOR SOME VERY HEAVY RAIN...ESPECIALLY IN HIGHER TERRAIN AREAS. WILL ONLY MAKE SOME MINOR TWEAKS TO MAV TEMPS. .LONG TERM...(FRIDAY NIGHT THROUGH THURSDAY)...UNSETTLED WEATHER CAN BE EXPECTED TO CONTINUE THROUGH MOST OF THE UPCOMING WEEKEND PER MODEL AND SREF CONSENSUS. SURFACE FRONT PROJECTED TO PASS THROUGH THE SOUTHERN APPALACHIAN REGION ON SUNDAY. GENERALLY DRY WEATHER ANTICIPATED FOLLOWING FRONTAL PASSAGE THROUGH THE BALANCE OF THE LONG TERM. HAVE CONTINUED CHANCE POPS GENERALLY THROUGH SUNDAY BEFORE TAPERING OFF BY SUNDAY NIGHT. FOR TEMPS...TENDED TO FAVOR A BLEND OF GUIDANCE FOR THE WEEKEND BEFORE FOLLOWING MEX GUIDANCE CLOSELY THROUGH THE BALANCE OF THE LONG TERM PERIOD. && .PRELIMINARY POINT TEMPS/POPS... CHATTANOOGA AIRPORT, TN 68 81 66 86 64 / 70 60 30 40 50 KNOXVILLE MCGHEE TYSON AIRPORT, TN 67 79 64 85 61 / 60 70 40 40 50 OAK RIDGE, TN 67 79 64 84 60 / 60 70 40 40 50 TRI CITIES AIRPORT, TN 62 77 61 83 59 / 50 70 60 40 50 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...NONE. TN...NONE. VA...NONE. && LDW/LCM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MORRISTOWN TN 400 AM EDT THU AUG 27 2009 NCZ060-061-TNZ012>018-035>047-067>074-081>087-098>102-VAZ001-002- 005-006-008-280745- 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- 400 AM EDT THU AUG 27 2009 /300 AM CDT THU AUG 27 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...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MORRISTOWN TN 335 PM EDT THU AUG 27 2009 NCZ060-TNZ085>087-272015- CHEROKEE-MCMINN-NORTHWEST MONROE-SOUTHEAST MONROE- 335 PM EDT THU AUG 27 2009 ...A STRONG THUNDERSTORM WILL BE AFFECTING CHEROKEE...MCMINN AND MONROE COUNTIES... AT 335 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13 MILES EAST OF ETOWAH...MOVING NORTHWEST AT 5 MPH. SMALL HAIL...AND WINDS GUSTS TO AROUND 40 MPH ARE POSSIBLE 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 Knoxville radar (KMRX), 66 km away, was scanning. The volume nearest the first event began at 20:08 UTC.
1 hail, 1 thunderstorm wind. Local standard time, as filed.
Amateur radio personnel reported quarter-size hail from a thunderstorm broke the windshield on a parked police car in Alcoa.
Law enforcement personnel and the local newspaper reported several trees and powerlines downed by thunderstorm winds east of the airport from the Alcoa area to Maryville.
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: 192264, 192266.