A boundary across the area triggered thunderstorms in east Tennessee during the afternoon and evening hours.  A few became severe producing large hail and damaging thunderstorm wind.

Thunderstorm Wind in LOUDON, TENNESSEE
From 25-APR-11 17:12:00 to 25-APR-11 17:25:00 (EST-5)
Location: LOUDON
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported numerous trees and powerlines downed by thunderstorm wind across the eastern half of the county.

Thunderstorm Wind in BLOUNT, TENNESSEE
From 25-APR-11 17:15:00 to 25-APR-11 17:17:00 (EST-5)
Location: (TYS)MCGHEE TYSON KN
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

A thunderstorm wind gust to 58 mph (50 knots) was measured by ASOS at McGhee Tyson Airport.

Thunderstorm Wind in KNOX, TENNESSEE
From 25-APR-11 17:30:00 to 25-APR-11 17:50:00 (EST-5)
Location: KNOXVILLE
Magnitude: 60.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio personnel reported several buildings damaged or destroyed by thunderstorm wind at the University of Tennessee hospital property in Knoxville.

Thunderstorm Wind in KNOX, TENNESSEE
From 25-APR-11 17:30:00 to 25-APR-11 17:50:00 (EST-5)
Location: KNOXVILLE
Magnitude: 60.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio personnel reported numerous trees downed by thunderstorm wind at the Martha Washington Heights subdivision in Knoxville.

Flash Flood in SULLIVAN, TENNESSEE
From 25-APR-11 17:33:00 to 25-APR-11 18:05:00 (EST-5)
Location: KINGSPORT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported Carters Valley Road flooded by heavy rain from a thunderstorm near Kingsport.

Thunderstorm Wind in KNOX, TENNESSEE
From 25-APR-11 17:45:00 to 25-APR-11 17:55:00 (EST-5)
Location: KNOXVILLE
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media personnel reported several trees downed by thunderstorm wind countywide.

Thunderstorm Wind in UNION, TENNESSEE
From 25-APR-11 18:10:00 to 25-APR-11 18:30:00 (EST-5)
Location: MAYNARDVILLE
Magnitude: 60.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported numerous trees and powerlines downed by thunderstorm wind countywide.

Thunderstorm Wind in CLAIBORNE, TENNESSEE
From 25-APR-11 18:46:00 to 25-APR-11 19:00:00 (EST-5)
Location: TAZEWELL
Magnitude: 55.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported several trees and powerlines downed by thunderstorm wind across the eastern third of the county.

Hail in WASHINGTON, TENNESSEE
From 25-APR-11 15:36:00 to 25-APR-11 15:38:00 (EST-5)
Location: TELFORD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported thunderstorms produced quarter-sized hail in Telford.

Hail in SULLIVAN, TENNESSEE
From 25-APR-11 15:45:00 to 25-APR-11 15:48:00 (EST-5)
Location: KINGSPORT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported thunderstorms produced quarter-size hail in Kingsport.

Thunderstorm Wind in WASHINGTON, TENNESSEE
From 25-APR-11 16:10:00 to 25-APR-11 16:20:00 (EST-5)
Location: JOHNSON CITY
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported a few trees and powerlines downed by thunderstorm wind near Johnson City.

Thunderstorm Wind in MONROE, TENNESSEE
From 25-APR-11 16:40:00 to 25-APR-11 16:55:00 (EST-5)
Location: MADISONVILLE
Magnitude: 55.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement personnel reported several trees downed by thunderstorm wind countywide.