April 27, 2011 Super Tornado Outbreak

April 27, 2011 map

April 27, 2011 Super Outbreak Tornadoes
#	Counties	Rating	Time (CST)	Length (miles)	Width (yards)	Fatalities	Injuries
1	Lauderdale AL/Wayne TN	EF1	0301	14.0	300	0	0
2	Wayne	EF1	0319	6.16	200	0	0
3	Lawrence/Maury	EF1	0350	11.14	300	0	1
4	Wilson	EF0	0422	3.04	50	0	0
5	Wilson	EF1	0423	2.04	150	0	0
6	Bedford/Rutherford/Marshall	EF1	0434	8.21	150	0	0
7	Sumner	EF0	0435	3.70	100	0	0
8	Madison AL/Lincoln TN	EF2	0436	17.80	600	0	0
9	Rutherford	EF1	0443	9.90	500	0	0
10	Rutherford	EF0	0454	4.61	100	0	0
11	Lincoln/Moore	EF1	0457	9.83	400	0	0
12	Wilson	EF0	0511	5.70	200	0	0
13	Moore/Bedford/Coffee	EF2	0512	4.47	100	0	0
14	Macon	EF0	0518	4.50	50	0	0
15	De Kalb	EF0	0519	1.52	50	0	0
16	Smith	EF0	0522	9.48	100	0	0
17	Macon TN/Clay TN/Allen KY	EF0	0527	6.32	100	0	0
18	Smith/Jackson	EF0	0531	6.79	200	0	0
19	Coffee	EF0	0536	5.15	50	0	0
20	Jackson	EF0	0538	4.66	100	0	0
21	Jackson/Clay	EF1	0541	9.89	500	0	0
22	Putnam	EF0	0541	1.29	100	0	0
23	Warren	EF1	0547	12.31	100	0	2
24	Jackson	EF0	0553	0.90	50	0	0
25	Clay	EF0	0554	1.00	50	0	0
26	Overton	EF0	0606	2.44	50	0	0
27	Cumberland	EF0	0642	5.00	100	0	0
28	Fentress	EF0	0643	2.07	50	0	0
29	Madison AL/Lincoln TN/Franklin TN	EF3	1605	16.3	440	0	0
30	Grundy	EF0	1657	0.96	50	0	0

Overview

After two days of active severe weather across Middle Tennessee on April 25 and 26, another powerful QLCS (Quasi-Linear Convective System), also known as a squall line, moved across the region during the late evening hours on April 26 into the early morning hours on April 27. This QLCS spawned at least 28 mainly weak tornadoes across Middle Tennessee, along with producing widespread wind damage and flash flooding. Thankfully, rain-cooled air from this QLCS kept the atmosphere stable across the Mid State the rest of the day, sparing Middle Tennessee from the devastating tornadoes that would strike Alabama and east Tennessee later that same afternoon and evening. Even so, two additional tornadoes occurred in Franklin and Grundy Counties during the afternoon. Data on this tornado outbreak was complied from local storm reports, NWS storm surveys, radar imagery from area WSR-88D and Terminal Doppler radars, high resolution satellite imagery, and additional research conducted by Sam Shamburger, lead forecaster at NWS Nashville.

Reports & Outlooks
SPC April 26 Storm Reports	SPC April 27 Storm Reports	SPC Event Archive
Original April 27, 2011 Webpage	All Local Storm Reports	Public Information Statements
Rainfall Totals April 26-27, 2011	Regional Tornado Track Map	NOAA 2011 Tornado Information

April 27, 2011 Links
NWS Huntsville	NWS Birmingham	NWS Morristown
NWS Memphis	NWS Jackson	NWS Atlanta

Radar
OHX Radar Base Reflectivity Loop 3AM - 8AM	OHX Radar Storm Relative Velocity Loop 3AM - 8AM