Wind and Tornadoes on April 11, 2013

Event Summary for Central Alabama

A line of showers and thunderstorm moved through central Alabama during the afternoon and evening hours on April 11. During the early afternoon hours, several discrete supercells moved into central Alabama ahead of the line of storms and produced several areas of damage in west central Alabama. Once the line of storms moved into the area, several segments of the line isolated pockets of damaging winds and downed trees. By late afternoon and early evening several segments along the line of storms began to rotate in a more unstable air mass across southeastern sections of central Alabama. Additional damage occurred along the line as it moved slowly eastward.

The information contained below is the individual tornado events that occurred. The data is PRELIMINARY and may be subject to change.

 
Location/Clickable Detailed Summary Link
Damage Rating/Estimated Maximum Wind Speeds
Injuries/Fatalities
Damage Path Length/Width
Starting Point/Time
Ending Point/Time
Macedonia/Ethelsville
(Pickens County)
EF-1
100-110 mph
None
12.37 miles
1050 yards
33.2654/-88.3072
1248 pm
33.4142/-88.1995
106 pm
Mill Creek
(Walker County)
EF-1
86 mph
None
5.49 miles
500 yards
33.9197/-87.5361
245 pm
33.9628/-87.4577
251 pm
Poplar Springs
(Winston County)
EF-1
110 mph
None
2.63 miles
250 yards
34.0128/-87.4332
257 pm
34.0346/-87.3940
300 pm
Northern Smith Lake
(Winston County)
EF-1
105 mph
None
1.16 mile
300 yards
34.1421/-87.3203
310 pm
34.1590/-87.3199
313 pm
Addison
(Winston County)
EF-1
100 mph
1 Injury
0.38 miles
50 yards
34.1931/-87.1196
326 pm
34.1984/-87.1218
327 pm
Gully Creek
(Bibb County)
EF-1
90 mph
None
20.16 miles
800 yards
32.8455/-87.1709
418 pm
33.0034/-86.8788
441 pm
Notasulga
(Macon and Lee County)
EF-2
120 mph
1 Injury
5.08 miles
200 yards
32.5327/-85.7365
834 pm
32.5967/-85.6934
844 pm
 
*The Macedonia/Ethelsville EF-1 Tornado is marked with an asterisk because it was a continuation of the Kemper/Noxubee EF-3 Tornado in Mississippi, surveyed by NWS Jackson, Mississippi.  The portion of the tornado in Alabama that was surveyed by NWS Birmingham was rated EF-1.

The tornado damage "swaths" as depicted in the image above, and on the individual tornado links, are an estimate of the damage widths along the track.  In other words, the track width may not represent the actual damage in all locations, as we interpolate the values between actual surveyed damage points.  These maps are soley for the purpose of showing the general track of each tornado.  Remember, tornadoes do not always move in straight lines, and the intensity does not remain constant.  It is also possible to have other thunderstorm wind-related damage in close proximity to the tornado tracks from such features as inflow and rear flank downdrafts, which can produce tornado-like damage.
          

Pertinent Geographic Information Systems (GIS) Data from this Event

 

Other affected County Warning Areas

NWS Peachtree City, GA 

NWS Jackson, MS 

NWS Huntsville, AL 

 

Severe Weather Episode Data 

500 mb Apr 11 at 7am
500 mb Analysis
  Apr 11 at 7 am 
500 mb Apr 11 at 7 pm
  500 mb Analysis
  Apr 11 at 7 pm
Sfc Analysis Apr 11 at 7 am
Surface Analysis
  Apr 11 at 7 am
Surface Analysis Apr 11 at 7 pm
Surface Analysis
  Apr 11 at 7 pm
Day 2 Outlook 1130 am
Day 2 Severe Weather Outlook
Issued Apr 10 at 1130 am
Day 1 Outlook 7 am
Day 1 Severe Weather Outlook
Issued Apr 11 at 7 am 
JAN Upper Air Sounding Apr 11 at 7 am
JAN Upper Air Sounding Apr 11 at 7 am
BMX Sounding Apr 11 at 1 pm
BMX Upper Air Sounding Apr 11 at 1 pm

Storm Reports for April 11, 2013
Storm Reports for April 11, 2013

 

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